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Home My WebLink AboutSW6231002_Plansheet - SCM Detail_20240805 (4) A v E WET POND (SCM 9) GENERAL NOTES: 1. PRIOR TO OR DURING CONSTRUCTION,THE CONTRACTOR SHALL NOTIFY THE ENGINEER OF ANY DISCREPANCIES IN THE PLANS OR SPECIFICATIONS. o co, \ \ / BALLAST CONCRETE NOT SHOWN 2. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH ALL APPLICABLE FEDERAL, / / / // 1 f I I I I I� Cl) M M \ \ \ \ a) o 4"NRS GATE VALVE STATE(e.g.MINIMUM DESIGN CRITERIA),AND LOCAL STANDARDS AND MANHOLE STEPS FLANGED,CAST IRON BODY SPECIFICATIONS,HEREBY INCORPORATED BY REFERENCE. @16'O.C.VERT. WITH STEM EXTENSION CB-914• \ (SEE NCDOT 840.66) AND HANDWHEEL 3. CONTRACTOR SHALL OBTAIN A COPY OF THE SITE GEOTECHNICAL REPORT.THE > REPORT AND ITS RECOMMENDATION SHALL BE PART OF THE STANDARDS AND V) (AVN SPECIFICATIONS FOR CONSTRUCTION OF THE SCM.UPON COMPLETION OF L 3000 PSI REINFORCED CONCRETE COLLAR (u CONSTRUCTION,CERTIFICATION OF THE SCM BY THE GEOTECHNICAL ENGINEER WILL t WITH 2-LAYERS#4 REBAR AROUND PIPE > BE REQUIRED PRIOR TO FINAL SCM ACCEPTANCE. I (SEE DETAIL SHEET C9.06) 6" � U /// /j//// / ^\\\ \ l / I / I I ' / , ( ' \ \�_ \ \ / I •,'e I 1 4"DIP SPOOL 4. THE GEOTECHNICAL ENGINEER SHALL EVALUATE SOILS FOR SUITABILITY OF DAM r 12" 3 H (PE x FLANGED) CONSTRUCTION AND SLOPE STABILITY. 3 L 5. PRIOR TO PLACEMENT OF EMBANKMENT FILL,THE GEOTECHNICAL ENGINEER WILL Ln - 30" _ ® SUPERVISE THE FOUNDATION PREPARATION AND APPROVE THE DEPTH AND EXTENT N 0 // , / / �y\I / / SCM MAINTENANCE \ I 1 I I 60"WEIR OF THE CUTOFF TRENCH. Ln m / \ I &ACCESS EASEMENT I - - o \ \ I \ 42"RUBBER Z o� GASKETED OPEN END 4"PVC 60" 6. THE DAM AND FOREBAY BERMS SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE �o - 7621 \ I \ CLASS III RCP AT NORMAL POOL FOLLOWING SPECIFICATIONS UNLESS SUPERCEDED BY THE GEOTECHNICAL 0 a° \ \ \ 4"SCHEDULE 80 PVC SPOOL ENGINEER'S RECOMMENDATIONS. U rn K r t I I \ ^ Co \ \ \ \ I I I I I \ 4"PVC - (TYPICAL) BORROW MATERIALS FOR USE AS EMBANKMENT FILL SHALL BE FREE OF j +� � � I I p Cl) - \ \ M l l CLEANOUT - ORGANICS,ROOTS AND OTHER WOODY VEGETATION OR ORGANIC DEBRIS. L � Q //�I\� / / / / � � I 365 " \ I ` � 4"PVC TEE 12" 3.0"O ORIFICE � � � / / / / \ ' FILL MATERIALS SHALL CONSIST OF SOILS WHICH CLASSIFY AS SC,SM,CL,CL-CH It O l I �,• \ ` W DRILLED IN 4"CAP AND ML IN ACCORDANCE WITH THE UNIFIED CLASSIFICATION SYSTEM OR AS J./ C a) LL ------------- M I. \ 1 6 APPROVED BY THE GEOTECHNICAL ENGINEER. 