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REPORT ' SOIL VAPOR EXTRACTION (SVE) SYSTEM EVALUATION ' Canepa's Car Wash 6230 Pacific Avenue Stockton, CA 95207 ' September 23, 1996 Prepared by- Condor Earth Technologies, Inc 1 0 INTRODUCTION The following data was compiled during a site investigation conducted by Condor Earth Technologies, Inc (Condor) on July 31, 1996, at the Canepa's Car Wash facility (Figure 1, Appendix A) The fieldwork included a review of existing Investigative reports provided by Canepa's Car Wash and an evaluation of the existing SVE system located at the site The fieldwork was conducted in accordance with Condor's proposal for SVE evaluation, dated April 8, 1996, and the addendum to the proposal, dated May 2, 1996 All work was performed as directed by the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) The site background and SVE evaluation data are presented below in the order requested by the PHS/EHD 2 0 SITE BACKGROUND Canepa s Car Wash consists of ail automated car washing facility, a fuel station and a convenience store ' (Figure 2, Appendix A) The site is located at 6230 Pacific Avenue, in north Stockton, California The car wash and fuel station have been in operation for approximately 20 years Between February 25 and March 3, 1993, three (3) underground fuel tanks, fuel lines and dispensers were removed by WHF Environmental (WHF) and replaced with a doubled walled system The tanks consisted of two (2) 12 000-gallon gasoline tanks and one(1) 5,000-gallon diesel tank As reported by WHF upon removal of the tanks and piping, it was discovered that the fuel lines had leaked and that the tanks had been overfilled Approximately 600 cubic yards of soil were removed from the fuel tank excavation area The excavated soil was subsequently characterized and disposed of at Forward Landfill in Manteca, California At least 16 soil samples were collected from the tank excavation for laboratory analyses The laboratory ie-ults indirgterl nrPrinminnntly Inixr TI)TI_� (. --T.-- + -1 C A,—� a nmi-X r"-�" J ki as aline ai -i✓ ingrng) and 1V vA U NE/1. concentrations One(]) soil sample collected from the northeast sidewall of the tank excavation contained 773 mg/kg TPH-G and BTEX concentrations up to 170,000 µg/kg(xylene) TPH-D (diesel)was detected in one soil sample at 32 mg/kg At least seven (7) soil samples were collected from beneath the former fuel dispenser islands for laboratory analyses Elevated concentrations of TPH-G (up to 3 800 mg/kg) and BTEX concentrations ranging from 26 µg/kg to 560,000 µg/kg were detected in the fuel dispenser soil samples TPH-D (diesel) was not detected beneath the former fuel dispenser islands On March 12, 1993, soil boring (B-1) was installed, by WHF, immediately east of the former fuel dispenser islands (Figure 2, Appendix A) Groundwater was encountered at approximately 56 feet below �. CONDOR