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r 1 ' 15 September 2005 ' • AGE-NC Project No 98-0465 Page 3 of 8 I ' using a Geoprobe water sampling assembly with a pre-cleaned, 1-inch diameter 0 01-inch slotted polyvinylchloride (PVC) screen Each sample was extracted by lowering a Teflon hose-bailer through the hollow center of the push rods into the screened section Ground water samples were ' transferred into four laboratory-supplied, 40-milliliter (ml) 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 After collection, the samples were properly labeled,placed on ice, and ' transported under chain of custody to CTEL for analysis The samples were analyzed for the petroleum hydrocarbon products listed in Section 2 2 2 5 WELL MONITORING AND EVACUATION ' On 14 April 2005, a Solinst water level meter was used to measure the depth to ground water in all four monitoring wells relative to the tops of the well casings After the depth to ground water measurements were collected,casing water in each monitoring well was evacuated using dedicated, ' disposable plastic bailers Approximately 8 0 gallons of water,the equivalent of three casing-water volumes, were evacuated from each of the monitoring wells fTemperature,pH,and conductivity of the purged water were measured at regular intervals using an Oakton water analyzer Field data logs are provided in Appendix C Purged water was containerized ' in properly labeled,75H 55-gallon Department of Transportation(DOT)-approved drums and stored on-site 2 5 1 Collection and Analysis of Ground Water Samples A ' Water samples were collected from each monitoring well using dedicated,disposable plastic bailers after allowing the well to achieve a minimum 80% recovery of the pre-purge water volume The samples from each well were transferred into three 40-milliliter(ml)volatile organic analysis(VOA) ' vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative The samples were labeled with the monitoring well designation,date,time of sampling, and the sampler's initials and transported in a chilled container under chain of custody to Cal Tech Environmental Laboratories ' (CTEL), a Department of Health Services-certified analytical laboratory, for analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015-modified, ' • Volatile aromatic compounds benzene, toluene, ethylbenzene, and xylenes (BTEX) in accordance with EPA Method 8260B, Advanced GeoEnvironmental,Inc