SW3240201_Plansheet - SCM Detail_20240603

COMPACTED SOIL (CLAY) LINER MINIMUM MAINTENANCE SCHEDULE EMBANKMENT CONSTRUCTION NOTES 0%1111111up/,/
a SPECIFICATIONS 1. AFTER EVERY SIGNIFICANT RUNOFF PRODUCING GENERAL ��� P ..•••••••.. 1a /,�
RAINFALL EVENT AND AT LEAST MONTHLY: 1. THE POND AND DAM AREA SHALL BE CLEARED,
m s THE BMP POND SHALL INCLUDE A COMPACTED 1.1 INSPECT THE DETENTION BASIN SYSTEM GRUBBED AND STRIPPED OF ALL VEGETATIVE
SOIL LINER. THE EARTHWORK CONTRACTOR SHALL FOR SEDIMENT ACCUMULATION, EROSION, TRASH MATERIAL AND TOPSOIL PRIOR TO DAM =Q a � 0
,-
/ GI 15 \ \ { \'� ''. ' / // / FURNISH ALL LABOR, MATERIAL, SUPERVISION, AND ACCUMULATION, VEGETATED COVER, AND CONSTRUCTION, THE DISPOSAL OF TREES, _ U: 0 w a 1 _ J
I � l 514 / \ 1 \ / GENERAL CONDITION. STUMPS, CONSTRUCTION DEBRIS, VEGETATIVE - _=z = o
\ \ \'_ ` //// EQUIPMENT TO COMPLETE THE COMPACTED SOIL 1.2 CHECK AND CLEAR THE ORIFICE OF ANY MATERIAL, ETC. SHALL NOT BE PERMITTED IN ' Z ~03 z z O
/ - / �\ LINER FOR THE POND INCLUDING THE FOLLOWING
93 LF 36" RCP { / \ // OPERATIONS: HAULING, SIEVING, RAKING, DISCING, OBSTRUCTIONS THAT WOULD INTERFERE WITH THE DAM OR POOL AREA OF THE POND. WHEN '.��d�•, w :'��cP`�.`
COMPACTING, DRYING, WETTING, REMOVAL OF THE DRAW DOWN BLASTING IS USED TO REMOVE ROCK FROM THE 'i,� /V '' ••••• ''��� �` W
/ 0 1.24% v , OF THE TEMPORARY POOL AS DESIGNED. POOL AREA, THE BLASTED AREA SHALL BE '�i, �� ���`
/ / } o / / \ \ \ / \ _ RAINWATER, REMOVAL OF ALL PREVIOUSLY PLACED q�� �� O
/ / I / / I / / �' 2. REPAIR ERODED AREAS IMMEDIATELY. RE-SEED OVER-EXCAVATED TO A DEPTH OF AT LEAST ��n►iinu���
/ ___ I / ;a\ \ \ �� \ - MATERIAL RENDERED UNSUITABLE DUE TO a
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/ / / / I / , / J \ / THE EMBANKMENT AS NECESSARY TO MAINTAIN TWO FEET 2 BELOW FINISH GRADE AND OC
/ / / r - / // 1 \ \ WEATHER CONDITIONS OR CONSTRUCTION ( ) ����iriiiirrr
/ / �= - \ \ \ \ GOOD VEGETATIVE COVER. MOW VEGETATIVE BROUGHT BACK TO FINISH GRADE WITH CLEAN ��
/ \ _ OPERATIONS, FINAL GRADING AND SEALING, AND �� ii
ALL NECESSARY AND INCIDENTAL ITEMS AS COVER ON EMBANKMENT TO MAINTAIN A RELATIVELY IMPERVIOUS SOIL MATERIAL CARP �'� a
MAXIMUM HEIGHT OF SIX INCHES, REMOVE COMPACTED IN PLACE.
