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. 22 March 2001 <br /> AGE-NC Project No 96-0229 <br /> Page 2 of 5 <br /> 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels from each well achieved a minimum of 80 percent <br /> recharge prior to sample collection Ground water samples were collected from the purged wells <br /> utilizing new,disposable polyethylene bailers and three 40-m1 EPA-approved VOA vials containing <br /> 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air <br /> bubbles were not present In the vials after filling and capping Ground water sample containers were <br /> labeled with the well designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> • Total petroleum hydrocarbons quantified as gasoline(TPH-g)by EPA Method 5030/8015M, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) and <br /> methyl-tertiary butyl ether(MTBE)by EPA Method 8020, and <br /> Fuel oxygenated compounds -methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether <br /> (DIPS), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA <br /> Method 8260 <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 01 December 2000, the contaminant impact to ground water was assessed from the laboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the December 2000 monitoring event, depths to ground water from wells MW-1 through <br /> 71,it7T 1A A 1­4­ '1F An .1 110 11"7 C_p. L..1..__ +t_ L....., F+1. 11 ,1 <br /> 1Yl YY-IV W 010 L1164JLLLGLL UGLW CCIL .LV -►V 41111 LU L/ 1GGL LJGiV W L11%, Luva vl LLLG W% Ij, baJirisa, g1Vi4AAlF <br /> water elevations were calculated to be between 15 75 feet and 17 20 feet below mean sea level <br /> Ground water elevation at the site decreased an average 1 85 feet between the August 2000 and the <br /> December 2000 ground water monitoring events, decreasing ground water elevations have been <br /> . observed at the site at least since April 2000 (Table 1) The ground water elevation data for MW-1 <br /> through MW-10 during the December 2000 ground water monitoring event Is depicted and <br /> Advanced GeoEnvlronmental,Inc <br />