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C-SHADRIFS.6/SE WER.7 <br /> 06/08/90 <br /> 4.0 ADDITIONAL WORK <br /> Using the results of historical data and the rankings produced in this study, a <br /> soil gas survey is proposed for the areas immediately surrounding each of 10 <br /> breaks discussed in the following paragraphs. The soil gas survey will target <br /> solvents because they are easily detected using soil gas techniques, and because <br /> the existing data suggest that these contaminants represent the primary cause <br /> for concern. A minimum of 15 soil gas measurements will be made in each <br /> area. If the soil gas surveys indicate positive results at any of the 10 <br /> investigated sites, then the next 10 worst cases will be examined in the same <br /> manner. Soil borings will be completed in areas identified by the soil gas <br /> survey as suspected leaks. Soil samples from these borings will be analyzed for <br /> the contaminants determined to have been present in that particular sewer <br /> segment. Groundwater monitor wells will be installed to investigate <br /> contaminant distribution in areas adjacent to sewer breaks where contamination <br /> was confirmed in the soil. <br /> The 10 areas proposed for additional investigations and the rationale are as <br /> follows: <br /> Area 1 At the Category 1 break north of manhole <br /> 2-50. This line carried waste from the vehicle <br /> maintenance complex, including Bldg. 179 and <br /> surrounding buildings. <br /> Area 2 At the large Category 2 break south of <br /> manhole 2-31. This site is within a French <br /> drain and will allow investigation of <br /> infiltration of industrial wastewater through <br /> broken French drains. <br /> ■sJ 15 <br />