SW6230401_Plansheet - C4.1 SCM Detail_20230716

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INSPECTION AND MAINTENANCE PROVISIONS PROPOSED �; .••ESS�•. % ;
GRADE �� �.pyl 1 - ?QUO O��% -
�' + I 379-
_
BMPELEMENT POTENTIAL PROBLEM HOW TO REMEDIATE THE PROBLEM RETAINING w
THE ENTIRE BMP TRASH/DEBRIS 15 PRESENT. REMOVE THE TRASH/DEBRIS. WALL p ( _ J _ : E
THE PERIMETER OF AREAS OF BARE SOIL AND/OR REGRADE THE SOIL IF NECESSARYTO 380 - 380 f - r �1 = 35 .
THE WET DETENTION EROSIVE GULLIES HAVE FORMED. REMOVE THE GULLY,AND THEN PLANT A / �'' • ;
BASIN GROUND COVER AND WATER UNTILITIS
ESTABLISHED. PROVIDE LIM E AND A ON E- k - ��• N �•:P�O\,
TIME FERTILIZER APPLICATION. ---- ------: -------- --- -
Z ---- t----'--T-----'-' '...- •• Cr••
378 378 - _ .NG I E•.
VEGETATION IS TOO SHORT OR MAINTAIN VEGETATION ATA HEIGHT OF ,T -, ,?^I__ i, __i - OO ••••••.\���
TOO LONG. APPROXIMATELY SIX INCHES.
THE INLET DEVICE: THE PIPE IS CLOGGED. UNCLOG THE PIPE. DISPOSE OFTHEl ^� ' ®- --- •-----r-- -•-- ri --- T '-_ _ --- --'-- "-
PIPE OR SWALE SEDIMENT OFFSITE. 376 376
THE PIPE IS CRACKED OR REPLACE THE PIPE.
OTHERWISE DAMAGED. �- �_� -
a'r7. _ ' ' CONTROL STRUCTURE O
EROSION IS OCCURRING IN THE REGRADE THE SWALE IF NECESSARY TO 374 374 �r f RIM=371.50 M
SWALE. SMOOTH IT OVER AND PROVIDE EROSION �- 37O " E
. ?OA=372.^0'- 100YR STAGE r 4 DRAWDOWN, M O
CONTROL DEVICES SUCH AS REINFORCED y��� 50 YR STAGE 1 "� � � 69��� �
TURF MATTING OR RIPRAP TOAVOID I %Y 368 0+25 INV.=370.50'
25 YR STAGE 6
FUTURE PROBLEMS WITH EROSION. 372 372 _� / .39 OtOO 367 0+42.4 I U
T000+75 00 1+2 SEE DRAWDOWN DETAIL t11
THE FOREBAY SEDIMENT HAS ACCUMULATED TO SEARCH FOR THE SOURCE OF THE 10 YR STAGE / �^ I 10 THIS SHEET V M W
A DEPTH GRATER THAN THE SEDIMENT AND REMEDYTHE PROBLEM IF
WEIR=370.50' _
ORIGINAL DESIGN DEPTH FOR POSSIBLE. REMOVE THE SEDIMENT AND ELEV=371.50' �� � / 0+50- 1+34.27
SEDIMENT STORAGE. DISPOSE OF IT IN A LOCATION WHERE IT 37O 37O ,�r / •y$ .g9`? 367 366 l Z M L
WILL NOT CAUSE IMPACTS TO STREAMS OR 1 1 1 ELEV=370.50' /- ;•� ��� 368 369
THE BMP. �� 372 37Q- 1l V 369.06' 0 V Cn .C_ M
EROSION HAS OCCURRED. PROVIDE ADDITIONAL EROSION PROTECTION -r J p.
SUCH AS REINFORCED TURF MATTING OR 368 368 f v
RIPRAP IF NEEDED TOPREVENTFUTURE _ / � 371.5- ,� �� a� Z fV W pQ
EROSION PROBLEMS. J v r _ 3"SCH.80 PVC OUTLET C I = O
WEEDS ARE PRESENT. REMOVE THE WEEDS,PREFERABLY BY ® 374 INV OUT=369.25' C N I� a
HAND. IF PESTICIDE IS USED,WIPE IT ON 366 366 _r � 375- W i �. N Ln
THE PLANTS RATHER THAN SPRAYING.
