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31 January 2005 <br /> • AGE-NC Project No 99-0592 <br />' Page 2 of 4 <br />' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> The collected samples were transferred into laboratory supplied 40-m1 EPA-approved volatile <br />' organic analysis(VOA)vials containing 0 5 mi 18%hydrochloric acid as a sample preservative The <br /> sample containers were then labeled with the well designation,date,time and the sampler's initials <br /> The samples were transported in a chilled container under chain of custody to Cal Tech <br />' Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified <br /> 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) andmeth 1 tertiary butyl ether <br /> SKI`in accordance with EPA Method 8or EPA Metho 260 and <br /> • Fuel additives di-isopropyl ether(DIPS), ethyl tertiary-butyl ether(ETBE), MTBE, tertiary <br />' amyl methyl ether(TAME),tertiary butanol (TBA), methanol, ethanol, 1,2-dibromoethane <br /> (EDB) and 1,2-dichloroethane(1,2-DCA) in accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 28 September and 17 November 2004 Laboratory analysis of ground water samples were used to <br />' quantify the impact to ground water <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> On 28 September 2004, depth to ground water was measured between 73 02 feet and 73 20 feet <br />' below the top of the well casings, ground water elevations at the site ranged from 46 37 feet below <br /> mean sea level(MSL)in MW-4 to 46 79 feet below MSL in well MW-2 The ground water flow was <br /> directed toward the west-southwest with a hydraulic gradient calculated at approximately <br />' 0 005 foot/foot (ft/ft) <br />' On 17 November 2004,depth to ground water was measured between 69 14 feet and 69 44 feet below <br /> the top of the well casings, ground water elevations at the site ranged from 42 72 feet below MSL <br /> (MW-3)to 42 79 feet below MSL(MW-4) The ground water flow was directed toward the northeast <br />' with a hydraulic gradient calculated at approximately 0 0006 ft/ft <br />' Advanced GeoEnvironmental,Inc <br /> 1 ` <br />