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I� T II� 22 September 1997 ' AGE-NC Project No 95-0167 Page 2 of 6 ' Joaquin County Flood Control District and Water Conservation District, and information obtained from the PHS-EHD from monitoring wells at surrounding sites Furthermore, PHS-EHD records indicate that the highest observed ground water elevation at the property was 10 feet bsg, measured ' in 1986 During the initial site assessment conducted in September 1995, ground water was measured at approximately 25 feet bsg While during the site assessment in April 1997,ground water was measured at approximately 15 feet bsg Thep revailing ground water flow direction in central Stockton is generally toward the northeast, however, localized ground water flow direction may vary during winter/summer cycles and tidal fluctuations Ground water is considered to be of beneficial use and is utilized for domestic, industrial and commercial purposes I' 3.0. PROCEDURES 3 1 PROBING AND SAMPLING A total of eight soil probe borings (P1 through P8) were advanced at the site, under the observation of a representative of the PHS-EHD On 19 September 1995, probe boring P 1 was advanced north of the former UST area, probe boring P2 was advanced near the center of the former UST ' excavation, and probe boring P3 was advanced near the former dispenser location Each of these boring were advanced to a depth of 25 feet bsg ' On 21 April 1997, P4 was advanced in the City of Stockton right-of-way in Fremont Street Four additional soil probe borings were advanced on the site, in the vicinity the former UST, including ' probe boring P7, which was advanced under the building on the site Each of these probing were advanced to a vertical depth of 15 feet bsg Locations of the soil probe borings are illustrated on Figure 2 ' Soil samples were collected from each boring at five-foot intervals, beginning at various depths using a Geoprobe soil sampling assembly and four brass sleeves Samples were collected using a ' 2 15-inch diameter,two-foot long, piston-type sampler loaded with four pre-cleaned 1 375-inch by 6-inch brass sleeves The sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to prevent cross-contamination After collection, the ends of the ' second brass sleeve were covered with Teflon sheets, capped and sealed with tape Samples were _ placed in a chilled container under ice and transported to McCampbell Analytical,Inc , (MAI)under ' chain-of-custody • Two soil samples were transported to an independent microbiologist, Mr A Keith Kaufmann of Culver City, California, and analyzed for physicochemical properties and microbiological 1 Advanced GeoEnvironmental,Inc 1