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Home My WebLink AboutSW6231002_Plansheet - SCM Detail_20240906 (6) A B E MIN DEPTH=2.13' I � / / WET POND (SCM 11) GENERAL NOTES: 10 ESN TOp OF p // / / / ��\ ' /l 1. PRIOR TO OR DURING CONSTRUCTION,THE CONTRACTOR SHALL NOTIFY THE REV.3j6 0 AM / � // / 1 L ENGINEER OF ANY DISCREPANCIES IN THE PLANS OR SPECIFICATIONS. / ALL/ \ // \ _ 2. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH ALL APPLICABLE FEDERAL, ( \ / \\�`/ // / \ \ \ - STATE(e.g.MINIMUM DESIGN CRITERIA),AND LOCAL STANDARDS AND a Z� L / - _ �- C o SPECIFICATIONS,HEREBY INCORPORATED BY REFERENCE.� / - - - - - 37 r / � 3. CONTRACTOR SHALL OBTAIN A COPY OF THE SITE GEOTECHNICAL REPORT.THE >0° REPORT AND ITS RECOMMENDATION SHALL BE PART OF THE STANDARDS AND N SPECIFICATIONS FOR CONSTRUCTION OF THE SCM.UPON COMPLETION OF Ln (A_ _ _ - CONSTRUCTION,CERTIFICATION OF THE SCM BY THE GEOTECHNICAL ENGINEER WILL \ > / / / I - - - - - - BE REQUIRED PRIOR TO FINAL SCM ACCEPTANCE. 41 (u,� - \111/ / YL 4. THE GEOTECHNICAL ENGINEER SHALL EVALUATE SOILS FOR SUITABILITY OF DAM ro 3 N CONSTRUCTION AND SLOPE STABILITY. 3 L 1-.8-0 / // / /, / / / / \ RIPRAP DISSIP TOR./ / / Fl\�I' EXISTING -365- \ 5. PRIOR TO PLACEMENT OF EMBANKMENT FILL,THE GEOTECHNICAL ENGINEER WILL ^ O O NCDOT CLASS'1'STONE SUPERVISE THE FOUNDATION PREPARATION AND APPROVE THE DEPTH AND EXTENT cV OF THE CUTOFF TRENCH. N Z r� / WETLANDS - - - - - - - \ m MIN LENTH-20.0' _ ' 6. THE DAM AND FOREBAY BERMS SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE MIN DEPTH MIN H 2 13'I / ?/ ' / \ FOLLOWING SPECIFICATIONS UNLESS SUPERCEDED BY THE GEOTECHNICAL U 0 / - - - - - - T _ ENGINEER'S RECOMMENDATIONS. - / / I SCM MAINTENANCE \ \ BORROW MATERIALS FOR USE AS EMBANKMENT FILL SHALL BE FREE OF +� / - _ - - - - &ACCESS EASEMENT \ BALLAST CONCRETE NOT SHOWN ORGANICS,ROOTS AND OTHER WOODY VEGETATION OR ORGANIC DEBRIS. 0 Q C I � FILL MATERIALS SHALL CONSIST OF SOILS WHICH CLASSIFY AS SC,SM,CL,CL-CH 0 4"NRS GATE VALVE AND ML IN ACCORDANCE WITH THE UNIFIED CLASSIFICATION SYSTEM OR AS \ \I' HW-11 \ MANHOLE STEPS aD L Q _ - - - - \ \ FLANGED,CAST IRON BODY @16"O.C.VERT. APPROVED BY THE GEOTECHNICAL ENGINEER. Y WITH STEM EXTENSION L (SEE NCDOT 840.66) FILL MATERIALS SHALL HAVE A MAXIMUM PARTICLE SIZE OF 3 INCHES IN MEAN `� a AND V) O L DIAMETER.FILTER DIAPHRAGM ' 'n u (SEE DETAIL SHEET C9.06) l_ 3000 PSI REINFORCED CONCRETE COLLAR FILL SHALL BE PLACED IN 8 INCH(MAXIMUM)LOOSE LIFTS UNDER THE 6" WITH 2-LAYERS#4 REBAR AROUND PIPE SUPERVISION OF THE GEOTECHNICAL ENGINEER OR THEIR REPRESENTATIVE.FILL (SEE SCM DETAIL SHEET C9.06) SHALL BE BROUGHT UP BY BENCHING INTO THE EXISTING SLOPE.A MAXIMUM - / ' _ - 4"DIP SPOOL I � � � \ \ (PE x FLANGED) 12 HEIGHT OF 2 FEET SHALL BE USED FOR EACH BENCH LIFT TAKING CARE TO n _I ®� REMOVE ROOT STRUCTURES AS THE FILL PROCEEDS.THE SURFACE OF EACH LIFT \ \ \ ®O® 24 a SHALL BE SCARIFIED PRIOR TO PLACEMENT OF THE NEXT LIFT IN ORDER TO - `' \ MIL 48"WEIR 30"RUBBER EFFECTIVELY TIE THE FILL LIFTS TOGETHER. 1 OPEN END 4"PVC /� I I - \ 48 AT NORMAL POOL GASKETED 4"SCHEDULE 80 PVC SPOOL CLASS III RCP ALL COMPACTION SHALL BE TESTED BYTHE SAND CONE METHOD(ASTM D-1556) ANN � / � / \ \\ \\ \ 3�p/ / -� Ir�- / � � � / O � � ZS � \ 4"PVC a OR NUCLEAR METHOD(ASTM D-6938)AT A RATE OF AT LEAST ONE TEST PER 5,000 \ L \III/ O - - I (TYPICAL) \ \ � � / 3, \ CLEANOUT SF PER ONE FOOT OF COMPACTED FILL THICKNESS IN GENERAL AREA FILLS AND \ .J 4` / -�y� RISER^11 - ONE TEST PER 50 LINEAL FEET PER LIFT ALONG THE BARREL. p � / _ \ � 2.50'�ORIFICE DRILLED IN 4"CAP 12 4 PVC TEE ° \ \/✓ \I // / 3�S/ I \ THE MINIMUM COMPACTION SHALL BE A MINIMUM OF 95/OF THE MAXIMUM 6" STANDARD PROCTOR DENSITY(ASTM D-698)AT MOISTURE CONTENTS VARYING / \1110 / / �O I I \ \ FROM 2 PERCENT BELOW TO 3 PERCENT ABOVE OPTIMUM MOISTURE CONTENT DETERMINED BY STANDARD PROCTOR TEST TO WITHIN 3 FEET OF THE FINAL J GRADE. `} 6" 48" 12" 7. SUBGRADE FOR THE RISER STRUCTURE AND OUTLET PIPE SHALL BE APPROVED BY THE w /MAIN POOL ~I \ \ GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT.IF THE GEOTECHNICAL ENGINEER Z j Ln REQUIRES ADDITIONAL SUBGRADE PREPARATION,THE ADDITIONAL COST SHALL BE D INVERT ELEV.368.5 I I\ \ \ \ \ 70 SCM 11 RISER DRAWDOWN DEVICE PLAN APPROVED BYTHE ENGINEER PRIORTO PLACEMENT. Q N OFF NORMAL POOL _ \ \ 3 _ 8. THE OUTLET PIPE SHALL BE BEDDED IN CONCRETE FOR 2/3 OF THE PIPE LENGTH, W O v L z 380 \\ ELEV.375.50,�OQ $�O i I � BEGINNING AT THE RISER,AND IN#78 STONE FOR 1/3 OF PIPE LENGTH TO THE � t=7 _ ��Xo0- \ Y\ OUTLET.SEE DETAILS ON SHEET C9.06. - / VEGETATED SHELF \ J 0 J 6' 9. EMBANKMENT AND SIDE SLOPES OF THE BASIN SHALL BE STABILIZED PER SEEDING Lu ELEV.375.0-376.0 \ SCHEDULE ON EROSION CONTROL DETAILS SHEET OR SODDED.SEE LANDSCAPE PLAN LjL Ln ON SHEETS L1.06 AND L1.07 FOR FURTHER PLANTING DETAILS. 0 - Zoo FORE ;AY _ / / _ _ I 10. IF,DURING CONSTRUCTION,THE SCM IS TO BE USED AS AN EROSION CONTROL Lu INVERT ELEV.370.0 ��^ 3�5;��~~ I MEASURE,THE FOREBAY BERM(S)SHALL NOT BE INSTALLED DURING THE INITIAL LLj CONSTRUCTION OR WHILE THE SCM IS USED AS AN EROSION CONTROL MEASURE. p_ _ HANDWHEEL TO 3a 11. THE FOREBAY BERM(S)SHALL BE CONSTRUCTED WITH THE SAME REQUIREMENTS, _ EXTEND 12"MIN TRASH RACK(TYPICAL) 4 i b I \ ABOVE TRASH RACK AND USING THE SAME METHODS AS THE DAM(SEE NOTE 6). AUXILIARY SPILLWAY I�~ ��I'` 38 � (SEE DETAIL SHEET C9.06) \ 12. UNLESS OTHERWISE NOTED,ALL PERMANENT STRUCTURES(e.g.RISER/BARREL,WEIR INVERT ELEV.381.0 / ~3bp -�I i \ 12„ WALLS,ETC.)ARE TO BE INSTALLED WITH THE INITIAL DAM CONSTRUCTION. / (SEE DETAIL SHEET C9.07) p0 HW 1100 �} " - \ \ \ PLACE STEM SUPPORTS / / PER MANUFACTURER'S (MIN) MANHOLE STEPS 13. FOR SITE BUILT FEATURES(e.g.WEIR WALLS,DROP STRUCTURES,BRIDGES,ETC.),THE >_ LIZ �~ � - � � \ / �� / - _ / / 385 •' ' ° \ RECOMMENDATION @16"O.C.VERT. CONTRACTOR SHALL PROVIDE STRUCTURAL DRAWINGS TO THE DESIGN ENGINEER Z FOREBAY FILTER BERM / \ \ \ RISER CREST ELEV.378.50 (SEE NCDOT 840.66) FOR REVIEW AND APPROVAL PRIOR TO CONSTRUCTION.STRUCTURAL DRAWINGS z ------ (SE��;(SEE DETAIL SHEET C9.06) / � \ SHALL BE SIGNED AND SEALED BY A PROFESSIONAL ENGINEER. O J \ \ 14. PRIOR TO FINAL GRADING OF THE SCM,THE CONTRACTOR SHALL PROVIDE U JB 1101 / / ///// \ I \\ \ \ 48"WEIR CREST ELEV.377.50 / SUFFICIENT AS-BUILT SURVEY INFORMATION TO CONFIRM THAT THE FINISHED SCM / . \ \ WILL MEET THE SPECIFIC DIMENSIONAL REQUIREMENTS APPLICABLE TO THE SCM. W e===�/ 48.59 LF 36"HPPP @_ 06% RIPRAP DISSIPATOR - w - < . \ DRAWDOWN PIPE UPTURNED 12" \ THOSE REQUIREMENTS INCLUDE: Os Z NCDOT CLASS'1'STONE - - _ TO ESTABLISH NORMAL POOL / LL OPEN END 4"PVC \ \ \ \ \ \ LL a / (D50=10") 4' \ (SECURED TO RISER WALL) t;''; • POND BOTTOM ELEVATION= 368.50 FT Q \ \ n / / / �7 Cz = MIN LENTH=12' ,3gp 36�QPP / /ti o / r / T - MIN WIDTH(W1:W2)=9':15' \' \ \ \\ NORMAL POOL ELEV.375.50 \/ / / \/ / / \/ / \/ \/� • DRAWDOWN OVERFLOW ELEVATION(NORMAL POOL)= 375.50 FT Z - i - MIN DEPTH=2 • MINIMUM SURFACE AREA AT NORMAL POOL ELEVATION= 1012" ,486 SF �+ 4'WEIR CREST ELEVATION = 377.50 FT t^ J 3000 PSI REINFORCED CONCRETE COLLAR p Z V. O N CB-1102 / \ \ 2.LE I ORIFICE / / / ;j 4"PVC \}�\ /\ WITH 2-LAYERS#4 REBAR AROUND PIPE 4'X 4'RISER CREST ELEVATION= 378.50 FT Z DRILLED IN 4"CAP \ CLEANOUT �g2,� W W � (SEE DETAIL SHEET C9.06) • LOW POINT TOP OF EMBANKMENT(AUXILIARY SPILLWAY)= 381.00 FT Q /,/ t n u 0 AVERAGE TOP OF EMBANKMENT(+/-0.1 FT)= 382.00 FT = Lu _ Lr) ss 5 ss ss / _Ss ss ss /��?� ��/��?� ��/� ;> ,�', 12" \ / \ �- g / 15. ELEVATIONS SHALL BE WITHIN 0.1 FEET OF THE ABOVE ELEVATIONS FOR EARTHWORK, AND 0.05 FEET FOR OUTLET STRUCTURE.ALL SURFACE AREAS ARE THE MINIMUM i - CB-1103 - - _ - � � / \ \ \ / \ / \ / ;;o;o; +-+---- ----- Z O AREAS.REQUEST FOR A REDUCTIONS IN THE MINIMUM VALUES WILL BE CONSIDERED O Z ' W , • W��W ° .,, W '`W W W W W W a, \ \ \ \ \ \ \ \ 4"NRS GATE VALVE '''''"'"'' ON A CASE BY CASE BA515. U - W r,'- - - • •a o , a,' ti ,. e , \" I \ \ \��\�/> 'g�\ \� FLANGED,CAST IRON BODY' n 30"RUBBER Q 4 "A ' / � . ;o;;''% 16. ONCE THE PROJECT SITE HAS BEEN STABILIZED,CONTRACTOR SHALL OBTAIN CB-1105� - ~�' 4' a' 4"DIP BOTTOM DRAIN ,%%;;;;,; GASKETED iY / / \/ / / \/ \/ >> APPROVAL BY EROSION CONTROL INSPECTOR IN ORDER TO REMOVE TEMPORARY »; _ _ 12" ,;o;;,;, - - -� - - - - - - - - - - - - - 1- - - - - � -� _ ( E CLASS III RC ER � � � (TEMPORARY SKIMMER P c/� ATTACHMENT FOR / / / / / 2 EROSION CONTROL DEVICES. z - / EROSION CONTROL) / / / / INVERT OUT- 6+0 +---- ---- ONCE ALL SEDIMENT AND EROSION CONTROL DEVICES HAVE BEEN REMOVED, J 12" / / / / / ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, THE SCM SHALL BE CONVERTED TO A PERMANENT SCM. ALL SEDIMENT SHALL BE REMOVED AND DISPOSED OF PROPERLY. 9p \ I \ \ /\ \ \ /\ \ \ /\ \ \ /\ \ \ /\ \ \ \ /\ \ \ /\' �\ \ ';'• \" °\ • \ \' \' ' FOREBAY AND VEGETATED SHELF SHALL BE CONSTRUCTED AS SHOWN ON THE •385 ONCRETEPIPE CRADLE PLAN. - \ /\ \ \ (SEE- - � VEGETATED SHELF SHALL BE PLANTED PER PLANT SCHEDULE ON LANDSCAPE W/DOWELS \ ` BALLAST CONCRETE PLAN(SEE SHEET L107). . PIPE INSTALLATION MUST PROVIDE ( DocuSignedby: @ 2'O.C.+/- / / / 1.25 CUBIC YARDS REQUIRED - �\ � - - \ (SEE DETAIL ON SHEET C9.06) '� '� A PIPE JOINT AND CONSTRUCTION JOINT 17. FINAL CERTIFICATION OF THE SCM BY A PROFESSIONAL ENGINEER LICENSED IN THE oon°P®PPS SR°° WITHIN 4'OF RISER WALL FOR STATE IN WHICH THE PROJECT IS LOCATED IS REQUIRED. o Y4'/'1� °OOo 'n - - - - M \ \ ARTICULATION AT RISER 9E86i,�°sg �a °4�kb.o°°°°�� °Oo _ °j I \ COMPACTED STONE OR PREPARED SUBGRADE CLAY LINER SPECIFICATIONS: O °° °° M AS