DETAILED OR REQUIRED TO COMPLETE THE .• 'gyp qp •, q ,
COMPACTED LINER. TRASH AS NEEDED. `. •gyp F9 . '� `����� ,// W_
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/ / 5g9 / / MFNT F J 515 } _ A- °, \� - 3. INSPECT AND REPAIR THE COLLECTION SYSTEM EARTH FILL DAMS ; *;'�Q" ��';* s ��` P '••Q� >
/ / / \ / 1 / // = \ \ / / SOIL LINER FILL MATERIALS ARE POTENTIALLY (I.E. CATCH BASINS, PIPING, SWALES, RIP RAP, 1. SOIL MATERIALS USED FOR EARTH FILL WHICH
\ \..- ON-SITE. ON-SITE SOILS THAT MEET THE ETC. QUARTERLY TO MAINTAIN PROPER ARE HIGHLY PERMEABLE OR WHICH EXHIBIT - w 1193 cc
/ \/ X_ / / - FOLLOWING REQUIREMENTS SHALL BE CLASSIFIED FUNCTIONING. SIGNIFICANT. CF w= = O
AS SOIL LINER FILL MATERIAL AND MAY BE USED 4. REMOVE WOODY VEGETATION NOT PART OF THE 2. EMBANKMENTS FILL MATERIAL TO BE COMPACTED _ Q:Cn w N z: _ W
IN THE CONSTRUCTION OF THE COMPACTED SOIL APPROVED PLAN ALONG THE DAM EMBANKMENT. TO AT LEAST 95% STANDARD PROCTOR lU '
LINER: 5. REMOVE ACCUMULATED SEDIMENT FROM THE WET COMPACTION. . . o b �•' zrLU
DETENTION BASIN SYSTEM SEMI-ANNUALLY OR 3. SHRINKAGE SWELL, OR DISPERSION SHALL NOT 'i,4z/C '' ••• '' \� � '.�cS �.` (n
\ f \ \ \ \ 1. LIQUID LIMIT, PLASTICITY INDEX, AND PERCENT WHEN THE DEPTH IS REDUCED TO 75% OF THE BE USED IN THE EMBANKMENT. 'i,�� yq'E111A5```��` .,� `�. F_
{ / \ ASIN / fv / /\\ \ _ \ PASSING THE NO. 200 SIEVE WILL BE ORIGINAL DESIGN DEPTH. REMOVED SEDIMENT 4. A CUTOFF TRENCH (CORE TRENCH) SHALL BE
Y \
87 } " / \ / / \\ -_ y._�--• d_�-;_ \ / \ � s CONSIDERED FOR PROPER CLASSIFICATION. THE SHALL BE DISPOSED OF IN AN APPROPRIATE PROVIDED WITH A MINIMUM WIDTH OF FIVE FEET ��ii�(„���� OG
\ 516 \ - . SOIL LINER MATERIAL SHALL HAVE A PLASTICITY MANNER AND SHALL BE HANDLED IN A MANNER 5 THE CENTERLINE OF THE CUTOFF TRENCH W
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I / 65 / \ / / INDEX GREATER THAN 20 OR AS SUBSEQUENTLY THAT WILL NOT ADVERSELY IMPACT WATER SHALL NOT BE LOCATED DOWNSTREAM OF THE
{ ( I COCA FOREBAY \ 1 ' \ \ _ SPECIFIED BASED ON LABORATORY TESTING, AND QUALITY (I.E. STOCKPILING NEAR A WET INSIDE TOP OF SLOPE OF THE DAM. THE
I ) \ ( \ 63 s� \ / / _ - - - \ \ - �_: \ HAVE A SOIL PERMEABILITY OF 1 E-5 CM/SEC DETENTION BASIN OR STREAM, ETC.). CUTOFF TRENCH SHALL BE CAREFULLY w
OR SLOWER AS DETERMINED BY SOIL 6. PERFORM ANNUAL INSPECTION OF THE BASIN BACK-FILLED WITH HIGHLY IMPERMEABLE
PERMEABILITY (ASTM D5084). (ANNUAL INSPECTION REPORTS TO BE KEPT BY MATERIAL AND COMPACTED TO AT LEAST o
2. SOIL LINER FILL MATERIALS SHALL BE THE OWNER). PRIOR TO INSPECTION NOTIFICATION NINETY-FIVE PERCENT (95%) OF STANDARD
REASONABLY FREE OF GYPSUM, FERROUS, MUST BE GIVEN TO STORM WATER SERVICES. PROCTOR DENSITY.
