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1 i <br /> 27 February 2004 <br /> AGE-NC Project No 95-0144 <br /> Page 4 of 7 <br /> 2 16 Well Head Survey <br /> On in October 2003,a Caliform a state-licensed survey engineer from Mid Coast Engineers surveyed <br /> ' the elevation at the top of the well casing of monitoring well MW-25 to the nearest 0 01-foot relative <br /> to Bench Mark NAD 1983 (NAVD #88 The results of the monitoring well survey are contained in <br /> Table 2 The surveying report (Mid Coast Engineers) is presented in Appendix B <br /> 1 ' <br /> 2 2 WELL MONITORING AND PURGING <br /> A Solmst water level meter was used to measure the depth to ground water in sixteen monitoring <br /> wells at the subject site relative to the tops of the well casings The ground water elevation, flow <br /> ' direction and hydraulic gradient were determined from these data(Table 2) <br /> After depth to water measurements were recorded, wells MW-2, MW-4, MW-5 and MW-25 were <br /> purged using new, disposable plastic bailers, monitoring well MW-25 was purged using a Waterra <br /> inertial pump equipped with 5/8"tubing and a foot-check valve Approximately three casing-water <br /> volumes of water (approximately 12 to 16 25 gallons) were removed from the purged wells <br /> Temperature,pH and conductivity of purged water were measured at regular purge-volume intervals <br /> using an Oakton water analyzer The recorded field data and logs are included in Appendix C All <br /> ' purged water was stored in 55-gallon DOT-approved drums on-site <br /> ' 2 3 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from wells MW-2, MW-4 and MW-5 using new disposable bailers, <br /> water samples were collected from MW-25 from the discharge tube of the Watera pump Water <br /> samples were collected from each purged well after allowing the wells to achieve a minimum 80% <br /> recovery of the pre-purge water volume Samples were transferred into 40-ml EPA-approved volatile <br /> ' organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and <br /> into 1-liter amber bottles without preservative The samples were labeled, stored on ice and <br /> transported under chain-of-custody to' McCampbell Analytical, Inc (MAI), a DHS-certified <br /> ' analytical laboratory Each sample was analyzed for <br /> a TPH-g and TPH-d in accordance with EPA Methods 5030/8015 and 3 51018015,respectively, <br /> ' and , <br /> • BTEX and MTBE in accordance with EPA Method 8021B <br /> t ' <br /> y i Advanced GeoEnviron mental,Inc <br />