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f <br /> Mr John Johmm <br /> Project 113-26-03,April 20, 1995 <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 /> Groundwater flow direction was N37°E in November, 1993, compared with N70E in <br /> August, 1993, and N16°E in May, 1993. <br /> Groundwater monitoring was performed on September 9, 1994. The passive <br /> skimmer again contained no product and was removed from MW-4. Average depth <br /> to groundwater was 6 78 feet, with flow to the north-northwest. Groundwater <br /> monitoring was performed on December 22, 1994. Groundwater sample results are <br /> presented below <br /> Table 1 - Previous Groundwater Sampling Results <br /> Cheaper! store #37, 15 East Grant Line Road, Tracy, California <br /> Date Wel! . . TPH-g Benzene Toluene Ethylbenzene Xylenes <br /> 9/22/92 1 520 2.1 3.3 0 7 21 <br /> 2/93 1 170 1.9 7.2 4 1 3.2 <br /> 5/93 1 280 1.7 1 1 0 75 0 75 <br /> 8/93 1 240 ND<05 ND<0.5 ND<05 ND<0.5 <br /> 11/93 1 160 ND<0 5 ND<0.5 6 4 0 57 <br /> 9/8/94 1 610 0.77 ND<05 1 3 0 83 <br /> 12/22/94 1 140 ND<0 5 ND<0 5 ND<0 5 0 83 <br /> 9/22/92 2 n a n a n a n a n a <br /> 2/93 2 ND<50 ND<QS 3.9 ND<Q5 1.6 <br /> 5/93 2 ND<50 ND<0.5 ND<Q5 ND<0.5 ND<a5 <br /> 8/93 2 DD ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 11/93 2 ND<SO ND<0.S ND<0.5 ND<a5 ND<05 <br /> 9/8/94 2 14D<50 080 ND<Q5 ND<0 5 ND<Q5 <br /> 12/22/94 2 ND<50 ND<0 5 ND<0 5 SID..<0 5 ND<0 5 <br /> 9122/92 3 ND<50 0.7 1.4 ND<Q5 9.2 <br /> 2/93 3 ND<50 ND<0.5 3 9 ND<Q5 1.7 <br /> 5/93 3 ND<50 ND<Q5 ND<0.5 ND<05 ND<Q5 <br /> 8/93 3 ND<50 ND<0 5 ND<05 ND<0.5 ND<0 5 <br /> 11/93 3 ND<50 ND<0.5 ND<0 5 ND<05 ND<0 5 <br /> 9/8/94 3 ND<50 ND<05 ND<0 5 ND<05 ND<0 5 <br /> 12/22/94 3 ND<50 _ ND<Q5 ND<0 5ND<0 5 ND<0 5 <br /> 1 <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />