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)r • 31 January 1997 AGE-NC Project No 95-0125 Page 4 of 7 detected in samples collected from the containerized purged water Results of the sampling was detailed in the above-mentioned AGE Quarterly Report, dated 26 February 1996 30 PROCEDURES 3 1 MONITORING WELL PURGE PROCEDURES On 05 November 1996, the depth to ground water in all wells was measured relative to the casing top using a Solinst water level meter The relative ground water elevation in each well and prevailing hydraulic gradient were determined from these data Ground water depth data is presented in Table 1- Relative Ground Water Elevations After depth to water measurements were performed, a pre-cleaned bailer or submersible pump was used to remove approximately eight to twelve gallons of standing water from monitoring wells MW- 1, MW-5, MW-6 , MW-7, MW-8, MW-9 and MW-10 to stabilize temperature, pH and conductivity A pre-cleaned PVC bailer was used to remove approximately one-half of a gallon of standing water from MW-2 Stabilization parameters were measured at regular intervals in each purged well using an ICM Water Analyzer Purged water was stored on-site in DOT drums Ground water stabilization and field data sheets are included in Appendix A 3 2 GROUND WATER SAMPLE COLLECTION On 05 November 1996, ground water samples were collected from monitoring wells MW-1, MW-2, MW-5, MW-6 , MW-7, MW-8, MW-9 and MW-10 These monitoring wells were sampled in accordance with the request of the PHS-EHD Samples were retrieved from the two wells using new disposable plastic bailers Each sample was collected in 40-m1 EPA vials and transported in a chilled container under ice, under a chain-of- custody to Alpha Analytical Laboratories, Inc (AAL) in Ukaih, California I Each sample collected was analyzed for total petroleum hydrocarbons quantified as gasoline (TPH- g),volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) and methyl tert-butyl ether(MTBE) in accordance with EPA methods 5030/8015m, 602 and 602, respectively 3 3 SOIL AERATION AND SAMPLING Approximately 250 cubic yards of excavated soil was transferred into an aeration cell on the western