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' Geological Technics Inc Forge 4 Groundwater Monitoring Report Project No 724 2 February 3,2004 ' water level reading was recorded to an accuracy of 0 01 foot In wells where free-floating product is suspected, a clear disposable bailer is used to gauge the interface No free- floating product was observed during this monitoring event 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 Q This indicated that water representative of actual aquifer conditions was entering the well 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 13 Laboratory Analyses ' The groundwater samples collected on November 28, 2003, were delivered to Sherwood Labs of Hilmar, California (certification #1400) for analyses of _ ' • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX), MTBE by EPA method 8020 • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(M) ' The detection Iimits for the above analyses are listed in Table 4 of Appendix A, while the lab analytical results are presented in Appendix B ' As required under AB2886, the groundwater elevation and laboratory data were submitted electronically to GeoTracker on January 29, 2004 - confirination numbers 8164015054 and 7611041724