0 � / / / / \ \ I AUXILIARY SPILLWAY 380 - - CB-913 ` \ FILL MATERIALS SHALL HAVE A MAXIMUM PARTICLE SIZE OF 3 INCHES IN MEAN / / INVERT ELEV.367.0 I ` \ DIAMETER. (SEE DETAIL SHEET C9.06) u �i iMXl I I i I \ \ S` 12" 60" 6" FILL SHALL BE PLACED IN 8 INCH(MAXIMUM)LOOSE LIFTS UNDER THE 375 I ( I SUPERVISION OF THE GEOTECHNICAL ENGINEER OR THEIR REPRESENTATIVE.FILL \ SHALL BE BROUGHT UP BY BENCHING INTO THE EXISTING SLOPE.A MAXIMUM _ SCM 9 RISER DRAWDOWN DEVICE PLAN HEIGHT OF 2 FEET SHALL BE USED FOR EACH BENCH LIFT TAKING CARE TO 360 �' - \ \ e •' REMOVE ROOT STRUCTURES AS THE FILL PROCEEDS.THE SURFACE OF EACH LIFT $"=1'0" SHALL BE SCARIFIED PRIOR TO PLACEMENT OF THE NEXT LIFT IN ORDER TO &VEGETATED SHELF �= \ U) EFFECTIVELY TIE THE FILL LIFTS TOGETHER. ELEV.HEFT 3 .07 ALL COMPACTION SHALL BE TESTED BY THE SAND CONE METHOD(ASTM D-1556) (SEE SHEET L1.07 FOR / NORMAL POOL ? 1 v RIPRAP DISSIPATOR \ / PLANTING DETAILS) / / /ELEV.362.50 \ \ OR NUCLEAR METHOD(ASTM D-6938)AT A RATE OF AT LEAST ONE TEST PER 5,000 ANN \ TO EXTEND TO STREAM \ \ \ / / / / / �c� SF PER ONE FOOT OF COMPACTED FILL THICKNESS IN GENERAL AREA FILLS AND NCDOT CLASS'1'STONE \ / \ I I I �`o ONE TEST PER 50 LINEAL FEET PER LIFT ALONG THE BARREL. (D50=10") \� 1�% RISER-9 I �XO I I I I �\ a THE MINIMUM COMPACTION SHALL BE A MINIMUM OF 95%OF THE MAXIMUM \ MIN LENTH=28' Cp a 2• / I \ TRASH RACK(TYPICAL) I \ MIN WIDTH=10.5'\ (SEE DETAIL SHEET C9.06) HANDWHEEL TO STANDARD PROCTOR DENSITY(ASTM D 698)AT MOISTURE CONTENTS VARYING \ MIN DEPTH=2.13' \ bq.1� l / I \ �, 12" FROM 2 PERCENT BELOW TO 3 PERCENT ABOVE OPTIMUM MOISTURE CONTENT V \, / 10 M I I P 1 EXTEND 12"MIN J I \\ \ / \ 15 NpP CB 908 (MIN) ABOVE TRASH RACK DETERMINED BY STANDARD PROCTOR TEST TO WITHIN 3 FEET OF THE FINAL J MANHOLE STEPS @16"O.C.VERT. \� GRADE. I \ HW-9 / / / /' / MAIN POOL / CB-907 - "e` (SEE NCDOT 840.66) I 7. SUBGRADE FOR THE RISER STRUCTURE AND OUTLET PIPE SHALL BE APPROVED BY THE F_ "4 FILTER DIAPHRAGM / / INVERT ELEV.358.0 \ {• t RISER CREST ELEV.365.75 W \ / ` RIPRAP DISSIPATOR I GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT.IF THE GEOTECHNICAL ENGINEER / (SEE DETAIL SHEET C9.06) PLACE STEM SUPPORTS PER Z j Ln � NCDOT CLASS'1'STONE REQUIRES ADDITIONAL SUBGRADE PREPARATION,THE ADDITIONAL COST SHALL BE u� 70 1 MANUFACTURER'S RECOMMENDATION W �o (D50=10") APPROVED BY THE ENGINEER