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"A <br /> February 16 1992 Working To Restore Nature <br /> BP Oil Facility No. 11195, Lathrop,California. <br /> 1.2 Site Location and Description <br /> k:{ BP Oil Facility No. 11195 is located at 16500 South I-5 in Lathrop, California. The site is <br /> presently an operating service station with underground fuel storage tanks and one underground <br /> used-oil tank. Plate 2 shows the layout of the site and the locations of existing underground <br /> storage tanks and associated piping and dispenser islands. <br /> '== 1 Sensitive Ref&ptor Surve <br /> RESNA performed a sensitive receptor survey and existing well search to identify nearby <br /> environmental elements and land uses that may be affected by the existing BP Oil site or affect the <br /> subsurface conditions at the site. A copy of the completed sensitive receptor survey form is <br /> presented in Appendix A. <br /> 2.0 FIELD WORK <br /> F The procedures and methods used during field activities are discussed below, and a description of <br /> the drilling and sampling procedures is presented in Appendix B. Permits are presented in <br /> Appendix C. We performed the work in accordance with RESNA Industries, Inc. work plan for <br /> the site (dated October 13, 1992). <br /> 2.1 Soil Borings and SamVling <br /> On December 10 and 11, 1992, five exploratory borings were drilled at the site. Drillingactivities <br /> A rY g <br /> € were performed by Kvilhaug Well Drilling and Pump Company,Inc. of Concord, California. Soil <br /> borings were drilled using 7.0-inch-diameter hollow-stem-augers to depths ranging from 23.0 feet <br /> F-=tea to 24.5 feet below ground surface. Borings B-1 and B-2 were drilled in the vicinity of the <br /> Vi dispenser islands and associated piping, and borings B-3 and B-4 were drilled in the vicinity of the <br /> underground fuel storage tanks. Boring B-5 was drilled adjacent to the underground used-oil tank. <br /> The locations of the soil borings are shown in Plate 2. <br /> - 3 <br /> ' Boring logs were prepared using visual and manual methods and classified using the Unified Soil <br /> Classification System, and include a description of soil characteristics such as color, moisture, <br /> consistency, and field readings using a photoionization detector. The Boring Logs are included as <br /> z' Appendix D. <br /> =} 2.2 Monitoring Well Installation and Construction <br /> Soil borings B-I through B-5 were converted into monitoring wells MW-1 through MW-5, <br /> ,- respectively, in accordance with the installation procedures and construction details presented in <br /> Appendix B. The monitoring wells were constructed with clean, 2-inch-diameter, flush threaded, <br /> Schedule 40, polyvinyl chloride (PVC) blank casing and 0.020-inch slotted casing to depths <br /> ranging from 23.0 feet to 24.5 feet below grade. Well construction details are included in the <br /> -? Boring Logs presented in Appendix D. <br /> :.1 <br /> .•J <br /> i � 17052.01 2 <br /> rr:}a <br /> f"ra <br /> r_-_1 <br />