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ADVANCED GEOENVIRONMENTAL, INC FIELD PROCEDURES FOR GROUNDWATER MONITORING AND SAMPLING FIELD PROCEDURES AND PROTOCOLS ' AGE conducted the monitoring event in accordance with guidelines established by the CV-RWQCB and the PHS-EHD ' GROUND WATER ELEVATION MONITORING ' On 06 March 2001, a Sollnst water level meter was used to measure the depth to ground water in ground water monitoring wells MW-1, NIW-2, MW-3, MW-3A, MW-3D, MW-4 through MW-13, MW-13A and MW-13B relative to the tops of the well casings Groundwater elevation in each well ' was determined from these data (Table 1) Ground water elevation contours are illustrated on Figure 1 ' WELL PURGING On 06 and 07 March 2001 monitoring wells were purged of standing water by utilizing a down-hole pump The down-hole pump was decontaminated prior to insertion in each well as described below Approximately 6 to 86 gallons of water were removed from each of the wells (a minimum of 3 ' casing-water volumes per well) Ground water temperature, pH and conductivity were measured at regular purge-volume intervals using ICM and Hydac water analyzers Field sheets and data are ' included in Appendix A Purged water was stored on-site in labeled, 55-gallon DOT-approved drums ' SAMPLE COLLECTION AND ANALYSIS Water samples were collected from each purged well using new disposable plastic bailers These pre- cleaned bailers are disposed of after one use, thereby minimizing cross contamination due to sampling devices The samples were drawn and collected in such a manner that agitation and ' exposure of the groundwater to the atmosphere was minimal Sample containers were filled using the appropriate disposable sampling attachment which allows controlled flow out of the bottom of the bailer A sample was also collected from the third decontamination water stage for quality control/quality assurance Each water sample was transferred into 40-ml VOA vials containing 0 S ml I S% hydrochloric acid ' as a sample preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a State of California Department of Health Services (DHS)-certified analytical laboratory The samples were Advanced GeoEnvi romitent J,Inc 1