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N.04 ASSOCIATESC- VVAT4L I N C . 4 ADDENDUM TO SITE CONCEPTUAL MODEL AND CORRECTIVE ACTION PLAN Diesel Performance 2804 Fremont Street LW Stockton, California ATC Project No. 54.62577.0001 LW 1.0 INTRODUCTION ATC Associates Inc. has prepared this addendum to the Site Conceptual Model and Corrective Action Plan, dated January 5, 2004, on behalf of Diesel Performance for the facility located at 2804 Fremont Street in Stockton, California (Figure 1). This addendum was prepared at the 16. request of the San Joaquin County Environmental Health Department (SJC/EHD) and addresses comments in their correspondence dated February 17, 2004. 1.1 Site Location The site is located on the south side of East Fremont Street in the City of Stockton, California, as shown on Figure 1. The location is a commercial/industrial and residential area. The site is currently occupied by Diesel Performance. 1.2 Backsround Information �- In February 1987, SEMCO removed and disposed of one 3,000-gallon unleaded gasoline UST, associated piping, and fuel dispenser from the location shown on Figure 2. A soil sample collected from 13 feet below ground surface(bgs) contained elevated concentrations of petroleum hydrocarbon contaminants. The excavation was subsequently backfilled and resurfaced. On July 23, 1997, an ATC geologist supervised the advancement of five soil borings ranging in depth from 6 to 46 feet bgs. The soil borings were advanced using a truck mounted GeoprobeO narrow diameter rig employing direct push technology. Petroleum hydrocarbons were detected in soil samples submitted for laboratory analyses. Site activities are summarized in ATC's Summary Report for Subsurface Investigation, dated October 20, 1997. On September 25, 1998, ATC personnel supervised the advancement of soil boring MW1 at the site to a depth of approximately 65 feet bgs to evaluate groundwater for the presence of petroleum hydrocarbons. The soil boring was completed as a groundwater monitoring well and on September 28, 1998 the well was developed and sampled. Analytical data indicated that soil and groundwater samples contained detectable concentrations of petroleum hydrocarbons. Field `-' activities and analytical results are detailed in ATC's Summary Report of Additional Subsurface �- Investigation, dated January 8, 1999, S:1Environmental162577rSCMCAPAdddoe 1 LW