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CAMBRIA. August 14, 1997 Mr.Ron Rowe San Joaquin County Public Health Services Environmental Health Division 304 East Weber Ave.,3rd Floor Stockton,California 95201-0388 Re: Investigation Work Plan Addendum Shell Service Station 1071 North Main Street Manteca,California WIC#204-4728-0502 Cambria#24-323-7 i Dear Mr. Rowe: As discussed during our July 17, 1997 meeting, Cambria Environmental Technology,Inc. (Cambria) is submitting this work plan addendum for a subsurface investigation at the site referenced above on behalf of Shell OilProducts Company. In our meeting, you requested that we install three wells to define the extent of hydrocarbons in soil and assess whether hydrocarbons are in ground water beneath the site. Our proposed scope of work for this investigation is described below. PROPOSED SCOPE OF WORK The only areas where elevated hydrocarbon concentrations were detected in soil following tank and piping upgrades were the western dispenser and the east side of the former underground storage tanks where the product piping entered the tank pit. We will install one well at each of these two locations. We will install a third well at the northeast corner of the property to determine ground water flow CAMBRIA direction and gradient and to further define the extent of any hydrocarbons that are detected in ground ENVIRONMENTALwater in the two source area wells. Well locations are shown on Figure 1. TECHNOLOGY,INC. The specific tasks to be performed include: 1144 65TH STREET, Utility Location: Cambria will notify Underground Service Alert of our drilling activities to identify SUITE B utilities in the site vicinity. OAKLAND, Site Health and Safety Plan: We will prepare a comprehensive site safety plan to protect site workers. CA 94608 The plan will be kept on site during site activities and signed by each site worker. PH:(510)420-0700 FAX:(510)420-9170 i I