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SOIL AND GROUNDWATER INVESTIGATION REPORT ' Raymond Investment Corporation 730 E. Channel Street Stockton, California 1.0 INTRODUCTION This report was prepared by Condor Earth Technologies, Inc (Condor) to describe soil and groundwater I investigation activities conducted on May 5 and 6, 2004, at 730 E Channel Street (site) in Stockton, California (Figures 1 and 2, Appendix A) The purpose of the work was to investigate the lateral and vertical extent of petroleum hydrocarbon contamination related to an underground storage tank(UST) and associated piping formerly located at the site The work included advancing six direct push borings to collect soil and groundwater samples This report was prepared at the request of Beverly Garcia of IRaymond Investment Corporation(property owner) All work was conducted under the supervision of a California Registered Geologist This report includes u project background information, a description of the fieldwork and laboratory analytical results, conclusions, and recommendations 2.0 PROJECT BACKGROUND On April 29, 2003, Oil Equipment Services removed one UST and associated piping at the site The UST was discovered as part of a Phase II Environmental Site Assessment performed in May, June, and September 2002, and completed for the City of Stockton Department of Housing and Redevelopment In lie a letter dated September 27, 2002, Michelle Sterm Le of the San Joaquin County Environmental Health Department(SJCEHD)required removal or in-place closure of the UST Condor representatives were on site to make field observations and collect soil samples following removal of the UST and the associated piping Dina Abate of the SJCEHD was on site to observe the UST and piping removal activities and the collection of soil samples The UST was an approximately 1,000-gallon capacity single-wall-steel tank 12 feet long and 4 feet in diameter The excavation associated = with the UST was approximately 6 feet by 15 feet by 6 feet deep Soil staining and petroleum odors were noted in the excavation and excavated soil Groundwater was not encountered in the excavation Approximately 85 feet of piping associated with the UST, a dispenser, and a diesel filter were also removed Following removal of the UST, piping, dispenser, and filter, soil samples were collected from locations directed by Ms Abate The tank excavation was backfilled with pea gravel Laboratory analytical results indicated that petroleum hydrocarbons were not detected at or above the laboratory reported detection limits in the soil samples collected from the north end of the UST excavation, from beneath the dispenser, and from two piping trenches Total petroleum hydrocarbons quantified as gasoline (TPH-G), total extractable petroleum hydrocarbons quantified as motor oil (TEPH- MO), and total extractable petroleum hydrocarbons quantified as diesel (TEPH-D) were detected at I 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 and TEPH-D were also detected at concentrations of 2 0 and 200 mg/kg, respectively, in the soil sample collected from beneath the location of the diesel filter The UST removal activities and the results of the laboratory analyses were described by Condor in the Underground Storage • Tank Removal Report dated May 14, 2003 Qn,tm- 1� I as ' - I �C� CONDOR