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cealagwd Tech acs Inc Page 4 GW Monitoring Report Ted Peters-AST Project No 7012 May 15, 2003 The wells were then purged of at least 3 well volumes of stagnant water using a centrifugal pump Purging continued until the temperature, conductivity and pH of the groundwater had stabilized (<10% variation among three readings) indicating that formation water representative of aquifer conditions was entering the well These water quality parameters were measured at intervals of each well volume purged The logs are included in Appendix ' C A stainless steel bailer or dedicated Wattera tubing was used to collect a sample from each ' well Care was taken to minimize sample agitation from the initial filling of the bailer to the transfer of the sample to the VOA vial and glass amber liter bottles Once the sample container was filled and capped, the bottle was then inverted, tapped and checked for ' headspace bubbles The sample container was then identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory ' All non-disposable sampling equipment was decontaminated using a steam cleaner before and between uses Disposable gloves were used by the technician to collect all samples and were changed after each sample was collected ' A chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing; a means to track their movement and ensure their integrity All water purged from each monitoring well was placed in a 55 gallon DOT approved container, properly labeled and stored on site ' 23 Groundwater Sample Analyses The groundwater samples collected on April 2, 2003, were delivered to Sherwood Labs ' (Department of Health Services Certification No 1400) of Hilmar, California, for analysis The groundwater samples were analyzed for • Benzene, Toluene, Ethyl Benzene and Xylene (BTEX) by EPA method 602 • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) ' • TEPH-D by EPA method 8015M Sherwood forwarded samples to Entech Analytical Labs Inc (Department of Health Services Certification No 2346) of Santa Claia, California, for analysis of ' . Volatile Organic Compounds by EPA method 8260B (except MW-8) Dissolved lead, gasoline oxygenates (MTBE, DIPE, ETRE, TAME, TBA), methanol & ' ethanol were not analyzed They were all non-detect for the March 2002 event and omitted in accordance with the MRP ' A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity The results and the detection limits for these analyses are listed in Table 2 of Appendix A, while the lab analytical results are presented in Appendix B