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L eK+ <br /> L11 September 2002 <br /> Dennis H. Catanyag <br /> San Joaquin County <br /> Environmental Health Department <br /> Page 6 <br /> L • Fuel oxygenates consisting of methyl tertiary butyl ether ("MTBE"), diisopropyl <br /> L ether ("DIPE"), ethyl tertiary butyl ether ("BTBE"), tertiary amyl methyl ether <br /> ("TAME"), and tertiary butyl alcohol ("TBA")by EPA Method 8260 <br /> L • LUFT metals consisting of cadmium, trivalent chromium, lead, nickel, and zinc <br /> by EPA Method 6010 or 6020 <br /> L • Hexavalent chromium by EPA Method 7196 <br /> Typical reporting limits for these analytical methods are included as Attachment C. <br /> L Actual reporting limits may vary due to interference or other factors beyond the <br /> laboratory's control. <br /> LBORING ABANDONMENT <br /> LBorings SB-3 and SB-4 will be backfilled using one of the following: <br /> • Grout composed of Type H cement <br /> L • Bentonite pellets or chips <br /> L • Thick bentonite slurry <br /> Backfill materials will be placed in the borings so that it extends continuously from the <br /> L <br /> bottom of the boring to the surface. Backfilling may be accomplished by one of several <br /> techniques, depending upon the backfill material to be used, the depth of the boring, and <br /> Lwhether the boring contains groundwater. Techniques that may be used are as follows: <br /> • Pour dry bentonite pellets or chips into borehole in approximately 2-foot lifts. Add <br /> L • <br /> approximately one gallon of clean water after each lift to hydrate bentonite, <br /> • Pour cement grout into borehole as a continuous lift,or <br /> L • Pour thick bentonite slurry into borehole as one continuous lift. <br /> L • Pump cement grout from the bottom of borehole using a hose or tremie pipe. Place <br /> grout as one continuous lift, or <br /> L <br /> L <br />