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` of b Pzagrz'r; • WF'11 BIN-8 is located down gradient of the old tank excavation the ;i t e of h-Lghf.:st groundwater contamination readings This we'll J srj i y located in the historic dawn gradient direction according to the 1991 San Joaquin County groundwater elevation Map-, The data obtained at this well will allow us to project the dilution factor, of the aquifer and the capillary fringe The wells will be drilled with 8 inch hallow stem augers to a depth of 65 feet The present water table is located 55 feet below the surface Ten feet of 0 02 slotted 2 inch PVC easing will be placed below the water table and 10 feet will be placed above it The remainder of the well will be cased with blank 2 inch casing Number 3 ;and will be placed opposite the slotted casing, in the annular space Above the sand will be a 3 foot hydrated bentonite seal to prevent the cement seal from entering the sand, and above the bentonite the annulus will be sealed with neat gement slurry The casing will be capped with a looking cap and the well will bF- G,ealed with a traffic box cemented 'ro the surface For more details please see the QA/QC sectinn of this report The -oil and waiter samples will be tested as follows . ITEM Detection Limits Soil BTEX -- EPA 8020 Benzene 5 0 ppb Toluene 5 0 ppb Ethyl Benzene 5. 0 ppb Each Xylene 5 0 ppb TPH Soils -- D 0 H S /LOFT Manual 1 0 ppm Water BTRX EPA 602 Benzene 0 5 ppb Toluene 0. 5 ppb Ethyl Benzene 0 5 ppb Each Xylene 0 5 ppb TPH Water D 0 H S /LOFT Manual 50 0 ppb QUALITY ASSURANCE/QUALITY CONTROL PROTOCOLS The following licensed professional people will, be involved in this project Geologist Richard Morriam, Certified Engineering Geologist California Registration # 850 Envirotimental AE-se..sor John Cussen, REA 1979 Project Manager Mr Andy Younan Drillers - Will have a current C-57 Drilling license. Laboratory Will be a California State Certified Laboratory.