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I <br />' 08 December 2004 <br /> • AGE-NC Project No 98-0511 <br />' Page 3 of 6 <br />' 2 3 QUARTERLY GROUND WATER MONITORING <br /> AGE conducted a quarterly ground water monitoring event on 21 May 2004 <br /> 2 3 1 Well Monitoring and Evacuation <br /> A Solinst water level meter was used to measure the depth to ground water in ground water <br /> monitoring wells MW-1 through MW-8 relative to the tops of the well casings The ground water <br /> elevations and gradient were determined from this data <br /> After recording water level measurements, a disposable bailer was used to evacuate (purge) each <br /> monitoring well of standing water Approximately 6 to 22 gallons of water were removed from wells <br /> MW-2 through MW-8 Monitoring well MW-1 was purged dry after 18 gallons of water had been <br /> evacuated Ground water temperature, pH, and conductivity were measured at regular intervals <br />' during the purge process using an Oakton water analyzer Field data sheets are included in <br /> Appendix B Purged water was stored on-site in properly labeled, DOT-approved 55-gallon drums <br /> 10 Following purging,the depth to ground water was measured to ensure that a minimum of 80%well- <br /> volume recharge had been achieved prior to sampling <br /> 1 <br /> 2 3 2 Collection and Analysis of Ground Water Samples <br /> IWater samples were collected from each purged well using a dedicated disposable plastic bailer <br /> Each water sample was transferred into three laboratory-supplied, 40-milliliter volatile organic <br /> analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative <br /> After collection, the samples were properly labeled, placed in a chilled container, and transported <br /> under chain of custody to Cal Tech Environmental Laboratories, a California Department of Health <br /> Services (DHS)-certified laboratory, and analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M, <br /> • Benzene,toluene, ethylbenzene, and total xylenes(BTEX)in accordance with EPA Method <br /> 8260B, and <br /> • Fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), methyl tertiary- <br /> butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), <br /> ethylene dibromide (EDB), 1,2-dichloro ethane (1,2-DCA), ethanol, and methanol in <br /> accordance with EPA Method 8260B <br /> Advanced GeoEnvnron mental,Inc <br />