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23 March 2001 <br /> AGE-NC Protect No 97-0301 <br /> ' Page 7of11 <br /> 43 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> ' logged on a chain-of-custody form laced in a chilled container and <br /> Each ground water sample was ogg y ,p <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> ' for <br /> • TPH-g, TPH-d and TPH-k by EPA Methods 8015M/5030, 8015M/3550 and 8015M/3510, <br /> • BTEX and MTBE by EPA Method 8020, <br /> ' • Methanol, ethanol,EDB, 1,2-DCA, TBA,DIPE,ETBE, TAME and MTBE by EPA Method <br /> 8260M <br /> I <br /> 5.0. QUARTERLY GROUND WATER MONITORING RESULTS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 28 December 2000, the contaminant impact to ground water was assessed from the ground water <br /> laboratory data <br /> 5 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1 through MW-7 were measured between 28 80 and 29 86 <br /> ' feet below the tops of well casings,ground water elevations were calculated to be between 25 63 feet <br /> and 26 65 feet below mean sea level Ground water elevation at the site increased an average 0 24 <br /> feet between the September 2000 and the December 2000 ground water monitoring events The <br /> ' ground water elevation data collected during the December 2000 ground water monitoring event is <br /> depicted in Figure 12 Ground water flow direction for the area bound by wells MW-1, MW-3, <br /> MW-4, MW-6 and MW-7 was generally toward the east-northeast at a gradient of 0 003 ft/ft, or <br /> approximately 16 feet per mile Ground water flow direction for the area bound by wells MW-1, <br /> MW-2, MW-6 and MW-7 was generally south at a gradient of 0 02, however these ground water <br /> elevations are suspect due to a procedural error in the field(i a initial ground water monitoring well <br /> ' levels were not all taken prior to purging at the site) and due to anomalous measurements collected <br /> at MW-2 <br /> 5 2 LABORATORY RESULTS OF MONITORING WELL WATER SAMPLES <br /> ' A total of seven ground water samples were submitted to a DHS-certified laboratory in December <br /> 2000 TPH-g was detected in water samples collected from wells MW-1 through MW-7 at <br /> Advanced GeoEnvironmentai,Inc <br />