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G <br /> } 5 MONITORING RESULTS <br /> 1 <br /> The depth to groundwater was measured in each monitoring well included in this event. The <br /> depth to groundwater data was converted to elevation in reference to mean sea level for. the <br /> calculation of groundwater flow direction and gradient. <br /> The 7 groundwater samples were submitted under chain-of-custody procedures to Sequoia <br /> Analytical Laboratories of Sacramento, California. Table 2 is a summary of the analytical results <br /> for groundwater. For a complete report of the analytical results please refer to the chain-of- <br /> custody forms and laboratory analytical reports included in Appendix C. <br /> 5.1. WATER LEVELS <br /> On November 10, 2003, all 20 monitoring wells and 3 piezometers were sounded for depth to <br /> groundwater. On November 19 and 20, 2003 7 of the 20 monitoring wells were sampled (see <br /> Section 4). The depth to groundwater ranged from 45.86 feet below the top of well casing <br /> (T.O.C.) to 55.46 feet below T.O.C. <br /> The groundwater elevations ranged from —34.93 feet msl to —35.78 feet msl at the site. The <br /> groundwater gradient was calculated to be at 0.002 feet/foot, and a general direction of flow to <br /> the cast/southeast. Plate 3 shows the interpreted groundwater contours. The reported <br /> groundwater flow direction has been consistent with the historical data collected at the site. It <br /> should be noted that local groundwater in the vicinity of MW-lls, MW-1Id and MW-14 was <br /> shown to be relatively elevated above other nearby monitoring wells. The localized groundwater <br /> mound appears to be a direct result of the ozone sparging activities directed in this area. <br /> Additionally, the low water level recorded at the site in MW-DIS-15 appears to be a result of the <br /> ozone sparging activities as an increase in pressure was noted in the well. The increase in <br /> pressure appears to have had a direct effect by forcing the water level down and on the <br /> equalization of the water level in the well prior to sampling. Please refer to Table 1 for the <br /> recorded groundwater elevations on July 29, 2003 and past monitoring events. <br /> I <br /> t <br /> ! <br /> 12280.MON/ST03R 1875 Page 8 of 13 <br /> ®2004,Kleinfelder,Inc February 9,2004 <br /> KLEINFELDER 2825 East Myrtle Street, Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />