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f <br /> Mr Kyle Christie <br /> April 4, 1995 <br />., Page 2 <br /> Results and Discussion <br /> Summaries of depth-to-water measurements and calculated groundwater elevations are <br /> presented in Table 1 Table 2 lists past and present groundwater flow directions and hydraulic <br /> gradients for this site <br /> Analytical results of groundwater samples are summarized in Table 3 The complete <br /> laboratory report for the sampling event is presented in Exhibit A. Figure 2 shows TPH-G <br /> and BTEX concentrations for this sampling event <br /> The general groundwater flow direction beneath the site on December 16, 1994, was to the <br /> northeast under a hydraulic gradient of approximately 0 002 (Figure 1) <br /> Since groundwater monitoring began in April, 1987, the general groundwater flow direction <br /> has ranged from north to east at this site The hydraulic gradient measured this quarter is <br /> within the range of previously reported gradients Depth-to-water on December 16, 1994 <br /> ranged from 8 29 feet in Well ATR-8 to 12 74 feet in Well ATR-1 Since the last quarterly <br /> monitoring event (October 7, 1994), water-level elevations in the monitoring wells have <br /> increased an average of 0 35 feet. <br /> Benzene concentrations this quarter ranged from nondetectable in wells ATR-1, ATR-2, <br /> ATR-6, ATR-7, ATR-9, ATR-10, and ATR-11 to 740 micrograms per liter (pg/1) in well <br /> SMW-1 These concentrations are within the range of previously reported values. TPH-G <br /> concentrations ranged from nondetectable in wells ATR-1, ATR-2, ATR-6, ATR-7, ATR-9, <br /> ATR-10, and ATR-11 to 5200 pg/1 in well SMW-1 These concentrations are consistent with <br /> previous values The detection limit for benzene is 0.5 pg/i and for TPH-G is 50 pg/1. Wells <br /> ATR-8 and ATR-3 were not sampled due to the presence of a free product sheen. <br /> SUMMARY OF WORK <br /> Work Completed in Fourth Quarter 1994 <br /> Sampled site groundwater monitoring wells for the fourth quarter 1994 Sampling <br /> performed by GTI <br /> • Prepared and submitted third quarter 1994 groundwater monitoring report. <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> 1264NREPORTS4TH94QTR= <br />