"The pit location maps show the location of all pits bearing Materials Services serial numbers. Other sources are not shown. The plotted locations are as close as possible to the true location as the scale of the map will allow."The point attribute data, captured from the Source pit data sheets are
"designed to show test results (sieve analysis, plasticity index, and abrasion) for the usable material within each ADOT pit."
ITEMS IN MARPITS1.PAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 4 12 F 3 5 PERIMETER 4 12 F 3 9 MARPITS1# 4 5 B - 13 MARPITS1-ID 4 5 B - 17 PITNUM 5 6 C - 22 ORDER 4 5 I - 26 MAP 2 3 C - 28 QTR 2 3 C - 30 SEC 2 3 C - 32 TWP 3 4 C - 35 RNG 3 4 C - 38 HI_CLASS 4 5 C - 42 MATERIAL 30 31 C - 72 PI 4 5 C - 76 ABR_500 4 5 I - 80 SWELL_24 7 8 N 2 87 THR_QTR 4 5 I - 91 NUM_4 4 5 I - 95 NUM_8 4 5 I - 99 NUM_40 4 5 I - 103 NUM_200 4 5 I - 107 SOURCE 4 4 I - BRIEF EXPLANATION OF ITEMS ADDED BY THE AUTHORS TO THE MARPITS1 POINT DATA SET: (items automatically generated by ArcInfo not detailed) --------------------------------------------------------- PITNUM -The pit number of the location. ORDER -The ascending numeric order of the pit number. MAP -The map sheet (from Source) of the pit. QTR -Public Land Survey quarter-section or half-section of the pit location. nw = northwest, ne = northeast, sw = southwest, se = southeast, w2 = western-half, n2 = northern-half and so on. SEC -Public Land Survey section of the pit location. TWP -Public Land Survey township of the pit location. RNG -Public Land Survey range of the pit location. HI_CLASS -Highest classification for material found in the pit. The following are the highest class designations for test data representing at least half or more of the total depth of the pit: MA--mineral aggregate AB--aggregate base SM--select material BR--borrow, no limits set CM--cover material (no specification provided) SB--special backfill (no specification provided) SS--subgrade seal UK--unknown MATERIAL -Material types (clay, sand, gravel, caliche, etc. Abreviations used for various materials found in each pit: [Classification scheme includes a mix of material types (ash, caliche, cinder, clay) and classification of material by size (boulders, silty)] ASH--ash; AND--andesite; BLDR--boulders; BST--basalt, malpais; CAL--caliche; CDR--cinders; CGM--conglomerate; CKR-clinkers; CLY--clay; COB--cobbles; DEC--decomposed; DIRT--dirt; GTE--granite; GVL--gravel; GYP--gypsum; LAV--lava; LOM--loam; LST--limestone; PUM--pumice; RCK--rock; RHY--rhyolite; SH--shale; SLT--silt; SLTY--silty; SND--sand; SS--sandstone; TRAV--travertine *Note that many of these abbreviations may not be found in the data as this list is applicable to data for all counties for which data has been collected. PI -(Plasticity Index) A measure of sensitivity that aggregate has to moisture change and is important when aggregate is used in Portland cement or asphalt concrete. White (1991, p. 13-42) defines PI as "the difference in the Atterberg liquid limit and plastic limit moisture contents." It is a value without a unit. A PI of 4 is the maximum allowed as stipulated in American Society of Testing Material (ASTM) test D 3515 for materials used in asphalt concrete mixtures (White, 1991). The Arizona Highway Department (1972) used several PI standards. These include ones where PI was not detected or was to be less than 5 or 10 depending on aggregate classification. Testing was to be executed in accordance with the requirements of American Association of State Highway and Transportation Officers T 90 (AHD, 1972). Maximum allowable PI values are dependent on which of the 50 categories of aggregate types are in effect. When testing determined no PI, a "NP" (no plasticity) was entered in the ADOT (1977) table. The Open-File Report authors have changed all these "NP" to zero and entered -999 when fields were without values. ABR_500 -Los Angeles (LA) abrasion test (500 rotations). The test used to evaluate the resistance of a coarse aggregate to degradation by abrasion and impact is the Los Angeles abrasion test (Meyer and Zeinak 1991). In accordance with ADOT (1990, p. 718) standard specifications "the percent of wear of coarse aggregate at 500 revolutions, when tested in accordance with the requirements of American Association of State Highway Transportation Officials (AASHTO) test T 96, shall not exceed 40." The same requirement is also specified for the class of aggregate 1 to 4 for material used in subbases and bases (ADOT, 1990, p. 140). The detail of Los Angeles abrasion testing procedures may have changed so the results found in this data release may not be consistent with current specifications. Los Angeles abrasion test results are found in just 8 percent of the pits listed in the inventory. SWELL_24 -Volume change--swell (24 hours). Data are available giving maximum 24-hour volume change (AHD, 1972). Procedures and standards applicable at the time of the test are not given in the inventory but likely may have been AASHTO 101, Method B (AHD, 1972, Table 703-1 and 704-1). These specifications set the maximum allowed volume increase to 0.06. This is the maximum for all classes of mineral aggregate and one class of aggregate used for cover materials and slurry seal. THR_QTR -Percent material passing the 3/4 inch sieve. Materials passing the 3/4 inch mesh sieve are 19 mm or less. NUM_4 -Percent material passing the no. 4 sieve. Materials passing the no. 4 mesh sieve are 4.75 mm or less. NUM_8 -Percent material passing the no. 8 sieve. Materials passing the no. 8 mesh sieve are 2.338 mm or less. NUM_40 -Percent material passing the no. 40 sieve. Materials passing the no. 40 mesh sieve are 0.42 mm or less. NUM_200 -Percent material passing the no. 200 sieve. Materials passing the no. 200 mesh sieve are less than 0.074 mm. SOURCE -Numeric value that relates to marpits1.ref look-up table giving information on the Source.