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Ld ♦./ Lr MONITORING WELL DESTRUCTION WORK PLAN L. Raymond Investment Corporation 730 E. Channel Street Stockton,California Li 1.0 INTRODUCTION L. This work plan was prepared by Condor Earth Technologies, Inc. (Condor) to describe proposed groundwater monitoring well destruction activities at 730 E. Channel Street(Site) in Stockton, California (Figures 1 and 2, Appendix A). The purpose of the work is to remove or abandon monitoring wells 6a located at the Site. The proposed work will includes destroying or abandoning eight groundwater — monitoring wells and 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 k. Investment Corporation (property owner) and as directed by Ms. Victoria McCartney of the San Joaquin County Environmental Health Department(SJCEHD)in her letter dated October 1$, 2012. 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. 2.0 PROJECT BACKGROUND On April 29, 2003, Oil Equipment Services removed one UST and associated piping at the Site. Soil Lr 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 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 laboratory analyses were described by Condor in the Underground Storage Tank Removal Report dated May 14, 2003. Lr Condor prepared the Sail 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 Report, dated June 1, 2004. Condor prepared the Monitoring Well Installation Work Plan, dated August 11, 2004, which was approved by SJCEHD in a letter dated August 25, 2004.Condor installed three shallow groundwater monitoring wells (MW-1, MW- 2, and MW-3) on September 23 and 24, 2004.�Condor prepared the Monitoring Well Installation Preliminary Report and Monitoring Well Destruction Work Plan, dated October 12, 2004, that described L' the installation of MW-3 and the discovery of grout inside the well casing. Condor recommended that IC4- IL 41 CONDOR Lr