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Mr John Johns= <br /> Project 113-26-03,January 11,19% <br /> Page 2 <br /> A passive skimmer was installed in MW-4 by Parker Environmental Services on <br /> • February 11, 1993, to collect floating product The skimmer allows gasoline to enter <br /> through a selective membrane that keeps water out. Ms. Lunda Turkatte, a Health <br /> Specialist from San Joaquin County, was present during the installation. No free <br /> product was collected in the skimmer during the monitoring period, and no visible <br /> sheen or free product was apparent in MW-4 during this time. <br /> Groundwater sampling was performed by Parker Environmental in February, May, <br /> August, and November, 1993. Drums with purge and wash water from the first 2 <br /> quarters were removed on August 3, 1993 The liquid was taken to Gibson Pilot <br /> Plant in Redwood City by Erickson, Inc. of Richmond, using a hazardous waste <br /> manifest. <br /> z <br /> Groundwater flow direction was to the northeast m November, 1993, compared to <br /> the north in August, 1993, and to the southeast in May, 1993. MW-2 and MW-3 were <br /> ND (non-detect) in August, 1993. MW-1 had 160 ppb TPH-g (ND for benzene), while <br /> MW-4 had 41,000 ppb TPH-g and 2,200 ppb benzene. <br /> Groundwater monitoring was performed on September 9, 1994. The passive <br /> skimmer again contained no product and was removed from MW4. Average depth <br /> to groundwater was 6.78 feet, with flow to the north-northwest. MW-4 had 2,500 ppb <br /> TPH-g and 350 ppb benzene; MW-1 had 610 ppb TPH-g and 0.80 ppb benzene; MW-2 <br /> was ND for TPH-g with 0.80 ppb benzene, MW-3 was ND for TPH-g and benzene. <br /> • II- Current Activities <br /> Groundwater samples were obtained on December 22, 1994. Prior to sampling, <br /> groundwater elevation measurements were obtained using an electric water-level <br /> meter. Results are presented in the table below. <br /> Table 1 - Well Data <br /> Cheaperl Store #37 <br /> 15 East Grant Line Road, Tracy, California <br /> December 22, 1994 <br /> Well # Well Top Elevation Depth to GW GW Elevation* <br /> MW-1 100.20 6.13 94.07 <br /> MW-2 10020 6.14 94.06 <br /> MW-3 10140 - 7.26 94.14 <br /> MW-4 99.20 5.15 94.05 <br /> * An arbitrary elevation of 100.0'was established on the site for the GW elevation. All elevations <br /> given in feet. <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94365-2317 <br /> Pbone (510) 439-1024 Fax (510) 439.2566 <br />