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V - 18 Jan 2' January 1 AGE-NC Project No 99-0592 Page 5 of 5 ' 2 1 MONITORING WELL PURGE PROCEDURES ' On 12 October 2000, a Solinst water level meter was used to measure the depth to ground water In domestic well DW-2 relative to the top of the well casing (well head) After the ground water depth measurement was recorded, DW-2 was purged using a Grundfos pump Approximately 140 gallons ' of water were evacuated from the monitoring well, equivalent to more than three casing water volumes ' Temperature, pH and conductivity were measured at 20-gallon intervals using a Hydac water analyzer to monitor stabilization of these ground water parameters The field data are tabulated and are included in Appendix A Purged water ls,temporanly being stored on-site in 55-gallon drums I , s On 20 December 2000, a Solinst water level meter was used to measure the depth to ground water in monitoring well MW-1 relative to the top of the well casing (well head) After the ground water I depth measurement was collected, monitoring well MW-1 was purged using a polyvinylchloride (PVC) bailer The well was purged dry prior to sampling Approximately 4 5 gallons of water were evacuated from the monitormg well, equivalent to more than three casing-water volumes lot Temperature,pH and conductivity were measured at 1-gallon intervals using a Hydac water analyzer to monitor stabilization of these ground water parameters The field data are tabulated and are Iincluded in Appendix A Purged water is temporarily being stored on-site in 55-gallon drums 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES On 12 October 2000, a water sample was collected from domestic well DW-2 after allowing tke well to achieve a minimum 80%recovery of the pre-purge water volume On 20 December 2000, a water sample was collected from monitoring well MW-1 using a new disposable bailer after allowing the I well to achieve a minimum 80% recovery of the pre-purge water volume Additionally, a water sample was collected from domestic well DW-1 after the well purge valve was opened and water was allowed to run until the pump turned on The samples were transferred into laboratory-supplied 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative The sample vials were then labeled with well designation, date, time of sampling and the sampler's a initials The samples were transported in a chilled container under chain-of-custody to McCampbell I Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified analytical laboratory for analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasolme (TPH-g) and as diesel (TPH-d) in accordance with EPA Method 503018015-Modified and 355018015-Modified, respectively, Advanced GeoRavuonmental,Inc