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' 24 January 2006 • AGE-NC-99-0570 ' Page 2 of 5 5 ' approximately 5 to 6 gallons of water were removed from wells MW-1 through MW-5 (a minimum of three casing water volumes per well) using dedicated, disposable polyethylene bailees Temperature, pH, and conductivity of purged ground water were measured at regular intervals for ' stabilization using an Oakton water analyzer Field data sheets are included in Appendix C Purged water was stored on-site in properly labeled,Department of Transportation(DOT)-approved ' 55-gallon drums pending proper disposal Following purging, the depth to ground water was re- measured to ensure that a minimum 80%well-volume recharge had been achieved prior to sampling I2 3 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' Groundwater samples were collected from wells MW-1 through MW-5 using dedicated,disposable plastic bailers Upon retrieval,the samples were immediately transferred into three 40-milliliter(ml) Environmental Protection Agency(EPA)-approved volatile organic analysis(VOA)vials containing ' 0 5 ml 18% hydrochloric acid solution as a sample preservative, and into one 1-liter amber bottle without preservative ' • At the request of the EHD,a ground water sample from the on-site domestic well(DW-1, Figure 2) was also collected and analyzed To ensure that formation water was being produced, water was ' allowed to run out of the well for approximately 20 minutes, long enough to automatically turn on the well pump Ground water was poured directly into the 40-m1 VOA vials and a 1-liter amber bottle from a valve at the well head ' All samples were properly labeled, stored in a chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health ' Services(DHS)-certified laboratory in Paramount,California Ground water samples were analyzed for the following constituents ' Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) in accordance with EPA Method 8015M, and • Benzene,toluene, ethylbenzene, and total xylenes (BTEX) and oxygenated compounds di- isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2- I dibromoethane(EDB), and 1,2-dichloroethane(1,2-DCA)in accordance with EPA Method 8260B I Advanced G@oEnvironnnental,Inc I