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Remedial Well and Soil Vapor Extraction System Installation Report 6 Ranh Market 23569 South Santa Fe Road Riverbank CA November 27 2002 C sent to Kiff Analytical and analyzed for TPHg, BTEX, and MtBE by EPA Method 8260B, and total lead by EPA Method 6010 TPHg, BTEX, and MtBE were not detected in sample SP-1 (ABC) above laboratory reporting linvts TPHg was detected at 5 1 mg/kg in SP-2 (AB), and benzene and MtBE were not detected above laboratory reporting limits Total lead was reported in SP-1 (ABC) and SP-2 (AB) at concentrations of 3 08 mg/kg and 5 96 mg/kg, respectively Copies of the laboratory analytical report are provided in Appendix E Drilling activities also generated six drums containing equipment rinsate water The water was removed from the site by Integrated Wastestream Management and taken to Seaport Environmental in Redwood City, CA for disposal The non-hazardous waste manifest is provided in Appendix F 5.0 RESULTS OF SAMPLING ANALYSIS 51 Results of Soil Sampling The highest concentrations of hydrocarbons in soil were found west of the former UST pit (S- 7) The highest levels of TPHg, benzene, and MtBE were reported in the 25-foot sample from S-7 at concentrations of 6,600 mg/kg, 49 mg/kg, and 0 52 mg/kg, respectively (Figure 3 and Table 1) The 20-foot soil sample from well S-12 contained low levels of TPHg (11 mg/kg), benzene (0 30 mg/kg), and MtBE (0 023 mg/kg) The remaining soil samples in S-12, and the soil samples from S-13 and S-17, did not contain TPHg, benzene, and MtBE above laboratory detection limits, except for 0 0076 mg/kg xylenes in S-17 (35 feet bgs) Copies of the analytical data are included in Appendix E 6.0 REMEDIATION SYSTEM INSTALLATION ACTIVITIES 6.11 Remedial System Piping Construction activities for the installation of the remediation system at the Ranch Market site began on July 29, 2002 SECOR oversaw the El Dorado Remediation Group (ERG) of El Dorado Hills, California complete the various stages of the remediation system installation The remediation system location was not completed until the trench for the remedial piping was completed In addition to existing SVE wells well V-1 through V-6, new SVE wells V-7 through V-10 were piped to the compound location (Figure 3) Ozone sparge wells S-1 through S-20 were also piped to the compound location Individual 2-inch diameter Schedule 40 polyvinyl chloride extraction lines were run from ten soil vapor extraction wells V-1 through V-10, to the remediation compound Individual Ch- inch diameter butt-welded Purad PVDF lines were run from twenty ozone sparge wells S-1 through S-20, to the remediation compound The SVE lines and ozone sparge lines were buried a minimum of 2 feet bgs in the trenches leading from each respective SVE or ozone sparge well to the remediation compound Electrical warning tape was installed above the I\Ranch Market-Rtverbank\Reports\RB-Reined Well Install doc SECOR International Incorporated