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"h <br /> 1 <br /> • 10 February 2003 <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 25 September 2002 meeting with the EHD , <br /> 2 1 WELL MONITORING AND EVACUATION <br /> I 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, MW4 and MW-5 were purged <br /> k <br /> using new, disposable plastic bailers Approximately three casing-water volumes of water- <br /> I (approximately 12 5 to 13 gallons) were removed from the purged well-, Temperature. pH and <br /> conductivity of purged water were measured at regular purge-volume intervals using an Oakton <br /> water analyzer The recorded field data and logs are included In Appendix A All purged water was <br /> stored in 55-gallon DOT-approved drums on-site <br /> I . 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 /> 1 a sample preservative and Into 1-liter amber bottles withoutprc,servative The samples were labeled, <br /> stored on Ice and transported under chain-of-custody to McCampbell Analytic,al, Inc (MAI), a <br /> California Department of Health Services (DI-IS)-certified analytical laboratory Each sample was <br /> analyzed for <br /> TPH-g, TPH-d and TPH-mo In accordance with EPA Methods 5030/8015 and 355018415, <br /> respectively, and , <br /> ' • BTEX and methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8021B, <br /> 3.0. FINDINGS <br /> JGround 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 /> 0 <br /> 1 Advanced GeoEnviroomental,Inc <br />