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' Mr.John Johnson <br /> Project 113.26-02,December 16,1993 <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 1'he skimmer allows gasoline to enter <br /> through a selective membrane that keeps water out. Ms. Linda 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 /> Groundwaterr <br /> sampling was performed by Parker Environmental in February, 1993, <br />' May, 1993, and August, 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. Drums were retained by Parker Environmental as future groundwater <br /> purge and wash water containers for this facility, <br /> II. Current Activities <br /> Groundwater samples were obtained on November 30, 1993. The Skimmer was <br /> removed from MW-4 and inspected No product was present in the collection <br /> chamber of the slimmer Prior to sampling, groundwater elevation measurements <br /> were obtained using an electric water-level meter. Results are presented in the table + <br /> i below <br /> Table 1 - Well Data <br /> Cheaper! Store #37 <br /> 15 East Grant Line Road, Tracy, California <br /> November 30, 1993 <br /> Well # Well Top Elevation Depth to GW GW Elevation" <br /> ■ �r.�rr�.rnoi --nunr.r�i <br /> MW-1 100.20 6.09 _ 94.11 <br /> MW-2 1X).20 6.11 94,09 <br />' <br /> MW-3 101.40 7.23 9417 <br /> MW-4 99.20 5.12 9408 <br /> * An arbitrary elevation of 100.0' was established on t e site for the GW elevation. <br />' All elevations given in feet. <br /> Groundwater is about eight inches higher than m August, 1993, and about four <br />' inches higher than in May, 1993, The direction has changed to the northeast, <br /> compared to the north in August, and to the southeast in May. No free product was <br />' detected in MW4 A comparison of groundwater elevations for all four quarterly <br /> events is presented below. <br /> 47 <br />' Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (510) 439-1024 Fax (514) 439-2566 <br />