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6� { 03 June 2002 AGE-NC Project No. 97-0360 Page 2 of 7 custody to Cal Tech Environmental Laboratories(CTEL),a State of CaliforniaDepartment ofHealth Services (DHS)-certified analytical laboratory. 2.2. LOGGING Soil was extruded from a second brass sleeve and was screened for the presence of or vapor using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID: Then-no Environmental 580A, 10.0,eV, calibrated to isobutylene);the OVM readings were recorded on the boring log. The soil was then visually described in accordance with the Unified Soil Classification =- System (see Appendix A). 2.3. WELL COMPLETIONS Pilot borings MW1 through MW5 were completed as groundwater monitoring wells using two-inch diameter PVC casing with 0.020-inch slotted screen installed from approximately 5 feet to 20 feet bsg in borings MWI, MW3, MW4 and MW5 and from approximately 30 feet to 35 feet bsg in ;: 1 '• __r boring MW2 and with blank casing extended to the surface of each well. Pilot boring EW1 was completed as a ground water extraction well using six-inch diameter PVC casing with 0.020-inch slotted screen installed from approximately 5 feet to 20 feet. The filter packs (No. 3 Lonestar sand)were installed from approximately 4 feet bsg to 20 feet bsg I . in wells MW1,MW3,MW4,MW5 and EWI and from 28 feet bsg to 35 feet bsg in well MW2. A I; ; nominal 2-foot or 3-foot bentonite chip plug was then installed above the filter packs and hydrated. The wells were then grouted to near the surface with portland cement, and water-tight,traffic-rated well boxes were installed over the wells. As-built well diagrams are depicted on the boring logs in -._ Appendix A. . ; 1 2.4. LABORATORY ANALYSES OF SOIL SAMPLES 3 Selected soil samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Method 5030/8015 Modified and 3550/8015 Modified; • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8021; and Advanced GcoEnvironmental,Inc.