Sediment Database and Geochemical Assessment of Lake Pontchartrain Basin

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
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• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
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• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
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What does this data set describe?

1. How might this data set be cited?
   Manheim, Frank T., and Hayes, Laura, 2002, Sediment Database and Geochemical Assessment of Lake Pontchartrain Basin: U.S. Geological Survey Professional Paper PP-1634.

   Online Links:

   • http://pubs.usgs.gov/pp/p1634j/

   Other_Citation_Details: Chapter J
   

   This is part of the following larger work.
   Frank T. Manheim (editor), and (editor), Laura Hayes, 2002, Lake Pontchartrain Basin: bottom sediments and related environmental resources: U.S. Geological Survey Professional Paper PP-1634, U.S. Geological Survey, Reston, VA.

   Online Links:

   • http://pubs.usgs.gov/pp/p1634/

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -90.75
   East_Bounding_Coordinate: -89.25
   North_Bounding_Coordinate: 30.42
   South_Bounding_Coordinate: 29.75
   

3. What does it look like?

   http://pubs.usgs.gov/pp/p1634j/images/headmap.gif (GIF)

   Labeled map of station locations with inset showing general area of the study, 597x385 pixels, 29k bytes

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 1963

   Ending_Date: 1998

   Currentness_Reference:

   sample collection period

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: tabular digital data
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Entity point (1593)
   2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.
      
7. How does the data set describe geographic features?

   Station

   table in the database

   UNIQUE_ID

   Database ID unique to this specific sample; assigned by USGS; used to link data between tables

   Range of values
   Minimum:	1
   Maximum:	2811

   ORIGNL_ID

   If this data is taken from a previous data compilation, enter the unique ID NUMBER within the other database that refers to this data. See ORIG_STATN for original station name. This is a complex text containing sample identification codes. Frequently several codes are given in each field, separated by commas. Several different sample identification schemes are represented among the samples.

   ORIGL_FILE

   Database file name from which this specific sample came (see ORIG_DB_NM for name of entire database)

   Value	Definition
   "SED_CHEM, SEDGRAIN"
   (empty)

   LATITUDE

   Latitude in decimal-degrees (south latitudes are negative)

   Value	Definition
   (empty)

   Range of values
   Minimum:	29.2
   Maximum:	30.37343245
   Units:	decimal degrees

   LAT_DEG_N

   degrees of latitude in whole degrees (if originally reported that way)

   Value	Definition
   (empty)

   Range of values
   Minimum:	29
   Maximum:	30
   Units:	degrees of arc
   Resolution:	1

   LAT_MIN_N

   minutes of latitude in whole or decimal units (if originally reported that way)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	59
   Units:	minutes of arc
   Resolution:	1

   LAT_SEC_N

   seconds of latitude in whole or decimal units (if originally reported that way)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	59
   Units:	arc-seconds
   Resolution:	1

   LAT_ORIG

   format and precision of originally recorded latitude (indicate format and significant digits, e.g.. ddmmss.s; dd.dddd)

   Value	Definition
   ddmm.mm	degrees and decimal minutes, to 0.01 minutes
   ddmm.mmm	degrees and decimal minutes, to 0.001 minutes
   ddmmss	degrees, minutes, and seconds
   (empty)	Location specified in the original report as decimal degrees

   LONGITUDE

   Longitude in decimal-degrees (West longitude is depicted by negative values.)

   Value	Definition
   (empty)

   Range of values
   Minimum:	-88.67
   Maximum:	-92.76417
   Units:	decimal degrees
   Resolution:	0.000001

   LON_DEG_W

   degrees of longitude (West) in whole degrees (if originally reported that way)

   Value	Definition
   -90	probably supposed to be 90 degrees W
   (empty)

   Range of values
   Minimum:	88
   Maximum:	92
   Units:	degrees of arc
   Resolution:	1

   LON_MIN_W

   minutes of longitude (West) in whole or decimal minutes (if originally reported that way)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	59
   Units:	minutes of arc
   Resolution:	1

   LON_SEC_W

   seconds of longitude (West) in whole or decimal units (if originally reported that way)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	59
   Units:	arc-seconds
   Resolution:	1

   LON_ORIG

   format and precision of originally recorded longitude (west), eg. ddmmss.s; dd.dddd; ffffff

   Value	Definition
   ddmm.mm	degrees and decimal minutes, to 0.01 minutes
   ddmm.mmm	degrees and decimal minutes, to 0.001 minutes
   ddmmss	degrees, minutes, and seconds
   (empty)	Location specified in the original report as decimal degrees

   ORIG_LOC

   Original location if given in units other than latitude and longitude (e.g., State Plane or distance from a point) Most values contain two numbers that cannot be latitude and longitude, two contain descriptive textual information.

   NAV_MODE

   Navigational system used, e.g. LORAN C, GPS, triangulation, read from a sketch map

   Value	Definition
   "the LORAN C coordinates in fields 8 & 13 were e-mailed to AGM by G.Flowers on 4-28-97. the coordinates in fields 7 & 12 were calculated by AGM from a faxed copy of figure 1 of Sarkar's thesis (see file""SSCONVERT.DOC"" for full details)"
   (empty)	not known

   SOUNDING_M

   Measured depth of water overlying sediment at sample time, in meters

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	14
   Units:	meters
   Resolution:	1

   SNDNG_ORIG

   Measured depth of water overlying sediment at sample time, in original units if other than meters

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	26

   SNDG_UNITS

   Depth units for SNDG_ORIG (meters, feet, fathoms, etc.)

   Value	Definition
   feet
   ft	feet
   (empty)

   AGNC1_SPON

   Agency or researcher sponsoring or publishing the work, see listing for abbreviations

   Value	Definition
   LDEQ	Louisiana Department of Environmental Quality
   LDEQ-OWR-WPCD	Louisiana Department of Environmental Quality - Office of Water Resources - Water Pollution Control Division
   LDNR-CZMD	Louisiana Department of Natural Resources - Coastal Zone Management Division
   LSU	Louisiana State University
   UNO	University of New Orleans
   USEPA	United States Environmental Protection Agency
   USACE	United States Army Corps of Engineers
   USGS	United States Geological Survey
   USGS - WRD	United States Geological Survey - Water Resources Division

   SRCE_OR_RF

   Source of information, or reference (usually authors and year) Attribute values are the source citation abbreviations given in the Lineage of this report; each refers to the corresponding data source.

   COM_ON_REF

   Any comments about reference from which data was entered self-explanatory text

   ORIG_DB_NM

   If this data is taken from another data compilation or database, enter the NAME of that database here.

   Value	Definition
   "EMAP-Estuaries Province Level Database, Louisianian Province 1991-1994"
   (empty)

   PROJ_NAME

   ID when data source/study is part of a larger study or of a regulatory action

   Value	Definition
   EMAP	Environmental Monitoring and Assessment Program

   STATE_NAME

   Name of state encompassing sample location

   Value	Definition
   Louisiana
   (empty)	information not provided

   GEN_LOC_NM

   General location name (enough to easily locate on a state map) Common name given as text.

   SPECFC_LOC

   Specific location (nearest name on a 1:25,000 NOAA-type Chart) Self-explanatory text describing geographic location with reference to named places.

   AREA_CODE

   An alphabetical code created to identify approximate sample location for data analysis. Codes correspond to areas within the lakes and waterways. For further information, see http://pubs.usgs.gov/pp/p1634j/html/area_cd.htm

   Value	Definition
   BLaBr	Bayou LaBranche
   BretS	Breton Sound
   BTrep	Bayou Trepagnier
   CMent	Chef Menteur
   EngCa	Engineers Canal
   ICW	Intracoastal Waterway
   IHNC	Inner Harbor Navigation Canal
   LBorg	Lake Borgne
   LMaur	Lake Maurepas
   LP	Lake Pontchartrain
   LP-BC	Lake Pontchartrain, Bonnet Carre Region
   LP-CE	Lake Pontchartrain, central region east of Causeway
   LP-CW	Lake Pontchartrain, central region west of Causeway
   LP-NO	Lake Pontchartrain, New Orleans region
   LP-NS	Lake Pontchartrain, north shore region
   LP-PH	Lake Pontchartrain, Pointe aux Herbes region
   LP-RG	Lake Pontchartrain, Rigolets region
   LP-WS	Lake Pontchartrain, west shore region
   MissB	Mississippi Bayou
   MRGO	Mississippi River Gulf Outlet
   Rigol	Rigolets

   AREA_CD_SQ

   A numerical code derived from an index grid used in analysis. This index provides a convenient way to search or sort data from specific localities covered by the database. Each grid square is approx 7.5 sq-km. For further information, see http://pubs.usgs.gov/pp/p1634j/html/area_cd2.htm

   Value	Definition
   (empty)

   Range of values
   Minimum:	1
   Maximum:	88

   LOC_CMMNTS

   Any additional information pertinent to sample location (e.g., exposed mud flat, ) and any correction made to previously recorded locations Self-explanatory text.

   SAMP_DAY1

   Day of the month sample collected from the natural environment began

   Value	Definition
   (empty)

   Range of values
   Minimum:	1
   Maximum:	31
   Units:	day
   Resolution:	1

   MO1

   Month sample collected from the natural environment began

   Value	Definition
   1	January
   2	February
   3	March
   4	April
   5	May
   6	June
   7	July
   8	August
   9	September
   10	October
   11	November
   12	December
   (empty)	date not specified

   YEAR1

   Year sample collected from the natural environment began

   Value	Definition
   (empty)

   Range of values
   Minimum:	1972
   Maximum:	1998
   Units:	year
   Resolution:	1

   TO_SMP_DA2

   Ending day sample collected from the natural environment finished

   Value	Definition
   23	23rd day of the month?
   (empty)

   MO2

   Ending month sample collected from the natural environment finished

   Value	Definition
   6	June
   10	October
   (empty)	date not specified

   YEAR2

   Ending year sample collected from the natural environment finished

   Value	Definition
   (empty)

   Range of values
   Minimum:	1980
   Maximum:	1984
   Units:	year
   Resolution:	1

   DATE_Q

   Qualifier for date

   Value	Definition
   No date stated for sediment analysis
   (empty)

   HOUR1

   Hour sample collected from natural environment

   Value	Definition
   (empty)

   Range of values
   Minimum:	11
   Maximum:	13
   Units:	hour of day
   Resolution:	1

   MIN1

   Minute sample collected from natural environment

   Value	Definition
   (empty)	time not available

   Range of values
   Minimum:	0
   Maximum:	55
   Units:	minutes
   Resolution:	1

   SAMP_DATE1

   Use with caution. Date that sample collection began (Example: Month-Year, or Month-Day-Year) This is a combination of SAMP_DAY1, MO1 and YEAR1. Note that formatted dates are subject to manipulation by computer software. Dates are given as dd/mm/yy where dd and mm may consist of only one digit.

   TO_SMP_DT2

   Use with caution. Date that sample collection was completed (Example: Month-Year, or Month-Day-Year) This is a combination of TO_SMP_DA2, MO2 and YEAR2. Note that formatted dates are subject to manipulation by computer software.

   Value	Definition
   6/1/80	June 1, 1980
   10/23/84	October 23, 1984
   (empty)

   ORIG_STATN

   Name or number of station at which sample collected Many of the values are integer numbers, but some are codes with letters and numbers, or comments.

   SMPLNG_DEV

   Device used to collect the sample

   Value	Definition
   """a coring device"""
   "0.1 m^2 box corer, subsampled using a 4.25 inch polycarbonate core liner"
   Box corer
   Eckman mechanical grab sampler
   Peterson dredge
   Petite ponar
   Petite Ponar dredge
   Petite ponar dredge
   Petite ponar grab
   piston corer
   scoop sampler
   spade corer
   unknown
   unknown corer
   Van Veen Grab
   Vibracore
   (empty)

   SAMPL_TYPE

   Materials in sample analyzed (in current database, each sample is sediment)

   Value	Definition
   none	not available
   sediment	sediment sample

   DPTH_N_COR

   The depth of the sample in the sediment if only one number is given, or words if no numerical value is given (e.g., 2 cm; surface) in units of cm Many of the fields contain a number, but some contain comments such as "bottom" or a depth range indicated by two numbers separated by a hyphen. Some fields contain units as well. Some fields are empty.

   CORE_LENGT

   Text field showing the total length of the core and its units. Note that the units are not standardized. Values contain a number followed by "m" (meters) or "inches". Some lack units.

   DEPTH_TOP

   Depth interval, TOP of Core or sample (cm)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	144
   Units:	centimeters
   Resolution:	1

   DEPTH_BTTM

   Depth interval, BOTTOM of Core or sample (cm)

   Value	Definition
   (empty)

   Range of values
   Minimum:	7
   Maximum:	505
   Units:	centimeters
   Resolution:	1

   ORIG_UNITS

   The original units of the depth of the sample in the sediment when not centimeters

   Value	Definition
   inches
   (empty)

   DPTH_CODE

   Code designating the general depth in the sediment of the sample, e.g., surface, core. Data in this field is derived from other fields and is primarily for use in data analysis.

   Value	Definition
   Core
   Surface
   Surface of core
   (empty)

   COMPS_SCHM

   Describe how sample was combined if analysis was done on composite of samples taken from differing depths or cores

   Value	Definition
   """Three samples were taken at each location and homogenized by mixing using plastic utensils."""
   sample is a homogenate composed of the surficial 2 cm from several grabs (see methods field in grain size table for additional comments)
   (empty)	sample not combined with others

   GEN_CMMNTS

   Any additional information that may help in interpreting data, locating sample in a series, or characterizing sample

   Value	Definition
   BASE	Stations that were randomly selected based on EMAP sampling design (grid).
   INDEX	Stations that were paired with small estuary and tidal river base sites. They were intended to represent the area of sediment deposition with the estuary or river. Not random.
   ITE	Indicator Testing and Evaluation Sites - only for 1991. Selected specifically to test indicators' ability to discriminate between degraded and reference sites.
   SUPPL	Stations that were randomly selected by using the EMAP grid design and reducing it to fit within a single estuary.
   QA/QC	The replicate sampling of a base station (exact location) within a short time span. (Collection methods quality reference.)
   REP-91	Between-year replicates of 1991 base sites. These 1991 sites were sampled every year to represent variation and long term trends. (No within-year replicates, see next definition.)
   REP-9?	Randomly selected sites that are "near-by" to one another to evaluate variability within a given area (for example, within a hexagon or small estuary). Used to test the EMAP design.
   VARIANCE	Trend sites selected to evaluate variation and long term trends (selected in addition to the REP-91 sites).

   DESCRIPTN

   Any text describing the sample's appearance This is a long text field intended to be self-explanatory.

   EST_VL_MAT

   Volume of material to be dredged and needing disposal when sample is from a dredge permit application

   Value	Definition
   """at least 200cc"
   (empty)

   MTS_INGNCS

   Y/N answer to indicate whether data for metals and other inorganic parameters are present elsewhere in this database; occasionally contains additional information.

   Value	Definition
   n	no
   no; see Byrne	qualified no
   y	yes
   (empty)

   ORG_CNTAMS

   Y/N answer to indicate whether Organic Contaminants data are present elsewhere in this database; occasionally contains additional information.

   Value	Definition
   n	no
   no: see McFall et al	qualified no
   y	yes
   (empty)

   GRAIN_SIZE

   Y/N answer to indicate whether Grain Size or related physical properties are present elsewhere in this database; occasionally contains additional information.

   Value	Definition
   n	no
   y	yes
   (empty)

   BIOASSAY

   Y/N answer to indicate whether Bioassay data were collected in conjunction with collection of the sediment sample recorded in this database

   Value	Definition
   n	bioassay data not collected
   y	bioassay data were collected
   (empty)

   OTHR_N_REF

   Whether any other types of analysis are documented in the reference but not recorded in this database

   Value	Definition
   n	no other analyses were found
   y	additional analyses were found
   (empty)	we do not know whether other analyses are documented in the reference

   CMNTS_OTHR

   Brief summary of any other types of analysis documented in the reference but not recorded in this database

   Value	Definition
   "6 water microbiology parameters, 5 sediment microbiological parameters, benthic invertebrate analysis, 60 species of fish collected"
   "Toxicity Test Data, Water Quality Vertical Profile, Benthic Data, Fish/Invertebrate Data"
   benthic fauna counts
   (empty)

   DTA_ENT_DA

   Day that data was entered into the database table

   Value	Definition
   (empty)

   Range of values
   Minimum:	4
   Maximum:	31
   Units:	day of the month
   Resolution:	1

   DTA_ENT_MO

   Month that data was entered into the database table

   Value	Definition
   1	January
   2	February
   4	April
   5	May
   8	August
   9	September
   10	October
   11	November
   12	December

   DTA_ENT_YR

   Year that data was entered into the database table

   Range of values
   Minimum:	1996
   Maximum:	2000
   Units:	year
   Resolution:	1

   ENTRY_DATE

   Date (formatted) that data was entered into the database table Dates are given as dd/mm/yy where dd and mm may consist of only one digit.

   INIT_NTRER

   Initials of the person who entered the data from the original reference or source into the database, see working dictionary for abbreviations

   Value	Definition
   agm	Andrew G. McIntire
   LH	Laura Hayes

   Inorganic

   table in the database

   UNIQUE_ID

   Database ID unique to this specific sample; assigned by USGS; used to link data between tables

   ANAL_TECH

   Method used for analysis of each metal

   COMMENT1

   Any further information about analysis for all or specific metals

   AG_UG_G

   Concentration of Silver (Ag) in the sample in units of µg/g.

   AG_Q

   Any qualifier information or comments about the Silver concentration; e.g. ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g

   Value	Definition
   <DL	Less than detection limit. (Concentration reads "0" because the measurement fell below the detection limit).
   DV	Discriminant value (For discussion of discriminant functions see Analytical Methods and Quality Control).
   DVS	25% of samples for this component and source show unresolved anomalies in discriminant values.
   HA	High Alert (see table 8 for alert levels).
   LA	Low Alert (see table 8 for alert levels).
   Leach	Leachate method was used for metal analysis. Values resulting from this type of analysis have valid uses but are not comparable to those resulting from total dissolution methods. See Discussion and Inorganic Chemistry sections for more explanation.
   LW	Source reports data on a wet-weight basis, which gives lower apparent values than dry-weight basis. mean (n = *) Multiple samples were collected from the same location and analyzed; the value reported is the mean (n = number of replicates).
   ND	Not detected.
   Repl. DL	A replicate value is below detection limit (the value reported is the mean of the others).
   W	Warning: unresolved questions (no quality-control corroboration or causal relationships for anomalous data are available).

   AG_DL

   The lowest detectable concentration of Silver for this laboratory and this methodology.

   AL_UG_G

   Concentration of Aluminum ( Al) in the sample in units of µg/g (micrograms per gram).

   AL_Q

   Any qualifier information or comments about the Aluminum concentration; e.g. ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g

   AL_DL

   The lowest detectable concentration of Aluminum for this laboratory and this methodology.

   AS_UG_G

   Concentration of Arsenic (As) in the sample in units of µg/g.

   AS_Q

   Any qualifier information or comments about the As concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g.

   AS_DL

   The lowest detectable concentration of As for this laboratory and this methodology.

   BA_UG_G

   Concentration of Barium (Ba) in the sample in units of µg/g.

   BA_Q

   Any qualifier information or comments about the Ba concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value in units if not µg/g.

   BA_DL

   The lowest detectable concentration of Ba for this laboratory and this methodology.

   BE_UG_G

   Concentration of Beryllium (Be) in the sample in units of µg/g.

   BE_Q

   Any qualifier information or comments about the Be concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g.

   BE_DL

   The lowest detectable concentration of Be for this laboratory and this methodology.

   BI_UG_G

   Concentration of Bismuth (Bi) in the sample in units of µg/g.

   BI_Q

   Any qualifier information or comments about the Bi concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g.

   BI_DL

   The lowest detectable concentration of Bi for this laboratory and this methodology.

   CA_UG_G

   Concentration of Calcium (Ca) in the sample in units of µg/g.

   CA_Q

   Any qualifier information or comments about the Ca concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g.

   CA_DL

   The lowest detectable concentration of Ca for this laboratory and this methodology.

   CD_UG_G

   Concentration of Cadmium (Cd) in the sample in units of µg/g.

   CD_Q

   Any qualifier information or comments about the Cd concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g

   CD_DL

   The lowest detectable concentration of Cd for this laboratory and this methodology.

   CO_UG_G

   Concentration of Cobalt (Co) in the sample in units of µg/g.

   CO_Q

   Any qualifier information or comments about the Co concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g.

   CO_DL

   The lowest detectable concentration of Co for this laboratory and this methodology.

   CR_UG_G

   Concentration of Chromium (Cr) in the sample in units of µg/g.

   CR_Q

   Any qualifier information or comments about the Cr concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc. Original value and units if not µg/g

   CR_DL

   The lowest detectable concentration of Cr for this laboratory and this methodology.

   CU_UG_G

   Concentration of Copper (Cu) in the sample in units of µg/g.

   CU_Q

   Any qualifier information or comments about the Cu concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   CU_DL

   The lowest detectable concentration of Cu for this laboratory and this methodology.

   FE_UG_G

   Concentration of Iron (Fe) in the sample in units of µg/g.

   FE_Q

   Any qualifier information or comments about the Fe concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   FE_DL

   The lowest detectable concentration of Fe for this laboratory and this methodology.

   HG_UG_G

   Concentration of Mercury (Hg) in the sample in units of µg/g.

   HG_Q

   Any qualifier information or comments about the Hg concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   HG_DL

   The lowest detectable concentration of Hg for this laboratory and this methodology.

   K_UG_G

   Concentration of Potassium (K) in the sample in units of µg/g.

   K_Q

   Any qualifier information or comments about the K concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   K_DL

   The lowest detectable concentration of K for this laboratory and this methodology.

   MG_UG_G

   Concentration of Magnesium (Mg) in the sample in units of µg/g.

   MG_Q

   Any qualifier information or comments about the Mg concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   MG_DL

   The lowest detectable concentration of Mg for this laboratory and this methodology.

   MN_UG_G

   Concentration of Manganese (Mn) in the sample in units of µg/g.

   MN_Q

   Any qualifier information or comments about the Mn concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   MN_DL

   The lowest detectable concentration of Mn for this laboratory and this methodology.

   MO_UG_G

   Concentration of Molybdenum (Mo) in the sample in units of µg/g.

   MO_Q

   Any qualifier information or comments about the Mo concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   MO_DL

   The lowest detectable concentration of Mo for this laboratory and this methodology.

   NA_UG_G

   Concentration of Sodium (Na) in the sample in units of µg/g.

   NA_Q

   Any qualifier information or comments about the Na concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   NA_DL

   The lowest detectable concentration of Na for this laboratory and this methodology.

   NI_UG_G

   Concentration of Nickel (Ni) in the sample in units of µg/g.

   NI_Q

   Any qualifier information or comments about the Ni concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   NI_DL

   The lowest detectable concentration of Ni for this laboratory and this methodology.

   P_UG_G

   Concentration of phosphorus (P) in the sample in units of µg/g.

   P_Q

   Any qualifier information or comments about the P concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   P_DL

   The lowest detectable concentration of P for this laboratory and this methodology.

   P_ORTHO_C

   Phosphorus ortho in units of µg/g

   P_ORTHO_Q

   Phosphorus ortho qualifier

   P_ORTHO_D

   Phosphorus ortho detection limit

   PB_UG_G

   Concentration of Lead (Pb) in the sample in units of µg/g.

   PB_Q

   Any qualifier information or comments about the Pb concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   PB_DL

   The lowest detectable concentration of Pb for this laboratory and this methodology.

   SB_UG_G

   Concentration of Antimony (Sb) in the sample in units of µg/g.

   SB_Q

   Any qualifier information or comments about the Sb concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   SB_DL

   The lowest detectable concentration of Sb for this laboratory and this methodology.

   SC_UG_G

   Concentration of Scandium (Sc) in the sample in units of µg/g.

   SC_Q

   Any qualifier information or comments about the Sc concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   SC_DL

   The lowest detectable concentration of Sc for this laboratory and this methodology.

   SE_UG_G

   Concentration of Selenium (Se) in the sample in units of µg/g.

   SE_Q

   Any qualifier information or comments about the Se concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   SE_DL

   The lowest detectable concentration of Se for this laboratory and this methodology.

   SN_UG_G

   Concentration of Tin (Sn) in the sample in units of µg/g.

   SN_Q

   Any qualifier information or comments about the Sn concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   SN_DL

   The lowest detectable concentration of Sn for this laboratory and this methodology.

   SR_UG_G

   Concentration of Strontium (Sr) in the sample in units of µg/g.

   SR_Q

   Any qualifier information or comments about the Sr concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   SR_DL

   The lowest detectable concentration of Sr for this laboratory and this methodology.

   TI_UG_G

   Concentration of Titanium (Ti) in the sample in units of µg/g.

   TI_Q

   Any qualifier information or comments about the Ti concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   TI_DL

   The lowest detectable concentration of Ti for this laboratory and this methodology.

   TL_UG_G

   Concentration of Thallium (Tl) in the sample in units of µg/g.

   TL_Q

   Any qualifier information or comments about the Tl concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   TL_DL

   The lowest detectable concentration of Tl for this laboratory and this methodology.

   V_UG_G

   Concentration of Vanadium (V) in the sample in units of µg/g.

   V_Q

   Any qualifier information or comments about the V concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   V_DL

   The lowest detectable concentration of V for this laboratory and this methodology.

   W_UG_G

   Concentration of Tungsten (W) in the sample in units of µg/g.

   W_Q

   Any qualifier information or comments about the W concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   W_DL

   The lowest detectable concentration of W for this laboratory and this methodology.

   Y_UG_G

   Concentration of Yttrium (Y) in the sample in units of µg/g.

   Y_Q

   Any qualifier information or comments about the Y concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   Y_DL

   The lowest detectable concentration of Y for this laboratory and this methodology.

   ZN_UG_G

   Concentration of Zinc (Zn) in the sample in units of µg/g.

   ZN_Q

   Any qualifier information or comments about the Zn concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   ZN_DL

   The lowest detectable concentration of Zn for this laboratory and this methodology.

   ZR_UG_G

   Concentration of Zirconium (Zr) in the sample in units of µg/g.

   ZR_Q

   Any qualifier information or comments about the Zr concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   ZR_DL

   The lowest detectable concentration of Zr for this laboratory and this methodology.

   C_CO3_PCT

   Concentration of Carbon (carbonate) in the sample in units of %. Do not enter the detection limit here.

   C_CO3_Q

   Any qualifier information or comments about the Carbon (carbonate) concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   C_CO3_DL

   The lowest detectable concentration of Carbon(carbonate) for this laboratory and this methodology.

   C_ORG_PCT

   Concentration of organic carbon (Corg) in the sample in units of %Corg.

   C_ORG_Q

   Any qualifier information or comments about the organic carbon concentrations; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; etc.

   C_ORG_DL

   The lowest detectable concentration of organic carbon for this laboratory and this methodology.

   C_TOT_PCT

   Concentration of total carbon (Ctot) in the sample in units of %Ctot. Ctot= Cinorg+Corg unless Ctot was measured instead of calculated.

   NO3_UG_G_N

   Concentration of Nitrate (NO3) in the sample in units of ug/g as N.

   NO3_Q

   Any qualifier information or comments about the NO3 concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; original value and units if not µg/g; etc.

   NO3_DL

   The lowest detectable concentration of Nitrate for this laboratory and this methodology.

   NO2_UG_G_N

   Concentration of Nitrite (NO2) in the sample in units of ug/g as N.

   NO2_Q

   Any qualifier information or comments about the NO2 concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; original value and units if not µg/g; etc.

   AVS_MOL_G

   Concentration of sulfur (as SO2) present that is acid volatile (AVS) in the sample in units of moles/gram..

   AVS_Q

   Any qualifier information or comments about the AVS concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; original value and units if not µg/g; etc.

   WATER_WPCT

   Percent of total wet sample weight that is water, i.e., (total wt-dry wt/wet wt)*100. If porosity (volume fraction) values are given, note units in grams.

   General Organics

   table in the database

   UNIQUE_ID

   Database ID unique to this specific sample; assigned by USGS; used to link data between tables

   PHCTOT_PPM

   Concentration of measured Total Petroleum Hydrocarbons (PHC) in units of ppm. Do not derive by summation.

   PHC_Q

   Any qualifier information or comments about the PHC concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; concentration given in other units etc.

   PHC_D

   The lowest detectable concentration of PHC for this laboratory and this methodology.

   PCBTOT_UGG

   Concentration of measured total of polychlorinated biphenyls (PCB) in units of µg/g

   PCB_Q

   Any qualifier information or comments about the PCB concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; concentration given in other units etc.

   PCB_D

   The lowest detectable concentration of PCB for this laboratory and this methodology.

   DDT_(T)_C

   Concentration of measured total of DDT compounds in units of µg/g

   DDT_(T)_Q

   Any qualifier information or comments about the DDT concentration; e.g., ""less than"" (< or lt); analytical trouble with this sample; corrections made during VALIDS; indications of poor quality data; concentration given in other units etc.

   DDT_(T)_D

   The lowest detectable concentration of DDT for this laboratory and this methodology.

   DDE_(T)_C

   Concentration of DDE total (DDT degradation product ) in units of parts per billion

   DDE_(T)_Q

   Any qualifier information or comments about DDE total e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDE_(T)_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DDD_(T)_C

   Concentration of DDD (DDT derivative of metabolite) in units of parts per billion

   DDD_(T)_Q

   Any qualifier information or comments about DDD total - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDD_(T)_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   Specific Organics A (PCBs/Pesticides)

   table in the database

   UNIQUE_ID

   Database ID unique to this specific sample; assigned by USGS; used to link data between tables

   PCB_8_PPB

   PCB congener # 8 of 209 possible in units of parts per billion 2,4'-DICHLOROBIPHENYL

   PCB_8_Q

   Qualifier concerning PCB congener #8

   PCB_8_D

   The lowest detectable concentration of PCB congener #8 of 209 for this laboratory and methodology.

   PCB_18_PPB

   PCB congener # 18 of 209 possible in units of parts per billion 2,2',5-TRICHLOROBIPHENYL

   PCB_18_Q

   Qualifier concerning PCB congener #18

   PCB_18_D

   The lowest detectable concentration of PCB congener #18 of 209 for this laboratory and methodology.

   PCB_28_PPB

   PCB congener # 28 of 209 possible in units of parts per billion 2,4,4'-TRICHLOROBIPHENYL

   PCB_28_Q

   Qualifier concerning PCB congener #28

   PCB_28_D

   The lowest detectable concentration of PCB congener #28 of 209 for this laboratory and methodology.

   PCB_29_PPB

   PCB congener # 29 of 209 possible in units of parts per billion 2,4,5-TRICHLOROBIPHENYL

   PCB_29_Q

   Qualifier concerning PCB congener #29

   PCB_29_D

   The lowest detectable concentration of PCB congener #29 of 209 for this laboratory and methodology.

   PCB_44_PPB

   PCB congener # 44 of 209 possible in units of parts per billion 2,2',3,5'-TETRACHLOROBIPHENYL

   PCB_44_Q

   Qualifier concerning PCB congener #44

   PCB_44_D

   The lowest detectable concentration of PCB congener #44 of 209 for this laboratory and methodology.

   PCB_52_PPB

   PCB congener # 52 of 209 possible in units of parts per billion 2,2',5,5'-TETRACHLOROBIPHENYL

   PCB_52_Q

   Qualifier concerning PCB congener #52

   PCB_52_D

   The lowest detectable concentration of PCB congener #52 of 209 for this laboratory and methodology.

   PCB_66_PPB

   PCB congener # 66 of 209 possible in units of parts per billion 2,3',4,4'-TETRACHLOROBIPHENYL

   PCB_66_Q

   Qualifier concerning PCB congener #66

   PCB_66_D

   The lowest detectable concentration of PCB congener #66 of 209 for this laboratory and methodology.

   PCB_77_PPB

   PCB congener # 77/110 of 209 possible in units of parts per billion 3,3',4,4'-TETRACHLOROBIPHENYL

   PCB_77_Q

   Qualifier concerning PCB congener #77/110

   PCB_77_D

   The lowest detectable concentration of PCB congener #77/110 of 209 for this laboratory and methodology.

   PCB_87_PPB

   PCB congener # 87 of 209 possible in units of parts per billion 2,2',3,4,5'-PENTACHLOROBIPHENYL

   PCB_87_Q

   Qualifier concerning PCB congener #87

   PCB_87_D

   The lowest detectable concentration of PCB congener #78 of 209 for this laboratory and methodology.

   PCB101_PPB

   PCB congener # 101 of 209 possible in units of parts per billion 2,2',4,5,5'-PENTACHLOROBIPHENYL

   PCB_101_Q

   Qualifier concerning PCB congener #101

   PCB_101_D

   The lowest detectable concentration of PCB congener #101 of 209 for this laboratory and methodology.

   PCB105_PPB

   PCB congener # 105 of 209 possible in units of parts per billion 2,3,3',4,4'-PENTACHLOROBIPHENYL

   PCB_105_Q

   Qualifier concerning PCB congener #105

   PCB_105_D

   The lowest detectable concentration of PCB congener #105 of 209 for this laboratory and methodology.

   PCB118_PPB

   PCB congener # 118 of 209 possible in units of parts per billion 2,3',4,4',5-PENTACHLOROBIPHENYL

   PCB_118_Q

   Qualifier concerning PCB congener #118

   PCB_118_D

   The lowest detectable concentration of PCB congener #118 of 209 for this laboratory and methodology.

   PCB126_PPB

   PCB congener # 126 of 209 possible in units of parts per billion 3,3',4,4',5-PENTACHLOROBIPHENYL

   PCB126_Q

   Qualifier concerning PCB congener #126

   PCB126_D

   The lowest detectable concentration of PCB congener #126 of 209 for this laboratory and methodology.

   PCB128_PPB

   PCB congener # 128 of 209 possible in units of parts per billion 2,2',3,3',4,4'-HEXACHLOROBIPHENYL

   PCB_128_Q

   Qualifier concerning PCB congener #128

   PCB_128_D

   The lowest detectable concentration of PCB congener #128 of 209 for this laboratory and methodology.

   PCB138_PPB

   PCB congener # 138 of 209 possible in units of parts per billion 2,2',3,4,4',5'-HEXACHLOROBIPHENYL

   PCB_138_Q

   Qualifier concerning PCB congener #138

   PCB_138_D

   The lowest detectable concentration of PCB congener #138 of 209 for this laboratory and methodology.

   PCB153_PPB

   PCB congener # 153 of 209 possible in units of parts per billion 2,2',4,4',5,5'-HEXACHLOROBIPHENYL

   PCB_153_Q

   Qualifier concerning PCB congener #153

   PCB_153_D

   The lowest detectable concentration of PCB congener #153 of 209 for this laboratory and methodology.

   PCB170_PPB

   PCB congener # 170 of 209 possible in units of parts per billion 2,2',3,3',4,4',5-HEPTACHLOROBIPHENYL

   PCB_170_Q

   Qualifier concerning PCB congener #170

   PCB_170_D

   The lowest detectable concentration of PCB congener #170 of 209 for this laboratory and methodology.

   PCB180_PPB

   PCB congener # 180 of 209 possible in units of parts per billion 2,2',3,4,4',5,5'-HEPTACHLOROBIPHENYL

   PCB_180_Q

   Qualifier concerning PCB congener #180

   PCB_180_D

   The lowest detectable concentration of PCB congener #180 of 209 for this laboratory and methodology.

   PCB187_PPB

   PCB congener # 187 of 209 possible in units of parts per billion 2,2',3,4',5,5',6-HEPTACHLOROBIPHENYL

   PCB_187_Q

   Qualifier concerning PCB congener #187

   PCB_187_D

   The lowest detectable concentration of PCB congener #187 of 209 for this laboratory and methodology.

   PCB195_PPB

   PCB congener # 195 of 209 possible in units of parts per billion 2,2',3,3',4,4',5,6-OCTACHLOROBIPHENYL

   PCB_195_Q

   Qualifier concerning PCB congener #195

   PCB_195_D

   The lowest detectable concentration of PCB congener #195 of 209 for this laboratory and methodology.

   PCB200_PPB

   PCB congener # 200 of 209 possible in units of parts per billion

   PCB_200_Q

   Qualifier concerning PCB congener #200

   PCB_200_D

   The lowest detectable concentration of PCB congener #200 of 209 for this laboratory and methodology.

   PCB206_PPB

   PCB congener # 206 of 209 possible in units of parts per billion 2,2',3,3',4,4',5,5',6-NONACHLOROBIPHENYL

   PCB_206_Q

   Qualifier concerning PCB congener #206

   PCB_206_D

   The lowest detectable concentration of PCB congener #206 of 209 for this laboratory and methodology.

   PCB209_PPB

   PCB congener # 209 of 209 possible in units of parts per billion 2,2',3,3',4,4',5,5',6,6'-DECACHLOROBIPHENYL

   PCB_209_Q

   Qualifier concerning PCB congener #209

   PCB_209_D

   The lowest detectable concentration of PCB congener #209 of 209 for this laboratory and methodology.

   A1016/1242

   PCB in units of parts per billion Arochlor equivalent number 1016/1242; this is the older method of reporting PCB.

   A1016_Q

   Arochlor 1016/1242 qualifier

   A1016_D

   Arochlor 1016/1242 detection limit

   AC1021_C

   arochlor 1021 PCB in units of ppb

   AC1021_Q

   arochlor 1021 PCB qualifier

   AC1021_D

   arochlor 1021 PCB detection limit

   AC1232_PPB

   PCB in units of parts per billion Arochlor equivalent number 1232; this is the older method of reporting PCB.

   AC1232_Q

   Arochlor 1232 qualifier

   AC1232_D

   Arochlor 1232 detection limit

   AC1248_PPB

   PCB in units of parts per billion Arochlor equivalent number 1248; this is the older method of reporting PCB.

   AC1248_Q

   Arochlor 1248 qualifier

   AC1248_D

   Arochlor 1248 detection limit

   AC1254_PPB

   PCB in units of parts per billion Arochlor equivalent number 1254; this is the older method of reporting PCB.

   AC1254_Q

   Arochlor 1254 qualifier

   AC1254_D

   Arochlor 1254 detection limit

   AC1260_PPB

   PCB in units of parts per billion Arochlor equivalent number 1260; this is the older method of reporting PCB.

   AC1260_Q

   Arochlor 1260 qualifier

   AC1260_D

   Arochlor 1260 detection limit

   TOXPHENE_C

   Toxaphene (pesticide) in units of parts per billion

   TOXPHENE_Q

   Any qualifier information or comments about toxaphene- e.g...less than(<); analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   TOXPHENE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DDT_4,4'_C

   DDT 4,4' parts per billion = p,p DDT in units of parts per billion

   DDT_4,4'_Q

   Any qualifier information or comments about DDT 4,4' - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDT_4,4'_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DDT_2,4'_C

   DDT 2,4 parts per billion = o,p DDT in units of parts per billion

   DDT_2,4'_Q

   Any qualifier information or comments about DDT 2, 4' - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDT_2,4'_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DDE_4,4'_C

   DDE 4,4 isomer in units of parts per billion

   DDE_4,4'_Q

   Any qualifier information or comments about DDE 4, 4' - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDE_4,4'_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DDE_2,4'_C

   DDE 2,4 isomer in units of parts per billion

   DDE_2,4'_Q

   Any qualifier information of comments about DDE 2,4' - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDE_2,4'_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DDD_4,4'_C

   DDD 4,4 isomer in units of parts per billion

   DDD_4,4'_Q

   Any qualifier information or comments about DDD 4,4' - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDD_4,4'_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DDD_2,4'_C

   DDD 2,4 isomer in units of parts per billion

   DDD_2,4'_Q

   Any qualifier information or comments about DDD 2,4' - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDD_2,4'_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DDM_C

   DDM in units of parts per billion

   DDM_Q

   Any qualifier information or comments about DDM - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DDM_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   7CHLR_C

   Heptachlor (insecticide) in units of parts per billion

   7CHLR_Q

   Any qualifier information or comments about heptachlor - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   7CHLR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   7CHLR_EPXC

   Heptachlor epoxide (soil oxidation product, insecticide) in units of parts per billion

   7CHLR_EPXQ

   Any qualifier information or comments about heptachlor epoxide - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   7CHLR_EPXD

   The lowest detectable concentration of this compound for this laboratory and methodology

   6CLBNZ_C

   Hexachlorobenzene (fungicide) in units of parts per billion

   6CLBNZ_Q

   Any qualifier information of comments about Hexachlorobenzene - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   6CLBNZ_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ENDRIN_C

   Endrin(insecticide) in units of parts per billion

   ENDRIN_Q

   Any qualifier information or comments about Endrin - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ENDRIN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ENDR_ALD_C

   Endrin Aldehyde (Endrin oxidation product) in units of parts per billion

   ENDR_ALD_Q

   Any qualifier information or comments about Endrin Aldehyde - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ENDR_ALD_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ALDRIN_C

   Aldrin (insecticide) in units of parts per billion

   ALDRIN_Q

   Any qualifier information or comments about Aldrin - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ALDRIN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DIELDRN_C

   Dieldrin (insecticide) in units of parts per billion

   DIELDRN_Q

   Any qualifier information or comments about Dieldrin - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DIELDRN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CLRDNE(T)C

   Chlordane total (pesticide) in units of parts per billion

   CLRDNE(T)D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CLRDNE(T)Q

   Any qualifier information or comments about Chlordane total - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CLRDNE(A)C

   Chlordane (alpha)=cis-chlordane in units of parts per billion

   CLRDNE(A)D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CLRDNE(A)Q

   Any qualifier information or comments about Chlordane (alpha) - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CLRDNE(G)C

   Chlordane gamma (pesticide) in units of parts per billion

   CLRDNE(G)D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CLRDNE(G)Q

   Any qualifier information or comments about Chlordane gamma - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   T-9CHLOR_C

   Trans -nonachlor in units of parts per billion

   T-9CHLOR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   T-9CHLOR_Q

   Any qualifier information or comments about Trans -nonachlor - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   OXYCLRDN_C

   Oxychlordane, pesticide in units of parts per billion

   OXYCLRDN_Q

   Any qualifier information or comments about Oxychlordane - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   OXYCLRDN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C-9CHLORC

   CIS-Nonachlor in units of parts per billion

   C-9CHLORQ

   Any qualifier information or comments about CIS-Nonachlor - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C-9CHLORD

   The lowest detectable concentration of this compound for this laboratory and methodology

   NONACHL_C

   Nonachlor in units of parts per billion

   NONACHL_Q

   Any qualifier information or comments about Nonachlor - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   MIREX_C

   Mirex (pesticide) in units of parts per billion

   MIREX_Q

   Any qualifier information of comments about mirex - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   MIREX_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   METHOXYCLC

   Methoxychlor (pesticide) in units of parts per billion

   METHOXYCLQ

   Any qualifier information or comments about Methoxychlor - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   METHOXYCLD

   The lowest detectable concentration of this compound for this laboratory and methodology

   BHC(A)_C

   BHC (alpha isomer) - hexachlorocyclohexane, in units of parts per billion

   BHC(A)_Q

   Any qualifier information or comments about BHC (alpha isomer) - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BHC(A)_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BHC(ß)_C

   BHC (beta isomer) hexachlorocyclohexane in units of parts per billion

   BHC(ß)_Q

   Any qualifier information or comments about BHC (beta isomer) - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BHC(ß)_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BHC(D)_C

   BHC (delta isomer) hexachlorocyclohexane in units of parts per billion

   BHC(D)_Q

   Any qualifier information or comments about BHC (delta isomer) - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BHC(D)_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   LINDANE_C

   BHC (gamma isomer) hexachlorocyclohexanein units of parts per billion; Lindane is also known as BHC (gamma)

   LINDANE_Q

   Any qualifier information or comments about Lindane (BHC gamma) - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   LINDANE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ENDOSUL2_C

   Endosulfan II (Endosulfan isomer) in units of parts per billion

   ENDOSUL2_Q

   Any qualifier information or comments about Endosulfan II - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ENDOSUL2_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ENDOS_SU_C

   Endosulfan sulfate (endosulfan oxidation product) in units of parts per billion

   ENDOS_SU_Q

   Any qualifier information or comments about Endosulfan sulfate - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ENDOS_SU_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ENDOSUL1_C

   Endosulfan I (endosulfan isomer) in units of parts per billion

   ENDOSUL1_Q

   Any qualifier information or comments about Endosulfan I - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ENDOSUL1_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ATRAZINE_C

   Atrazine in units of parts per billion

   ATRAZINE_Q

   Any qualifier information or comments about Atrazine - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ATRAZINE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   SIMAZINE_C

   Simazine in units of parts per billion

   SIMAZINE_Q

   Any qualifier information or comments about Simazine - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   SIMAZINE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ALACHLOR_C

   Alachlor in units of parts per billion

   ALACHLOR_Q

   Any qualifier information or comments about Alachlor - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ALACHLOR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   MBT_C

   concentration of monobutyl tin (anti - fouling metal organic), in units of parts per billion

   MBT_Q

   Any qualifier information or comments about monobutyl tin - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   MBT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DBT_C

   concentration of Dibutyl tin (anti - fouling metal organic compound), in units of parts per billion

   DBT_Q

   Any qualifier information or comments about Dibutyl tin - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DBT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   TBT_C

   concentration of Tributyl tin (anti - fouling metal organic compound), in units of parts per billion

   TBT_Q

   Any qualifier information or comments about Tributyl tin - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   TBT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   Specific Organics B (PAHs)

   table in the database

   UNIQUE_ID

   Database ID unique to this specific sample; assigned by USGS; used to link data between tables

