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26 December 1995 <br /> AGE-NC Project No. 95-0118 <br /> Page 3 of 6 <br /> For each sample, both ends of the lead tube were covered with aluminum sheets, capped and sealed <br /> with tape. The samples were then stored on ice and transported under chain-of-custody to <br /> McCampbell Analytical, Inc. (MAI) in Pacheco, California. The laboratory report and chain-of- <br /> custody form for the soil samples are enclosed in Appendix A. <br /> During drilling, auger returns were monitored for the presence of organic vapors using a photo- <br /> "1 ionization detector(PID: Thermo Environmental 580A, 10.0 eV, calibrated to isobutyIene). Auger <br /> returns were then placed on plastic sheeting and stored on-site. <br /> 3.2. LOGGING <br /> Soil was extruded from the second brass tube and screened for the presence of organic vapors, using <br /> PID, and the readings were recorded on the boring logs. The soil was then described in accordance <br /> with Unified Soil Classification System(see Boring Logs, Appendix B). <br /> 3.3. WELL COMPLETION <br /> Borings MW-4, MW-5 and MW-6 were completed as ground water monitoring wells using 2-inch <br /> _i diameter PVC casing with 0.020-inch slotted screen from depths of 28 to 48 feet bsg. The filter pack, <br /> .:, Lonestar sand#2, was installed from 26 to 49 feet. Bentonite chips were used to make a three-foot <br /> .plug and the well was grouted to the surface with Portland cement. <br /> 3.4. MONITORING WELL PURGE PROCEDURES <br /> On 14 September 1995, the water level in each well (MW-1 through MW-6) was measured relative <br /> to the top of casing using a Solinst water level meter (Table 1). After water levels were measured, <br /> approximately 5 to 6.gallons.of water(a minimum of three well volumes)were evacuated from each <br /> well using a PVC bailer. Temperature, pH and conductivity were measured at one-gallon intervals <br /> using an ICM model 52200 water analyzer. Stabilization data and field logs are included in Appendix <br /> :# C. The purged water was stored on-site in 55-gallon drums. <br /> 3.5. GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Water samples were collected from each well using a new disposable plastic bailer by transferring the <br /> collected water into 40-nil EPA vials. The samples were logged on a chain-of-custody form, placed <br /> in a chilled container and transported to McCampbell Analytical Inc. (MAI) in Pacheco, California. <br /> Each sample was analyzed for TPH-g and BTE&X in accordance with EPA methods 5030/8015m <br /> 1 <br /> I <br />