PRIOR TO PLACEMENT. I �N ,1 60"WEIR CREST ELEV.364.50 Q \ w o \ MIN LENTH=12' U 0} o I \ \ ` I \\I I I w I s I\ \ \ \ \ \ \\ o s MIN WIDTH(W1:W2)=9':15' \ \ \ 8. THE OUTLET PIPE SHALL BE BEDDED IN CONCRETE FOR 2/3 OF THE PIPE LENGTH, z M e" / / n ° DRAWDOWN PIPE UPTURNED 12" BEGINNING AT THE RISER,AND IN#78 STONE FOR 1/3 OF PIPE LENGTH TO THE Y 2 I \ EXISTING \ \ �\ o \ M \ \ MIN DEPTH=2' TO ESTABLISH NORMAL POOL OUTLET.SEE DETAILS ON SHEET C9.06. WETLANDS I� ( \ w r FOREBAY FILTER BERM \ M \ E �u \ o r FOREBAY \ \ \ OPEN END 4"PVC (SECURED TO RISER WALL) J OLL (SEE DETAIL SHEET C9.06) INVERT ELEV.358.0 Za 9. EMBANKMENT AND SIDE SLOPES OF THE BASIN SHALL BE STABILIZED PER SEEDING Lu x l I \ I \ \ \ \ I \ \\ , NORMAL POOL ELEV.362.50 SCHEDULE ON EROSION CONTROL DETAILS SHEET C10.06 OR SODDED.SEE n LANDSCAPE PLAN ON SHEET L1.07 FOR FURTHER PLANTING DETAILS. o ° 12, 3.00"PJ ORIFICE Z 10 W DRILLED IN 4"CAP 10. IF,DURING CONSTRUCTION,THE SCM IS TO BE USED AS AN EROSION CONTROLLLI W I \ ✓ / ` \ \\ \ \ \ \ \ / /� /��`�/� /��`�/� n / / MEASURE,THE FOREBAY BERM(S)SHALL NOT BE INSTALLED DURING THE INITIAL / / / / / / ; ° CONSTRUCTION OR WHILE THE SCM IS USED AS AN EROSION CONTROL MEASURE. \ / 4"NRS GATE VALVE 4"PVC CLEANOUT 'FLANGED,CAST IRON BODY 4"DIP BOTTOM DRAIN 11. THE FOREBAY BERM(S)SHALL BE CONSTRUCTED WITH THE SAME REQUIREMENTS, I / � l ( ` \� \ \ \ \ \ \ \\ \ \ 360 - - - - �� ': � / n \�/'`'�•\�• ��/'`'�•\�• � / (TEMPORARY SKIMMER AND USING THE SAME METHODS AS THE DAM(SEE NOTE 6). 12" ATTACHMENT FOR 12. UNLESS OTHERWISE NOTED,ALL PERMANENT STRUCTURES(e.g.RISER/BARREL,WEIR EROSION CONTROL) °° - 'So Q CB 90� / / \' " \' " \' " ' WALLS,ETC.)ARE TO BE INSTALLED WITH THE INITIAL DAM CONSTRUCTION. 365 ' - _ - - -_- - - \�000 g6 NPee / /\' \ /\' \ /\'l n 13. FOR SITE BUILT FEATURES(e.g.WEIR WALLS,DROP STRUCTURES,BRIDGES,ETC.),THE H OF pPM- - - - - - 6° �'i / �� \�, �\��j'��\�, �\��j'��\� �\�/ 'gj s /\ \ \ /\ \ \ /\ \ \ /\ \ \ /\ CONTRACTOR SHALL PROVIDE STRUCTURAL DRAWINGS TO THE DESIGN ENGINEER Z C\ C\ C\ C\ C\ / FOR REVIEW AND APPROVAL PRIOR TO CONSTRUCTION.STRUCTURAL DRAWINGS 36g� - - - - - - - _ _ �\ -al 30WITH I2RLAYERS#4 REBAR AROUND PIPE \ �12` `>/� 'y/�\> �\>/� 'y�\> �\>/� 'y�\> �\>/� 'y�\> �\>/� 'y�\ \> \ SHALL BE SIGNED AND SEALED BY A PROFESSIONAL ENGINEER. Z) _ �665 - - - - - - - _3 - �'j- A (SEE DETAIL SHEET C9.06) ` ° \ \ \ \ \ \ 14. PRIOR TO FINAL GRADING OF THE SCM,THE