Q 372.50 N 52.4 30"W 1 9.59'=
THE VEGETATED BEST PROFESSIONAL PRACTICES PRUNE ACCORDING TO BEST PROFESSIONAL RIM 1 ,�Q CC
faSHELF SHOW THAT PRUNING I5 NEEDED PRACTICES. EXIT TO FOREBAY EL=367.0' ' - -- FM HE MAINTAIN OPTIMAL PLANT 364 364 y.- .f FM /HEALTH. BOTTOM=363.50' ,_ J 16"C 900 PVC SIN (No nCO) 'on)PLANTS ARE DEAD,DISEADED OR DETERMINE THE SOURCE OF THE -- 0)BOTTOM ENTRANCE=366.00' - � / V Q)
DYING. PROBLEM:SOILS,HYDROLOGY,DISEASE, tz
ETC. REMEDYTHE PROBLEM AND REPLACE 362 -362
6"CLA YSLSILL'INER l - � v V
_ J
PLANTS. PROVIDER ONE-TIME FERTILIZER -WAIN POOL ---- � .� � �
APPLICATION TO ESTABLISH THE GROUND
COVER IF A SOIL TEST INDICATES IT Is �L
NECESSARY. 360 360 - _ 372 -� �� •�j X V
WEEDS ARE PRESENT. REMOVE THE WEEDS,PREFERABLY BY _-' p = = Z
HAND. IF PESTICIDE I5USED,WIPE IT ON �- -
THE PLANTS RATHER THAN SPRAYING. O+OO O+SO 1tOO 1+SO L 37 ��; ~` `,'...••,:::.. -�� ,, }J CO J_
THE MAIN TREATMENT SEDIMENT HAS ACCUMULATED TO SEARCH FOR THE SOURCE OF THE -~ 6 �_
AREA A DEPTH GREATER THAT THE SEDIMENT AND REMEDY THE PROBLEM IF •: ; : :`;, ,..', ,":, ':.' '..'i::�., "'. .`. :.:,'.:;;;..•, :.'."' - O _
ORIGINAL DESIGN SEDIMENT POSSIBLE. REMOVE THE SEDIMENT AND
STORAGE DEPTH. DISPOSE OF IT IN A LOCATION WHERE IT
T RMWi4TER MAMA EMENT DE N WET POND
WILL NOT CAUSE IMPACTS T REAMS R
S O G SIG
0 U 0 5T 0
THE BMP. -
ALGAL GR GROWTH COVERS OVER CONSULT A PROFESSIONAL REM VE 0 0 0TO 0
DE T R STORM
SI N M M STAGE
G SO SO S G
50%OF THE AREA. AND CONTROL THE ALGAL GRDWTH. � � .�f
CATTAILS,PHRAGMITES OR OTHER REMOVE THE PLANTS BY WIPING THEM - I M
INVASIVE PLANTS COVER 50%OF WITH PESTICIDE(DO NOTSPRAY). 10-YEAR 371.75 FT-MSL 0 50 100 JS''
THE BASIN SURFACE. 25-YEAR 371.81 FT-MSL 1 N
THE EMBANKMENT SHRUBS HAVE STARTED TO GROW REMOVE SHRUBS IMMEDIATELY. SO-YEAR 371.84 FT-MSL HORZ. I
ON THE EMBANKMENT. 100-YEAR 371.87FT-MSL SCALE FEET
EVIDENCE OF MUSKRAT OR USE TRAPS TO REMOVE MUSKRATS AND
60
BEAVER ACTIVITY ISPRESENT. BEAVERS.APROFESSIONALTOREMOVE HORZ. WET POND PLAN VIEWA TREE HAS SlARTED yid
ON THE EMBANKMENT 0 GROW REMOVE THE TREEFETY SPECIALIST TO SCALE FEET SCALE:1"=30' �w
CONSULT A DAM WET POND PROFILE VIEW
AN ANNUAL INSPECTION BY AN MAKE ALL NEEDED REPAIRS.
APPROPRIATE PROFESSIONAL SCALE:1"=50' POND ELEVATIONS:
SHOWS THAT THE EMBANKMENT
NEEDS REPAIR. MAIN POOL:
THE OUTLET DEVICE CLOGGING HAS OCCURRED. CLEAN OUT THE OUTLET DEVICE. DISPOSE
OF THE SEDIMENT OFRSITE. POND BOTTOM:363.50' CONSTRUCTION SEQUENCE FOR WET DETENTION POND: NOTE:
THE OUTLET DEVICE 15 DAMAGED. REPAIR OR REPLACE THE OUTLET DEVICE. TOP OF SEDIMENT STORAGE:364.50'
THE RECEIVING WATER EROSION OR OTHER SIGNS OF CONTACTTHE NC DIVISION OF WATER 1. INSTALL EROSION CONTROLS STORMWATER BASIN ARE TO BE CONSTRUCTED FOR USE
DAMAGE HAVE OCCURRED ATTHE QUALITY WASHINGTONREGIONALOFFICE,OR FOREBAY: 2. CONSTRUCT DAM BASE AND AREAS BELOW THE NORMAL POOL. CONSTRUCTION TO BE AS A TEMPORARY SEDIMENT BASIN DURING CONSTRUCTION.
