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f 404 WEST FREMONT STREET WKA No, 1628 .09 August 31 , 2001 - Page 5 below grade during drilling. One soil sample collected at 15 feet below grade from each boring was tested and revealed TPHg concentrations of 0.2 mg/kg in the sample from boring B 1 and r 11 28 . 6 mg/kg in the sample from boring B2. � >a .� In addition to the soil borings, AGS deepened the existing excavation and obtained soil samples i . . S 1 and S2 at depths of 14 and 12 feet, respectively. Test results revealed TPHg concentrations of 21241 mg/kg in sample S 1 and 2. 1 mg/kg in sample S2. Test results of a water sample collected from well MW 1 sometime between October 29 and November 11 , - 1986, revealed a TPHg concentration of 11 .58 mg/1 (11 ,580 ug/L) and a benzene concentration of 1 .539 mg/1 (1 ,539 ug/L) Soil samples 546- 1 , 5- 16-2, 5-18-3, and 5- 18-5 were collected during additional excavation of ! contaminated soil on January 14, 1987. The samples were collected from depths of 16 and 18 feet. Test results revealed TPHg concentrations ranging from 0. 8 mg/kg to 596 mg/kg. _ The excavation was reportedly deepened on July 29, 1987, to a depth of approximately 22 feet. 1 No record of soil sampling during this excavation was found on file with the SJCEHD. The excavation was reportedly backfilled with clean imported soil and the contaminated soil was Llstockpiled on-site. On January 13, 1988 , a representative of AGS visited the site and used a portable soil vapor laboratory to evaluate the lateral extent of hydrocarbon contamination in both the soil and ground water. Samples collected during the soil vapor investigation reported no detectable levels of - _, BTEX (Benzene, Toluene, Ethylbenzene, or Xylenes) above a detection level of 2 parts per million (ppm). Results of the soil vapor survey are included in an AGS report dated March 15, 1988, A January 11 , 1991 AGS letter to Crystal Creamery reported that a composite sample of stockpiled soils had been analyzed for TPHg and BTEX. Results of the laboratory tests were j below detection levels; however the stockpiled soils were removed at the request of Crystal Creamery and transported to Holt Dump near Stockton. I Inwo.E Q W1u L .c E, nssaciATrS WC.