RECOMMENDED BY GEOTECHNICAL ENGINEER NOTE: o=o, �FESS/��°o o RISER AND BALLAST CONCRETE HAVE BEEN SIZED BASED ON BUOYANCY THE CONTRACTOR SHALL INSTALL A CLAY LINER TO MAINTAIN A PERMANENT POOL AT THE �� SEAL 9� °o SCM 11 WET POND PLAN VIEW CALCULATIONS.ADJUSTMENTS TO CONCRETE DIMENSIONS ARE NOT DESIGN ELEVATION.IF THE SITE GEOTECHNICAL ENGINEER DETERMINES THAT THE o o a PERMITTED WITHOUT PRIOR WRITTEN APPROVAL.ANY DIMENSIONAL m CHANGES TO BALLAST CONCRETE BASE AND RISER MUST BE REQUESTED EXISTING SITE CONDITIONS(SOIL PROPERTIES,EXISTING WATER TABLE,ETC.)INDICATE 049066 IN WRITING AND MUST BE ACCOMPANIED BY BUOYANCY THAT NORMAL POOL CAN BE MAINTAINED WITHOUT A CLAY LINER,THE GEOTECHNICAL 0 390 �mm a 390 CALCULATIONS SIGNED AND SEALED BY A NORTH CAROLINA ENGINEER WILL PROVIDE NOTICE IN WRITING TO THE PROJECT ENGINEER THAT THE CLAY o = o a a� REGISTERED PROFESSIONAL ENGINEER. LINER IS NOT REQUIRED.IF THE CLAY LINER IS NOT INSTALLED,THE OWNER SHALL RECEIVE o�'Q°°°° °°Mod 000° o m m= A CREDIT FOR THE DELETION OF THE LINER. °0 °0000a000Oo 9/5/2024 N O O D ON �� OM UU� SCM 11 RISER DRAWDOWN DEVICE DETAIL AT A M I N I MU M,TH E CLAY LI N ER MATERIAL FOR TH E WET PON D SHALL M EET TH E v =z N� �M FOLLOWING SPECIFICATIONS: N Y �> cn�> PROPOSED GRADE oc UNIFIED SOIL CLASSIFICATION SYSTEM DESIGNATION OF CL,CH,ML,OR SC 0 15 30 385 x? o'c°? ��u)z zo 385 T mLu> » MINIMUM OF 40%PASSING#200 SIEVE �°' E 1 U z z z SCALE:1 inch=30 ft. • MINIMUM PLASTICITY INDEX OF 12 10'MIN EXISTING GROUND MAXIMUM PERMEABILITY OF 1 X 10 s cm/sec TOP OF DAM INITIAL PLAN DATE:09/20/2023 3 3 A MINIMUM OF 2 TESTS OF EACH ABOVE PARAMETER SHALL BE PROVIDED FROM REVISIONS: Q NORTHWEST SOUTHWEST NORTHEAST SOUTHEAST AN APPROVED LABORATORY ON THE LINER MATERIAL AND PRESENTED TO THE 1.-05/15/2024---- w 380 100-YR WSEL:380.0 380 I ENGINEER FOR APPROVAL PRIOR TO PLACEMENT OF THE MATERIAL. REVISED PLANS PER COMMENTS o v- T--- ------ -- -`� 2.-07/26/2024---- 0 C MIN _ 10-YR WSEL:379.1 COMPACTION TO A MINIMUM OF 95%OF THE MAXIMUM STANDARD PROCTOR z ri - --- - -- - ------------ - - - - ----- REVISED PLANS PER COMMENTS a VEGETATED SHELF DENSITY(ASTM D-698),AND WITHIN 3%OF THE OPTIMUM MOISTURE CONTENT EL.375.0-376.0 Z,06°I° MINIMUM OF 1 COMPACTION DENSITY TEST PER 2500 SQUARE FEET a 1 YR WSEL:377.7 -- --------------------- --------- ---- 4859I'F 36,NPPP @ RISER CREST:378.50 Q u FILTER DIAPHRAGM • AN