OUTLET. THE401 OVERSIGHTUNIT,,919-733-1786. POND BOTTOM:367.00' ONCE CONSTRUCTION IS COMPLETED THE TEMPORARY
PERFORMED UNDER THE INSPECTION OF THE GEOTECHNICAL ENGINEER. SEED UPON
FOREBAY SHALL BE 366.00'@ FOREBAY ENTRANCE COMPLETION SEDIMENT BASIN IS TO BE CLEANED UP AND SHAPED
AND 367.00'AT WEIR(FOREBAY ENTRANCE SHALL 3. INSTALL OUTLET PIPE, RIPRAP APRON AND STONE FILTER RING. PRIOR TO BE USED AS A INFILTRATION BASIN.
BE 1'DEEPER THAN FOREBAY EXIT AS SHOWN ON 4. CONSTRUCT OUTLET STRUCTURE,INSTALL TEMPORARY SKIMMER. '
THIS PLAN) 5. UPON COMPLETION AND STABILIZATION OF UPSTREAM DEVELOPMENT,REMOVE \
TOP OF SEDIMENT STORAGE:367.50' SKIMMER,INSTALL PERMANENT ORIFICE DRAWDOWN DEVICE AND SEED UPON
COMPLETION.
t4BMP MAINTENANCE:
STORM WATER MANAGEMENT NOTES:
Important operation and maintenance procedures:
1. THE DEVELOPER OR HIS AGENT SHALL CONTACT THE DESIGN ENGINEER WHEN
THE BEST MANAGEMENT PRACTICES ARE CONSTRUCTED AND ABOUTTO BECOME 1. Immediately after the wet pond is established,the plants on the
OPERATIONAL SO THAT A FINAL INSPECTION CAN BE PERFORMED TO DETERMINE vegetated shelf and perimeter of the basin will be watered twice
COMPLIANCE WITH THE APPROVED PLAN. weekly if needed, until the plants become established
2. ANNUAL MAINTENANCE INSPECTION AND REPORT REQUIRED. THE OWNER OF A (commonly six weeks).
PERMITTED STRUCTURAL STORM WATER BMP SHALL ANNUALLY SUBMIT A 2. No portion of the wet pond will be fertilized after the first initial
MAINTENANCE AND INSPECTION REPORT FOR EACH BMP TO THE STORM WATER fertilization that is required to establish the plants on the
ADMINISTRATOR. ANNUAL INSPECTIONS SHALL BEGIN WITHIN ONE YEAR OF THE vegetated shelf.
RECORDATION OF ANY DEED(S)SHOWING STORM WAFER BMPS. 3. Stable ground cover will be maintained in the drainage area to �' - TRASH RACK BY PLASTIC
3. UPON COMPLETION OF THE PROJECT,THE ENGINEER OF RECORD SHALL CERTIFY reduce the sediment load to the wet pond. SOLUTIONS INC.OR
THAT THE COMPLETED PROJECT IS IN ACCORDANCE WITH THE APPROVED STORM 4. If the pond must be drained for an emergency or to perform EQUIVALENT
WATER MANAGEMENT PLANS AND DESIGNS. maintenance,the flushing of sediment through the emergency
4. A FINAL INSPECTION OF THE SITE AND STORM WATER BMP SHALL BE SCHEDULED drain will be minimized as much as possible.
WITH AND COMPLETED BY THE PROJECT ENGINEER. 5. Once a year,a dam safety expert should inspect the TOP OF RIM=371.50'
5. NCDEQ AND THEIR ASSIGNS HAVE RIGHT TO ACCESS THE STORM WATER embankment. 2'X 2' CONC. TRASH RACK --
CONTROLS FOR INSPECTIONS OR MAINTENANCE AS NECESSARY. 6. The measuring device used to determine the sediment elevation 2'-2"X 3.0'
6. THE PROPERTY OWNER IS RESPONSIBLE FOR MAINTAINING THE STORM WATER shall be such that It will give an accurate de h reading and not ANTI-SEEPAGE SEE MANUFACTURERS
CONTROLS ACCORDING TO THE APPROVED MAINTENANCE PLAN AND DIRECTION COLLAR _ PRECAST BOX SPECIFICATIONS FOR
readily penetrate into accumulated sediments. SEE DETAIL DETAILS
OF NCDEQ.
