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rwo(O ual Technxs lice Page 4 � g Groundwater Monitoring Report Project No 724 2 February 7, 2005 is suspected, a clear disposable bailer is used to gauge the interface No free-floating product was observed during this monitoring event Well MW-6 was dry and not sampled Stagnant water in the well casing was purged using a dedicated Wattera pump as recorded in the field logs (Appendix C) The rate of well purging was monitored The wells were purged of at least three casing volumes until the groundwater parameters (temperature, conductivity, and pH) had stabilized (Appendix C) Groundwater parameter stabilization was characterized by three successive readings within 10% variance Before a sample was collected, the water level was allowed to recharge to at least 80% of the initial level All purge water removed from the monitoring well was placed in a properly labeled 55-gallon DOT (Department of Transportation 17-H) approved container and is temporarily stored on-site A dedicated Wattera pump was used to collect each sample Water samples were transferred in a manner that minimizes sample aeration during transfer of the sample into 40-m1 VOA vials preserved with hydrochloric acid All samples were checked for headspace bubbles, labeled, inserted into foam holders and placed into an ice chest cooled to 4°C for transport to the laboratory The sampling technician, while collecting all samples, wore disposable gloves A chain of custody document, listing all samples collected and their intended analyses, accompanied the samples from field to the laboratory, thereby providing a means to track their movement and ensure their integrity 1.3 Laboratory Analyses The groundwater samples collected on November 5, 2004, were delivered to Sherwood Labs of Hilmar, California (certification #1400) for analyses of • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX), MTBE by EPA method 8021(B) • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(M) The detection limits for the above analyses are listed in Table 5 of Appendix A, while the lab analytical results are presented in Appendix B The Fourth Quarter Monitoring event was performed prior to the receipt of the sJGEHD response letter requesting analysis for fuel oxygenates and lead scavengers The additional Ianalysis will be incorporated into the next monitoring event i