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_ <br /> 19 June 2000 <br /> AGE-NC Project No 95-0103 <br /> Page 2 of 5 <br /> i <br /> After recordiing the depth to ground water measurements, monitonng wells MW-1 through MW-6 <br /> and vapor wells VE-1 and VE-6 were purged using a two-stage purge pump A minimum of three <br /> well-volumes of water was removed from near the top of the water column in each well i <br /> Temperature,pH and conductivity of purged ground water were measured at two-, three-, four- or <br /> five-gallon intervals, as appropriate, using a Hydac water analyzer <br /> The purge pump was washed In an Alconox solution and rinsed with tap water prior to,purging each <br /> well' Purged water was stored in 55-gallon drums on the site Field measurements of purged ground <br /> water are Included in Appendix A <br /> 22 GROUND WATER SAMPLE COLLECTION <br /> 1 r ' � u, <br /> Water samples were retneved from each purged well using new disposable bailers The samples were <br /> transferred into 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml <br /> hydrochloric acid (18%) as a sample preservative The samples were transported in a chilled <br /> container under chain-of-custody to McCampbell Analytical, Inc (MAD, a California Department <br /> of Health Services (DHS)-certified laboratory, in Pacheco, California for chemicals laboratory „ <br /> analyses Samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> r Method 8015 Modified, <br /> i <br /> • Volatile aromatic compounds benzene,toluene,ethyl-benzene and total xylenes(BTEX)and <br /> methyl-tert-butyl ether (MTBE) in accordance with EPA Method 8020, <br /> • Oxygenating fuel additives tertiary butyl alcohol (TBA), di-Isopropyl ether(DIPE), MTBE, <br /> ' ethyl tertiary butyl ether(ETBE) and tertiary amyl methyl ether(TAME) in accordance with <br /> EPA Method 8260 Modified and <br /> • 1`,2 Dlchloroethane (1,2 DCA) in accordance with EPA Method 601 and, <br /> • 1,2 Dlbromoethane (EDB) In accordance with EPA Method 8021A <br /> t <br /> E <br /> 1 r <br /> 3.0. FINDINGS <br /> Ground water flow direction and gradient were calculated from the field data The current <br /> distribution of dissolved petroleum hydrocarbons was Inferred from laboratory analytical results of <br /> the ground water samples <br /> Advanced GeoEnviron mental,Inc i <br />