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1� I� ADR Environmental Group, Inc. 1425 River Park Drive,Suite 201 • Sacramento,CA 95815 (888) 622-3734 • (916) 921-0600 • FAX (916) 648-6688 October 17, 2002 Ms. Margaret Laborio San Joaquin County Environmental Health Department 304 East Weber Ave., Third Floor Stockton, California 95202 Subject: Work Plan to Perform Subsurface Investigation Former Winston Tire Store 1648 Hammer Lane Stockton, California Dear Ms. Lagorio: ADR Environmental Group, Inc. (ADR) is pleased to present this work plan to perform a subsurface investigation at the former Winston Tire Store (see Plate 1) located at the above referenced address (subject Property). This work includes the drilling and collection of subsurface soil samples from selected locations at the subject Property for laboratory analysis. Background The subject Property has been associated with Winston Tires automotive tire repair and sales activities since the early 1990s. ADR understands that Winston Tires vacated the property in September of 2002. Based on the historical usage of the subject Property a potential exists that the site has been impacted by past releases of hazardous materials into the subsurface soils. A subsurface soil investigation was recommended by ADR to assess if the past practices or releases have environmentally impacted the site. Scope of Services The work described in this work plan is intended to assess the presence or absence of petroleum constituents, volatile organic compounds (VOCs), and selected metals at strategic locations underlying the subject Property. The proposed scope of services is not intended to delineate the extent of contamination, if any. The intended scope of services is outlined below. Task I: Prepare a site Health and Safety Plan for the project. As part of this task, ADR will also contract with accredited laboratories, submit required permits and schedule field activities. Task II: ADR will,advance soil borings (Plate 2) at the following locations: five boring will be drilled to 15 below ground surface (bgs) in the area of the hydraulic lifts, three soil borings will be advanced to 20 feet bgs in the vicinity of the former oil/water separator, and one soil boring will be drilled to 5 feet bgs next to the garage floor drain. To minimize soil wastes, the borings will be advanced using direct push methods. Soil samples will be collected at 5-foot or less vertical intervals from each boring. Recovered soil samples will be Due D111gence and Risk Management Services Nationwide