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Work Plan Addendum FLAG CITY CHEVRON 6421 Capitol Avenue, Lodi, California 1.0. INTRODUCTION At the request of Mr Richard Bokides of the Bokides Family Limited Partnership, Advanced GeoEnvironmental, Inc (AGE) has prepared this work plan addendum (WPA) for additional assessment at 6421 Capitol Avenue, Lodi, California(site) The location of the site is illustrated on Figure i A plan of the site is illustrated on Figure 2 Background information for the site was previously included in the Problem Assessment Report, dated 20 June 2000, prepared by AGE Tlus WPA is in accordance with a directive letter from the California Regional Water Quality Control Board(RWQCB)-Central Valley Region,dated 22 August 2003 and is a continuation of the Work Plan Addendum, dated 09 May 2002 A copy of the RWQCB. directive-letter is included in Appendix A Between the March 2002 and the September 2003 ground water monitoring events, significant concentrations of dissolved MTBE were detected from well MW-8A (screened 40 to 50 feet bsg) after nine consecutive quarters of being non-detect(Table 1) Due to the repeated detection of MTBE at well MW-8A, three soil bonngs (P-36, P-37 and P-38) were advanced near MW-8 and grab . ground water samples collected during October 2002 to further assess the above MTBE-impact (Table 2) However,laboratory analysis of the grab ground water samples collected from P-36,P-37 and P-38 only detected TPH-d and low concentrations ofBTEX constituents(toluene and xylenes), MTBE was not detected in any of the above grab ground water samples The laboratory further indicated that the detection of TPH-d was not fuel related, but possibly the result of some type of plastic or pesticide Because MTBE was not detected during the October 2002 site assessment activities, and because MTBE has continued to be detected from well MW-8A,AGE is proposing to advance four Geoprobe soil bonngs at the site for collection of soil and ground water samples to assess the migration pathway of MTBE-impacted ground water detected at MW-8A(Table 1) Additionally,one(1)off- site Geoprobe soil boring is proposed to assess the area north of MW-8 on Banner Avenue (San Joaquin County right-of-way),between the McDonalds Restaurant property(6440 West Banner)and New West Petroleum (6437 West Banner Avenue) This work plan is prepared in accordance with California Regional Water Quality Control Board - Central Valley Region (RWQCB) guidelines for the investigation of underground storage tanks (UST) sites • Advanced GeoEnvironmentai,Inc.