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1 <br /> lie 21 February 2001 <br /> AGE-NC Project No 95-0128 <br />' Page 2 of 4 <br />' measured to ensure that a minimum of 80%well-volume recharge had been achieved prior to sampling <br /> I2 2 GROUND WATER SAMPLE COLLECTION <br /> A water sample was collected from each well using a new disposable plastic bailer Immediately <br />' upon retrieval, samples were transferred into three 40-milliliter(ml)EPA-approved volatile organic <br /> analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid(sample preservative) and into one <br /> 1-liter amber bottle without the preservative Samples were placed in a chilled container and <br />' transported under chain-of-custody to McCampbell Analytical Inc (MAI), a California Department <br /> of Health Services (DHS)-certified laboratory The ground water samples were analyzed for <br /> I Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified, <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> in accordance with EPA Method 8020, and <br /> . Oxygenated compounds di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl <br /> tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> methanol, ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in <br /> Iaccordance with EPA Method 8260m <br /> 3.0. FINDINGS <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The ground water elevation on 26 January 2001 ranged from 16 59 to 17 31 feet below mean sea <br /> level (MSL) The average ground water elevation during this monitoring event was approximately <br /> 0 15 feet lower than the average ground water elevation during the November 2000 monitoring <br /> event The depth to ground water and ground water elevation data is summarized in Table 1 The <br /> ground water table occurred within the screened intervals of the shallow screened wells The <br /> screened Intervals in mon:±oring ;yells MW-1 to `��_3� MW-11B and MW-12B are currently <br /> drowned <br />' Ground water was determined to be flowing to the northeast In both the shallow screened wells and <br /> the deep screened wells (Figures 3 and 4) The gradient for the shallow screened wells was <br /> approximately 0 003 feet/feet The gradient determined for the drowned wells was approximately <br /> . 0 002 feet/feet <br /> IAdvanced GeoEnvironmental Inc <br />