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KIP 19 M_® Mr. Bruce Dickerman .i May 21, 1991 VIRUNN�ENTA �i Page 2 EN PERMIT 1 SEt2VICES property. The station, which was identified as Jim Thorpe Oil, appears to have occupied that portion of the site from sometime prior to 1933 until 1979, when building department records indicate that it was demolished. Stockton Fire Department records show that underground storage tanks (USTs) located on the site were also removed in 1979. No records were found regarding the location(s), quantity, sizes or condition of the former USTs, nor were any records found indicating that the USTs had leaked or otherwise impacted soils underlying the property. According to Mr. Brian Schmidt of the San Joaquin County Flood Control Department, ground water occurs approximately 60 to 70 feet below the subject property. The findings of the preliminary environmental assessment are described in the Law Environmental, Inc. report titled: "Phase I Preliminary Environmental Assessment, 502-510 North Wilson Way, Stockton, California" dated October 25, 1990. A supplemental soil vapor survey was performed on January 10, 1991 to evaluate the potential for significant soil contamination at the site. As noted in Law Environmental's Phase II Environmental Site Assessment report dated February 25, 1991 the soil vapor survey encountered very tight soil conditions at the site; consequently, four of the nine total sampling locations yielded insufficient soil gas for analysis. One soil vapor sample collected near the former UST location (as identified by a local resident) contained 31 parts per million of total petroleum hydrocarbons as gasoline (TPH/G). Field Activities Hollow stem auger equipment will be used to drill five borings to a depth of approximately 20 feet. Soil samples will be collected for field screening and laboratory analysis. Underground Service Alert (USA) will be contacted prior to drilling. Soil samples will be collected at 5-foot intervals or at significant changes in soil type using a California modified split-spoon sampler or equivalent, and will be retained in six-inch- long brass tubes. Soils encountered in the borings will be logged by a geologist according to the Unified Soil Classification System. Soil samples will be screened in the field using an HNu photoionization detector; the soil sample showing the highest relative TPH concentration in each boring will be preserved for analysis. The ends of the brass sample tubes selected for laboratory analysis will be covered with teflon liners, plastic end caps, wrapped with duct tape and placed on ice in a thermally insulated cooler. Chain of custody documents will accompany the selected soil samples to the California certified BC Analytical Laboratory. Downhole drilling equipment will be steam cleaned prior to use and between borings. Soil sampling equipment will be washed in an Alconox soap solution after each use. All drill cuttings and wash water will be placed into D.O.T. approved watertight 55-gallon drums pending the receipt of laboratory analyses. Soil borings will be grouted to the surface and holes in the asphalt will be patched.