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..e Frank C.Alegre Trucking Company,Inc. 4203-F2A Former Trucking Facility January 31, 1997 WORK PLAN FOR DRAINAGE Revised February 25, 1997 POND INVESTIGATION(PHASE ONE) Page 3 Central Pond Area Boring The boring within the pond will be advanced through the base of the fill materials, into the underlying native soil. The estimated depth of the boring is 30 feet. Continuous soil samples will be recovered using a 3-inch-diameter modified California sampler, equipped with 21/ inch- diameter sampling tubes. Representative soil samples retained for laboratory analysis will be selected based on field observations by both ENGEO and San Joaquin Environmental Health Department personnel. Following recovery,the soil samples will be sealed with Teflon sheets,tape and polyethylene end caps. The samples will be placed in a cooled ice chest for transportation to the analytical laboratory under documented chain of custody. Perimeter Boring-Ground-Water Sampling The perimeter soil boring will be advanced down into the local unconfined aquifer. Once the saturated zone has been encountered, the boring will be advanced an additional five feet below the top of the ground-water table. ENGEO estimates the total depth of the boring will be in the range of 40-50 feet below the ground surface. A temporary 2-inch-diameter PVC casing with a .010 slotted screen,will then be placed within the hollow stem auger to facilitate ground-water sampling. The sample will be recovered using a disposable polyethylene bailer. The sample will then be transferred into clean laboratory glassware,for transport to the analytical laboratory. A VOC travel blank, provided by the analytical laboratory, will be included with the ground-water samples throughout transport. Laboratory Analysis The soil and ground-water samples will be tested for the following compounds: • Total Volatile and Extractable Hydrocarbons(EPA 8015) • Total Recoverable Hydrocarbons(EPA 418.1) • Organochlorine Pesticides(EPA 8080) • Volatile Organics(EPA 8240) • Title 22 Metals Soil samples exhibiting pesticides, VOCs, or metals in excess of state STLC or federal TCLP standards will be analyzed for soluble fractions. Laboratory services will be provided by American Environmental Network(AEN)in Pleasant Hill, California(DOHS#1172).