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MONITORING WELL INSTALLATION WORK PLAN Raymond Investment Corporation 730 E. Channel Street Stockton, California L. 1.0 INTRODUCTION This work plan was prepared by Condor Earth Technologies, Inc. (Condor) to describe the proposed L+ installation of three groundwater monitoring wells at 730 E. Channel Street (site) in Stockton, California (Figures 1 and 2, Appendix A). In a letter dated July 7, 2004, Vicki McCartney of the San Joaquin County Environmental Health Department (SJCEHD) directed the preparation and submittal of a work 9.0 plan for the installation of three groundwater monitoring wells at the site. Condor prepared this work plan at the request of Beverly Garcia of Raymond Investment Corporation (property owner) in response to that directive. 6d All work conducted by Condor will be under the supervision of a California registered geologist. This ' work plan includes project background information; a description of the field, laboratory, and reporting L. procedures proposed to conduct the work; and a project schedule. 2.0 PROJECT BACKGROUND +� On April 29, 2003, Oil Equipment Services removed one underground storage tank(UST) and associated piping at the site. The UST was discovered as part of a Phase If Environmental Site Assessment performed in May, June, and September 2002, and completed for the City of Stockton Department of Housing and Redevelopment. The SJCEHD required removal 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 ar activities and the collection of soil samples. The UST was an approximately 1,000-gallon capacity single-wall steel tank twelve feet long and four Lo feet in diameter. The excavation associated with the UST was approximately six feet by fifteen feet by six 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. s� 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 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 the 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 CA CONDOR