CONTRACTOR SHALL PROVIDE U D S 3 / \ Co ON TO CONFIRM THAT THE FINISHED SCM SUFFICIENT AS BUILT SURVEY INFORMATION WILL MEET THE SPECIFIC DIMENSIONAL REQUIREMENTS APPLICABLE TO THE SCM. W 84 `�/� �/�`��`�/� �/�`��`�/� �/�`��`�/� �/�`��`�/� �/�` \ THOSE REQUIREMENTS INCLUDE: Q Z -I- i /. ./.i /. LL C - \/ / / / / / / / / / i POND BOTTOM ELEVATION= 358.00 FT �3bG - - _ _ _ SUPPORT PEDESTAL" \ \ \ u Q - � \ - - FOR GATE VALVE \ ' ` ' ` ' _ S �„ / / / DRAWDOWN OVERFLOW ELEVATION(NORMAL POOL)= 362.50 FT Z - \ 42"RUBBER j j ° s ° \ \ \ \ \/ MINIMUM SURFACE AREA AT NORMAL POOL ELEVATION= 18,819 SF Q 35`'� - ` ` j, \ - GASKETED 5'WEIR CREST ELEVATION= 364.50 FT CLASS III RCP s \ \ \ \ Z Ln J 5'X 5'RISER CREST ELEVATION= 365.75 FT O Z W W � 41� s LOW POINT TOP OF EMBANKMENT(AUXILIARY SPILLWAY)= 367.00 FT � ^/ t^ u � � _ � - - - � � / �� _ � � / / 2B ti \ \ ----- ----+-+VERT OUT-352.00 \\/ `\\/ U L.f� U) AVERAGE TOP OF EMBANKMENT(+/-0.1 FT)= 368.00 FT I I s _ / \ W •' ° .i}G,f20UT.;.;!. .!.....;!. .!. .!... 15. ELEVATIONS SHALL BE WITHIN 0.1 FEET OF THE ABOVE ELEVATIONS FOR EARTHWORK, f,\ tI� .,a ° " \ g2 \ \ AND 0.05 FEET FOR OUTLET STRUCTURE.ALL SURFACE AREAS ARE THE MINIMUM Z Q \ I - I AREAS.REQUEST FOR A REDUCTIONS IN THE MINIMUM VALUES WILL BE CONSIDERED Q a Z \ \ \ ON A CASE BY CASE BASIS. - \ CONCRETE PIPE CRADLE (SEE DETAIL SHEET C9.06) 0 16. ONCE THE PROJECT SITE HAS BEEN STABILIZED,CONTRACTOR SHALL OBTAIN - - ANCHOR W/DOWELS APPROVAL BY EROSION CONTROL INSPECTOR IN ORDER TO REMOVE TEMPORARY N 34S \ \ �' / /� / I / / / / \ \ / / \ / /% BALLAST CONCRETE \ \ #4 REBAR X 12"@ 2'O.C. EROSION CONTROL DEVICES. Z PIPE INSTALLATION MUST PROVIDE �\ (SEE DETAIL SHEET C9.06) z \ \ .\\.\/\.�\ ..\.. , 3.75 CUBIC YARDS \/ ,/• A PIPE JOINT AND CONSTRUCTION JOINT REQUIRED • ONCE ALL SEDIMENT AND EROSION CONTROL DEVICES HAVE BEEN REMOVED, J SCM 9 WET POND PLAN VIEW WITHIN 4'OF RISER WALL AT RISER NOTE: COMPACTED STONE OR PREPARED SUBGRADE THE SCM SHALL BE CONVERTED TO A PERMANENT SCM. 0 RISER AND BALLAST CONCRETE HAVE BEEN SIZED BASED ON BUOYANCY AS RECOMMENDED BY GEOTECHNICAL ENGINEER ALL SEDIMENT SHALL BE REMOVED AND DISPOSED OF PROPERLY. CALCULATIONS.ADJUSTMENTS TO CONCRETE DIMENSIONS ARE NOT • FOREBAY AND VEGETATED SHELF SHALL BE CONSTRUCTED AS SHOWN ON THE 380 0 380 PERMITTED WITHOUT PRIOR WRITTEN APPROVAL.ANY DIMENSIONAL PLAN. CHANGES TO BALLAST CONCRETE BASE AND RISER MUST BE REQUESTED -t � 