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' 04 May 2005 <br /> AGE-NC Project No 95-0142 <br /> Page 3 of 9 <br />' 0 BTEX in accordance with EPA 8260B, <br /> • Fuel additives di-isopropyl ether(DIPS),ethyl tertiary-butyl ether(ETBE),MTBE, tertiary- <br /> amyl methyl ether (TAME), tertiary butanol (TBA) also in accordance with EPA Method <br />' 8260B, and <br /> • pH - effluent in accordance with EPA Method 150 1 <br /> 1 <br />' 23 GROUND WATER MONITORING <br /> Monitoring and sampling was performed in accordance with guidelines issued by the Central Valley <br />' Regional Water Quality Control Board (CVRWQCB) and conforms to ground water monitoring <br /> guidelines issued by the San Joaquin County Environmental Health Department(EHD) In addition, <br /> field work was conducted in accordance with the EHD-approved work plan Installation of Depth <br />' Discrete Wells, dated 10 December 1999 <br />' 2 3 1 Well Monitoring and Purging <br /> On 13 January and 29 March 2005, a Solinst water level meter was used to measure the depth to <br />' ground water in eight monitoring wells(MW-1 through MW-8)and selected vapor wells(VW-2 and <br /> VW-4) After groundwater depth measurements,a minimum of three casing-water volumes ofwater <br /> were removed from monitoring wells MW-4 through MW-8 using dedicated polyethylene tubing <br />' and a Waterra inertia pump During the March monitoring event the vapor well VW-4 was also <br /> purged with a dedicated, disposable bailer and monitored The top of the screened interval in wells <br />' MW-1 through MW-3 was approximately 15 feet below static water level, therefore, these wells <br /> were not purged or sampled <br /> Temperature,pH,and electrical conductivity were measured at regular purge-volume intervals using <br /> an Oakton water analyzer Purge water stabilization field data sheets are included in Appendix B <br /> Purged water was transferred from a Department of Transportation(DOT)-approved 55-gallon drum, <br /> pumped into the on-site ground water treatment system for disposal <br /> 2 3 2 Ground Water Sample Collection <br /> After allowing the -monitoring wells to achieve a minimum of 80%recovery of the pre-purge water <br /> Ivolume, water samples were collected from each well using the dedicated polyethylene tubing <br /> Advanced GeoEnvironmental,Inc <br />