   BENZNE_C

   parent structure of aromatic ring hydrocarbon class (PAH), benzene in units of parts per billion

   BENZNE_Q

   Any qualifier information or comments about benzene - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BENZNE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2BZTPN_C

   dibenzothiophene in units of parts per billion

   2BZTPN_Q

   Any qualifier information or comments about dibenzothiophene - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2BZTPN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2BZTPN(T)C

   dibenzothiophene (diphenylene sulfide) total of C0, C1, C2, and C3 in units of parts per billion

   2BZTPN(T)Q

   Any qualifier information or comments about dibenzothiophene total - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2BZTPN(T)D

   The lowest detectable concentration of this compound for this laboratory and methodology

   A2BZTP(T)C

   alkyl dibenzothiophene (total) in units of parts per billion

   A2BZTP(T)Q

   qualifier information about alkyl dibenzothiophene (total)

   A2BZTP(T)D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C1DIBZTPNC

   dibenzothiophene (C1) in units of parts per billion

   C1DIBZTPNQ

   Any qualifier information or comments about dibenzothiophene (C1) - e.g....less than (<); analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C1DIBZTPND

   The lowest detectable concentration of this compound for this laboratory and methodology

   C2DIBZTPNC

   dibenzothiophene (C2) in units of parts per billion (C2DBT mass 212)

   C2DIBZTPNQ

   Any qualifier information or comments about dibenzothiophene (C2) - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C2DIBZTPND

   The lowest detectable concentration of this compound for this laboratory and methodology

   C3DIBZTPNC

   dibenzothiophene (C3) in units of parts per billion (C3DBT mass 226)

   C3DIBZTPNQ

   Any qualifier information or comments about dibenzothiophene (C3) - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C3DIBZTPND

   The lowest detectable concentration of this compound for this laboratory and methodology

   NBTHIOPH_C

   naphthobenzothiophene in units of parts per billion

   NBTHIOPH_Q

   naphthobenzothiophene qualifier

   NBTHIOPH_D

   naphthobenzothiophene detect limit

   AL_NBTHI_C

   alkyl naphthobenzothiophene in units of parts per billion

   AL_NBTHI_Q

   alkyl naphthobenzothiophene qualifier

   AL_NBTHI_D

   alkyl naphthobenzothiophene detection limit

   2BZFRN(T)C

   dibenzofuran (total) = diphenylene oxide (PAH) in units of parts per billion

   2BNZFRN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2BNZFRN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   NAPHTHLN_C

   measured napthalene (not substituted) in units of parts per billion

   NAPHTHLN_Q

   Any qualifier information or comments about Naphthalene - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   NAPHTHLN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   AKNAPHTH_C

   alkyl naphthalenes in parts per billion

   AKNAPHTH_Q

   alkyl naphthalenes qualifier

   AKNAPHTH_D

   alkyl naphthalenes detection limit

   C1NPHTLN_C

   1-methyl napthalene (mass 142) and 2-methyl napthalene in units of parts per billion

   C1NPHTLN_Q

   Any qualifier information or comments about Naphthalenes (C1) - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C1NPHTLN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   1-MTYLNAPC

   1- methyl -naphthalene (PAH) in units of parts per billion, a subcomponent of C1 Naphthalene

   1-MTYLNAPQ

   Any qualifier information or comments about 1-Methyl-Napthalene - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   1-MTYLNAPD

   The lowest detectable concentration of this compound for this laboratory and methodology

   2-MTYLNAPC

   2- methyl -naphthalene (PAH) in units of parts per billion, a subcomponent of C2 Naphthalene

   2-MTYLNAPQ

   Any qualifier information or comments about 2-Methyl-Napthalene - e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2-MTYLNAPD

   The lowest detectable concentration of this compound for this laboratory and methodology

   C2NPHTLN_C

   Naphthalenes (C2); 2,6-dimethyl napthalene (mass 156) in ppb

   C2NPHTLN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C2NPHTLN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C3NPHTLN_C

   Naphthalenes (C3); 2,3,5-trimethyl napthalene (mass 170) =1,6,7-trimethyl napthalene

   C3NPHTLN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C3NPHTLN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C4NPHTLN_C

   Naphthalenes (C4) (mass 184) in ppb

   C4NPHTLN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C4NPHTLN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BIPHENYL_C

   biphenyl (mass 154 also) in units of parts per billion

   BIPHENYL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BIPHENYL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ALKBIPH_C

   Alkyl biphenyls in units of parts per billion

   ALKBIPH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ALKBIPH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ACNPHTHN_C

   Acenaphthene (mass 154 also) in units of parts per billion

   ACNPHTHN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ACNPHTHN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ACNPHTYL_C

   Acenaphthylene (mass 152) in units of parts per billion

   ACNPHTYL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ACNPHTYL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   FLUORENE_C

   Fluorene (mass 166) in units of parts per billion

   FLUORENE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   FLUORENE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ALFLUOR_C

   Alkyl fluorenes in units of parts per billion

   ALFLUOR_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ALFLUOR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C1FLORNE_C

   Fluorene C1, (mutagenic) in units of parts per billion

   C1FLORNE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C1FLORNE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C2FLORNE_C

   Fluorene C2, (mutagenic) in units of parts per billion

   C2FLORNE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C2FLORNE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C3FLORNE_C

   Fluorene C3, (mutagenic) in units of parts per billion

   C3FLORNE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C3FLORNE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   PHNANTHR_C

   Phenanthrene (mass 178) in units of parts per billion

   PHNANTHR_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   PHNANTHR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   1-MT-PHE_C

   Phenanthrene (C1) =1-Methyl Phenanthrene (mass 192) in ppb

   1-MT-PHE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   1-MT-PHE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C1PHENAN_C

   C1-Phenanthrenes in parts per billion

   C1PHENAN_Q

   C1-Phenanthrenes qualifier

   C1PHENAN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C2PHNANT_C

   C2 homolog of phenanthrene (anthracene) (PAH) in units of parts per billion

   C2PHNANT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C2PHNANT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C3PHNANT_C

   C3 homolog of phenanthrene (anthracene) in units of parts per billion

   C3PHNANT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C3PHNANT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C4PHNANT_C

   C4 homolog of phenanthrene (anthracene) in units of parts per billion

   C4PHNANT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C4PHNANT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ALK_PHEN_C

   Alkyl phenanthrenes in units of parts per billion

   ALK_PHEN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ALK_PHEN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ANTHRACN_C

   Anthracene (mass 178) in parts per billion

   ANTHRACN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ANTHRACN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BZ(A)ANT_C

   Anthracene (C1)=Benz anthracene = benzoanthracene=Benzo(a) anthracene (mass 228) in ppb

   BZ(A)ANT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BZ(A)ANT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2(AH)ANT_C

   Anthracene (C1) = dibenz (a,h) anthracene (mass 278) = Dibenzo Anthracene in ppb

   2(AH)ANT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2(AH)ANT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   PYRENE_C

   Pyrene (mass 202) in parts per billion

   PYRENE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   PYRENE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BZ(A)PYR_C

   Benzo (a) pyrene (mass 252 also) in ppb

   BZ(A)PYR_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BZ(A)PYR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BZ(E)PYR_C

   Benzo (e) pyrene (mass 252 also) in ppb

   BZ(E)PYR_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BZ(E)PYR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BZPYRISO_C

   Benzo pyrene isomers in units of parts per billion

   BZPYRISO_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BZPYRISO_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   IN(123)PYC

   Indeno(123)Pyrene = Indeno(1,2,3-cd) pyrene

   IN(123)PYQ

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   IN(123)PYD

   The lowest detectable concentration of this compound for this laboratory and methodology

   ALK_PYR_C

   Alkyl pyrenes in units of parts per billion

   ALK_PYR_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ALK_PYR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   FLORNTHN_C

   Fluoranthene (mass 202) in ppb

   FLORNTHN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   FLORNTHN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   C1FLRNTHNC

   C1-Fluoranthene= benzofluoranthene=measured concentration of both benzo (b) and benzo (k) fluoranthene

   C1FLRNTHNQ

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   C1FLRNTHND

   The lowest detectable concentration of this compound for this laboratory and methodology

   BZ(B)FLUOC

   Benzo (B) fluoranthene in units of parts per billion

   BZ(B)FLUOQ

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BZ(B)FLUOD

   The lowest detectable concentration of this compound for this laboratory and methodology

   BZ(K)FLUOC

   Benzo (K) fluoranthene in units of parts per billion

   BZ(K)FLUOQ

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BZ(K)FLUOD

   The lowest detectable concentration of this compound for this laboratory and methodology

   CHRYSENE_C

   Chrysene (mass 228) in units of parts per billion

   CHRYSENE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CHRYSENE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CHRYS_C1_C

   Chrysene (C1) in units of parts per billion

   CHRYS_C1_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CHRYS_C1_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CHRYS_C2_C

   Chrysene (C2) in units of parts per billion

   CHRYS_C2_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CHRYS_C2_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CHRYS_C3_C

   Chrysene (C3) in units of parts per billion

   CHRYS_C3_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CHRYS_C3_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CHRYS_C4_C

   Chrysene (C4) in units of parts per billion

   CHRYS_C4_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CHRYS_C4_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CHRY_ISO_C

   Chrysene isomers in units of parts per billion

   CHRY_ISO_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CHRY_ISO_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ALCH_ISO_C

   Alkyl chrysene isomers in units of parts per billion

   ALCH_ISO_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ALCH_ISO_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   AL_CHRYS_C

   Alkyl chrysene in units of parts per billion

   AL_CHRYS_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   AL_CHRYS_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   PERYLENE_C

   Perylene (mass 252) (PAH) in units of parts per billion

   PERYLENE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   PERYLENE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BNZ(G)PYLC

   benzo (g) perylene (PAH) in units of parts per billion

   BZ(G)PYL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BZ(G)PYL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   B(GHI)PYLC

   benzo (g,h,i) perylene (mass 276) (PAH) in units of parts per billion

   B(GHI)PYLQ

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   B(GHI)PYLD

   The lowest detectable concentration of this compound for this laboratory and methodology

   235TMTNAPC

   2,3,5-Trimethylnaphthalene ppb

   235TMTNAPQ

   2,3,5-Trimethylnaphthalene qualifier

   235TMTNAPD

   2,3,5-Trimethylnaphthalene detection limit

   26DMTNAP_C

   2,6-Dimethylnaphthalene ppb

   26DMTNAP_Q

   2,6-Dimethylnaphthalene qualifier

   26DMTNAP_D

   2,6-Dimethylnaphthalene detection limit

   C1FLRPYR_C

   C1-Fluoranthene Pyrene ppb

   C1FLRPYR_Q

   C1-Fluoranthene Pyrene qualifier

   C1FLRPYR_D

   C1-Fluoranthene Pyrene detection limit

   Specific Organics C (Aliphatic Hydrocarbons)

   table in the database

   UNIQUE_ID

   Database ID unique to this specific sample; assigned by USGS; used to link data between tables

   N_DECANE_C

   N-decane in units of parts per billion

   N_DECANE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_DECANE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_DOCOSN_C

   N-docosane in units of parts per billion

   N_DOCOSN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_DOCOSN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_DODECA_C

   N-dodecane in units of parts per billion

   N_DODECA_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_DODECA_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_DOTRCT_C

   N-dotriacontane in units of parts per billion

   N_DOTRCT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_DOTRCT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_EICOSN_C

   N-eicosane in units of parts per billion

   N_EICOSN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_EICOSN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_HENESN_C

   N-heneicosane in units of parts per billion

   N_HENESN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_HENESN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_HENTCT_C

