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I SITE ASSESSMENT WORK PLAN Geweke Land Development & Marketing 16 South Cherokee Lane ILodi., California INTRODUCTION In accordance with a request from Mark Geweke of Geweke Land Development & Marketing (GLDM) , GEOLOGICAL AUDIT SERVICES, INC. I (GeoAudit) has prepared this work plan to complete the soil contamination site assessment at 16 South Cherokee Lane, Lodi, California (the site) . The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2 . The purpose of this work plan is to assess the extent of soil I impacted by petroleum hydrocarbons and to further define upgradient groundwater quality in compliance with Cleanup and Abatement (C & A) Order No. 93-701 issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) dated 15 March 1993 . ' BACKGROUND The site is located in an light industrial/commercial area of Lodi, California (see Figure 1) . The property is located on Cherokee Lane, which was formerly State Highway 99 . The property was the site of a former gasoline station. The fueling facility at the site I consisted of two 10, 000 gallon, one 6, 000 gallon fuel tanks and their appurtenant piping/dispensers. These tanks and an additional 1, 000 gallon waste oil tank, were removed in 1985. Evidence of an ' unauthorized release was encountered during the tank removal. The impact of this release on the vadose and saturated zones was I initially investigated by J.H. Kleinfelder, Inc. (Kleinfelder) . in the latter portion of 1985. In conjunction with this investigation, Kleinfelder drilled four soil borings and subsequently converted these borings to groundwater monitoring wells (MW-1 through MW-4) . ' Dissolved petroleum hydrocarbons were detected in the groundwater. Moderate levels of hydrocarbon contamination were encountered in soil samples at several isolated depths. ' A subsequent investigation was performed by Brown and Caldwell Consultants (BCC) . ,Five soil borings were drilled (GL-1 through GL- 5) in February 1986 followed by the installation of an additional monitoring well (MW-5) in July of the same year. Two of the soil borings were drilled in the location of the former tanks (GL-2 and GL-3) . Only moderate levels of hydrocarbon contamination were ' detected in samples from these borings. However, no samples from a depth of greater than 15 feet were analyzed. A resampling of the groundwater monitoring wells indicated that the highest concentration of dissolved hydrocarbons occurred in MW-4 (BCC report dated July 1990) . I