SITE INFORMATION AND CORRESPONDENCE

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APPENDIX A SURFACE SOIL SAMPLING The locations selected for surface soil sampling will be investigated at depths of one and three feet below the ground surface. At each location, a hole will be excavated by backhoe to the sampling depth. Once the excavated depth is reached, a clean stainless steel spoon will be u ed to expose fresh soil. A new 2.5-inch O.D. stainless steel sampling sleeve will then be driven into the exposed soil. A soil core (contained In the stainless steel sleeve) will be recovered, wrapped In Teflon sheeting, capped, and taped closed. All samples will be labeled as to depth, location, soil type, and sample tracking. Two samples, a primary and duplicate, will be collected from each sampling depth for analysis. ' All sampling equipment will be washed with a TSP soap solution between sampling depths and locations to minimize the potential for cross-contamination. t SEDIMENT SAMPLING o Sediment samples will be collected by scraping a�ay the near surface j layer (± 1 inch) with a clean stainless steel spoon and driving a new 2.5-inch O.D. stainless steel sampling sleeve Into the exposed so 1. A sample core (contained in the stainless steel sleeve) will be recovered, wrapped in Teflon sheeting, capped, and taped closed. All samples will be labeled as to location and sample tracking. Two samples, a primary and duplicate, will be collected from each sampling location for analysis. All sampling equipment will be washed with a TSP soap solution between sampling depths and locations to minimize the potential for cross-contamination. WELL EVACUATION AND SAMPLING METHOD The procedures to be followed during groundwater sampling are described belowt ° To prepare for sampling, a minimum of three to live casing volumes of groundwater will be evacuated from the well. This will be accom- plished using the well's dedicated submersible puinp. Measurements of pH, temperature and conductivity will be taken during the evacuation and the well allowed to stabilize prior to sampling. ° Final readings will be recorded for pH, temperature and conductivity. Standards of, known pH and conductivity will be -used to check the calibration of the field meter before the water parameters are measured. The pH meter will be calibrated daily in order to assess whether the error is less than 0.1 percent. ° The sample bottles will be filled with groundwater and placed in a cooler with ice. The bottles will be opened only as long as neces- sary to take the samples. All samples will be collected at a pump discharge port nearest to the well head.