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07 June 2004 <br /> AGE-NC Project No 02-0926 <br /> Page 7 of 11 <br /> ' After water levels were measured,between 6 25 and 6 50 gallons of water(a minimum of 3 casing- <br /> water volumes per well)were purged from the monitoring wells using a Waterra Inertial pump and <br /> dedicated hoses Groundwater 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 D <br /> ' Purged water was stored on-site in properly labeled, 55-gallon DOT-approved drums <br /> 1 3 3 2 Collection and Analysis of Ground Water Samples <br /> ' Water samples were collected from each purged well using dedicated tubing after allowing the wells <br /> to achieve a minimum 80% recovery of,the pre-purge water volume Each water sample was <br /> transferred into one 1-liter amber bottle without sample preservative and into three 40-ml VOA vials <br /> ' containing 0 5 ml 18% hydrochloric acid as a sample preservative and one 1-liter amber bottle <br /> without preservative After collection, the samples were properly labeled, placed, in a chilled <br /> container and transported under chain-of-custody to CTEL, a California DHS-certified analytical <br /> laboratory, for analysis The samples were analyzed for <br /> • TPH-g, TPH-d and TPH-mo in accordance with EPA Method 8015 Modified, <br /> 1• • BTEX, MTBE, TBA, DIPE, ETBE, TAME, 1,2-DCA and EDB in accordance with EPA <br /> Method 8260 <br /> 11 <br /> ' 4.0. FINDINGS <br /> The soil stratigraphy, ground water elevation, flow direction, and gradient were determined from <br /> ' field data, the contaminant Impact to soil and ground water was quantified by the laboratory <br /> analytical data <br /> ' 41 STRATIGRAPHY <br /> ' Brown to yellow-brown and reddish-brown clays, silty clays and clayey silts were encountered <br /> throughout the majority of each boring to a depth of approximately 50 feet Brown to yellow-brown <br /> clayey,sands and silty sands were encountered at 5 feet bsg in the northeast and southeast of the <br /> ' borings completed More clayey sand was encountered at 10 feet bsg in MW-1 This may be a <br /> continuation of that encountered in MW-2 Orange-brown silty sand was encountered at 20 and 25 <br /> feet bsg in MW-2 Brown to yellow-brown fine sands and clayey fine sands were encountered around <br /> ' 50 feet bsg The soil boring logs are provided in Appendix A <br /> ' Advanced CcoEnvironmenta[,Inc <br />