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f v ^ I <br /> + <br /> 7 <br /> . 21 December 2001 <br /> s <br /> AGE-NC Project No 98-0521 <br /> Page 2 of 4 <br /> h <br /> ' The water level in monitoring wells MW-1 through MW-4 was measured relative to the tops of the ' <br /> well casings using, a Solinst water,` level meter After water levels were,measured, each well was <br /> purged utilizing a disposable bailer or 2-stage pump Six gallons (a minimum of three casing-water <br /> 1 volumes) of water were removed from wells 1VfW-1, MW-3 and MW-4 and twenty-three gallons of <br /> water were removed from well MW-2 <br /> 1 � <br /> Temperature, pH and conductivity of the purged water were measured at two-gallon intervals for <br /> MW-1, MW-3 and MW-4 and at five-gallon intervals for MW-2 Temperature,pH and conductivity <br /> of the purged water was measured using a Hydac water analyzer (Appendix B) Purged water was F <br /> ' stored on-site in 55-gallon, DOT-approved drums <br /> I r <br /> 23 COLLECTION OF GROUND WATER SAMPLES <br /> Prior to collection of ground water samples, the depth to ground water was again measured in each , <br /> ' well to ensure that a minimum of 80% of the initial well volume had recharged Water samples were <br /> collected from each well using a new disposable plastic bailer and were transferred into three 40-m1 <br /> volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample <br /> 10 preservative The samples were then,labeled and placed in a'chilled container for transportation <br /> under charm-of-custody to McCampbell Analytical, Inc, a California Department of Health Services <br /> (DHS)-certified laboratory I' <br /> r <br /> I , U <br /> 2 4 1 'GROUND!WATER SAMPLE ANALYSIS r" 1 <br /> Ground�7ater'samples were a a yzed for the following I I <br /> , <br /> '• Total petioleu'm hydrocarbons quantified as gasoline_(TPH-g ) in accordance with;EPA` <br /> tl r1 I <br /> iI ,Method 801 S Modified, '` " <br /> •'r ' BenI <br /> i ' zene,`toluene, ethyl benzenes and total xylene (BTEX)'and methyl tertiary-butyl ether <br /> (MTBE) m!accordance with,EPA methods 8020, II l <br /> ' I ' Oxygenated compounds - di-isopropyl ether (DTPE),' ethyl ,tertiary-butyl ether (ETBE), <br /> x MTBE, terti lacy-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol,„ I <br /> ethylene dibromide (EDB)' and 1,2-dichloroethane (1,2-DCA) in accordance with EPA,,' <br /> ' Method$250B <br /> lir <br /> w r + <br /> X11 <br /> Advanced GeoEnvironmeniai,Inc <br />