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41 FILL <br />' The fill at the site occurs as base material below the asphalt surface and as fill <br /> material in the vicinity of the former location of the USTs and underground piping and <br /> utility lines. Man-made fill consisting of pea gravel was observed to exist to a depth of <br /> apppproximately 15 feet bgs in the vicinity of soil boring B-11 drilled through the former <br />' USTs concrete anchor slab <br /> 4 2 NATURAL GROUND <br /> The natural ground encountered in the borings generally consisted of light reddish <br /> brown to light brown clayey silt and sandy silt, slightly mottled light olive brown, moist and <br />' dense. Silt was observed at depths of 40 feet bs m or B-11, 30 feet bgs in boring <br /> MW-1 and 35 feet bgs in borings MW-2 Legit brown poorly graded fine sand was <br /> encountered beneath the silt to the termination depth of 50 feet bgs in boring B-11 <br /> Slightly plastic gray clay was observed in boring MW-1 at 50 and 65 feet bgs. However, <br />' gray clay was observed at 40 and 65 feet bgs in boring MW-2 Below the gray clay are thick <br /> lenses of gray sand to the termination depth of the borings of 70 feet bgs. <br /> 4 3 GROUND WATER <br /> The depth to ground water in the on-site wells, measured on March 5, 1993, ranged <br /> from 56 37 to 56 91 feet bgs (see Table 2) Ground water was encountered approximately <br /> at 55 feet bgs during drilling <br /> Based on the ground water level data obtained from theround water monitoring <br /> wells on the former Unocal Service Station (5606 Pacific Drive located adjacent to the <br /> Montgomery Ward Auto Service Center, the ground water flow direction in the vicinity of <br /> the Montgomery Ward site is to the south (see KEI, 1992) <br /> 5.0 ANALYTICAL TESTING <br /> IAll samples were delivered for analytical testing to Calscience Environmental <br /> Laboratories, Inc. (CEL), a California Department of Health Services (DOHS) certified <br /> hazardous waste testing laboratory (Certificate #257) CEL is certified for all testing <br /> completed as part of this investigation <br /> I 51 SOIL SAMPLES <br /> The soil samples were tested for total petroleum hydrocarbons as gasoline (TPH-G) <br /> using modified EPA Method 8015, BTXE using EPA Method 8020, purgeable halocarbons <br /> using EPA Method 8010, and total lead using EPA Method 6010. Additionally, CEL was <br /> instructed to test any sample with a total lead concentration equal to or greater than 13 <br /> ppm for soluble lead. The results of the testing are shown on Table 3 The laboratory <br /> Ireports are contained in Appendix E <br /> Project No. 1232 6 ENVIRONMENTAL AUDIT INC® <br />