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15 June 2004 <br /> . AGE-NC Project No 01-0815 <br /> Page 4 of 8 <br /> I <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 to 13 gallons of water(a minimum of 3 casing- <br /> water volumes per well)were purged from monitoring wells MW-1 through MW-4 using 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 />' 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 <br /> 0 5 ml of hydrochloric acid as preservative After collection, the samples were properly labeled, <br /> placed in a chilled container and transported under chain-of-custody to CTEL for analysis The <br /> samples were analyzed for <br /> TPH-g to 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 /> 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 groundwater 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 and clayey silts were encountered from <br /> approximately 6 feet bsg to 26 feet bsg Orange brown to blue grey hydrocarbon stained, slightly <br /> moist, clay was encountered from approximately 26 feet to 36 feet bsg in MW1, MW2 and MW3 <br />' and from 20 to 24 feet bsg in the area of MW4 Gray hydrocarbon stained, moist to saturated silty <br /> sand was encountered from approximately 36 feet bsg to 53 feet bsg Saturated soil was encountered <br />' Advanced GeoEnironmental,Inc <br />