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KLEINFELDER September 5, 2003 File No: 34067 SUBJECT: Workplan for Limited Site Investigation Proposed Costco Gas Station 1616 East Hammer Lane Stockton, California The purpose of the Limited Site Investigation is to evaluate if there are pre-existing environmental impacts at the proposed site for a Costco Gas Station. The Phase I Environmental Site Assessment (ESA) conducted by Kleinfelder indicated the potential for upgradient groundwater impacts from a car dealership and a former Winston Tire Store adjacent to the site. The site is currently a parking lot for the Costco Wholesale Store at 1616 East Hammer Lane (Plate 1). For this project, Kleinfelder proposes to conduct the Limited Site Investigation in three main tasks as follows: Task 1 Planning and Permitting Task 2 Phase II Field Investigation Task 3 Report of Findings Task 1 Planning and Permitting Prior to performing this proposed investigation, the Kleinfelder Project Manager will conduct a site visit to verify sampling locations and site access. hi addition prior to drilling, a drilling permit will be obtained from the San Joaquin County Environmental Health Department (SJCEHD). We will contact Underground Service Alert (USA) to notify utility companies with underground conduits in the site vicinity of planned investigation. We will also have the boring locations cleared by a private utility locator. This Workplan is supplemented by a site-specific Health and Safety Plan (HASP) prior to commencing the field investigation to identify potential hazards at the site, develop appropriate mitigation methods to minimize worker exposure, and prepare contingency plans for emergencies. Task 2 Limited Site Investigation Kleinfelder proposes to conduct the field investigation to evaluate if there are pre-existing petroleum-hydrocarbon impacts to soil and groundwater at the project site. A total of three soil borings are planned in the asphalt parking lot: two to a depth of 20 feet below ground surface (bgs) and one to 50 feet bgs (Plate 2). A truck-mounted, direct-push drilling rig will 34067 1 O 2003 Kleinfeldu,Inc.