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' 06 October 2005 <br /> . AGE-NC Project No 01-0827 <br />' Page 4 of 7 <br />' boring advancement The boring was backfilled from the lowest point of the exploration to the <br /> surface with portland cement and covered with concrete <br />' 2 3 QUARTERLY AND MONTHLY WELL MONITORING <br />' On 12 September, the depth to ground water was measured in monitoring wells MW-1, MW-3 <br /> through MW-6 and vapor wells VW-2d and VW-5d <br /> 2 3 1 Well Monitoring and Evacuation <br />' A Solinst water level meter was used to measure the depth to ground water in each well After water <br /> levels were gauged,a Waterra inertial tubing pump or dedicated disposable bailer was used to purge <br /> monitoring wells MW-6 and vapor wells VW-2d and VW-5d of a minimum of three casing-water <br /> volumes (between 8 and 20 gallons) of ground water Temperature, pH, and conductivity were <br /> measured at regular intervals during purging using an Oakton model water analyzer Additionally, <br /> ORP in wells adjacent to the IAS wells were measured Purged water from impacted wells was <br /> stored on-site in 55-gallon drums The field data sheets are included in Appendix C <br /> I2 3 2 Ground Water Sample Collection and Analysis <br /> After allowing wells to achieve a minimum 80%recovery of the pre-purge water volume,a ground <br /> water sample was collected using the disposable bailer The sample was transferred into three <br /> 40-milliliter(ml) VOA vials The samples were properly Iabeled, stored in a chilled container, and <br /> transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California <br /> Department of Health Services (DHS)-certified analytical laboratory The samples were analyzed <br /> for <br /> • TPH-g in accordance with EPA Method 8015M, and <br /> • BTEX, and the fuel oxygenated compounds TBA, DIPE,ETBE,TAME,MTBE, 1,2-DCA, <br /> and EDB by EPA Method 8260 <br /> I3.0. FINDINGS <br /> Ground water flow directions and gradients, DO concentrations and ORP were inferred from the <br /> • field data collected on 12 September 2005 Contaminant impacts to ground water were assessed from <br /> Advanced GeoEnvironmental,Inc <br /> I <br />