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01 February 2005 AGE-NC Project No. 98-0521 Page 3 of 6 tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) by Method SW846 8260B; • pH in accordance with EPA Method 150.1.; • Metals: Cd, Cr, Cu, Pb, Ni and Zn in accordance with EPA Method 200.7; and • Total Toxic Organics by EPA Methods 624 and 625. 2.3. WELL MONITORING AND EVACUATION _ On 26 May 2004, a Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-5 relative to the tops of the well casings. After water levels were measured, each well was purged utilizing a disposable bailer or Waterra inertial pump. Approximately 6 gallons (a minimum of three casing-water volumes) of water were removed from wells MW-1,MW-3 and MW-4;approximately 25 gallons of water were removed from well MW-2 and approximately 24 gallons of water were removed from well MW-5. Temperature, pH and conductivity of the purged water were measured at regular intervals for each well, using an Oakton water analyzer. Field sheets are in Appendix C. Purged water was stored on- site in 55-gallon, Department of Transportation (DOT)-approved drums. _ 2.4. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Prior to collection of ground water samples, the depth to ground water was measured again in each well to ensure that a minimum of 80%of the initial well volume had recharged. A water sample was collected from wells MW-1,MW-3 and MW-4 using disposable plastic bailers; a water sample was collected from wells MW-2 and MW-5 using the Waterra tubing. For the May 2004 sampling event, the samples were transferred into three 40-m1 volatile organic analysis (VOA) vials containing 0,5 ml hydrochloric acid (18%) as a sample preservative. The samples were then labeled and placed in a chilled container for transportation under chain of custody to McCampbell Analytical, Inc. (MAI),a California Department of Health Services(DHS)-certified laboratory. The collected ground water samples were analyzed for the following: r Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA _ Method 8015M; • Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method _ 8021B; and .Advanced GeoEnvironmental,Inc.