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r 3 • �� KLEINFELDEIi <br /> ,y After the wells are developed, the aquifer is allowed to equilibrate for 24 to 48 hours. <br /> Each well is first sampled with a clear acrylic bailer to visually inspect for hydrocarbon <br /> layer or sheen. The wells can then be purged and sampled if no product layer or sheen is <br /> observed on the water. During the purging of the wells, field parameters (pH, conductivity, <br /> and temperature) are monitored. Samples are collected after the field parameters have <br /> stabilized (normally requiring the removal of five well volumes). Water sampling <br /> containers are supplied by and prepared by the laboratory. These sample containers are <br /> '-' immediately sealed after sample collection and placed in an iced cooler. At the end of the <br /> day, the water samples are delivered under chain-of-custody to an analytical laboratory <br /> certified by the state for the specified chemical analysis. <br /> 4. To prevent cross-contamination between wells, all developing and sampling equipment is <br /> thoroughly washed in a detergent solution and rinsed in distilled water or steam cleaned <br /> prior to use in the next monitoring well. <br /> SOIL CUTTINGS AND WATER DISPOSAL <br /> Drill cuttings, development water, and purge water are placed in 55-gallon drums and left <br /> r. onsite for disposal by the owner. Kleinfelder can assist in coordinating the disposal of soil <br /> and water with contractors after chemical analysis results are available. <br /> V <br /> WELL ELEVATION AND LOCATION SURVEY <br /> The relative ground surface elevations will be surveyed by a licensed surveyor for each <br /> monitoring well to the nearest 0.10 foot. In addition, the top of the PVC casings will be <br /> surveyed to the nearest 0.01 foot. The location for each monitoring well will be surveyed to <br /> the nearest 0.10 foot and referenced to site facilities. The elevations will be tied into an <br /> �-' assumed elevation or a nearby USGS bench mark. Depth to static ground water will be <br /> • measured from the top of each PVC casing. The depth to water will then be subtracted <br /> from the elevation of the top of the well casing to provide a relative potentiometric surface <br /> elevation for each monitoring well location. <br /> LO <br /> `'' 163-89-161 <br />