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MW-3, which was assigned an elevation of 100 feet The relative groundwater elevation <br /> ranges from 23 92 feet in MW-5 to 25 81 feet in MW-4 Groundwater has dropped an <br /> average of 129 feet since the May 1994 monitoring However, a greater drop in groundwater <br /> was observed in MW-5 (1 41 feet) This well continues to show a significantly lower <br /> groundwater elevation Monitoring well MW-6 also shows a lower groundwater elevation <br /> The reason for this anomaly is not clear <br /> Figure 3 is a groundwater contour map drawn ignoring the data from MW-5 The gradient <br /> averages approximately 0 0032 ft/ft directed S 13'W This gradient is similar to the February <br /> 1994 gradient <br /> TABLE 2 <br /> RELATIVE GROUNDWATER ELEVATIONS <br /> Lockeford Beacon <br /> Depth to Gioundwater Relative Gioundwater <br /> Relative Elevation <br /> Well No Casing 2/16/94 5/4/94 11/21/94 2/16/94 5/4/94 11/21/94 <br /> Elevation <br /> MW-1 9962 7252 7268 7393 2710 2694 2569 <br /> MW-2 9926 7245 7263 7387 2681 2663 2539 <br /> MW-3 10000 7292 7308 7435 2708 2692 2565 <br /> MW-4 9884 7161 7175 7303 2723 2709 2581 <br /> MW-5 <br /> 9871 7208 7338 7479 25 63 2533 2392 <br /> MW-6 9876 7213 72 31 7361 2663 2645 25 15 <br /> 'All measurements ui feet <br /> 4.4 Laboratory Evidence of Hydrocarbon-Iinpacted Groundwater <br /> TPH as gasoline was detected in the water sample from MW-5 at 200 ppb, benzene, <br /> toluene, ethylbenzene and xylenes were detected at 4 4 ppb, 13 ppb, 2 7 ppb and 55 ppb <br /> respectively Traces of toluene and xylenes were detected in MW-2 at 0 61 ppb and 2 6 ppb <br /> respectively Traces of toluene was also detected in MW-4 at 0 41 ppb No other petroleum <br /> I hydrocarbons were detected in any samples The analytical results aie summarized on Table <br /> 3 The laboratory report and chain-of-custody aie included in Appendix B <br /> 0-1- q1 A.&Servws. lu <br /> IInclzr-,d Baron QP-VLI 9WWS <br />