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V V L, ADDITIONAL VAPOR AND GROUNDWATER MONITORING WELL WORK PLAN ,., Raymond Investment Corporation 730 E. Channel Street Stockton, California 1.0 INTRODUCTION +-+ This work plan was prepared by Condor Earth Technologies, Inc. (Condor) to describe proposed soil vapor monitoring and groundwater monitoring well installation activities at 730 E. Channel Street (Site) in Stockton, California (Figures 1 and 2, Appendix A). The purpose of the work is to install monitoring wells in locations that fill data gaps and improve the accuracy of interpretation for the lateral and vertical extents of petroleum hydrocarbon contamination related to an underground storage tank (UST) formerly located at the Site. The proposed work will include installing seven groundwater monitoring wells and r. three soil vapor monitoring wells, and collecting 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 Lo Environmental Health Department(SJCEHD)in her letter dated May 12, 2009. All work conducted by Condor will be under the supervision of a California Certified Engineering Geologist. 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. La 2.0 PROJECT BACKGROUND On April 29, 2003, Oil Equipment Services removed one UST and associated piping at the Site. Soil staining and petroleum odors were noted in the excavation and excavated soil. Following removal of the I" UST,piping, dispenser, and filter, soil samples were collected from locations directed by the SJCEHD. 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 petroleum hydrocarbons quantified as diesel (TEPH-D) were detected at concentrations of 75 milligrams per kilogram (mg/kg), 15,000 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 LA laboratory analyses were described by Condor in the Underground Storage Tank Removal Report dated May 14, 2003. , La 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 extents of contamination at the Site. Condor prepared the Soil and Groundwater Investigation Work La 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 Ud some locations. Condor described the results of the investigation in the Soil and Groundwater �a CONDOR Lo