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i • <br /> • The wells will be filled with neat cement grout with about 5%bentonite powder injected into the well <br /> under pressure The grout will be placed in one continuous operation from the bottom to the top of <br /> the well, unless conditions require staging Sufficient pressure will be applied to force the grout out <br /> of the well screen into the matrix of the surrounding sand pack The pressure will be maintained for a <br /> length of time sufficient for the cementing mixture to properly set <br /> • Verification that the volume of material place in the well installation at least equals the volume of the <br /> empty well casing to assure that the well is filled and no jamming or bridging of the grout occurred <br /> • The vault will be removed and the hole in the asphalt pavement filled and sealed with concrete <br /> painted black <br /> Sincerely, <br /> L�f <br /> Gary Benvenuto, PhD <br /> Hydrogeologist <br /> CAL INC <br /> cc Margaret Lagorzo, Supervisor,Unit IV, San Joaquin County Environmental Health Division <br /> Mark R List, Engr Geologist, Underground Tanks, Sacramento Office, Central Valley Regional <br /> Water Quality Control Board <br />• <br />