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I <br /> I15 May 2004 <br /> i AGE-NC Prod ect No 01-0815 <br />' Page 4 of 8 <br />' 2 2 1 Well Monitoring and Evacuation <br /> The depth to ground water in each monitoring well was measured from the top of the well casing to <br />' the nearest 0 01-foot utilizing a SoIinst water level meter Ground water elevation in each well was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevation <br /> (Table 3) <br /> After water levels were measured,approximately 6 5 gallons of water(a minimum of 3 casing-water <br /> volumes per well) were purged from monitoring wells MW-1 through MW-3 using a disposable <br />' plastic bailers Ground water temperature, pH and conductivity were measured at regular intervals <br /> during purging using an Oakton water analyzer Field sheets and data are Included in Appendix C <br /> Purged water was stored on-site in properly labeled, 55-gallon DOT-approved drums <br /> I <br /> 2 2 2 Collection and Analysis of Ground Water Samples <br /> Water samples were collected from each purged well using a disposable plastic bailer after allowing <br /> . the wells to achieve a minimum 80% recovery of the pre-purge water volume Each water sample <br /> was transferred into laboratory-supplied 40-m1 volatile organic analysis(VOA)vials containing 0 5 <br /> ml of hydrochloric acid as preservative After collection, the samples were properly labeled,placed <br />' in a chilled container and transported under chain-of-custody to CTEL, a California Department of <br /> Health Services-certified analytical laboratory, for analysis The samples were analyzed for <br /> • TPH-g in accordance with EPA Method 8015M, <br /> • BTEX and MTBE in accordance with EPA Method 8260B, <br /> • Fuel additives in accordance with EPA Method 8260B <br /> 1 <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br />' 30 March 2004 The contaminant impact to soil and ground water was quantified from the laboratory <br /> analytical data <br />' 31 STRATIGRAPHY <br /> Generally, an orange-brown, dry, clayey silt (fill material),was encountered from surface grade to <br /> approximately 6 feet bsg Orange brown to brown, dry, silts, clayey silts and silty sands were <br /> 1 Advanced GeoEnviron mental,Inc <br /> 1 <br />