IN-PLACE MAXIMUM INFILTRATION RATE OF 0.01 INCHES PER HOUR. o (SEE DETAIL SHEET C9.06) ti 12' OPEN • RECOMMENDATIONS OF THE SITE GEOTECHNICAL ENGINEER MAY SUPERCEDE u 375 TOP EL.:376.5 6 NORMAL POOL WSEL:375.50 10' 375 48"WEIR CREST:377.50 THE ABOVE SPECIFICATIONS. o STA:0+89.9 7" FOREBAY _T u + 48 THE CLAY LINER SHALL BE PLACED UNDER THE BOTTOM OF THE SCM PERMANENT POOL 48. r? MANHOLE MAIN POOL 24' OPEN AT STEPS TO A MINIMUM THICKNESS OF 8 INCHES.A MINIMUM OF 4 INCHES OF TOPSOIL SHALL BE Q 3 NORMAL POOL PLACED ABOVE THE CLAY LINER TO THE FINISHED GRADE AS SHOWN ON THE DRAWINGS NORMAL POOL:375.50 1 ELEV. n AND/OR DETAILS.CARE SHALL BE TAKEN WHEN PLACING THE TOPSOIL SO AS NOT TO `s x cV DAMAGE THE CLAY LINER.ACLAY/SOIL,NO ORGANICS,MIXTURE MAYBE USED IF THE 370 RGRCP @ 1.59°I° 370 12' j- ABOVE SPECIFICATIONS ARE SATISFIED AND WITH WRITTEN APPROVAL BY THE u 63.00 LF 3 0' 2.50"0 IN 4"PVC CAP:374.50 n ° GEOTECHNICAL ENGINEER. i 12"SEDIMENT STORAGE PRECAST CONCRETE MATERIALS NOTES: m 7 12"M IN 108" RIP RAP DISSIPATOR CONCRETE COLLAR 48"(TYPICAL) 6"MIN n 1. ALL PRECAST CONCRETE STRUCTURES SHALL CONFORM TO ASTM C913 o (SEE PLAN VIEW FOR (SEE DETAIL SHEET C9.06) (RECTANGULAR)OR C478(ROUND). a SIZING REQUIREMENTS) 58" u ,---_ 2. ALL REINFORCED CONCRETE PIPE SHALL CONFORM TO ASTM C76,CLASS III(UNLESS u 365 CONCRETE CRADLE 365 n �� OTHERWISE NOTED), (SEE DETAIL SHEET C9.06) ° \ 2.1. O-RING JOINTS(RGRCP)SHALL CONFORM TO ASTM C443&ASTM C361. #57 STONE BEDDING 30"RUBBER GASKETED NON O-RING JOINTS(RCP)SHALL CONFORM TO ASTM C990 m (SEE DETAIL SHEET C9.06) 12'MIN n GASKETED WR JOB NUMBER 02190647 y 4"DIP DRAIN CLASS III RCP ADDITIONAL REQUIREMENTS: DRN:wR DGN:WR CKD:WR E 4"BOTTOM DRAIN INVERT:369.67 360 360 30"RGRCP INVERT:369.50 Li 1. SCMS MUST BE LOCATED WITHIN COMMON OPEN SPACE,AND WITHIN AN ACCESS v ; «,; rr..... ....rr,; r «,; «, «r,,,,,,,,,,,,,,, «,; «,; «,; r ?i?;;i?,;, ,,,, ;r,; «,; r, AND MAINTENANCE EASEMENT. v 8 MIN'„n,GROUT,+„r,+,r, ..GROUT'.................: ,u SCM 11 PLAN AND 2" ,;; �oUt,;;,,; ou , 0+00 0+50 1+ D 1+50 2+DO 2+50 3+00 3+50 4+00 "' """"' """"" 2. AN OPERATIONS AND MAINTENANCE MANUAL AND MAINTENANCE AGREEMENT o 6' MIN DETAILS SHALL BE PREPARED AND PROVIDED TO THE OWNER.ADDITIONAL REQUIREMENTS o (e.g.RECORDATION OF EASEMENTS,AGREEMENTS,ETC.)MAY APPLY. _ SCM 11 WET POND PROFILE VIEW SCM 11 RISER INSIDE WALL ELEVATIONS ti SCALE H:VC9,05 A