11� a �� IN WRITING AND MUST BE ACCOMPANIED BY BUOYANCY • VEGETATED SHELF SHALL BE PLANTED PER PLANT SCHEDULE ON LANDSCAPE N m= CALCULATIONS SIGNED AND SEALED BY A NORTH CAROLINA PLAN(SEE SHEET L1.07). Docusigned by: �m �� REGISTERED PROFESSIONAL ENGINEER. r,o �> 17. FINAL CERTIFICATION OF THE SCM BY A PROFESSIONAL ENGINEER LICENSED IN THE o c^oM =? oMF STATE IN WHICH THE PROJECT IS LOCATED IS REQUIRED. gEgg��°°gRA 9P.t+K 0°OOoo �Mj oza SCM 9 RISER DRAWDOWN DEVICE DETAIL CLAY LINER SPECIFICATIONS: °o °°°FEss%°°�'� 375 6,� wc~i,o mom» 375 Q- 9 0 =z ��z THE CONTRACTOR SHALL INSTALL A CLAY LINER TO MAINTAIN A PERMANENT POOL AT THE o SEAL o DESIGN ELEVATION.IF THE SITE GEOTECHNICAL ENGINEER DETERMINES THAT THE 0 0 EXISTING SITE CONDITIONS(SOIL PROPERTIES,EXISTING WATER TABLE,ETC.)INDICATE 049066 z THAT NORMAL POOL CAN BE MAINTAINED WITHOUT A CLAY LINER,THE GEOTECHNICAL jL x ENGINEER WILL PROVIDE NOTICE IN WRITING TO THE PROJECT ENGINEER THAT THE CLAY °'P ° °G)N ° ° o SOUTHEAST NORTHEAST SOUTHWEST NORTHWEST °° S/ ° ° ° °N,, LINER IS 370 370 A CREDIT FOOR THREQUIRED. ETION OF THE LINER INERIS NOT INSTALLED,THE OWNER SHALL RECEIVE °O°°NQ0 Na J pOOD,, 10'MIN 7/2/2024 EXISTING GROUND AT A MINIMUM,THE CLAY LINER MATERIAL FOR THE WET POND SHALL MEET THE TOP OF DAM FOLLOWING SPECIFICATIONS: N N 100-YR WSEL:366.9 �� DESIGNATION OF C , R SC RISER CREST:365.75 UNIFIED SOIL CLASSIFICATION SYSTEM D L CH ML O a is so 10 YR WSEL:366.1 °/p &MIN ---- - ------ -------- --- - - - - - --- 44.36 LF 36"HPPP 15 • MINIMUM OF 40 ° A G#200 SIEVE SSIN �' � E 365 VEGETATED SHELF M M @0.79% 6"MIN OPEN 15 • MINIMUM PLASTICITY INDEX OF SCALE:l inch=30ft. EL.363.0 362.0 - x _ _ _ _1_Y_R_W_S_E_L:_3_64.6 MANHOLE 60"WEIR CREST:364.50 S 45.86 LF 36"HPPP STEPS 60, MAXIMUM PERMEABILITY OF 1 X 10_s cm/sec INITIAL PLAN DATE:09/20/2023 3 @ 0.76% 60"(TYPICAL) • A MINIMUM OF 2 TESTS OF EACH ABOVE PARAMETER SHALL BE PROVIDED FROM REVISIONS: FILTER DIAPHRAGM 6 OPEN AT 24"NORMAL POOL WSEL:362.50 AN APPROVED LABORATORY ON THE LINER MATERIAL AND PRESENTED TO THE SEE DETAIL SHEET C9.06 1 05/15/2024 ( ) NORMAL POOL ENGINEER FOR APPROVAL PRIOR TO PLACEMENT OF THE MATERIAL. REVISED PLANS PER REVIEW COMMENTS TOP EL.:362.5 ELEV. NORMAL POOL:362.50 o STA:1+28.2 Q n I I COMPACTION TO A MINIMUM OF 95%OF THE MAXIMUM STANDARD PROCTOR a 360 3 3_ 360 i-� 12" DENSITY(ASTM D-698),AND WITHIN 3%OF THE OPTIMUM MOISTURE CONTENT z 3.00"0 IN 4"PVC CAP:361.50 a X `� f N (MINIMUM OF 1 COMPACTION DENSITY TEST PER 2500 SQUARE FEET). a ... ................. ............. .... . ±74.3" 12"SEDIMENT STORAGE n N PROPOSED GRADE AN IN PLACE MAXIMUM INFILTRATION RATE OF 0.01 INCHES PER HOUR. o FOREBAY 12"MIN • RECOMMENDATIONS OF THE SITE GEOTECHNICAL ENGINEER MAY SUPERCEDE MAIN POOL 30" THE ABOVE SPECIFICATIONS. 