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i i i iFIELD PROCEDURES AND PROTOCOLS AGE conducted the monitoring event in accordance with guidelines established by the RWQCB and ithe PHS-EHD GROUND WATER ELEVATION MONITORING On 09 May 2001, a Solmst water level meter was used to measure the depth to ground water in ground water monitoring wells MW-1, MW-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 Well casing elevations were provided by Applied Earth Sciences Groundwater elevation in each well was determined from these I data (Table 1) Ground water elevation contours are illustrated on Figure 1 IWELL PURGING On 10 May 2001, the 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 5 to 85 gallons of water were removed from each of the wells (a minimum of 3 casing-water volumes per well) Ground watei temperature, pH and conductivity were measured at regular purge-volume intervals using Oakton 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 fiom 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 Icontrol/quality assurance Each water sample was transferred into 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After collection, the samples were properly labeled, placed in a chilled containei and transported under chain-of-custody to McCa.mpbell Analytical, Inc (MAI), a State of California Department of Health Services (DHS)-certified analytical laboratory The samples were Advanced GeoEnvaroxnuental,Itic