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T <br /> 7• <br /> Laurie Cotulla <br /> May 15, 1.986 <br /> Page 2 <br /> On May 6, 1986 Groundwater Technology initiated drilling of <br /> soil borings to be completed as groundwater monitoring wells. A <br /> total of four wells, GT-1 through GT-4, were installed at the <br /> locations shown on the site map (See Figure 1) . The wellhead <br /> elevations were surveyed to a bench mark at the west end of the <br /> pump island assigned an elevation datum of 100.00 feet. <br /> The wells have been monitored periodically since their <br /> installation in accordance with Groundwater Technology Standard <br /> Operating Procedure SOP 8 (See Attachment 1) . Ground water <br /> occurs at a depth of about 30 feet and appears to flow in an <br /> easterly direction under a very slight gradient. Monitoring well <br /> GT-1 exhibited free product the day of drilling, May 6, 1986. <br /> Free product was first detected in well GT-4 on May 12 and in <br /> well GT-2 on May 15. A summary of the groundwater monitoring <br /> data is presented in Table 1. <br /> samples of groundwater within wells GT-2 and GT-3 were <br /> collected May 12, 1986 to be analyzed for concentrations of <br /> dissolved hydrocarbon constituents by EPA Method 602. The <br /> sampling and preservation were conducted in accordance with <br /> Groundwater Technology Standard Operating Procedures SOP 9, 10 <br /> and 11 (See Attachments 2, 3 and 4). <br /> Verbal results received from the laboratory indicate total <br /> volatile hydrocarbon concentrations of 160 and 29 parts per <br /> million (ppm) in wells GT-2 and GT-3 respectively (See Table 2). <br /> Preliminary research indicates that a majority of the <br /> residences in the near vicinity of the site use groundwater pumped <br /> from privately owned domestic wells. As such the most immediate <br />