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':f 404 WEST FREMONT STREET <br /> WKA No. 1628.09 <br /> August 31, 2001 <br /> Page 5 <br /> below grade during drilling. One soil sample collected at 15 feet below grade from each boring <br /> �--� was tested and revealed TPHg concentrations of 0.2 mg/kg in the sample from boring B 1 and <br /> 28.6 mg/kg in the sample from boring B2. <br /> In addition to the soil borings, AGS deepened the existing excavation and obtained soil samples <br /> +' S 1 and S2 at depths of 14 and 12 feet,respectively. Test results revealed TPHg concentrations of <br /> 2,241 mg/kg in sample S 1 and 2.1 mg/kg in sample S2. Test results of a water sample collected <br /> .;r.� from well MW1 sometime between October 29 and November 11, 1986,revealed a TPHg <br /> concentration of 11.58 mg/1 (11,580 ug/L) and a benzene concentration of 1.539 mg/l (1,539 <br /> ;.� ug/L) <br /> =a Soil samples S-16-1, S-16-2, S-18-3, and S-18-5 were collected during additional excavation of <br /> contaminated soil on January 14, 1987. The samples were collected from depths of 16 and 18 <br /> feet. Test results revealed TPHg concentrations ranging from 0.8 mg/kg to 596 mg/kg. <br /> The excavation was reportedly deepened on July 29, 1987, to a depth of approximately 22 feet. <br /> No record of soil sampling during this excavation was found on file with the SJCEHD. The <br /> excavation was reportedly backfilled with clean imported soil and the contaminated soil was <br /> stockpiled on-site. <br /> On January 13, 1988, a representative of AGS visited the site and used a portable soil vapor <br /> laboratory to evaluate the lateral extent of hydrocarbon contamination in both the soil and ground <br /> water. Samples collected during the soil vapor investigation reported no detectable levels of <br /> BTEX (Benzene, Toluene, Ethylbenzene, or Xylenes) above a detection level of 2 parts per <br /> million(ppm). Results of the soil vapor survey are included in an AGS report dated March 15, <br /> ;1 1988. <br /> A January 11, 1991 AGS letter to Crystal Creamery reported that a composite sample of <br /> stockpiled soils had been analyzed for TPHg and BTEX. Results of the laboratory tests were <br /> below detection levels; however the stockpiled soils were removed at the request of Crystal <br /> Creamery and transported to Holt Dump near Stockton. <br /> i - <br /> .` <br /> INK <br /> �W..r.r f°:-b•WAR <br />