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' 13 December 2004 <br /> . AGE-NC Project No 99-0645 <br />' Page 3 of 7 <br />' Analytical, Inc (MAI) in Pacheco, both laboratories are State of California Department of Health <br /> Services (DHS)-certified analytical laboratories The soil vapor samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPR-g) in accordance with EPA <br /> Method 8015 Modified and <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether <br />' (MTBE) in accordance with EPA Method 8020 <br />' 24 MONITORING WELL EVACUATION AND MONITORING <br />' On 20 October 2004, the water level in each of three monitoring wells was measured relative to the <br /> top of the well casing using a Solinst water level meter After water levels were measured, a <br /> dedicated, disposable plastic bailer was used to purge each well One and one-half gallons (a <br />' minimum of three well volumes) of water were removed from the wells Temperature, pH and <br /> conductivity of the purged water were measured at one-gallon intervals using an Oakton water <br /> analyzer during purging The values had generally stabilized by the end of the purging process <br />'• (Appendix B) Purged water was stored on-site in 55-gallon, DOT-approved drums <br />' 25 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' Prior to collection of ground water samples, the depth to ground water was re-measured in each <br /> purged well to ensure that a minimum of 80% of the well volume had recharged Then a water <br /> sample was collected from each well using a new disposable plastic bailer Each water sample was <br />' transferred into three chilled 40-m1 volatile organic analysis (VOA) vials containing 0 5-ml <br /> hydrochloric acid(18%) as a sample preservative and one 1-liter amber bottle After collection,the <br /> samples were labeled and placed in a chilled container for transportation under chain of custody to <br />' CTEL,a California DHS-certified analytical laboratory,in Paramount,California Each sample was <br /> analyzed for <br />' • TPH-g and diesel (TPH-d) by EPA Method 8015M, <br /> • BTEX and the oxygenated fuel additives MTBE, tertiary butyl alcohol (TBA), dl-isopropyl <br />' ether(DIPE),ethyl tertiarybutyl ether(ETBE)and tertiary amyl methyl ether(TAME),ethyl- <br /> dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260 Modified <br /> • <br />' Advanced GeoEnvironmental,Inc <br />