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4 <br />. 19 July 1995 <br /> AGE-NC-95-0109 <br /> Page 4 of 8 <br /> 3 4 MONITORING OF GROUND WATER FOR PETROLEUM HYDROCARBONS <br /> As a part of the more frequent monitoring requirement, wells MW-14 and EW-I were sampled on <br /> 18 May 1995 On 12 June 1995, quarterly monitoring procedures were performed at the site, witch <br /> also included MW-14 and EW-1 As during past monitoring events, wells MW-1 through MW-5 did <br /> not contain enough water to purge or did not recharge for sampling <br /> 3 4 1 MONITORING WELL PURGE PROCEDURES <br /> On 12 June 1995, a Sohnst water level meter was used to measure the depth to ground water in each <br /> monitoring well, prior to purging An attempt was then made to purge each well containing water of <br /> a minimum of three well volumes Except for monitoring wells MW-5 and MW-6, witch were balled <br /> dry after removing approximately 3 gallons and 0 5 gallons of water, respectively, three well volumes <br /> of water were removed <br /> Each well except EW-i,was purged using clean PVC bailers Well EW-1 was purged on using a 4- <br /> inch submersible pump Temperature, pH and conductivity of the purge water were measured at <br /> approximately 1-gallon intervals (10-gallon intervals for EW-1) using an ICM water analyzer <br /> Monitoring well stabilization data and field sheets are included to Appendix B The water was placed <br /> in labeled DOT-approved drums and stored on-site <br /> 3 4 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each well using clean, disposable plastic bailers Immediately <br /> upon retrieval, the samples were transferred into 40-m1 EPA vials preserved with hydrochloric acid <br /> and were subsequently transported to a chilled container to McCampbell Analytical to Pacheco <br /> (MAI) The samples were analyzed for TPH-g and BTE&X in accordance with EPA methods 8015m, <br /> and 602, respectively Samples from MW-7, MW-8, MW-9, MW-12, MW-13, MW-14 and EW-1 <br /> were also analyzed for volatile halocarbons in accordance with EPA method 601 The sample from <br /> MW-14 was also analyzed for ethylene dibromtde (EDB) to accordance with EPA method 601 <br /> Samples from MW-8, MW-14 and EW-1 were also collected in preserved plastic bottles and analyzed <br /> for fecal coliform by FGL Environmental in Stockton, California <br />