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' 06 August 2004 . AGE-NC Project No 95-0128 ' Page 3 of 11 ' 2 2 GROUND WATER MONITORING AND SAMPLING On 29 March 2004,a ground water monitoring and sampling event was conducted on the monitoring well network 2 2 1 Ground Water Monitoring and Purging On 29 March 2004, a Sollnst water level meter was used to measure the depth to ground water in ' monitoring wells MW-1 through MW-18 and vapor well V W 1 The groundwater elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 2) ' On 29 March 2004,a minimum of three casing-water volumes were purged from wells to be sampled using a Watera Inertia pump or disposal bailer, except for well MW-9, which was purged dry prior ' to the removal of the three volumes Temperature,pH and conductivity of purged ground water were measured at various Intervals,depending on the volume ofwater In each well,using an Oakton water analyzer The field data and field sheets are included In Appendix B Purged water was discharged lie into the active ground water treatment system for treatment and disposal ' 2 2 2 Ground Water Sample Collection ' A water sample was collected from each monitoring well using a new disposable bailer after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Immediately upon retrieval, the samples were transferred Into three 40-milliliter(ml) EPA-approved VOA vials ' containing 0 5-ml 18%hydrochloric acid(sample preservative)and one 1-liter amber bottle without preservative The samples collected were logged on a chain of custody form, placed in a chilled container and transported to Cal Tech Environmental Laboratories(CTEL),a Cali form a Department t of Health Services(DHS)-certified laboratory,for analysis The groundwater samples were analyzed for • TPH-g and TPH-d In accordance with EPA Method 8015 Modified, • BTEX in accordance with EPA Method 8260B, and • Fuel additives RIPE, ETBE, MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA),methanol, ethanol, 1,2-dibromoethane(EDB) and 1,2-dichloroethane(1,2-DCA) in accordance with EPA Method 8260B i ' Advanced Geo Environmental Inc