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YT <br /> CLEARWATER <br /> G R O U P I N C <br /> Enr rrnrtmerr ta!Sernrces <br /> 4.0 RESULTS <br /> 41 Water Level Gauging Data <br /> On November 14, 1996, the depths to groundwater in the six monitoring wells <br /> ranged from 19 78 to 20 89 feet below the top of casing Groundwater elevations, <br /> calculated for the purpose of estimating flow direction and gradient, were generally <br /> 0 1 to 0 2 feet lower than groundwater elevations measured on August 20, 1996 The <br /> groundwater elevation contours shown on Figure 3 indicate that groundwater flow <br /> is toward the north and northwest The groundwater gradient is 0 014 foot/foot <br /> (14%) across most of the site, but is only 0 0056 foot/foot (0 56%) between MW-1 and <br /> MW-6 This change in gradient appears as a flattening of the water table west of the <br /> former USTs, which is consistent with the configuration of the water table during <br /> previous gauging events <br /> 4.2 Groundwater Analytical Results <br /> TPHg and BTEX were not detected in the groundwater samples from monitoring / <br /> wells MW-3, MW-4 and MW-6, the samples from MW-1 and MW-5 contained " <br /> benzene concentrations of 0 9 parts per billion (ppb) and 4 9 ppb, respectively The <br /> maximum concentrations of TPHg and BTEX, detected in the sample from MW-2, <br /> were 3 07�_ 00�gb and 180 ppb, respectively <br /> MTBE was not detected in any sample, although the detection limit for MTBE was <br /> elevated to 100 ppb in the sample from MW-2. <br /> A summary of groundwater elevations and analytical results is presented on Table <br /> 1 Hydrocarbon concentrations are presented graphically on Figure 4 Copies of the <br /> laboratory report and chain-of-custody form are attached as Appendix B <br /> D-101 4Q96 3 January 2, 1997 <br />