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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />4":!: DIA. CASED HOLE <br />FOR GROUT VENTING <br /> <br />4":!: DIA. CASED HOLE FOR <br />GROUT INJECTION <br /> <br /> <br />TEMPORARY WORK <br />BENCH ROAD ~ <br /> <br />- -..... <br />" <br /> <br />EXISTING UPSTREAM <br />FACE OF DAM <br /> <br /> <br />"- <br />" <br />"- <br />"- <br /> <br />EXISTING INLET <br />STRUCTURE AND <br />TRASH RACK <br /> <br />.......... <br /> <br />EXISTING 4" <br />AIR VENT <br /> <br />CAVITY OF UNKNOWN <br />SIZE ESTIMATED I TO 2 <br />CY. MIN, FILLED WITH <br />CEMENT -BENTONITE <br />GROUT MIXTURE <br />BY GRAVITY <br /> <br />EXISTING 36" DIA. CMP <br /> <br />EXISTING CONCRETE <br />AROUND CMP <br /> <br />18" DIA. PLASTIC PIPE <br />LINER ENCASED <br />IN CONCRETE <br /> <br />4" DIA. PLASTIC PIPE <br />AIR VENT EXTENSION <br /> <br />EXISTING TIMBER CRIBBING <br /> <br />EXISTING 2'-6"x3'-O" <br />CONCRETE ARCH CONDUIT <br /> <br />CONCRETE OUTLET <br />TRANSITION <br /> <br />o <br />, <br /> <br />5 <br />, . I <br /> <br />15 <br />, <br /> <br />10 <br />I <br /> <br />SCALE OF FEET <br /> <br />PETERSON LAKE DAM <br /> <br />19828 1983 MODIFICATIONS TO INLET STRUCTURE <br /> <br />Figure V. I <br />