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' 17 May 2002 <br /> AGE-NC Protect No 99-0645 <br />' Page 3 of 5 <br />' 3.0. GROUND WATER MONITORING PROCEDURES <br /> The held work was performed in accordance with procedures outlined in Initial Work Plan for <br />' Preliminary S1teAssessment,prepared by AGE,dated 30 November 2000,and approved by the PHS- <br /> EHD by letter dated 13 December 2000 <br /> 3 1 MONITORING WELL EVACUATION AND MONITORING <br />' On 12 April 2002, the water level in each monitoring well was measured relative to the top of the <br /> well casing using a Sollnst water level meter After water levels were measured, a dedicated, <br /> disposable plastic bailer was used to purge each well Nine gallons (a minimum of three well <br />' volumes) of water were removed from the wells Temperature, pH and conductivity of the purged <br /> water were measured at two-gallon intervals using an Oakton water analyzer during purging,and the <br /> values had generally stabilized by the end of the purging process (Appendix A) Purged water was <br />' stored on-site in 55-gallon, Department of Transportation-approved drums <br /> 10 3 2 COLLECTION OF GROUND WATER SAMPLES <br />' Prior to collection of ground water samples,the depth to ground water was measured in each purged <br /> well to ensure that a minimum of 80% of the well volume had recharged A water sample was <br /> collected from each well using a new disposable plastic bailer Each water sample was transferred <br />' into three chilled 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid <br /> (18%) as a sample preservative and one 1-liter amber bottle After collection, the samples were <br /> labeled and placed in a chilled container for transportation under chain-of-custody to CalTech <br />' Environmental Laboratory(CalTech),a California Department ofHealth Services-certified analytical <br /> laboratory, in Paramount, California Each sample was analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA <br /> Method 8015 Modified for each molecular range of hydrocarbons, <br />' • Benzene, toluene, ethylbenzene and total xylene (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) by EPA Method 8021, and <br /> • The oxygenated fuel additives MTBE, tertiary butyl alcohol (TBA), di-isopropyl ether <br />' (DIPE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME), ethanol, <br /> methanol,ethyl-dibromide(EDB)and 1,2-dicholorethane(1,2-DCA)by EPA Method 8260 <br />' Modified <br /> • <br />' Advanced Geo Environmental,Inc <br /> 1 <br />