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1 1 � 1 � I 1 ` I 11 1 11 r r 1 n 06 August 2003 AGE-NC Project No 95-0144 ' Page 2 of 5 I ' On 08 April 2003, depth to'water was measured In the fifteen ground water monitoring wells at the site, and ground water samples were collected from each well, In accordance with the revised monitoring schedule established at a 25 September 2002 meeting with the EHD 21 WELL MONITORING AND PURGING ' ed to measure the depth to round water in fifteen monitoring , A Solxnst water level meter was used p g g ' wells at the subject site relative to the tops of the well casings The ground water elevation, flow direction and hydraulic gradient were determined from these data(Table 1) 1 ' After depth to water measurements were recorded, wells MW-1, MW-2, MW-4, MW-5, MW-11, MW-12, MW-13, MW-18, MW-19A/B, MW-20A/B and MW-21A/13 were purged using new, disposable plastic bailers, monitoring well MW-8 was purged using a Waters inertial pump ' equipped with 518" tubing and a check valve Approximately three casing-water volumes of water (approximately 8 75 to 50 gallons) were removed from the purged wells Wells MW-19A and MW-20A were'balled dry prior to removing three casing-water volumes Temperature, pH and i l ls 'conductivity of purged water were measured at regular purge-volume,intervals using an Oakton water analyzer The recorded field data and logs are Included In Appendix A All purged water was stored In 55-gallon DOT-approved drums on-site 1 ` 1 22 COLLECTION OF GROUND WATER SAMPLES 1 1 f Water samples were collected from each purged monitoring well using new disposable bailers after allowing the wells to,achleve a minimum 80% recovery of the pre-purge water volume Samples ' were transferred into 40-m1 EPA-approved VOA vials,containing 0 5 ml 18%hydrochloric acid as a sample preservative and into 1-liter amber bottles without preservative The samples were labeled, stored on ice and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a ' California Department of Health Services (DHS)-certified analytical laboratory Each sample was analyzed for ' • TPH-g, TPH-d and TPH-mo In accordance with EPA Methods 5030/8015 and 3550/8015, respectively, r • BTEX In accordance with EPA Method 8260B and The fuel additives di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether, tertiary-butyl alcohol, ' 1,2-dfbromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA . Method 8260B Advanced GeoEnvironmental,Inc