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k9 KLEINFELDER <br /> 6 CONCLUSIONS AND RECOMMENDATIONS <br /> 61. CONCLUSIONS <br /> Groundwater elevations ranged from a maximum of 1 37 feet above mean sea level (msl) at <br /> MW-4 to a minimum of 0 35 feet above msl at MW-2 Depth to water was measured at <br /> approximately 38 41 to 39 42 feet bgs Groundwater flow was towards the southwest with an <br /> approximate gradient of 0 003 ft/ft <br /> No product or sheen was observed from groundwater from perimeter monitoring wells MW-2, <br /> MW-3, and MW-4 An approximate one-eighth inch of floating product and a strong petroleum- <br /> like odor 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 /> 14 mg/l and TPH-G at 1 5 mg/l Ethylbenzene and total xylenes were detected at 1 4 µg/1 and <br /> 0 57 µg11 Benzene and Toluene were not detected above the laboratory reporting limits in the <br /> groundwater sample collected form MW-1 None of the requested petroleum constituents were <br /> detected in the groundwater samples collected from the down-gradient monitoring wells, MW-2 <br /> and MW-3, or in the upgradient well MW-4 <br /> Based on the information obtained, it is Klemfelder'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 nine <br /> quarterly sampling events at thicknesses ranging from a film (<0 01 feet) to approximately 33 <br /> feet (4 inches) During this First Quarter 2005 sampling event, product was detected in MW-1 at <br /> an approximate thickness of 0 01 feet (approximately 118 inch) Floating product was not <br /> detected in the initial five groundwater sampling events beginning in June 2000 through June <br /> 2002 <br /> 6.2 RECOMMENDATIONS <br /> Based on the data obtained during this assessment, Kleinfelder makes the following <br /> recommendations <br /> 1 Continue quarterly groundwater monitoring of the existing wells MW-1, MW-2, MW-3, <br /> and MW-4 i <br /> 28209 T0615T05R717/I.TV lv Page 9 of 1 I <br /> ©2005,Kleinfelder, Inc June 23,2005 <br />