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Lot ADDITIONAL SOIL AND GROUNDWATER INVESTIGATION WORK PLAN Raymond Investment Corporation 730 E. Channel Street Stockton, California a. 1.0 INTRODUCTION Lo This work plan was prepared by Condor Earth Technologies, Inc. (Condor) to describe proposed soil and groundwater investigation activities at 730 E. Channel Street(Site) in Stockton, California (Figures 1 and 2, Appendix A). The purpose of the work is to investigate the lateral and vertical extent of petroleum hydrocarbon contamination related to an underground storage tank (UST) formerly located at the Site. The proposed work will include installing one groundwater monitoring well and advancing eight direct push borings to collect soil and groundwater samples for laboratory analyses. Condor prepared this work plan at the request of Ms. Beverly Garcia of Raymond Investment Corporation (property owner) and as directed by Ms. Victoria McCartney of the San Joaquin County Environmental Health Department (SJCEHD) in her letter dated February 22, 2006. w.. All work conducted by Condor will be under the supervision of a California Certified Hydrogeologist. This work plan includes project background information, a description of the field, laboratory, and �,. reporting procedures proposed to conduct the work, and a project schedule. 2.0 PROJECT BACKGROUND r.r 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, soil samples were collected from locations La directed by the SJCEHD. Laboratory analytical results indicated that total petroleum hydrocarbons quantified as gasoline (TPH-G), L. total extractable petroleum hydrocarbons quantified as motor oil (TEPH-MO), and total extractable 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 v 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 LA laboratory analyses were described by Condor in the Underground Storage Tank Removal Report dated May 14, 2003. In a letter dated November 4, 2003, to Ms. Beverly Garcia, Ms. Victoria McCartney of the SJCEHD directed Raymond Investment Corporation to submit a work plan to investigate the lateral and vertical extent of contamination at the Site. Condor prepared the Soil and Groundwater Investigation Work Plan, dated February 19, 2004, which was approved by SJCEHD with modifications in a letter dated March 17, 2004. Condor conducted soil and groundwater investigation activities at the Site on May 5 and 6, 2004. Laboratory analytical results of the soil and groundwater samples collected during the investigation indicated that the soil and groundwater at the Site were impacted by TPH-G and TEPH-D at some �` locations. Condor described the results of the investigation in the Soil and Groundwater Investigation . 1.w A CONDOR