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O1 February 2005 AGE-NC Project No. 98-0521 Page 2 of 6 was installed on 20 May 2004. On 2I May 2004, parking blocks that had been removed during trenching and piping activities were reinstalled.The remediation system was completed,started,and sampled on 22 May 2004, then shut back down. A support stand for the sediment vessel was installed on 26 May 2004. Field notes are included in Appendix B. 2.2.1. Ground Water Remediation System The ground water treatment system is designed to operate at a maximum flow rate of up to 10 gallons per minute (GPM); therefore, each of the recovery wells was adjusted to extract ground -. water at a flow rate of approximately 2 to 2.5 GPM by extracting on an intermittent cycle from wells MW-2 and MW-4. The operation of the ground water pumps allows for a hiatus when water falls below the pump inlet to allow the well to recharge, after which the pump reactivates. The ground water treatment system operates on a batch basis:approximately 250 gallons of extracted ground water is treated and discharged, with a daily total of up to 4,000 gallons. On 22 May 2004, the system was started up and approximately 200 gallons of ground water was extracted to fill the holding tank. Approximately 100 gallons of treated water (effluent) was discharged into two 55- gallon drums. After this initial start-up, the system was shut back down. Field notes from ground water pump-and-treat maintenance and operation activities are provided in Appendix B. 2.2.2. Monitoring Procedures Upon start-up of the system,influent and effluent samples were collected and submitted for analysis. Influent and effluent samples were collected on 22 May 2004. The samples were collected into laboratory-supplied 40-m1 EPA-approved volatile organic analysis (VOA)vials containing 0.5 ml 18%hydrochloric acid as apreservative, I-liter amber bottles without preservative and 500-m1 plastic containers without preservatives. Care was taken to ensure that visible air bubbles were not present in the VOA vials after filling and capping.. All samples were labeled with the sample designation, date, time, and sampler's initials. The samples were subsequently logged on a chain of custody form,placed in a chilled container and transported to Cal Tech Environmental Laboratories (CTEL) for analysis. The samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M; • Total recoverable petroleum hydrocarbons (TRPH) by EPA Method 418.1; • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), Advanced GeoEnvironmental,Inc.