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1 <br />' 26 April 2002 <br /> AGE-NC Project No 95-0128 <br />' Page 2 of 7 <br /> discharged into the active ground water treatment system for disposal Following purging,the depth <br /> to ground water was measured to ensure that a minimum of 80% well-volume recharge had been <br /> achieved prior to sampling, except well MW-9 <br /> 2 2 GROUND WATER SAMPLE COLLECTION <br /> A water sample was collected from each well using a the plastic bailer Immediately upon retrieval, <br /> the samples were transferred into three 40-milliliter (ml) EPA-approved volatile organic analysis <br /> I (VOA) vials containing 0 5 ml 18% hydrochloric acid (sample preservative) and into one 1-liter <br /> amber bottle without the preservative The samples collected were logged on a chain-of-custody <br /> form,placed in a chilled container and transported to McCampbell Analytical Inc (MAI)ofPacheco, <br />' a California Department of Health Services (DHS)-certified laboratory for analysis The ground <br /> water samples were analyzed for <br />' Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 <br /> Modified, <br /> • Total petroleum hydrocarbons quantified as diesel (TPH-d)by EPA Method 8015 Modified, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl-tertiary butyl ether(MTBE) by EPA Methods 8020 and <br /> • Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), <br /> methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol <br /> (TBA),methanol, ethanol, ethylene dibromide(EDB)and 1,2-dichloroethane(1,2-DCA)in <br /> accordance with EPA Method 8260 Modified <br /> 3.0. INTERIM REMEDIATION PROCEDURES <br /> On 12 October 2001,ground water pumping(interim remediation)was initiated through extraction <br /> well EW-1 Dunng the later portion of the final quarter of 2001 and the first quarter of 2002, the <br /> pump was operated 24 hours a day at an average extraction flow rate of 3 5 GPM Extracted ground <br /> water was piped directly into the ground water treatment system and filtered with granular activated <br /> carbon (GAC) and Sunsolve <br /> On 28 December 2001,an additional 1,000-pound granular activated carbon/sun-salve media(GAC- <br /> liquid <br /> GAGliquid <br /> phase filtration media)vessel was installed on the effluent line to remove a detected discharge <br /> of MTBE Later, on 29 January 2002, the two 1,000-pound granular activated carbon media was <br /> • replaced to refresh the systems adsorption capacity <br /> Advanced GeoEnvironmental Inc <br />