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2.0 PROPOSED SAMPLING AREAS <br /> The storm water sampling is designed to evaluate storm water quality from <br /> areas which had been used for treated wood storage prior to extensive South <br /> Yard cleanup efforts completed in 1987. The proposed storm water sampling <br /> areas, the existing patterns of South Yard runoff, and the limits of <br /> previous wood storage areas are illustrated on Figure 1. Although the <br /> South Yard is relatively flat, existing storm water runoff drainage <br /> patterns can be used to define segregated runoff areas. <br /> 3.0 SAMPLING PROCEDURES <br /> 3.1 STORM WATER SAMPLING <br /> Storm water runoff will be collected during the initial stages of a <br /> rainfall event. Prior to an anticipated rainfall event, the catch basins <br /> within the sampling areas will be covered with an impervious material to <br /> minimize leakage. After rainfall has ponded within the sampling areas , <br /> grab samples will be collected from four equally spaced discrete locations <br /> within each sampling area. The storm water samples will be collected in <br /> clean, one liter polyethylene bottles . The discrete samples for each area <br /> will be composited in the laboratory to form one sample for each area. <br /> After sampling, the ponded storm water will be released for drainage from <br /> the yard. <br /> 3.2 INTERNAL QUALITY CONTROL <br /> Duplicates, trip blanks, and background samples will be used to monitor <br /> quality control of field sampling and laboratory analysis procedures. <br /> General guidelines for internal quality control both in the field and in <br /> the laboratory are presented in Section 4.3.2.1 of the Current Work Plan. <br /> Applicable sections of the Current Work Plan have been included as an <br /> appendix to this scope of work for reference. <br /> 2 <br />