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' Ms Lori Duncan Page 2 of 3 Groundwater Sampling Due to the presence of free product in well MW3, groundwater samples were only collected from wells MW 1, MW2 and MW4 A minimum of three well casing volumes of water was purged from each well prior to sampling The physical parameters of temperature, pH and electrical conductivity were measured during the purging process Groundwater samples were collected after the physical parameters had stabilized and water levels recovered to their pre-purged levels The samples were placed into an ice chest cooled to approximately 4°C and transported to Argon Laboratories (ELAP 42359)under chain of custody protocol Well purge logs are included in Attachment A Free Pi oduct Measurement and Recovery A Ground Zero technician measured and removed free product from well MW3 on July 13, September 21, and September 26, 2001 The thickness of measured product averaged 0 94 feet over that period Most recently, product thickness measured 0 99 feet on September 26, 2001 Approximately 3 5 gallons of product/water mixture was removed from well MW3 by manually balling the product from the well and storing the product in a double-contained salvage drum As an interim remedial action, Ground Zero is actively bailing product from well MW3 on a weekly basis Table 2 summarizes product thickness measurements and volume removed Field notes associated with product balling are included in Attachment B GROUNDWATER ANALYTICAL RESULTS Groundwater samples were analyzed for TPHg and TPHd using EPA method 8015M, BTEX using EPA method 8020, VOCs, oxygenated gasoline additives, 1,2-dichloroethane (1,2 DCA), and ethylene dibromide (EDB) using EPA method 8260B, TRPH using EPA Method 1664, and dissolved (filtered) lead using EPA Method 6010/200 7 No TPHg, TPHd, TRPH, BTEX, gasoline oxygenates, 1,2 DCA, EDB, or lead was detected in groundwater samples collected from wells MW 1, MW2, or MW4 Low levels of tetrachloroethene (PCE) and chloroform were detected in wells MW 1, MW2 and MW4 Wells MW 1 and MW4 contained cis-l,2-dichloroethene at levels below the Primary Maximum Contaminant Level (MCL) of 6 0 parts per billion(ppb) Trichloroethene(TCE) was detected in well MW 1 at a concentration below its primary MCL of 5 0 ppb PCE concentrations in wells MWl, MW2, and MW4 ranged from 17 ppb to 19 ppb, which exceeds the primary MCL of 5 0 ppb for PCE Groundwater analytical results are summarized in Tables 3 and 4 Attachment C contains laboratory reports and chain of custody documentation SUMMARY Groundwater levels and the direction of groundwater flow beneath the site were generally consistent with historical measurements No petroleum hydrocarbon constituents were detected in wells MWI, G 1DaU\GROUNDZEIGABBARDIrcporfs13QM2001 doe