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' 14 November 2002 <br /> AGE-NC Project No 95-0144 <br /> ' Page 2 of 4 <br /> ' from three of the wells (MW-2, MW-4 and MW-5) In accordance with the revised monitoring <br /> schedule established at a 03 April 1998 meeting with the EHD <br /> 2 1 WELL MONITORING AND EVACUATION <br /> A Sohnst water level meter was used to measure the depth to ground water in fourteen 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 1) <br /> After depth to water measurements were recorded, wells MW-2, MW-4 and MW-5 were purged <br /> using new, disposable plastic bailers Approximately three casing-water volumes of water <br /> (approximately 13 gallons)were removed from the purged wells Temperature,pH and conductivity <br /> of purged water were measured at regular purge-volume intervals using an Oakton water analyzer <br /> The recorded field data and logs are Included In Appendix A All purged water was stored In <br /> 1 55-gallon DOT-approved drums on-site <br /> 10 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged monitoring well using new disposable bailers after <br /> allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume Samples <br /> were transferred Into 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as <br /> a sample preservative and Into 1-liter amber bottles without preservative The samples were labeled, <br /> stored on Ice and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a <br /> California Department of Health Services (DHS)-certified analytical laboratory Each sample was <br /> analyzed for I <br /> • TPH-g, TPH-d and TPH-mo in accordance with EPA Methods 5030/8015 and 355018015, <br /> respectively, and <br /> 1 • BTEX and methyl tertiary-butyl ether(MTBE) In accordance with EPA Method 8021B, <br /> 3.0. FINDINGS <br /> ' Ground water elevation and flow direction were Inferred from field data, hydrocarbon-Impact to <br /> ground water was quantified from laboratory analysis of the ground water samples <br /> l� <br /> ' Advanced GeoEnvironmental,Inc <br />