ARCHIVED REPORTS_QUARTERLY REPORT - THIRD QUARTER 2005

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24 October 2005 AGE-NC Project No. 98-0500 Page 7 of 11 4.1. WELL MONITORING AND EVACUATION On 29 August 2005, the depth to ground water in each well was measured to the nearest 0.01-foot from the top of each well casing utilizing a Solinst water level meter;the ground water elevation was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 3). On 29, 30 and 31 of August, dedicated Waterra tubing or disposable bailer were used to purge a minimum of 3 casing-water volumes of ground water from each well except wells MW-35 and MW-37, which were purged with a pneumatic-driven pump (Appendix E). Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals using an Oakton water analyzer/meter; the field data and logs are provided in Appendix E. Purged ground water was containerized in Department of Transportation(DOT)approved 55-gallon drums and stored on-site pending proper disposal. On 20 and 22 July 2005, AGE contracted with American Valley Waste Oil to remove 1,000 gallons of purged ground water, SVE desiccant and rinse waste water stored in 55-gallon drums from the site. The waste water was loaded into a transport truck under manifest 700-088 and 700-094 and then disposed of at Riverbank Oil Transfer (Appendix E). 4.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each purged monitoring well using the dedicated Waterra tubing or disposable bailer after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume. The samples were transferred into three 40-milliliter (ml) EPA-approved volatile organic analysis(VOA)vials containing 0.5 ml 18%hydrochloric acid as a sample preservative;care was taken to ensure that visible air bubbles were not present in the VOA vials after filling and capping, and was also transferred into 1-liter amber containers without preservative. After collection, the water samples were properly labeled, placed in a chilled container and transported under chain of custody to (DHS)-certified analytical laboratories for analysis; the samples were transported to CalTech Environmental Laboratories (CTEL) for analysis for: • TPH-g, TPH-diesel and TPH-Stoddard in accordance with EPA Method 8015 Modified; • BTEX and the fuel additives MTBE,tertiary-butyl alcohol(TBA),di-isopropyl ether(DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2-dibromoethane (EDB), and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260 and; • Dissolved lead in accordance with EPA Method 6010. • Advanced GeoEnvironmental,Inc.