   N-hentriacontane in units of parts per billion

   N_HENTCT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_HENTCT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_HEPADC_C

   N-heptadecane in units of parts per billion

   N_HEPADC_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_HEPADC_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_HEPTSN_C

   N-heptacosane in units of parts per billion

   N_HEPTSN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_HEPTSN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_HEXADC_C

   N-hexadecane in units of parts per billion

   N_HEXADC_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_HEXADC_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_HEXASN_C

   N-hexacosane in units of parts per billion

   N_HEXASN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_HEXASN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_NONADC_C

   N-nonadecane in units of parts per billion

   N_NONADC_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_NONADC_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_NONASN_C

   N-nonacosane in units of parts per billion

   N_NONASN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_NONASN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_OCTADC_C

   N-octadecane in units of parts per billion

   N_OCTADC_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_OCTADC_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_OCTASN_C

   N-octacosane in units of parts per billion

   N_OCTASN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_OCTASN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_PENTDC_C

   N-pentadecane in units of parts per billion

   N_PENTDC_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_PENTDC_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_PENTSN_C

   N-pentacosane in units of parts per billion

   N_PENTSN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_PENTSN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_TETRCT_C

   N-tetratriacontane in units of parts per billion

   N_TETRCT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_TETRCT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_TETRDC_C

   N-tetradecane in units of parts per billion

   N_TETRDC_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_TETRDC_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_TETRSN_C

   N-tetracosane in units of parts per billion

   N_TETRSN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_TETRSN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_TRIACT_C

   N-triacontane in units of parts per billion

   N_TRIACT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_TRIACT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_TRICSN_C

   N-tricosane in units of parts per billion

   N_TRICSN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_TRICSN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_TRIDC_C

   N-tridecane in units of parts per billion

   N_TRIDC_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_TRIDC_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_TRITCT_C

   N-tritriacontane in units of parts per billion

   N_TRITCT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_TRITCT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N_UNDECA_C

   N_undecane in units of parts per billion

   N_UNDECA_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N_UNDECA_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   Specific Organics D (Miscellaneous)

   table in the database

   UNIQUE_ID

   Database ID unique to this specific sample; assigned by USGS; used to link data between tables

   CARBAZOL_C

   carbazole in units of parts per billion

   CARBAZOL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CARBAZOL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   4-CLRANL_C

   4-chloroaniline in units of parts per billion

   4-CLRANL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   4-CLRANL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2-CLRNAP_C

   2-chloronaphthalene in units of parts per billion

   2-CLRNAP_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2-CLRNAP_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2-CLRPHN_C

   2-chlorophenol in parts per billion

   2-CLRPHN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2-CLRPHN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   4-CLRPPE_C

   4-chlorophenylphenylether in parts per billion

   4-CLRPPE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   4-CLRPPE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   4CL3MTPH_C

   4chloro 3methyl phenol in parts per billion

   4CL3MTPH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   4CL3MTPH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   24-2CLPH_C

   2,4-dichlorophenol in parts per billion

   24-2CLPH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   24-2CLPH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   24-2MTPH_C

   2,4-dimethylphenol in parts per billion

   24-2MTPH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   24-2MTPH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2MTHPHTH_C

   dimethyl phthalate in parts per billion

   2MTHPHTH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2MTHPHTH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   24-2NTPH_C

   2,4-dinitrophenol in parts per billion

   24-2NTPH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   24-2NTPH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   24-2NTOL_C

   2,4-dinitrotoluene in parts per billion

   24-2NTOL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   24-2NTOL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   26-2NTOL_C

   2,6-dinitrotoluene in parts per billion

   26-2NTOL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   26-2NTOL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2M46DNPH_C

   2methyl 4,6-dinitrophenol in parts per billion

   2M46DNPH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2M46DNPH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2N-OCTP_C

   di-n-octyl phthalate in parts per billion

   2N-OCTP_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2N-OCTP_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2N-BTLP_C

   di-n-butyl phthalate in parts per billion

   2N-BTLP_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2N-BTLP_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   6CLCYPEN_C

   hexachlorocyclopentadiene in parts per billion

   6CLCYPEN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   6CLCYPEN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   6CLRETH_C

   hexachloroethane in parts per billion

   6CLRETH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   6CLRETH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2-MTHPHN_C

   2-methylphenol in parts per billion

   2-MTHPHN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2-MTHPHN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   4-MTHPHN_C

   4-methylphenol in parts per billion

   4-MTHPHN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   4-MTHPHN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2-NTRANL_C

   2-nitro aniline in parts per billion

   2-NTRANL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2-NTRANL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   3-NTRANL_C

   3-nitro aniline in parts per billion

   3-NTRANL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   3-NTRANL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   4-NTRANL_C

   4-nitro aniline in parts per billion

   4-NTRANL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   4-NTRANL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   NTRBNZ_C

   nitrobenzene in parts per billion

   NTRBNZ_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   NTRBNZ_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   2-NTRPHN_C

   2-nitrophenol in parts per billion

   2-NTRPHN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   2-NTRPHN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   4-NTRPHN_C

   4-nitrophenol in parts per billion

   4-NTRPHN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   4-NTRPHN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N-NDPHA_C

   n-nitrosodiphenylamine in parts per billion

   N-NDPHA_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N-NDPHA_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   N-NDNPRA_C

   n-nitrosodi-n-propylamine in parts per billion

   N-NDNPRA_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   N-NDNPRA_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   5CLRPHN_C

   pentachlorophenol in parts per billion

   5CLRPHN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   5CLRPHN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   PHENOL_C

   phenol (C6H5OH) in parts per billion

   PHENOL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   PHENOL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   PYRIDINE_C

   pyridine in parts per billion

   PYRIDINE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   PYRIDINE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   124TCLBZ_C

   1,2,4-trichlorobenzene in parts per billion

   124TCLBZ_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   124TCLBZ_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   245TCLPH_C

   2,4,5-trichlorophenol in parts per billion

   245TCLPH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   245TCLPH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   246TCLPH_C

   2,4,6-trichlorophenol in parts per billion

   246TCLPH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   246TCLPH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ENDR_KET_C

   endrin ketone in parts per billion

   ENDR_KET_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ENDR_KET_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CARBFNTH_C

   Carbofenothion in units of parts per billion

   CARBFNTH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CARBFNTH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   CLRPYRFS_C

   Chlorpyrifos in units of parts per billion

   CLRPYRFS_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   CLRPYRFS_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DIAZINON_C

   Diazinon in units of parts per billion

   DIAZINON_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DIAZINON_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DICOFOL_C

   Dicofol in units of parts per billion

   DICOFOL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DICOFOL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DISULFOT_C

   Disulfoton in units of parts per billion

   DISULFOT_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DISULFOT_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ETHION_C

   Ethion in units of parts per billion

   ETHION_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ETHION_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   OXYFLRFN_C

   Oxyfluorfen in units of parts per billion

   OXYFLRFN_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   OXYFLRFN_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   PHYTANE_C

   Phytane in units of parts per billion

   PHYTANE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   PHYTANE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   PRISTANE_C

   Pristane in units of parts per billion

   PRISTANE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   PRISTANE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   TERBUFOS_C

   Terbufos in units of parts per billion

   TERBUFOS_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   TERBUFOS_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BCEOM_C

   Bis (2-chloroethoxy) methane in parts per billion

   BCEOM_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BCEOM_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BCEE_C

   Bis (2-chloroethyl) ether in parts per billion

   BCEE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BCEE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   B2CIE_C

   Bis (2-chloroisopropyl) ether in parts per billion

   B2CIE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   B2CIE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   TBRETHYL_C

   tribromoethylene in parts per billion

   TBRETHYL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   TBRETHYL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   4BPPE_C

   4 bromophenyl phenyl ether in parts per billion

   4BPPE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   4BPPE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   ISOPHOR_C

   isophorone in parts per billion

   ISOPHOR_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   ISOPHOR_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BUTBNZPHTC

   butylbenzyl phthalate

   BUTBNZPHTQ

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BUTBNZPHTD

   The lowest detectable concentration of this compound for this laboratory and methodology

   DCBENZNE_C

   dichlorobenzene in parts per billion

   DCBENZNE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DCBENZNE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   12-2CLBZ_C

   1,2-dichlorobenzene in parts per billion

   12-2CLBZ_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   12-2CLBZ_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   13-2CLBZ_C

   1,3-dichlorobenzene in parts per billion

   13-2CLBZ_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   13-2CLBZ_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   14-2CLBZ_C

   1,4-dichlorobenzene in parts per billion

   14-2CLBZ_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   14-2CLBZ_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BENZDINE_C

   Benzidine in parts per billion

   BENZDINE_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BENZDINE_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   33-2CLBZDC

   3,3-dichlorobenzidine in parts per billion

   33-2CLBZDQ

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   33-2CLBZDD

   The lowest detectable concentration of this compound for this laboratory and methodology

   BENZACID_C

   Benzoic acid in parts per billion

   BENZACID_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BENZACID_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   BENZALCO_C

   Benzyl-alcohol in parts per billion

   BENZALCO_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   BENZALCO_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   DIETH_PH_C

   diethyl phthalate in parts per billion

   DIETH_PH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   DIETH_PH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   B2E_PHTH_C

   bis(2-ethylhexyl)phthalate in parts per billion

   B2E_PHTH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   B2E_PHTH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   OTH_PHTH_C

   other phthalate in parts per billion

   OTH_PHTH_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   OTH_PHTH_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   PERYUL_C

   peryulene in parts per billion

   PERYUL_Q

   Any qualifier information or comments e.g....less than (<) analytical problems; corrections made during VALIDS; indications of poor quality data, etc.

   PERYUL_D

   The lowest detectable concentration of this compound for this laboratory and methodology

   Grain Size Data

   table in the database

   UNIQUE_ID

   Database ID unique to this specific sample; assigned by USGS; used to link data between tables

   Range of values
   Minimum:	231
   Maximum:	2625

   METHOD_FI

   Method used in analysis of fine fraction

   Value	Definition
   2 types of samples analyzed: A subsample of the composited homogenate (top 2-3 cm of sediment taken from collective grabs) was analyzed for grain distribution. Also small core samples taken from each of 3 grabs were used for determination of % silt/clay.
   A subsample of the composited homogenate (top 2-3 cm of sediment taken from collective grabs) was used to determine % silt/clay. (Grain size distribution not analyzed. No small cores collected).
   small core samples taken from each of 3 grabs were used for determination of % silt/clay. (Grain size distribution dropped as parameter).
   (empty)

   METHOD_CO

   Method used in analysis of coarse fraction

   Value	Definition
   SAND_PCT = 100 - FINES_SIL. The percent sand calculation is: %sand = sand wt/(sand wt + silt-clay wt) * 100
   SAND_PCT was interpreted (estimated) by F. Manheim from lithologic descriptions written by P. Connor
   (empty)

   SAND_PCT

   Sand content in percent dry weight of sample (particles with nominal diameters less than 2 mm but greater than or equal to 0.0625 mm; 0 through 4 phi)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	99.5
   Units:	percent dry weight of sample
   Resolution:	0.1

   SILT_PCT

   Silt content in percent dry weight of the sample (particles with nominal diameters less than 0.0625 mm but greater than or equal to 0.004 mm; 5 through 8 phi, inclusive)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	87
   Units:	percent dry weight of sample
   Resolution:	0.1

   CLAY_PCT

   Clay content in percent dry weight of the sample (particles with nominal diameters less than 0.004 mm; 9 phi and smaller)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0.64
   Maximum:	89.67
   Units:	percent dry weight of sample
   Resolution:	0.1

   FINES_SIL

   Percent dry weight reported in both the silt and clay fractions (i.e. silt plus clay)

   Value	Definition
   (empty)

   Range of values
   Minimum:	0.5
   Maximum:	99.6
   Units:	percent dry weight of sample
   Resolution:	0.1

   TEXT_Q

   The designation ""W"" in quality-control fields placed adjacent to data fields warns that the data in question appear to show unresolved anomalies.

