Laserfiche WebLink
1 <br /> 1 50 CONCLUSIONS <br /> Fourth Quarter groundwater elevation decreased an average 1 21 feet since Third Quarter 2003 <br /> Contaminant concentrations in groundwater in the Fourth Quarter demonstrated a continuing trend of <br /> decreasing concentrations throughout the Site Perimeter wells (MW-6, MW-8, and MW-9) and well <br /> 1 AS-1 (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 Fourth Quarter 2003 It appears <br /> the dissolved petroleum hydrocarbons in the source area are present within the upper 10 feet of the <br /> 1 saturated zone and are laterally defined by perimeter wells MW-6, MW-8, and MW-9 <br /> 1 Based on the decreasing contaminant concentration trend in groundwater, it is apparent that the <br /> remedial systems are effective at reducing contaminant mass in groundwater The SVE system <br /> continues to remove contaminant mass from the vadose zone at an average rate for the reporting <br /> 1 period of 60 pounds per day <br /> i <br /> 1 <br /> M <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> • <br /> 1 <br /> Project No 58643-06-01 -9- November 3 2003 <br />