0 12"MIN n 355 355 4"DIP DRAIN THE CLAY LINER SHALL BE PLACED UNDER THE BOTTOM OF THE SCM PERMANENT POOL CONCRETE COLLAR 4"BOTTOM DRAIN INVERT:359.00 TO A MINIMUM THICKNESS OF 8 INCHES.A MINIMUM OF 4 INCHES OF TOPSOIL SHALL BE 165' PLACED ABOVE THE CLAY LINER TO THE FINISHED GRADE AS SHOWN ON THE DRAWINGS (SEE DETAIL SHEET C9.06) n AND/OR DETAILS.CARE SHALL BE TAKEN WHEN PLACING THE TOPSOIL SO AS NOT TO 42'RCP @ 69 DAMAGE THE CLAY LINER.ACLAY/SOIL,NO ORGANICS,MIXTURE MAYBE USED IF THE ABOVE SPECIFICATIONS ARE SATISFIED AND WITH WRITTEN APPROVAL BY THE u a n GEOTECHNICAL ENGINEER. 350 350 PRECAST CONCRETE MATERIALS NOTES: m RIPRAP DISSIPATOR ___ 1. ALL PRECAST CONCRETE STRUCTURES SHALL CONFORM TO ASTM C913 o (SEE PLAN VIEW FOR CONCRETE CRADLE a SIZING REQUIREMENTS) n 84" 84 (RECTANGULAR)OR C478(ROUND). (SEE DETAIL SHEET C9.06) 2. ALL REINFORCED CONCRETE PIPE SHALL CONFORM TO ASTM C76,CLASS III(UNLESS OTHERWISE NOTED), 345 #57 STONE BEDDING 345 42"RUBBER n 2.1. O-RING JOINTS(RGRCP)SHALL CONFORM TO ASTM C443&ASTM C361. _ (SEE DETAIL SHEET C9.06) GASKETED 2.2. NON O RING JOINTS(RCP)SHALL CONFORM TO ASTM C990 CLASS III RCP WR JOB NUMBER 02190647 E ° ADDITIONAL REQUIREMENTS: DRN:WR DGN:WR CKD:WR 42"RGRCP INVERT:352.00 1. SCMS MUST BE LOCATED WITHIN COMMON OPEN SPACE,AND WITHIN AN ACCESS , ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, AND MAINTENANCE EASEMENT. ................. ;;, .............,, SCM 9 PLAN AND , G120U.....; «,; «, «,; r,r GROUT'..... 340 340 .............................. ,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,, ,r, „,n„,n,,n„,n,,,,.............,,,,,,,,,, """ """"' ' """"' """"' """"' """"' """"""''' """"' """"' """"' """"""' """"' """ """"' 2. N OPERATIONS AND MAINTENANCE MANUAL AND MAINTENANCE AGREEMENT """"' A DETAILS 0 6"MIN SHALL BE PREPARED AND PROVIDED TO THE OWNER.ADDITIONAL REQUIREMENTS a O+DO 0+50 1+ 0 1+50 2+ 0 2+50 3+ 0 3+50 4+00 4+50 ot (e.g.RECORDATION OF EASEMENTS,AGREEMENTS,ETC.)MAY APPLY. a SCM 9 WET POND PROFILE VIEW SCM 9 RISER INSIDE WALL ELEVATIONS C9,03 Y SCALE H:V Yll A