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Advanced GeoEnvironmental, Inc. -. 22 April 2003 AGE-NC Project No. 01-0886 Ms. Vicki McCartney San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor Stockton, California 95202 Subject: Site Assessment Work Plan -Addendum Former BLUE STAR GASOLINE 4040 East Main Street, Stockton, California Dear Ms. McCartney: At the request of Mr.Khalid Amber,Advanced GeoEnvironmental,Inc.has prepared this addendum to Site Assessment Work Plan, dated 17 March 2003, for the property located at 4040 East Main Street,Stockton,California(Figure 1).The original scope of work included the advancement of one exploratory soil boring to collect and analyze soil samples; additional borings may be advanced, if necessary and with approval by the San Joaquin County Environmental Health Department(EHD) (Section 3.2). However, in a letter dated 04 April 2003, the EHD requested the establishment of a minimum of three soil borings to collect and analyze grab ground water samples as well as soil samples.Therefore,two additional soil borings will be advanced during the initial site investigation.; the proposed probe boring locations are illustrated in Figure 2. The three soil borings will be advanced to a minimum of 65 feet below surface grade for the collection of soil and grab ground water samples. Soil collection and analytical procedures were discussed in Section 3.2 of the original Site Assessment Work-Plan. Ground water samples will be collected using a Geoprobe water sampling assembly. The water samples will be collected into properly-labeled 40-m1 volatile organic analysis (VOA) vials, delivered in a properly-chilled container to a State of California Department of Health Service-Certified laboratory and analyzed for the same chemical constituents listed in Section 3.2. Upon approval of the work plan,AGE will submit all drilling permits and necessary application fees to the EHD. 837 Shaw Road,Stockton,California 95215 Telephone(209)467-1006 FAX(209)467-1118