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' 29 November 2004 <br /> AGE-NC Project No 01-0815 <br />' Page 2 of 4 <br /> Environmental Laboratories (CTEL) of Paramount, a California Department of Health Services' <br />' certified analytical laboratory, for analysis The samples were 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 including methyl tertiary-butyl ether(MTBE),di-isopropyl ether(RIPE),ethyl <br />' tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> 1 <br /> 23 SOIL AND PURGE WATER DISPOSAL <br /> On 22 April 2004, Slaby Sales,Inc of Borrego Springs,CA collected eleven 55-gallon drums of soil <br /> cuttings and approximately 330 gallons of purge water from the site The soil and purge water were <br /> transported under non-hazardous waste manifest to Filter Recycling Services of Rialto,CA an EPA- <br /> approved disposal facility A copy of the non-hazardous waste manifest can be found in Appendix C <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 28 June 2004 The contaminant impact to groundwater was quantified from the laboratory analytical <br />' data <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the June 2004 sampling event,depths to ground water ranged from 30 06(MW2)feet <br />' to 30 71 (MW3)feet below the tops of the well casings Ground water elevation at the site averaged <br /> approximately 19 36 feet below mean sea level(MSL)(Table 1) Ground water elevations decreased <br />' an average 0'65 feet since the last monitoring event During this monitoring event,the ground water <br /> levels in the wells were at least 5 71 feet below the tops of the well screens, indicating that the wells <br /> are screened properly to yield representative shallow ground water samples <br /> Ground water was inferred to be flowing towards the southeast with an average hydraulic gradient <br /> of 0 005 foot/foot(ft/ft) Figure 3 illustrates the contoured ground water elevations as measured on <br />' Advanced GeoE nvi ron mental,Inc <br /> 1 4 <br />