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u <br /> 14 May 2000 <br /> • AGE-NC Project No 95-0137 <br /> Page 2 of 4 <br /> Temperature,pH, and conductivity were measured at regular intervals using a Hydac water analyzer <br /> Purged water was stored on-site in 55-gallon drums The field data sheets are included in Appendix <br /> A <br /> 2 2 GROUND WATER SAMPLE COLLECTION <br /> After purging and allowing a minimum 80%recharge recovery of the initial water level to each well, <br /> samples were collected using new, clean, disposable plastic bailers The samples were transferred <br /> into 40-m1 EPA-approved volatile organic analysis (VOA) vials and into 1-liter amber bottles <br /> Samples were stored in a chilled container and transported under chain-of-custody to McCampbell <br /> Analytical Laboratories (MAI) in Pacheco, California, a State of Cahfonua Department of Health <br /> Services (DHS)-certified laboratory <br /> Each sample was analyzed in accordance with the following <br /> • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g), <br /> • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as diesel (TPH-d), <br /> • EPA Method 8020 for benzene, toluene, ethylbenzene, and total xylenes (BTEX) and <br /> • EPA Method 8260 Modified for methyl-cert butyl ether (MTBE), tertiary butyl alcohol <br /> (TBA), di-isopropyl ether(DIPE), ethyl tertiary but-yI ether(ETBE) and tertiary amyl methyl <br /> ether(TAME) <br /> 3 0 FINDINGS <br /> Ground ,%aier elevations and flow direction \\ere calculated from field data and obsen atlons and <br /> petroleum-hydrocarbon impact was quantified through laboratory analysis of ground \N ater samples <br /> collected dunng the January 2000 monitoring event <br /> 3 1 GROLT'D WATER GRADIENT AND FLOW DIRECTION <br /> Depth to ground Nvater at the site ranged from 18 23 to 19 52 feet below the tops of the a ell casings <br /> The ground �N ater elevation In each well were calculated from these data The data Indicates an <br /> aN erage decrease of the relative ground water elevation at the site of 0 73 feet over the last quarter <br /> The relain e ground water elevation ranged from 79 42 to 80 38 feet The flow direction and the <br /> 4dranccd G")En\Irunrmn1a1 Inc <br />