After the wet pond is established,it should be inspected quarterly and :- 4"PVC PIPE FOR DRAW
within 24 hours after every storm event greater than 2.0 inches(or 2.5 3 SCH 80 PC DOWN ORIFICE
11 INVERT inches if in a Coastal County).. Records of operation and maintenance INV=370.50',SEE DRAW
will be kept in a known set location and shall be available upon 369.25' DOWN ORIFICE DETAIL
request. NOTE:
Inspection activities shall be performed as follows. Any problems that WET POND
are found shall be repaired immediately. 3" PVC r
INV OUT= � a ,' _• • 1. CONTRACTOR TO PROVIDE A PEAKED ROOF STRUCTURE TRASH
369.00' 3'MIN. 1 RACK BY PLASTIC SOLUTIONS INC.(877 87775727)OR
EQUIVALENT.6"x 6" MAXIMUM GRATE OPENING
I_ 4'MIN 1
f KEY 2. PROVIDE STEPS IN ALL DRAINAGE STRUCTURES DEEPER THAN 54".
... . .:. . . . . :::::....
CUTOFF TRENCH "" LOCATE STEPS WITHIN REASONABLE PROXIMITY TO ACCESS POINT
APPROXIMATE SIZE ELEV.=368.25' (MANHOLE OR GRATE OPENING)WITHOUT INTERFERING WITH
EXCAVATE AND BACKFILL WITH 3'X 4'CONC.BASE REINFORCED WITH PIPE ORIENTATIONS.
COMPACTED FILL AS DIRECTED #4 BARS AT 12"O.C.TOP AND BOTTOM OF
BY GEOTECHNICAL ENGINEER EACH DIRECTION.PROVIDE 3"MIN
CLEARANCE BETWEEN EDGE OF CONCRETE
AND STEEL REINFORCING.
1
CUTOFF TRENCH - OUTFALL DETAIL Z
SCALE: N.T.S. Uj
2
W
SHALLOW LAND ZONE 2'
HERBACEOUS PLANTS 12
BMP LANDSCAPE NOTES: \ a
1' OUTLET RISER
1. THE BMP LANDSCAPING SHALL BE IN COMPLIANCE WITH THE NCDEQ BMP ° #4 REBAR IN FRONT &REAR FACE FLOW PUMP z
REQUIREMENTS. ° OF COLLAR.REBAR TO 4"PVC PLUG
2. LANDSCAPE CONTRACTOR SHALL PROVIDE A TWO-YEAR WARRANTY PERIOD. ALL HAVE 3"MIN.CONC.COVER SCREW TYPE
PLANTS THAT DO NOT SURVIVE MUST BE REPLACED. FROM EDGE OF FACE OF COLLAR \ ;J'\� Q
` 3. AT THE END OF THE FIRST YEAR AND AT THE END OF THE TWO-YEAR WARRANTY �7TEMPORARY POOL EL 371.75' Z
\ J PERIOD,ALL PLANTS THAT DO NOT SURVIVE MUST BE REPLACED. ° \ J
\ X 1 '' ` I POND NORMAL POOL 4. ESTABLISHMENT PROCEDURES SUCH AS CONTROL OF INVASIVE WEEDS,ANIMAL
T AND VANDAL DAMAGE,MULCHING,AND WATERING SHALL BE IMPLEMENTED TO U) NO
K THE EXTEND NEEDED TO ENSURE PLANT SURVIVAL. TEMPORARY LL
�C ` 5. SOD WITHIN BMP AND SURROUNDING AREAS TO BE CENTIPEDE GRASS. ° 4 T4EE VC POOL \ - WATER LEVEL Q
/ \ / \ 6. GRASS OR WILDFLOWER SEED MUST BE APPLIEDAT THE RATES SPECIFIED BY THE
VEGETATIVE SHELF PLANTINGS: SUPPLIERS. IF PLANT ESTABLISHMENT CANNOT BE ACHIEVED WITH SEEDING BY a ° \ Uj O
THE TIME OF SUBSTANTIAL COMPLETION OF THE STORM WATER FACILITY PORTION q NOTES:
AREA OF VEGETATIVE SHELF:1,185 SF OF THE PROJECT,THEN THE CONTRACTOR SHALL PLANT THE AREA WITH 1) ALL CONCRETE TO BE 3000 PSI NORMAL POOL EL.370.50' NOTES:
