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' 26 November 2001 <br /> • AGE-NC I Project No 99-0592 J r <br /> Page 4 of 6 <br />' Volatile organic compounds and fiiel oxygenates - MTBE, DIPE, ETBE, TAME, TBA, <br /> methanol, ethanol, EDB and 1,2-DCA in accordance with EPA Method 8260M <br /> 28 WELL HEAD SURVEY ' <br />' On 25 October 2001, a California state-licensed survey engineer from Baumbach & Piazza, Inc <br /> surveyed the elevation of a reference point on the top of groundwater monitoring wells MW-2, <br />' MW-3 and MW-4 to the nearest 0 01-foot relative to City of Stockton Bench Mark Datum BM#361 <br /> at 27 85 feet above mean sea level (msl) The results of the monitoring well survey are contained in <br /> Table 1 The surveying report is presented in Appendix D <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> • 05 October 2001, the contaminant impact to soil was assessed from the laboratory analytical data <br />' obtained from samples collected during the well installation <br /> 31 STRATIGRAPHY <br />' Generally,moderate orange brown, dry to moist, silt and clay were encountered from 30 feet bsg to <br /> 55 feet bsg in well borings MW-2,MW-3 and MW-4 and at 70 feet bsg in boring MW-3 Light gray <br /> to moderate orange brown, saturated, poorly graded sand and silty sand were encountered from 55 <br />' feet to 75 feet bsg in borings MW-2, MW-3 and MW-4 I - <br /> Organic vapor was not detected in the soil samples collected from the monitoring well borings PID <br />' data is'included on the boring logs (Appendix A) ; <br />' 32 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Depth to ground water could not be measured in well MW-I on 18 September 2001 due to the lack <br />' of standing water in the well Depth to ground water was measured between 62 20 feet and 62 45 <br /> feet bsg in wells MW-2,MW-3 and MW-4 on 05 October 2001 Ground water elevations at the site <br /> ranged from 35 79 feet below msl in wells MW-2 and MW-4 to 35 80 feet below msl in well MW-3 <br />' Ground water elevation data are presented on Table 1 Ground water flow direction was inferred to <br /> be toward the southeast at a very low gradient of approximately 0 0001 ft/ft Figure'3 depicts the <br /> contours for October 2001 <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />