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i <br /> Table 3-1 <br />' Groundwater Parameter, Depth, and Elevation Data <br />' Top of <br /> Conduc- Casing Depth to 15 November 1999 <br /> Temp tivity Elevation (ft Water Water Elevation (ft <br /> Well pH MHOS) MSL ftMSL <br />' MW-2 242 703 1,400 NM 26 18 NM <br />' MW-2A 23 8 739 1,250 1191 26 17 -1426 <br /> MW-3A 20 8 7 11 1,220 1123 25 68 -1445 <br /> MW-4 215 8 15 802 13 46 2702 -13 56 <br />' MW-5 NM NM NM 12 83 24 87 -1204 <br /> MW-6 219 7 57 910 13 17 26 03 -12 86 <br />' MW-7 21 8 759 856 13 14 27 76 -1462 <br /> MW-8 NM NM NM 13 76 28 16 -144 <br /> IL' MW-9 j 22 1 740 958 1226 2654 -1428 <br /> Note NM = Not Measured <br /> A potentiometnc contour map developed from the water level data is presented on Figure 3-1 <br />' As in previous sampling rounds groundwater flow is generally toward the north-northeast within <br /> a trough The horizontal groundwater gradient down the center of the trough was 0 0018 ft/ft <br /> 1 <br />' 3.2 ANALYTICAL RESULTS <br /> i <br /> A summary of the analytical data for the May 2000 groundwater sampling is presented in Table <br /> 3-2 Historical groundwater analytical results are presented in Table A-1 in Appendix A The <br /> analytical reports and Chain of Custody forms are presented in Appendix C <br /> 1 <br /> Petroleum hydrocarbons were detected in samples collected from MW-2, MW-2A, MW-3A, MW- <br />' 6 and MW-7 Petroleum hydrocarbons had not been detected to MW-6 or MW-7 since the fourth <br /> quarter 1999 The highest concentrations of hydrocarbons were detected in samples from MW-2 (azc 7 <br /> and MW-2A No petroleum hydrocarbons were detected in samples collected at MW-4�M.W_f , <br /> .? MW-6, MW-7, or MW-9 Samples from MW-2A, MW-3A and MW-9 were analyzed for MTBE <br />' by U.S EPA Method 8260 None of these samples contained detectable concentrations of MTBE <br />' NCAShamd\PROJECCSISANIOQ%IISAI3000RPT WPO 4 <br />