WILDFLOWER SOD,PLUGS,CONTAINER PLANTS,OR OTHER MEANS TO COMPLETE NON-FLY ASH r , N
MIN. PLANTS REQUIRED:50 PLANTS PER 200 SF OF VEGETATIVE SHELF=296 PLANTS 2' „ 4"PVC PIPE iv 1) PRIOR TO INSTALLATION, MANUFACTURER SPECIFICATIONS THE SPECIFIED PLANTING AND PROJECT AGAINST EROSION BEFORE WATER IS 4 2) APPLY 1/2 THICK WRAP OF STUBBED INTO � /
ALLOWED TO ENTER THE STORM WATER BMP FACILITY. PERMANENT OF FILFER MEDIA SHALL BE REVIEWED TO ENSURE THAT� ASPHALTIC CEMENT AROUND OUTLET RISER �� O
PLANT TYPE: 7. ALL MATERIALS SHALL BE ACQUIRED FROM AN APPROVED NCDEQ PLANT VENDOR. 4 POOL DISCHARGE FROM FILTER MEDIA SHALL MEET OR EXCEED
PLANT MATERIAL SHOULD BE PURCHASED FROM A LOCAL SOURCE TO ENSURE ❑ DISCHARGE PIPE 6 BEYOND PLANNED THE PROVISIONS OF THE CLEAN WATER ACT. / Z
SEEPAGE COLLAR ON BOTH SIDES
SCIENTIFIC NAME: COMMON NAME: QUANTITY: NURSERY CONTAINER: SPACING: PLANTING SEASON: SURVIVABILITY. 2) ENSURE THAT PUMP PRESSURE DOES NOT EXCEED FILTER �� J Z Z 8. IMMEDIATELY AFTER THE WET DETENTION BASIN IS ESTABLISHED,THE PLANTS ON ° 3) APPLY ADDITIONAL ASPHALTIC 3/4"0 DRAW DOWN MEDIA PRESSURE RATING.
THE VEGETATED SHELF AND PERIMETER OF THE BASIN SHOULD BE WATERED TWICE 1 CEMENT AT PIPE/SEEPAGE COLLAR ORIFICE < O
EUPATORIADELPHUS MACULATUS SPOTTED TRUMPETWEED 99 PEAT POT 6'O.C. SPRING/SUMMER �� 3) FILTER MEDIA MAY BE,BUT NOT LIMITED TO,SAND MEDIA � � � ,�'/!'��'
EUPATORIUM PURPUREUM JOE-PYE WEED 99 PEAT POT 6'O.C. SPRING/SUMMER WEEKLY IF NEEDED UNTIL THE PLANTS BECOME ESTABLISHED(COMMONLY SIX a INTERFACE ON UPSTREAM FACES FILTRATION PRACTICES. �� -- 1..� Q J
WEEKS). 4) TO BE FIELD INSPECTED BY
RHYNCHOSPORA COLORATA STARRUSH WHITETOP 99 PEAT POT 6'O.C. SPRING/SUMMER 9. NO PORTION OF THE WET DETENTION POND SHOULD BE FERTILIZED AFTER THE GEOTECHNICAL ENGINEER. ASPHALFIC 4) PUMP STRAINER SHALL NOT BE IN CONTACT WITH BOTTOM O Q C
FIRST INITIAL FERTILIZATION THAT IS REQUIRED TO ESTABLISH THE PLANTS ON THE ° CEMENT TO MEET OR EXCEED _ ____ OF POND. C
VEGETATED SHELF. J ° FEDERAL SPECIFICATION SS-1S3 TYPl: r f LOW POINT W Q
10. BMP PLANT SUBSTITUTIONS ARE NOT PERMITTED.
11. ONLY NON-CLUMPING TURF GRASSES SHALL BE USED. TREES AND WOODY SHRUBS ASTM-D-2822-75 TYPE 1. DRAW DOWN ORIFICE DETAIL � 0
SHALL NOT BE ALLOWED ON THE DAM ORTOP OF SLOPE AREA/10'MAINTENANCE
TYPICAL VEGETATIVE SHELF DETAIL AREA OF THE BMP. CONCRETE ANTI- SEEPAGE COLLAR_ WET POND BASIN DEWATERING
SCALE: N T.S.
SCALE: N.T.S. SCALE: N.T.S. SCALE: N.T.S. DESIGNED BY' JEH
DRAWN BY.'
NO. REVISION DESCRIPTION: DATE: APPROVED BY: JEH
Know what's below
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