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50 CONCLUSIONS <br /> Second Quarter 2004 groundwater elevations decreased an average 1 35 feet since First Quarter <br /> 2004 Contaminant concentrations in groundwater in the Second Quarter 2004 were similar to those <br />' fiorn the previous quarter throughout the Site with the exception of contaminant trends in MW-1 and <br /> the presence of free product in MW-3 Perimeter wells (MW-6, MW-8, and MW-9) and well AS-] <br /> i (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 Second Quarter 2004, except <br /> TPHg was reported in MW-6 at 57 ug/l It appears the dissolved petroleum hydrocarbons in the <br /> 1 souice area are present within the upper 10 feet of the saturated zone and are laterally defined by <br /> pei i peter wells MW-6, MW-8, and MW-9 <br /> 1 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 Tine SVE <br />' system continues to remove contaminant mass from the vadose zone at an average rate for the <br /> reporting period of 1 0 pounds per day <br /> Free product was first observed in Fourth Quarter 2003 in wells MW-1 and MW-3 at approximately <br /> '/a-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 A sheen of free product was observed on the water surface in MW- <br /> 3 in the Second Quarter 2004 <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> I <br /> I <br /> t <br /> 1 <br /> Pioi4c,t No 59643-06-01 -10- July 1 2004 <br />