Laserfiche WebLink
3.0 SAMPLING PROCEDURES <br /> 3.1 Simulated Rainfall <br /> Each storm water sampling area will be independently flooded using <br /> city water or, if necessary, MCTC's fire protection water supply in areas <br /> where city water is not accessible. Prior to flooding a sampling area, the <br /> sampling area's catch basin will be covered with an impervious material to <br /> minimize leakage. Sandbags will also be used as required to contain <br /> washdown water and prevent offsite discharge. All parts within a sampling <br /> area will then be uniformily washed down using a low pressure spray which <br /> simulates a moderate rainfall. Washdown will begin near the center or low <br /> spot of the sampling area in an attempt to rinse contaminants from the <br /> pavement before the central or low area becomes inundated with washdown <br /> water. <br /> 3.2 Storm Water Sampling <br /> After all areas within a sampling area have been washed down, grab <br /> samples will be collected from four equally spaced locations within the <br /> ponded water and composited to form one sample. The storm water samples <br /> will be collected in clean, one liter polyethylene bottles. After <br /> sampling, the washdown water will be released for drainage from the yard. <br /> 3.3 Internal Quality Control <br /> Duplicates, trip blanks, and background samples will be used to <br /> monitor quality control of field sampling and laboratory analysis <br /> procedures. General guidelines for internal quality control both in the <br /> field and in the laboratory are presented in Section 4.3.2.1 of the Current <br /> Work Plan. Applicable sections of the Current Work Plan have been included <br /> as an appendix to this scope of work for reference. <br /> 2 <br />