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i <br /> Coc+clrW Cecchbd,w d Gknw aant.F-hng hl—d <br /> Beginning on April 4, 1995, LIST-2, LIST-3, and UST-4 were installed and were <br /> completed on April 5, 1995. Soil samples from the exploratory borings for each new <br /> well were capped, labeled, and placed m an ice chest under chain-of-cushy for transport <br /> to a California Certified Laboratory. The soil samples were tested for Total Petroleum <br /> Hydrocarbons as Diesel (TPH-D) using EPA method 3550/5015 modified, for Total <br /> Petroleum Hydrocarbons as Gasoline UPH-G) using TEPA method 5030/8015, and for <br /> benzene, ethylbenzene, toluene, and xylenes (BTEX) using EPA method 503018020. <br /> Soils encountered in the three borings consisted of interbedded fine-grained materials <br /> ranging from silty sands to sandy silts to the depths explored. from the surface, the soils <br /> consist of sandy silt (ML) to a depth of about 15 feet below ground surface (bgs). Silty <br /> sand (SI) was logged between the depths of 15 feet bgs to 30 feet bgs. Sandy silt (ML) <br /> was logged between 30 feet bgs and 65 feet bgs with increasing amounts of sand between <br /> 65 feet bgs and 80 feet bgs. A coarse, poorly-graded medium sand (SP) was encountered <br /> between 80 feet bgs and 85 feet bgs. On April 11, 1995, ESE personnel supervised the <br /> development of each new monitoring well by Spectrum Drilling Services. Well <br /> development consisted of surging the well and removal of fines using a steel bailer. <br /> site to supervise additional purging of <br /> ®ri April 14, 1995, ESE personnel returned to thepe p grog <br /> the wells by Automated Environmental Services. Well development and purging was <br /> completed by the recovery of clear ground water after 60 gallons had been removed from <br /> UST-2, 60 gallons from LIST-3, and 45 gallons from LIST-4. A survey of the top of <br /> acasing elevations of all wells onsite was made by frame Surveying & Mapping, of Davis, <br /> California. Top of casing elevations ranged from 27.64 feet to 30.15 feet relative to City <br /> of Stockton Benchmark No. 191. <br /> Quarterly ground water monitoring and sampling has continued in wells UST-1 through <br /> UST-4 since May 16, 1995. At the request of the SJCEHD, ESE installed a shallow <br /> ground water monitoring well designated as UST-5 on June 13, 1996. The findings for <br /> UST-5 were reported by FSE in the Second Quarter 1996 Ground Nater Monitoring <br /> Report. The following section describes the most recent results of quarterly moriitoizng <br /> and sampling. <br /> f 169254=gtriy rpt\4g06 rpt 3 Ennrmwwaal Scicnee&Fngkeedng.Inc <br />