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-� samples and one . field blank will be prepared. These duplicates and the ; <br /> field blank will be sent to the laboratory selected to conduct the <br /> analyses. Duplicates will also be collected for an additional 10 percent <br /> of the samples and these duplicates will be sent to a second check <br /> laboratory. Wells will be sampled twice shortly after well development. <br /> The need for and frequency of subsequent sampling will be evaluated <br /> following receipt of the analytical results from the first round of <br /> sampling. � ,.�.,�.k v'���.- <br /> Samples will be analyzed , routinely for total chromium and as--appropriate <br /> for hexavalent chromium' Temperature, conductivity, and pH measurements <br /> will be taken in the field. Chromium is the only contaminant that has been <br /> identified in groundwater in the vicinity of the MCTC facility in the past. <br /> In addition, analytical results for the last three years of monitoring <br /> indicate that virtually all of the chromium in the groundwater is <br /> hexavalent chromium. Therefore, routine analyses for total chromium ehould <br /> be sufficient to define the contaminant plume. Total chromium will be <br /> analyzed in accordance with Method 218.1, or equivalent, as cited is <br /> "Methods for Chemical Analysis of Water and Wastes", EPA, 1979. hexavalent <br /> chromium will be analyzed in accordance with Method 312.B, or equivalent, ' <br /> as cited in "Standard Methods for the Examination of Water and Wa&Aewater" , <br /> American Public health Association, 1980. Analyses will be conducted by <br /> laboratories certified by DOHS' Hazardous Materials Laboratory. <br /> 4.1.3 Storm WatMr S9mnlina <br /> i <br /> I <br /> Analyses of storm water runoff samples from the south yard and soil szunples, <br /> from the drainage ditches southwest of the south yard showed that these I <br /> samples were contaminated with wood treatment chemicals. The source of <br /> these chemicals appears to have been treated wood spacers and support <br /> pallets used in the south yard in the past. In order to rive all wood <br /> treatment residues from the south yard, an extensive yard surface cleaciing <br /> program has been implemented. After this cleaning program has been <br /> completed, additional grab samples of surface runoff will be collected from <br /> 4-10 <br />