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�.. `/ SOIL GAS INVESTIGATION WORK PLAN Raymond Investment Corporation 730 E. Channel Street Stockton, California May 24,2006 Condor Project No.38491 L. 1.0 INTRODUCTION This is a work plan for conducting a Soil Gas Investigation at the former Stockton Metropolitan Area LN Regional Transit facility (Site) located at 730 E. Channel Street in Stockton, California (Figures 1 and 2, Appendix A). Condor Earth Technologies, .Inc. (Condor) prepared this work plan at the request of Ms. Beverly Garcia of Raymond Investment Corporation (property owner), pursuant to a directive from the +� San Joaquin County Environmental Health Department (SJCEHD). The objective of the work described in this work plan is to evaluate potential contaminant exposure �. levels associated with soil gas from a former underground storage tank(UST) at the Site. This work plan was developed using information contained in the California Environmental Protection Agency Department of Toxic Substances Control (DTSC) and the California Regional Water Quality Control Board, Los Angeles Region (LARWQCB) Advisory - Active Soil Gas Investigations Advisory, dated January 28, 2003 (Advisory). This work plan includes Site background information, health and safety requirements, and descriptions of the proposed fieldwork, laboratory analyses, and human health screening evaluation methods. 2.0 SITE DESCRIPTION r... The Site is owned by Raymond Investment Corporation and is located in downtown Stockton, California at 730 E. Channel Street and adjacent to Grant Street and Weber Avenue (Figures 1 and 2, Appendix A). The Site was used as a local public passenger bus maintenance facility and administrative office with r. rooms located in the basement (Figure 3, Appendix A). The basement was formerly designated as a nuclear fallout shelter. There are currently surrounding streets and commercial properties located on the north, south, east, and west Site boundaries. An overhead utility pole bearing electrical and cable lines is located along the western Site boundary. .2.1 . SITE BACKGROUND On April 29, 2003, Oil Equipment Services removed one underground storage tank (UST) and associated piping at the Site. Soil staining and petroleum odors were noted in the excavation and excavated soil. Following removal of the UST, piping, dispenser, and filter area, soil samples were collected from locations as directed by the SJCEHD. r Lr Laboratory analytical results indicated that total petroleum hydrocarbons quantified as gasoline(TPH-G), total extractable petroleum hydrocarbons quantified as motor oil •(TEPH-MO), and total extractable La petroleum hydrocarbons quantified as diesel (TEPH-D) were detected at concentrations of 75 milligrams per kilogram (mg/kg), 18,000 mg/kg, and 2,400 mg/kg, respectively, in the soil sample collected from beneath the south end of the UST excavation at a depth of eight feet below ground surface (bgs). TPH-G CONDOR