   Value	Definition
   W	data appear to have unresolved anomalies
   (empty)	no anomalies indicated

   MEDIAN

   Median grain size (middle point in the grain-size distribution) in phi units; also = 50% quartile of the cumulative weight frequency

   Value	Definition
   (empty)

   Range of values
   Minimum:	0.5
   Maximum:	10.27
   Units:	phi
   Resolution:	0.01

   MEAN

   Mean (average) grain size in phi units

   Value	Definition
   (empty)

   Range of values
   Minimum:	2.26
   Maximum:	9.64
   Units:	phi
   Resolution:	0.01

   Q1_PHI

   The 25% quartile of the cumulative weight frequency of the sediment grain diameters (in phi units).

   Value	Definition
   (empty)

   Range of values
   Minimum:	0.2
   Maximum:	3.9
   Units:	phi
   Resolution:	0.1

   Q3_PHI

   The 75% quartile of the cumulative weight frequency of the sediment grain diameters (in phi units).

   Value	Definition
   (empty)

   Range of values
   Minimum:	1.8
   Maximum:	7.9
   Units:	phi
   Resolution:	0.1

   QUARDVTN

   The Phi quartile deviation; calculated as (Phi 75 - Phi 25)/2.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0.5
   Maximum:	2
   Units:	phi
   Resolution:	0.1

   STDEV_SORT

   Standard deviation (root mean square of the deviations) of grain-size distribution in phi units

   Value	Definition
   (empty)

   Range of values
   Minimum:	0.72
   Maximum:	8.75
   Units:	phi
   Resolution:	0.1

   SKEWNESS

   Skewness (deviation from symmetrical form) of grain-size distribution in phi units

   Value	Definition
   (empty)

   Range of values
   Minimum:	-0.1
   Maximum:	0.77
   Units:	phi
   Resolution:	0.1

   KURTOSIS

   Kurtosis (degree of curvature near the mode) of grain size distribution in phi units

   Value	Definition
   (empty)

   Range of values
   Minimum:	0.6
   Maximum:	9.73
   Units:	phi
   Resolution:	0.1

   CLASS_1_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add Cum. amt. passing (or retained)'

   Value	Definition
   phi units (-1)-0
   (empty)

   CLASS_1_%

   Amount (weight percent) for given class.

   Value	Definition
   0	none
   (empty)

   CLASS_2_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 0-1
   (empty)

   CLASS_2_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	14
   Units:	percent by weight
   Resolution:	1

   CLASS_3_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 1-2
   (empty)

   CLASS_3_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	34
   Units:	percent by weight
   Resolution:	1

   CLASS_4_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 2-3
   (empty)

   CLASS_4_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	26
   Units:	percent by weight
   Resolution:	1

   CLASS_5_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 3-4
   (empty)

   CLASS_5_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	30
   Units:	percent by weight
   Resolution:	1

   CLASS_6_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 4-5
   (empty)

   CLASS_6_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	48
   Units:	percent by weight
   Resolution:	1

   CLASS_7_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 5-6
   (empty)

   CLASS_7_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	1
   Maximum:	14
   Units:	percent by weight
   Resolution:	1

   CLASS_8_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 6-7
   (empty)

   CLASS_8_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	18
   Units:	percent by weight
   Resolution:	1

   CLASS_9_DE

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 7-8
   (empty)

   CLASS_9_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	21
   Units:	percent by weight
   Resolution:	1

   CLASS_10_D

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 8-9
   (empty)

   CLASS_10_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	19
   Units:	percent by weight
   Resolution:	1

   CLASS_11_D

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units 9-10
   (empty)

   CLASS_11_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	0
   Maximum:	16
   Units:	percent by weight
   Resolution:	1

   CLASS_12_D

   Description of size class for data reported in terms such as sieve mesh numbers or in inches, e.g. Class 1 might be ""5 mesh"", or "">3 1/2 inches"". If amount reported is cumulative, add ""Cuml. amt. passing (or retained)"".

   Value	Definition
   phi units >10
   (empty)

   CLASS_12_%

   Amount (weight percent) for given class.

   Value	Definition
   (empty)

   Range of values
   Minimum:	5
   Maximum:	48
   Units:	percent by weight
   Resolution:	1

   ANALYST

   Name (usually first initial and last name) of person who performed the grain size or physical properties analysis

   Value	Definition
   see METHOD_CO	(evidently not first initial and last name)
   (empty)

   COMMENTS_O

   Any further information about analysis for all or specific parameters in this table

   Value	Definition
   "sand, silt, and clay = ***"
   "sand, silt, and clay all the same (41.52)"
   "upper 3 inches of core samples analyzed using: Folk, Robert L., 1968. Petrology of sedimentary rocks. University of Tex. 182 p."
   Data derived from fig.21 of referenced source. Figure consists of line graphs for each station showing % by weight of 12 classes of phi units. Figure was gridded and values were estimated for each class at each station.
   missing data due to loss of samples
   Texture too coarse?
   (empty)

   COMMENTS_2

   Further comments pertaining to values in grain size table

   Value	Definition
   estimated sand% from Dunbar's data
   Values for this reference do not always total 100%. Average total for all sites is 103%; range is 90-116%. Classes: sand (-1)-0 to 4-5; silt: 4-5 to 8-9; clay: 8-9 to >10.
   (empty)

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Frank T. Manheim
   • Laura Hayes
2. Who also contributed to the data set?

   Special acknowledgment is given here to S.J. Williams (Chief Scientist of the USGS Coastal and Marine Geology Program, Reston, VA) who provided the initial opportunity for this database development and supplied extensive documents that permitted initiation of data entry. J.L. Kindinger (USGS Coastal and Marine Geology Program, St. Petersburg, FL) provided cooperation throughout the work. A.G. McIntire (now U.S. Bureau of Census, Geography - TIGER Mapping Branch, Upper Marlboro, MD) entered many of the early data sets, converted the database to an initial Microsoft® Access format, and created many of the illustrations in the preliminary publication (Manheim, Hayes, and McIntire, 1998). G.C. Flowers (Tulane University Department of Geology, New Orleans, LA) provided an important unpublished electronic data set. We are grateful for the cooperation of J. Macauley and L. Harwell (US EPA, EMAP Program, Gulf Breeze, FL) for providing unpublished data and clarifying many details about the EMAP data for southern Louisiana estuaries. Finally, we are indebted to the many organizations and participants listed in Participants and Cooperators for the data and cooperation.

3. To whom should users address questions about the data?
   Frank T Manheim

   U.S. Geological Survey, ER

   Mail Stop 954

   12201 Sunrise Valley Drive

   Reston, VA
   

   USA

   703-648-6150 (voice)

   703-648-6252 (FAX)

   fmanheim@usgs.gov

Why was the data set created?

The data are preliminary results of a project to develop a comprehensive database of chemical and environmental information on sediments from Lake Pontchartrain, LA, and surrounding water bodies. The goal is to evaluate all data for reliability and comparability, make them widely accessible to all users, and interpret the data with respect to the environmental status of these important estuaries. It is part of a larger 5-year research program investigating the geological framework of Lake Pontchartrain, LA (FY 1994-FY 1999), begun by S.J. Williams and currently under overall leadership of J.L. Kindinger (USGS, St. Petersburg, FL).

How was the data set created?

1. From what previous works were the data drawn?

   Byrne and DeLeon, 1986 (source 1 of 21)

   Byrne, C.J., and DeLeon, I.R., 1986, Trace metal residues in biota and sediments from Lake Pontchartrain, Louisiana: Bulletin of Environmental Contamination and Toxicology 37, University of New Orleans (UNO) / U.S. Army Corps of Engineers (USACE).

   Type_of_Source_Media: paper
   Source_Contribution:

   Inorganic and organic chemical data: 3 sediment surface samples collected in 1980

   Byrne and DeLeon, 1987 (source 2 of 21)

   Byrne, C.J., and DeLeon, I.R., 1987, Contribution of heavy metals from municipal runoff to the sediments of Lake Pontchartrain: Chemosphere 16:10-12.

   Other_Citation_Details:

   University of New Orleans (UNO) / Louisiana Department of Environmental Quality (LDEQ)

   Type_of_Source_Media: paper
   Source_Contribution:

   Inorganic and organic chemical data: 8 sediment surface samples collected with a petit ponar dredge, inorganic data included.

   Childers, 1985 (source 3 of 21)

   Childers, G.W., 1985, A baseline study of the water quality and selected faunal communities in Lake Maurepas, its major tributaries, and Pass Manchac: Southeastern Louisiana University Department of Biological Sciences, Hammond, LA.

   Other_Citation_Details:

   Southeastern Louisiana University / Louisiana Department of Natural Resources- Coastal Zone Management Division (LDNR-CZMD)

   Type_of_Source_Media: paper
   Source_Contribution:

   Sediment texture data: 70 sediment surface samples collected with a petite ponar dredge from 1983-84, grain size data included

   Crocker, 1988 (source 4 of 21)

   Crocker, J.A., 1988, Sediment deposition in Lake Pontchartrain from the 1973 Bonnet Carré Spillway operation: University of New Orleans Department of Geology and Geophysics, New Orleans, LA.

   Other_Citation_Details: M.Sc. thesis
   

   Type_of_Source_Media: paper
   Source_Contribution:

   Sediment texture data from the Bonnet Carre Spillway: 60 sediment core samples collected, grain size data included

   Demcheck and others, 1996 (source 5 of 21)

   Demcheck, D.K., Garrison, C.R., and McGee, B.D., 1996, Selected water-quality data for the lower Mississippi River, Bonnet Carré Spillway, and Lake Pontchartrain area, Louisiana, April through June 1994 and 1974-84: U.S. Geological Survey Open-File Report 96-652-A, U.S. Geological Survey.

   Type_of_Source_Media: paper
   Source_Contribution:

   Inorganic and organic chemical analyses on bottom sediments and suspensates in the vicinity of the Bonnet Carre Spillway: 19 sediment surface samples collected with a petite ponar grab in 1994, inorganic and organic data included.

   Dunbar and others, 1995 (source 6 of 21)

   Dunbar, J.B., Blaes, M.R., Dueitt, S.E., and May, J.R., 1995, Geological investigation of the Mississippi River deltaic plain: Technical Report GL-84-15, U.S. Army Corps of Engineers, Waterways Experiment Station, Vicksburg, MS.

   Type_of_Source_Media: paper
   Source_Contribution:

   Sediment texture and drill core data: 9 sediment samples collected, grain size data included

   Ferrario and others, 1985 (source 7 of 21)

   Ferrario, J.B., Lawler, G.C., DeLeon, I.R., and Laseter, J.L., 1985, Volatile organic pollutants in biota and sediments of Lake Pontchartrain: Bulletin of Environmental Contamination and Toxicology 34.

   Other_Citation_Details:

   University of New Orleans (UNO) / U.S. Army Corps of Engineers (USACE)

   Type_of_Source_Media: paper
   Source_Contribution:

   Sediment descriptions: 3 sediment surface samples collected in 1980

   Flocks, 1998 (source 8 of 21)

   Flocks, J.G., 1998, New field sampling techniques and data description:.

   This is part of the following larger work.

   Manheim, F.T. (ed.), 1998, Lake Pontchartrain Basin: Bottom sediments and regional scientific and educational resources: U.S. Geological Survey Open-File Report 98-805.

