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Addendum to Monitoring Well Installation Work Plan - July 2001 GREWAL'S MARKET 4100 East Fremont Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Rick Grewal of Grewal's Market, Advanced GeoEnvironmental, Inc. (AGE) has prepared this addendum to Monitoring Well Installation Work Plan -- Novenrher 1999, dated 18 November 1999, for drilling three soil borings and installing one additionalground water monitoring well at 4100 East Fremont Street, Stockton, California (site). Three soil borings will be advanced and one ground water monitoring well installed at the site to assess the horizontal extent of hydrocarbon-impacted soil and to assess the horizon talivertical extent of hydrocarbon-impacted ground water. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan addendum complies with a San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) letter directive, dated 16 May 2000, for further ground water investigation and has been prepared in accordance with guidelines established by the California Regional Water Quality Control Board - Central Valley Division (CRWQCB) for investigation of underground storage tank (UST) sites. Background information and a description of prior investigations at the site were included in PrelinlinatT Investigation And Evaluation Report, dated 27 September 1999. The lateral extent of the adsorbed and dissolved petroleum hydrocarbon plume appears to coincide with the margin of the area bound by wells MW-1, MW-2 and MW-3; the vertical extent of petroleum hydrocarbon-impacted ground water is not known at the site. Analytical results of soil samples collected during investigation to date are summarized in Table 1; analytical results of ground water samples are summarized in Table 2. Based on soil analytical and composition data obtained from the soil borings, cross sections A-A ' and B-B' (Figures 3 and 4) were constructed depicting the general subsurface soil composition and petroleum hydrocarbon concentrations at the site. 2.0. SCOPE OF WORK The lateral extent of adsorbed petroleum hydrocarbons and the horizontal/vertical extent of impacted ground water must be determined to comply with the 16 May 2000 PHS-EHD directive. Assessment activities will include the following tasks: • Permitting and pre-field work preparations; • Drilling and sampling; • Monitoring well installation and development; • Ground water sample collection and analysis; Advanced GeoEnvirnnmenoi,Ine.