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February 11, 1993 Working To Restore Nature BP Oil Facihty No 11191,Stockton,California 1.2 Site Location and Description I BP Oil Facility No 11191 is located on the northwest corner of the intersection of East Hammer Lane and West Lane in Stockton, California The site is presently an operating retail service station with underground fuel storage tanks and no underground used-oil tank. Plate 2 shows the layout of the site and the locations of existing underground storage tanks and associated piping and dispenser islands as well as other pertinent site features I1.3 Sensitive Repeptor Survey A sensitive receptor survey and existing well search were performed to identify nearby environmental elements and land uses that may be affected by the existing BP Oil site or affect the subsurface conditions at the site. A copy of the completed sensitive receptor survey form and the results of the well survey are presented. in Appendix A 2.0 FIELD WORK The procedures and methods used during field activities are discussed below, and a description of the dulling and sampling procedures is presented in Appendix B. RESNA performed the work in accordance with our work plan (dated October 13, 1992) for the subject site. Permits are presented in Appendix C 2 1 SQil Borings and Sampling On December 2 and 3, 1992, four exploratory borings were dulled at the site All drilling I activities were performed by Kvilhaug Well Drilling and Pump Company, Inc of Concord, California using a truck-mounted Mobile B-53 drilling ng Soil borings were dulled using 7 25- inch-diameter hollow-stem-augers to depths of approximately 46 5 feet below grade Borings B- i and B-2 were drilled in the vicinity of the underground fuel storage tanks Borings B-3 and B- 4 were drilled southwest of the dispenser islands and associated piping All borings were backfilled to grade with neat cement using the tremie pipe method. The locations of the soil borings are shown in Plate 2 Boring logs were prepared using the Unified Soil Classification System including a description of soil characteristics such as color, moisture, consistency, and field readings using an organic Ivapor meter The Boring Logs are included as Appendix D 3.0 ANALYTICAL METHODS All laboratory analyses of soil samples were performed by a California-certified analytical laboratory, using standard test methods of the U.S Environmental Protection Agency (EPA) and the California Department of Health Services (DHS) PACE Laboratories, Inc of Novato, ICalifornia analyzed selected soil samples Selected soil samples from the borings were analyzed for the following Purgeable fuel hydrocarbons as gasoline, equivalent to total petroleum hydrocarbons as gasoline (TPHg), using EPA Methods 5030/8015 (modified) 17M of 2