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' 20 December 2002 AGE-NC Project No 95-0185 ' Page 4 of 7 ' The soil was then visually described in accordance with the Unified Soil Classification System(see Appendix C) ' 2 3 3 Laboratory Analysis of Soil Samples ' Selected soil samples were logged on a chain-of-custody form, placed in a chilled container and transported to McCampbell Analytical Laboratory Inc (MAI), a State of California Department of Health Services (DHS)-certified laboratory, for the following analysis ' a Total petroleum hydrocarbons quantified as stoddard solvents (TPH-ss), total petroleum hydrocarbons quantified as motor oil(TPH-mo),TPH-g and TPH-d in accordance with EPA ' Method 8015 Modified, • BTEX and the oxygenated fuel additives MTBE,DIPE,ETBE, TAME,TBA,methanol and ethanol in accordance with EPA methods 8260B, • The fuel scavengers ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in ' accordance with EPA Method 8260B ' 2 3 4 Well Completion Monitoring well MW-5 was completed utilizing a 2-inch diameter casing with 0 020-inch slotted ' screen from 10 to 30 feet bsg and blank, 2-mch diameter PVC well casing extending to the surface The ozone sparge wells were completed with a pre-fabricated 2-inch diameter, polyvinylchloride (PVC) mess diffuser and blank, 314-inch diameter PVC well casing extending to the surface The depth of the mess diffusers were from 48 to 50 feet bsg for wells OPS 1B through OSP3B, from 28 ' to 30 feet bsg for well OSP1A, from 33 to 35 feet bsg for well OSP2A, and from 38 to 40 feet bsg for well OSP3A ' Each well was installed by placing a PVC well casing assembly through the hollow stem of the augers to the total depth of the boring The augers were incrementally raised as No 3 Lonestar Lapis Luster sand(filter pack)was slowly poured down the annulus between the well casing and the inner ' wall of the hollow stem auger to approximately two feet above the screened interval A nominal two-foot bentonite seal was placed above the filter pack to minimize the potential for ' grout penetration into the screened section of the well The bentonite seal was formed by pouring bentonite pellets into the annulus and allowing them to settle on the filter pack Bentonite pellets were hydrated using five gallons of water and the pellets were allowed to hydrate for a minimum of ' one-half hour prior to installation of cement grout ' Advanced GeoEnvironmental,Inc