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30 September 2005 <br /> . AGE-NC Project No 99-0657 <br /> Page 4 of 8 <br /> removed Ground water temperature,pH,and conductivity were measured at regular intervals during <br /> purging using an Oakton water analyzer Field sheets and data are included in Appendix C Purged <br /> water was stored on-site in properly labeled DOT-approved model 17H 55-gallon drums <br /> 2 2 2 Collection and Analysis of Ground Water Samples <br /> Water samples were collected from each purged well using the disposable plastic bailers after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into one 1-liter amber bottle without sample preservative and into three <br /> 40-milliliter (ml) volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid <br /> solution as a sample preservative After collection, the samples were properly labeled, placed in a <br /> chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories <br /> (CTEL), a State of California Department of Health Services(DHS)-certified analytical laboratory, <br /> for analysis The samples were analyzed for <br /> • TPH-g and TPH-d in accordance with EPA Method 8015 Modified, and <br /> I . BTEX and the fuel additives DIPS, ETBE, MTBE, TAME, TBA, 1,2-DCA and EDB in <br /> accordance with EPA Method 8260B <br /> 3.4. <br /> FINDINGS <br /> The soil stratigraphy, ground water elevation, flow direction, and gradient were determined from <br /> field data collected on 18,20 and 31 January 2005,the contaminant impact to soil and ground water <br /> was quantified by the laboratory analytical data <br /> 31 STRATIGRAPHY <br /> Pea Gravel and orange brown silts were encountered from surface grade to approximately 5 feet bsg <br />' Orange brown to brown silts and silts with fine sands were generally encountered between 10 feet <br /> and approximately 35 feet bsg, silty sands and fine to medium sands were encountered at 40 and 45 <br /> feet bsg in borings B-1 and MW-9 and at 65 feet bsg in boring B-I Brown to light brown silts and <br />' sandy silts were encountered between 50 feet and 85 feet bsg and at 100 feet bsg in boring B-1 Clay <br /> or silt was encountered at 50 feet bsg in boring MW-9 Silty sands and medium sands were observed <br /> at 95 feet bsg and between 105 feet and 130 feet bsg <br /> Hydrocarbon-like odor was observed in the soil samples collected from boring B-1 at depths between <br /> • <br />' Advanced GeoEnvironmentsl,Inc <br /> I <br />