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1207 S. Aurora <br /> Page 2 <br /> determined by the lithology encountered during the drilling of the borings, possibly beginning at 45 <br /> feet bsg. It is recommended that this screen not cross different lithological units. The remaining <br /> four wells may be completed as single, shallow monitoring wells which will encounter first water. <br /> PHS/EHD recommends that the screen interval be from 25 feet bsg to 45 feet bsg. The selection <br /> of 25 feet bsg for the beginning of the well screen is based on groundwater levels at a nearby site <br /> on Charter Way most recently being measured at approximately'31 feet bsg, and may be modified <br /> after observation of actual field conditions once work has begun.1s <br /> To set monitoring wells the bore holes will be back-filled with either neat cement or bentonite <br /> slurry made for grout. Bentonite chips are not accepted for back-fill in San Joaquin County. <br /> Following development of the monitoring wells, groundwater samples will be collected by standard <br /> methods. The groundwater samples will be analyzed for TPHg and TPHd by EPA method 8015, <br /> BTEX by EPA method 8020, and oxygenates by EPA method 8260, as per the California Regional <br /> Water Quality Control Board guidelines (enclosed). <br /> Please submit an addendum to the work plan incorporating the above requested modifications to <br /> PHSIEHD by October 30, 1998. <br /> Please note that all field work shall be witnessed by PHSIEHD staff. Forty eight hours notification <br /> is required prior to scheduling field work. If you have any questions or comments call Lori Duncan <br /> at(209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, REHS Margare� agorio, REH <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> enclosure <br /> f <br /> cc: Mark List, CVRWQCB <br /> Claus Englehardt,AquaGeosciences <br /> Pieter Crosby, PC Toxics <br /> I <br />