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KLEINFELDER <br /> 6 CONCLUSIONS AND RECOMMENDATIONS <br /> 6.1. CONCLUSIONS <br />' Groundwater elevations ranged from a maximum of 1 30 feet above mean sea level (msl) at <br /> MW-4 to 0 17 feet above msl at MW-2 Depth to water was measured at approximately 38 50 to <br /> 39 54 feet bgs Groundwater flow was towards the southwest with an approximate gradient of <br />' 0 004 ft/ft <br /> No product or sheen was observed from groundwater from perimeter monitoring wells MW-2, <br /> MW-3, and MW-4 Approximately 1/4-inch of floating product and a strong petroleum-like odor <br /> was noted in the groundwater from monitoring well MW-1 <br /> TPH-D and TPH-G were detected in the groundwater sample collected from MW-1, located <br /> approximately 10 feet down-gradient of the UST area TPH-D was detected at concentrations of <br /> 26 mg/1 and TPH-G at 0 87 mg/l Ethylbenzene and total xylenes were detected at 1 3 µg/1 and <br /> 0 57 4g/l, respectively Benzene and toluene were not detected above the laboratory reporting <br /> limits in the groundwater sample collected form MW-1 None of the requested petroleum <br /> constituents were detected in the groundwater samples collected from the down-gradient <br /> monitoring wells, MW-2 and MW-3, nor from the upgradient well MW-4 <br />' Based on the information obtained, it is Kleinfelder's opinion that the groundwater contaminant <br /> plume is located in the vicinity of MW-1 and the existing UST area, and is apparently contained <br /> within perimeter monitoring wells MW-2, MW-3 and MW-4 A petroleum product layer has <br /> been detected on the surface of groundwater in monitoring well MW-1 over the last eight <br /> quarterly sampling events at thicknesses ranging from a film (<0 01 feet) to approximately 33 <br />' feet (4 inches) During this Fourth Quarter 2004 sampling event, product was detected in MW-1 <br /> at an approximate thickness of approximately 1/4-inch Floating product was not detected in the <br /> initial five groundwater sampling events beginning in June 2000 through June 2002 <br /> 6 2. RECOMMENDATIONS <br /> Based on the data obtained during this assessment, Kleinfelder makes the following <br /> recommendations <br /> 1 Continue quarterly monitoring of the existing monitoring wells (MW-1, MW-2, MW-3, and <br />' MW-4) However Kleinfelder does not recommend continued collection of groundwater <br /> samples for analyses for MW-1 if a product layer is detected <br /> 28209 T03/ST05R277/DH Iv Page 9 of I I <br /> (D 2005, Kleinfelder, Inc March 10,2005 <br />