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1 i 4 October 2005 <br /> . AGE-NC,Project No 05-1306 <br /> Page 2 of 4 <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> s Ground water samples were collected from each monitoring well using the dedicated, disposable <br /> bailers after allowing the well to achieve a minimum 80%recovery of the pre-purge water volume <br /> 'The samples from each well were transferred into four 40-milliliter (ml) volatile organic analysis <br /> (VOA)vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative,and into one <br /> i 1-liter amber bottle without preservative The samples were labeled with the monitoring well <br /> E designation, date,time of sampling, and the sampler's initials and transported in a chilled container <br /> under chain of custody to Kiff Analytical LLC (Kiff), a State of California Department of Health <br /> ' Services (DHS)-certified analytical laboratory, for analysis <br /> The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 826013, and <br /> ' • Total petroleum hydrocarbons quantified as diesel(TPH-d)in accordance with EPA Method <br /> 8015M <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were inferred from field data, hydrocarbon impact to <br /> ground water was quantified by laboratory analysis of the ground water samples <br /> ' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each of the monitoring wells was calculated by subtracting the <br /> ' depths to ground water from the surveyed relative casing elevations (Table 1) Depths to ground <br /> water ranged from 7 27 feet (MW-5) to 12 63 feet (MW-1) below the tops of the well casings <br /> Ground water elevation at the site ranged from 2 34 feet (MW-1)to 2 87 feet(MW-2)below mean <br /> ' sea level (MSL) During this monitoring event, ground water depths were within the screened <br /> intervals of the wells, indicating that the wells are properly screened to yield samples representative <br /> of shallow ground water conditions <br /> During the August 2005 ground water monitoring event, ground water was inferred to be flowing <br /> outward from a west-southwest-trending ridge under hydraulic gradients ranging from approximately <br /> ' 0 003 foot/foot (ft/ft) to 0 009 ft/ft Figure 3 illustrates the contoured ground water elevation as <br /> measured on 11 August 2005 <br /> Advanced GeoEnwronmental,Inc <br />