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�'9 KLEINFELDER <br /> 16 6. CONCLUSIONS AND RECOMMENDATIONS <br /> 6.1. CONCLUSIONS <br />' Groundwater elevations ranged from a maximum of -0 10 feet above mean sea level (msl) at <br /> MW-4 to -1 50 feet above msl at MW-2 Depth to water was measured at approximately 40 20 <br /> to 41 18 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 An approximate 115-fifth inch (0 02 feet) of floating product and a strong <br /> petroleum-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 /> 24 mg/1 and TPH-G at l 1 mg/1 Ethylbenzene was detected at 0 79 µg11 Benzene, toluene, and <br /> total xylenes were not detected above the laboratory reporting limits in the groundwater sample <br /> collected form MWA None of the requested petroleum constituents were detected in the <br /> groundwater samples collected from the down-gradient monitoring wells, MW-2 and MW-3, nor <br /> from the upgraduent 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 thus Third Quarter 2004 sampling event, product was detected in MW-1 <br /> at an approximate thickness of 0 02-feet (approximately 115 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 monitoring of the existing monitoring wells (1\4W-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 /> 2 Due to the continuing presence of floating product in MW-1, Kleinfelder recommends <br /> additional purging and removal of any product layer in MW-1 between future quarterly <br /> sampling events <br /> 28209 T03/ST04R1402/DH Iv Page 9 of I I <br />' ©2004,Klemfelder, Inc October 20,2004 <br />