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i' 20 October 1998 �.,.i AGE-NC Project No. 98-0470 Page 3 of 7 custody to McCampbell Analytical, Inc. (MAI) in Pacheco, California. Selected soil samples were analyzed in accordance with: EPA Method 8015m for total petroleum hydrocarbons quantified as gasoline(TPH-g), • EPA Method 8020 for volatile aromatic compounds (benzene, toluene, ethylbenzene and total xylenes: BTEX) and methyl tertiary butyl ether(MTBE) • EPA Method 8260m.for di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE),methyl tertiary butyl ether(MTBE), tertiary amyl methyl ether(TAME) and tertiary butyl alcohol (TBA).-= 3.2. SOIL DESCRIPTION AND LOGGING Soil was,extruded from the second brass sleeve and screened for the presence of organic vapor using 1W. an organic vapor meter equipped with a photo-ionization detector (PID: Thermo Environmental r 580A, 10.0 eV,calibrated to isobutylene),and the readings were recorded on the boring log. The soil was described in accordance with the Unified Soil Classification System. A typical vertical soil profile is depicted_in Appendix A. 3.3. WELL COMPLETION Boring MW-1 was completed as a ground water monitoring well. The-'well was completed using 2- inch diameter schedule 40 PVC casing with 0.02-inch slotted screen from approximately 45 to 65 feet bsg. A filter pack was installed using#2 Lonestar sand from 43 to.65 feet. Bentonite chips were' used to make a two-foot plug and the remaining annular-space was backfilled to the surface with portland cement. A traffic-rated well box (8-inch diameter) was installed over each well, in accordance with County regulations. Monitoring well construction details are also included in(are . depicted in)the boring log (Appendix A). 3.4. WELL DEVELOPMENT On 24 July 1998,a Solinst water level meter was used to measure the depth to ground water in the well relative to the top of the well casing. After the ground water depth measurement was collected, monitoring well MW-1 was purged and developed using a Grundfos stainless steel submersible pump. Approximately 16 gallons of water were evacuated from the well. Temperature, pH and conductivity were measured at 2-gallon intervals using an ICM mode152200 water analyzer. Advanced GeoEnvironmental,Inc.