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t <br /> Beacon Station No 641 April 22, 1999 <br /> Stockton California Work Plan <br /> constructing four groundwater monitoring wells, MW-6 through MW-10 A report will be <br /> prepared which will present field procedures, sampling and test results, and conclusions <br /> regarding the work performed at the site <br /> The scope of work described in this work plan is intended to comply with Tri-Regional <br /> Guidelines and SJC PHS/EHD guidelines Horizon's Field Methods and Procedures are <br /> included in Appendix A of this Work Plan <br /> SITE DESCRIPTION AND BACKGROUND <br /> Beacon Station No 641 is an operating service station located on the southwest corner of the <br /> intersection of East Hammer Lane and Kathleen Drive in Stockton, California (Figure 1) <br /> The site is located within a primarily commercial area of Stockton Site facilities include a <br /> service station/convenience store, two canopy-covered product dispenser islands situated in <br /> the central portion of the property, and three double-walled underground storage tanks <br /> (USTs) located in the western portion of the property The locations of these facilities and <br /> other pertinent site features are depicted on the Site Plan (Figure 2) <br /> On June 11, 1996, Horizon personnel were onsite to perform soil sampling subsequent to <br /> removal and prior to replacement of the USTs Four, single-walled, steel USTs (T-1 through <br /> T-4) and associated product lines were removed at that time Each UST had a 10,000-gallon <br /> capacity and was used for the storage of regular, plus, and premium grades of unleaded <br /> gasoline All four USTs had been contained in a common cavity as shown on Figure 2 <br /> Overexcavation was conducted to 19 feet bsg beneath former USTs T-1 and the west half of <br /> T-2 Due to the proximity of the sidewalk and street, additional overexcavation could not be <br /> conducted Results of laboratory analyses indicated elevated concentrations of gasoline <br /> hydrocarbons (TPHg) to 6,800 parts per million (ppm) and benzene to 80 ppm detected in <br /> the soil beneath former USTs T-1 and T-2 between depths of 14 to 19 feet <br /> 1641-14 wp 2 HORIZON ENVIRONMENTAL INC <br />