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Work Plan Addendum - April 2001 Three B's Truck Plaza 14749 Thornton Road, Lodi, California 1.0. INTRODUCTION At the request of Mr Andy Zarakam of DIK Tracy Enterprises Inc , Advanced GeoEnvironmental, Inc (AGE) has prepared this work plan addendum, for additional cone penetrometer testing (CPT) on the site located at 14749 Thornton Road, Lodi, California The location of the site is illustrated on Figure 1, a plan of the site is illustrated on Figure 2 The enclosed work plan is being prepared as an addendum to Monitoring Well Installation Work Plan, dated 28 August 2000, which was for installation of five ground water monitoring wells and three CPT soil borings and was required by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD)by letter dated 14 January 1999 Based on ground water sampling data collected from the ongoing investigation, the horizontal extent of dissolved hydrocarbons in First Water is not fully defined north and west of the site while the vertical extent is not defined in any direction Therefore, AGE proposes six additional CPT soil borings to identify the principal ground water flow units underlying the site, to assess the hydrocarbon-impact on each identified flow unit, to complete the vertical and horizontal assessment of impacted ground water and to obtain information to properly design a ground water monitoring system This work plan addendum provides a description of the scope of work and procedures for CPT soil bonng advancement and grab ground water sample collection and analysis This work plan addendum is prepared in accordance with California Regional Water Quality Control Board(RWQCB) guidelines for the investigation of underground storage tanks (UST) sites Background information for the site was included in Monitoring Well Installation Work Plan, dated 28 August 2000, prepared by AGE 2.0. SCOPE OF WORK Based on the results of the_CPT Site Invesgnlrn -First Quarter 2221,the lateral and vertical extent of hydrocarbon-impacted ground water has not been determined and additional CPT borings are necessary to assess the lateral and vertical extent Based on ground water sampling data depicted in cross sectional views D - D' (Figure 3) and E - E' (Figure 4), the vertical extent of petroleum- impacted ground water extends at least 120 feet bsg in the area of P-11 and P-12 and is not fully defined in any direction, based on an isoconcentration map (Figure 5) depicting the approximate extent of dissolved TPH-g at the site on 09 March 2001, the horizontal extent of dissolved hydrocarbons in First Water(informally identified as ground water located between 12 and 34 feet bsg) is not fully delineated north, west and east of MW-3 and north, east and south of MW-6 To delineate the vertical and horizontal extent of petroleum-impact in ground water, additional assessment will require completion of the following tasks • Permitting and pre-field work activities, Advanced GeoFnvironmentai,Inc