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. 18 January 2001 AGE-NC Project No 95-0111 Page 2 of 4 The samples were then labeled and placed in a chilled container for transportation under ' chain-of-custody to McCampbell Analytical,Inc (MAI), a California Department of Health Services (DHS)-certified analytical laboratory located in Pacheco, California Each sample was analyzed for • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d)by EPA Method 8015-modified for each range of hydrocarbons, respectively, - • Volatile aromatic compounds-benzene,toluene,ethylbenzene and total xylenes(BTEX)and methyl tertiary-butyl ether (MTBE)by EPA Method 8020, and ' • Oxygenated compounds - di-Isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), methyl tertiary butyl ether(MTBE), tertiary amyl methyl ether(TAME) tertiary butyl alcohol (TBA) by EPA Method 8260 Modified 23 SURVEYING The casing elevation of monitonng wells MW-7 and MW-8 for the Grant Line Gas and Food investigation were surveyed relative to the casing elevation of monitoring well MW-5 On 16 January 2001 AGE personnel surveyed the top of ground water monitonng wells MW-7 and MW-8 at the site to the nearest 0 01-foot relative to MW-5 at 17 37 feet above mean sea level (msl) The results of the monitonng well survey are contained in Table 1 I3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on I 19 December 2000, the contaminant impact to ground water was quantified from the laboratory analytical data 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT IThe relative ground water elevation in each well was calculated by subtracting the depth to ground water from the surveyed relative casing elevations The depths to ground water and relative ground I water elevations'are tabulated in Table 1 The relative ground water elevations ranged from 9 43 feet in MW-6 to 10 89 feet in MW-3 The ground water elevation decreased an average of 0 14 feet over the last quarter IThe ground water flow direction at the site is towards the north-northeast which is consistent with iresults obtained from previous quarterly monitonng events conducted The ground water gradient, Advanced Geolinvaronmental Inc