   Type_of_Source_Media: paper
   Source_Contribution:

   Vibracore locations and petrology: 158 vibracore samples collected from 1995-97, lithologic descriptions/grain size data included

   Flowers, G.C., 1987 (unpublished) (source 9 of 21)

   Flowers, G.C., 1987, (unpublished data from Tulane University Department of Geology).

   Type_of_Source_Media: paper
   Source_Contribution:

   Inorganic chemical, texture, and organic carbon data: 121 sediment samples collected, inorganic and grain size data included

   Landrum, 1994 (source 10 of 21)

   Landrum, K.E., 1995, Trace metal variability of estuarine sediments, St. Bernard Geomorphic Region, Louisiana: Gulf Coast Association of Geological Societies Transactions 45.

   Other_Citation_Details: Louisiana Department of Environmental Quality (LDEQ)
   

   Type_of_Source_Media: paper
   Source_Contribution:

   Metals and texture data: 115 sediment surface samples collected with an Eckman mechanical grab, inorganics, organic carbon, and grain size data included

   LDEQ, 1989 (source 11 of 21)

   Louisiana Department of Environmental Qualiry, 1989, Impact assessment of Bayou Trepagnier: Louisiana Department of Environmental Quality, Office of Water Resources, Water Pollution Control Division, Baton Rouge, LA.

   Type_of_Source_Media: paper
   Source_Contribution:

   Inorganic and organic chemical data: 138 sediment core samples collected in 1986, inorganic data included

   Macauley and Summers, 1998 (source 12 of 21)

   Macauley, J.M., and Summers, J.K., 1998, Environmental Monitoring Assessment Program (EMAP) Louisiana Province Database: U.S. Environmental Protection Agency Office of Research and Development.

   Type_of_Source_Media: paper
   Source_Contribution:

   Inorganic, organic chemical data, partial texture data: 326 sediment surface samples collected with a Van Veen grab in 1991-94; inorganic, organic, and grain size data included

   Marot, M., and Holmes, C.W., in review (source 13 of 21)

   Marot, M., and Holmes, C.W., in prep, (data in review): U.S. Geological Survey.

   Type_of_Source_Media: paper
   Source_Contribution:

   Metals and texture: 162 sediment samples collected with box corer and piston corer from 1996 through 1998, inorganic data included

   McFall and others, 1985 (source 14 of 21)

   McFall, J.P., Antoine, S.R., and DeLeon, I.R., 1985, Base-neutral extractable organic pollutants in biota and sediments from Lake Pontchartrain: Chemosphere 14:10.

   Other_Citation_Details:

   University of New Orleans (UNO) / U.S. Army Corps of Engineers (USACE)

   Type_of_Source_Media: paper
   Source_Contribution:

   Sediment descriptions from peripheral waterways: 3 sediment surface samples collected in 1980, with organic data

   Roberts, 1981 (source 15 of 21)

   Roberts, D.W., 1981, Structure and function of nearshore and open lake benthic communities in Lake Pontchartrain, Louisiana: Louisiana State University, Baton Rouge, LA.

   Other_Citation_Details: M.Sc. thesis
   

   Type_of_Source_Media: paper
   Source_Contribution:

   Texture: 10 sediment surface samples collected with a spade corer, grain size data included

   Sarkar, 1995 (source 16 of 21)

   Sarkar, Satavisa, 1995, Heavy metal transport from Bayou Trepagnier into Lake Pontchartrain: Tulane University, New Orleans, LA.

   Other_Citation_Details: M.Sc. thesis
   

   Type_of_Source_Media: paper
   Source_Contribution: Metals and texture data: 37 sediment surface samples collected
   

   Schurtz and St. Pé, 1984 (source 17 of 21)

   Schurtz, M.H., and St. Pé, K.M., 1984, Report on interim findings: Water quality investigation of environmental conditions in Lake Pontchartrain: Louisiana Department of Environmental Quality, Water Pollution Control Division.

   Type_of_Source_Media: paper
   Source_Contribution:

   Inorganic and organic chemical data: 51 sediment surface samples collected with a petite ponar in 1982-83, inorganic and organic data included

   Sikora and Sikora, 1982 (source 18 of 21)

   Sikora, W.B., and Sikora, J.P., 1982, Ecological characterization of the benthic community of Lake Pontchartrain, Louisiana: Louisiana State University, Coastal Ecology Laboratory, Center for Wetlands Resources, Baton Rouge, LA.

   Other_Citation_Details: U.S. Army Corps of Engineers (USACE)
   

   Type_of_Source_Media: paper
   Source_Contribution:

   Organic carbon and sediment density: 86 samples from sediment cores collected with a box corer, organic carbon data included

   Tarver and Dugas, 1973 (source 19 of 21)

   Tarver, J.W., and Dugas, R.J., 1973, A study of the clam, Rangia cuneata, in Lake Pontchartrain and Lake Maurepas: Technical Bulletin 5, Louisiana Wild Life and Fisheries Commission; Oyster, Water Bottoms and Seafoods Division.

   Type_of_Source_Media: paper
   Source_Contribution:

   Texture data: 15 sediment surface samples collected with a Peterson dredge

   Tarver and Savoie, 1976 (source 20 of 21)

   Tarver, J.W., and Savoie, L.B., 1976, An inventory and study of the Lake Pontchartrain-Lake Maurepas estuarine complex: Technical Bulletin 10, Louisiana Wild Life and Fisheries Commission; Oyster, Water Bottoms and Seafoods Division.

   Type_of_Source_Media: paper
   Source_Contribution:

   Texture data from 198 sediment surface samples, grain size data included

   Voyksner, 1985 (source 21 of 21)

   Voyksner, R.D., 1985, Final report: Analysis of metals and organics in sediment and biota: Research Triangle Institute report RTI/2830/00-01Q, Research Triangle Institute, Research Triangle Park, NC.

   Other_Citation_Details: Louisiana Department of Environmental Quality (LDEQ)
   

   Type_of_Source_Media: paper
   Source_Contribution:

   Lake Borgne metals and organic chemical data (1 sample collected in 1984)

2. How were the data generated, processed, and modified?

   Date: 1996 (process 1 of 1)

   The development of the current database involved four phases: 1) Discussions and interactions with knowledgeable individuals and agencies to identify and retrieve pertinent data from many sources, including unpublished data, 2) Selection and augmentation of a data dictionary to provide consistent field/parameter definitions and background documentation, 3) Encoding and integration of the data tables in a master flat-file database system involving eight basic tables linked by unique sample identification codes, 4) Selective querying, mapping, and interpretation of the data with the help of standard data sets to identify potential outliers and quality problems and to identify key geochemical and environmental relationships and processes.
   Environmental issues include linking the chemical data to bulk sediment toxicity criteria, searching for possible contaminant sources, and identifying transport and geochemical processes. The in-depth inventory and assessment was only possible with the help of many partners and cooperators. Data sources used in this process:

   • Byrne and DeLeon, 1986
   • Byrne and DeLeon, 1987
   • Childers, 1985
   • Crocker, 1988
   • Demcheck and others, 1996
   • Dunbar and others, 1995
   • Ferrario and others, 1985
   • Flocks, 1998
   • Flowers, G.C., 1987 (unpublished)
   • Landrum, 1994 (see also Landrum, 1995)
   • LDEQ, 1989
   • Macauley and Summers, 1998
   • Marot, M., and Holmes, C.W., in review
   • McFall and others, 1985
   • Roberts, 1981
   • Sarkar, 1995
   • Schurtz and St. Pé, 1984
   • Sikora and Sikora, 1982
   • Tarver and Dugas, 1973
   • Tarver and Savoie, 1976
   • Voyksner, 1985

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   A variety of methods were used to analyze the accuracy and suitability of data for their intended purposes. These are described in detail in the report, but include knowledgeable assessment of expected relationships among geochemical measures, inspection of the range of values present, bivariate plots of related measures, and comparison of nearby samples for anomalies.
   Assessments of the quality of individual measurements are included in the data as ancillary attributes; the report refers to these as "quality-control fields".
   The designation "W" in quality-control fields placed adjacent to data fields in the full database warns that the data in question appear to show unresolvable anomalies. "0" in a concentration field means that the constituent was analyzed and found to have a concentration below the detection limit for the method utilized. (Zeros are different, therefore, from blank fields, which show that the constituent was not measured). Other remarks in the quality-control fields provide comments relating to the data that may be helpful in interpreting or further evaluating the data. See appendix B for further explanations on quality control and codes.
2. How accurate are the geographic locations?
   Some latitudes and longitudes listed for stations near New Orleans were found to plot on land, rather than offshore. Fortunately, supplementary site descriptions available in the original reference made better site identification possible in this case.
3. How accurate are the heights or depths?
   
4. Where are the gaps in the data? What is missing?
   The report includes sample location maps (as images) that indicate the general distribution of analytical data. Empty cell values in tables indicate analyses that were not obtained from the given location.
5. How consistent are the relationships among the observations, including topology?
   The data in this study have been acquired from historical sources as well as from ongoing field programs. It is not feasible to apply the standard quality-control protocols that check on the details of sampling and analytical methodology (see Baker and Kravitz, 1992) to heterogeneous data. To rescue data while minimizing problems associated with data comparability, special batch screening techniques were used to identify and call attention to data that have unresolved problems. Although such tests do not necessarily prove that the data are in error, they alert users to data that should be reevaluated or confirmed before use in environmental characterization.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: none
Use_Constraints: none

1. Who distributes the data set? (Distributor 1 of 1)
   
   USGS Information Services

   Box 25286 Denver Federal Center

   Denver, CO
   

   USA

   1-888-ASK-USGS (voice)

   303-202-4693 (FAX)

   ask@usgs.gov
2. What's the catalog number I need to order this data set? USGS Professional Paper 1634
3. What legal disclaimers am I supposed to read?

   Sediment chemical and other data on this CD-ROM and the companion web site have been compiled from multiple sources. Reasonable care has been taken in transcription, and efforts have been made to provide quality control of the data as described in the relevant sections. Although efforts have been made to screen for and identify data that may be seriously compromised, the data provided here are not guaranteed to be correct or complete. Responsibility for the data remains with the original sources and not the U.S. Geological Survey (except where USGS analyses are involved), and conclusions drawn from the data are the responsibility of the users. Mention of commercial software or services does not imply endorsement by the USGS.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:

     Station location and sample characteristics, grain-size, and geochemical measurements in format Columnar text (tab-delimited) Tab characters delimit fields; newline characters (LF) delimit records Size: 2.1

     Network links:

     http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/station.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/grain_sz.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/inorgan.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/gen_org.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/organa.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/organb.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/organc.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/organd.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/organu.txt http://pubs.usgs.gov/pp/p1634j/sed_data/db_txt/cas_no.txt

     Data format:	Station location and sample characteristics, grain-size, and geochemical measurements in format Microsoft Access (MDB) (version 97) Size: 0.5
     Network links:	http://pubs.usgs.gov/pp/p1634j/sed_data/pont_dbmdb.zip

     Data format:	Station location and sample characteristics, grain-size, and geochemical measurements in format XLS (version 97) Size: 0.7
     Network links:	http://pubs.usgs.gov/pp/p1634j/sed_data/pont_db.zip

   • Cost to order the data: none

Who wrote the metadata?

Dates:

Last modified: 14-Jun-2016

Metadata author:

Peter N. Schweitzer

Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/

Mail Stop 954 National Center

U.S. Geological Survey

12201 Sunrise Valley Drive

Reston, VA

USA

(703) 648-6533 (voice)

(703) 648-6560 (FAX)

pschweitzer@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)