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August 4, 1998 FLUOR DANIEL GTI 'N ✓ Mr. Bob DeNinno The Southland Corporation 10220 S.W.Greenburg Road Portland, Oregon 97233 Subject: Addendum to the Work Plan for Additional Subsurface investigation Southland Store No. 19976 1399 North Main Street Manteca, California Fluor Daniel GTI Project 103998-630104 Dear Mr. DeNinno: Fluor Daniel GTI, Inc-submits this letter as an addendum to the Additional Site Assessment Report at7d Work Plan for Additional Subsurface Investigation dated June 5, 1998, prepared for Southland Store No. 19976 located at 1399 North Main Street in Manteca,California (Figures 1 and 2,Attachment 1). s ' The following modifications to the above mentioned Work Plan are submitted to the San'Joaquin County Environmental Health Division (SJCEHD) for approval. These modifications are made as requested in the letter from the SJCEHD, dated June 24, 1998, and the telephone conversation with Mrs. Carol Oz of the SJCEHD. The proposed monitoring well located at the northeast corner on the Work Plan map will be relocated to the area east of GP-3 (Figure 2). A dual-nested well will be constructed at this location. The shallower well will be screened from 10 to 30 feet below ground surface (BGS),and the deeper screened interval will be _ from 45 to 50 feet BGS or deeper depending on site conditions. The proposed monitoring well in northwest area of the Work Plan map will be relocated to an area between GP-1 and the former underground storage tanks(USTs) (Figure 2). Once the proposed monitoring wells have been constructed a professional survey team will survey the top of casing (TOC)for each well relative to mean sea level. The surveyors will identify the local point of reference. All survey information will be included in the well installation report at the conclusion of all work related to the Work Plan. A well survey will be conducted to locate all domestic, municipal,agricultural and industrial supply wells within a 2,000 foot radius of the site. Fluor Daniel GTI personnel will contact the Department of Water Resources and the City of Manteca municipal water suppliers in order to determine pertinent well location and construction. If needed a door to door investigation will be conducted to identify wells within the 2,000 foot radius of the site. Quarterly monitoring and sampling will be conducted after the wells are completed:-Quarterly groundwater samples wHI be analyzed for BTEX, and TPH-G using Environmental Protection Agency(EPA.) methods 8020/modified 8015, and for oxygenates: methyl-tent-butyl-ether(MTBE),tert-butanol (TBA), diisopropyl ether(DIPS), ethyl-tort-butyl ether(ETRE), and tert amylmothyl ether(TAME) using EPA method 8260. 757 Arnold Drive, Suite D / Martinez, CA 94553 USA X510) 370-3990 FAX (510) 370-3991 • s