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' cywogtcal Techxks Ina Page 4 Groundwater Monjtormg Report Project No 724 2 November 12,2004 ' 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 nummizes 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 1 A chain of custody document, hstmg 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 July 28, 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) m 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 1 As required under AB2886, the laboratory data was submitted electronically to GeoTracker on August 8, 2004 (confirmation #3061136007) and groundwater elevation was submitted ' electronically to GeoTracker on August 27, 2004 (confirmation#9326858341)