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50 CONCLUSIONS <br /> ' First Quarter 2004 groundwater elevations increased an average 0 95 feet since Fourth Quarter 2003 <br /> Contaminant concentrations in groundwater in the First Quarter 2004 were similar to those from the <br /> previous quarter throughout the Site with the exception of contaminant trends in MW-1 and the <br /> ' presence of free product in MW-3 Perimeter wells (MW-6, MW-8, and MW-9) and well AS-1 <br /> (screened approximately 10 feet below the water table from 40 to 45 feet bgs) did not contain <br /> benzene, TPHg, or FOCs above laboratory reporting limits for the First Quarter 2004 It appears the <br /> dissolved petroleum hydrocarbons in the source area are present within the upper 10 feet of the <br /> saturated zone and are laterally defined by perimeter wells MW-6, MW-8, and MW-9 <br />' Contaminant concentrations in groundwater at the Site have decreased significantly It is apparent <br />' that the remedial systems are effective at reducing contaminant mass in groundwater The SVE <br /> system continues to remove contaminant mass from the vadose zone at an average rate for the <br /> reporting period of 1 5 pounds per day <br /> Freeroduct was first observed m Fourth Quarter 2003 in wells MW-1 and MW-3 at approximately <br /> p Q PP Y <br />' i/4-inch thick In the First Quarter 2004, no free product was observed in MW-1, and approximately <br /> 6-inches was observed in MW-3 <br /> The RWQCB requested four consecutive quarters of dissolved metal concentrations in groundwater <br /> from wells MW-5, MW-5D, MW-6 and MW-9 A total of five consecutive quarters of groundwater <br />' metal data have been assembled Geocon will discontinue collecting groundwater samples for <br /> dissolved metal analysis <br /> 1 <br /> 1 <br /> 1 <br /> Proic.c l No 58643-06-01 -9- February 18 2004 <br /> 1 <br />