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• ERI ENVIRONMENTAL RESOLUTIONS, INC. October 18, 1999 ERI 205504 R01 Mr Ed Ralston Tosco Marketing Company 1380 Lead Hill Road, Suite 120 Roseville, California 95661 Subject Air Sparge/Soil Vapor Extraction Test at Tosca 76 Service Station 5886, 2701 March Lane, Stockton, California Mr Ralston At the request of Tosco Marketing Company (Tosco), Environmental Resolutions, Inc (ERI) performed a three-day air sparge/soil vapor extraction (AS/SVE) test at the subject site ERI used a mobile AS/SVE trailer to extract soil vapors from the vadose zone and remove residual hydrocarbons and methyl tertiary butyl ether (MTBE) from the soil The AS/SVE trailer is equipped with a 1 5-horsepower Rotron blower, an oil-less air compressor, a moisture separator, four 200-pound vapor- phase carbon adsorbers connected in series for vapor abatement, and associated instruments for measuring flow, temperature, vacuum, and hydrocarbon concentrations ERI performed the work from May 10 through May 12, 1999 Existing on-site groundwater monitoring wells (MW2, MW3, and MW6) were used as part of the AS/SVE test The locations of the wells are shown on the Generalized Site Plan (Plate 1) On May 10, 1999 ERI mobilized to the site Prior to begumnig AS/SVE testing, background groundwater and soil vapor samples were collected from wells MW2 and MW3 AS/SVE testing was started using MW3 as the extraction well ERI rotated extraction wells based on photoionization detector (PID) readings Every half-hour ERI personnel recorded applied vacuum, applied sparge pressure, system flow, and influent concentrations at the extraction well, and recorded magnehelic readings at the observation wells The effluent vapor stream of the carbon abatement system was monitored every hour using a PID Field data recorded during SVE testing is presented iii Table 1 At the beginning and ending of each testing day, influent soil vapor samples were collected and submitted to Sequoia Analytical Laboratories, Inc for analysis of total purgeable petroleum hydrocarbons as gasoline (TPPHg)using EPA method 8015, benzene, toluene, ethylbenzene and total xylenes (BTEX) using EPA method 8020, and MTBE using EPA method 8020 MTBE confirmatory analysis was performed on select soil vapor samples using EPA method 8260 Sample results are presented in Table 2 Laboratory analytical results and Chain of Custody records are included as Attachment B On May 10, 1999, ERT applied vacuum to MW3 for approximately one hour At which point, the SVE moisture separator was full of water The SVE was stopped for approximately 30 minutes while the moisture separator was emptied The air sparge pressure was decreased to lessen water collection 73 Digital Drive, Suite 100, Novato, Caldomia 94949-5791 415-382-9105 (FAX 415-382-1856) Lake Forest - Novato • Seattle