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HomeMy WebLinkAboutSUB198800001 Plan - Approved Stormwater Management Plan 1989-03-08s" RE -COMMENDED SLOPE 6 :1 HIGH WATER LEDGE 41 TO 6+ WIDE SLOPE TOWARD LAKE FOR DRAINAGE AT 1% MINIMUM -10 % MAXIMUM NORMAL POOL ELEVATION ffs Applied Technology and Engineering. P. C. P. 0. Box 6217 Charlottesville, Va. 22906 n 7�.. A& P.+1E'CAST CONCRETE A•vT/- v:DrF'7'L'�X /All �-� ,9ca";i RI-51el4 m.f. 1211 TO 1811 ABOVE �\ t WATER SURFACE sM� REQUIRED SLOPE 2: I MINIMUM NORMAL POOL ILEDGE 4 TO 6 W I D I E �-,�-.E- ,,,-! �' oma` /.eSLOPE TO ... � E STABLE SLOPE TOWARD SHORE AT 5% rvas TO DETER PEOPLE OR OBJECTS FROM l�z. 2� I MINIMUM SLIDING INTO DEEEP WATER rz"r�l°E REF'. METROPOLITAN SANITARY DISTRICT OF GREATER CHICAGO SHEET I of I SCALE : NOT TO SCALE DATE: AUGUST 12, 1987 DRAWN BY. SWC REVISED: OCTOBER 281 1987 NOTE: SAFETY LEDGES REQU{RED ONLY ON RETENTION BASINS WITH A PERMANENT POOL, COLINTY OF ALBEMARLE [DEPARTMENT OF ENGINEERING .441 McINTIRE ROAD CHARLOTTESVILLE, VIRGINIA 22901-4596 (604) 296-5861 RETENTION POND SAFETY LEDGE M cA3T iv RL.NG'E j0'o//9• RPC.a' �xG"K/� cz"9.5 ,5 jr co.vc. srEi�.vcrE � / GOG1.4R.X wALL 'SCFE ✓E Csl i �✓ 1LACE oE.* TH wwirr P r4i vc�3 Cl/ 7O.GF S 'A~ rY� I CAG 00 7"L E T S TRUC TORE n!. 77-5. 4 Arotes V/CI A,11 1. The entire area to be occupied by the dam embankment shall be stripped to a sufficient depth to remove all vegetation and unsuitable material, as determined by the engineer. 2. The cutoff trench shall be excavated to bedrock or at least to 5 feet below the bottom of the outflow pipe, and backfilled with dam construction material. 3. New reinforced concrete pipes shall be laid under the dam embankment with risers and inlets as shown. The pipes under the dam _ embankment shall have seepage collars cast in place as shown. 4. Soils with a permeability of 1X-10-7cm/sec have been identified in the surrounding areas. Fill material shall be taken tram„these greas only where erosion control permits have been issued as directed by the engineer. Compaction shall be a minu-num of 95% in accordahce' ivlth the American Society for Testing and Material (ASTM) ©-1557 and within 2% of optimum moisture content.Maxim—r m,fi(t height material „of shall be 6 inches loose thickness. Where deemed necessary 'by the Albemarle County Department of .Engineering (ACDF), compaction test results shall be supplied periodically during the course of construction to the ACDF to ensure compliance with the design. Soil classification data (gradation and Atterberg limits) shall be secured for the soils actually used in the dam to assure the above noted permeability. 5. In some cases the pipes are to be in at an elevation above the natural ground. Where this occurs, backfill shall be placed and t' fVf compacted to the elevation of the top of the pipe and re -excavated to lay pipe. 9 -BE MAIRr PE COUNTY Et-,Xv INEERING D -FI ;'ABUMIE NT �� ///� ',, '� / � � r� ! �----- �_----------,_� i � .,,•mss%' = i ,_--� � i ,moi � . .✓ = J,; J.� �-_ _-_ ___s �-; � _ _.-. ' � ' �\ ��\\\\�'� , FS _ 460 -44 \ ` / / \ � / / ------' ------' =------- - '' _--_--.. // VC -1,9 9 7- zo 5-4 E rpLArs a coOSS sECznOm n.r.n.me.�. s,rom6m,o msrzosmuunnon^rmm