AND/OR CALCAREOUS CONCRETIONS AND 5. THE MINIMUM TOP WIDTH OF THE DAM SHALL BE r
/ '_ •- NODULES OR OTHER DELETERIOUS SUBSTANCES. TEN FEET (10-) AND SLOPES SHALL NOT BE
} \ 1} t ASIN / 5I7 _ - - J / / _ / SOIL LINER MATERIAL SHALL BE RAKED OR NOTE STEEPER THAN 2:1 (TWO HORIZONTAL TO ONE
\ \ 1 \ \ - \ \ \ / / // I SIEVED BY THE EARTHWORK CONTRACTOR, IF THE PRECAST MANUFACTURER IS TO PREPARE AND VERTICAL) ON THE DAM OR EMBANKMENTS
NECESSARY, TO REMOVE ALL AGGREGATE SUBMIT TO THE ENGINEER DESIGN DETAILS AND AROUND THE POND.
/9 GREATER THAN 1 INCH IN DIAMETER. NO MORE CALCULATIONS FOR THE STRUCTURES SHOWN 6. ALL DISTURBED GROUND AREAS AND
\ \ \ 0 � v �s s \\ / � / / \ EXPANDED METAL GRATE
\ / I es / THAN 5 PERCENT OF THE SOIL LINER FILL BASED ON THE DESIGN CRITERIA SPECIFIED. THE EMBANKMENTS SURROUNDING THE POND SHALL TRASH RACK FOR RISER
MATERIAL SHOULD BE RETAINED IN THE N0. 4 DESIGN SHALL BE PERFORMED UNDER THE DIRECT BE MECHANICALLY STABILIZED AND HAVE (SEE DETAILS)
SIEVE. SUPERVISION AND SEALED BY A PROFESSIONAL PERMANENT GROUND COVER ESTABLISHED IN
\ \ ASIN `•
\ \ � - � -�� � � \ \ � / / :. ''--�•°/ 3. PRIOR TO COMPACTION, ALL CLAY CLODS WILL ENGINEER REFEREED IN THE STATE OF NORTH ACCORDANCE WITH THE PERMANENT SEEDING � �
\ \ / BE BROKEN DOWN WITH TILLERS AND/OR DISCS CAROLINA EXPERIENCED IN THE DESIGN OF SCHEDULE. OUTLET PIPE
/ \ \\ \ \ \ \ \ \ \ \ \ / / / 518 ./ / / �° TO PROVIDE A HOMOGENEOUS CLAY SOIL THAT PRECAST CONCRETE. THE DESIGN SHALL INCLUDE
\ \\ \ \ \\\ - \ \\ \\ \ \ \ s90 / / / / 89 IS FREE OF CLAY CLODS LARGER THAN 2 PROVISION S FOR HANDLING STRESSES AND
/ ( ( / / r INCHES IN DIAMETER. CONSTRUCTION LOADS. REPRODUCED COPIES OF A A z
\ s9 \ / / ASTM C789 "STANDARD SPECIFICATIONS FOR ORIFICE OPNIN Z
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1 \ \ \ \ \ \ \ s I ( / / ) / CONSTRUCTION PRECAST REINFORCED CONCRETE BOX SECTIONS 0
o°o \ / \ \ -' �/ 1. CONSTRUCTION METHODS, SAMPLING AND FOR CULVERTS, STORM DRAINS, AND SEWERS" WILL j
9 } \ / / NOT BE ACCEPTED AS A SUBSTITUTED FOR DESIGN. w
TESTING WILL BE RECOMMENDED BY THE
_ / GEOTECHNICAL. TYPICAL TESTS TO BE INCLUDED N
\ ASIN
� \ � ' � •d WEIR OPE ING
LOCA - \ Q \ I ' \ \ 519 \ \ // / ARE MOISTURE CONTENT, IN-PLACE DENSITY,
ATTERBERG LIMITS AND PERMEABILITY TESTING..
2. PRIOR TO SOIL LINER PLACEMENT, THE N
\'\ \ BMP ACCESS \ \\ \ \ \ 96 , \ \ \ \ \ / / \ \ PREPARED SUBGRADE SHALL BE PROOFROLLED L - - - - - - - - - J
\ \ EASEMENT \ ^ \ \ \ - \ \ \ o \� // / '/ \ \ WITH A LOADED DUMP TRUCK (MIN. 20 TONS) EXPANDED METAL GRATE
WET POND 06 - - - - - \\ \ OR SIMILAR RUBBER TIRED PNEUMATIC VEHICLE,
TRASH RACK FOR RISER
\ \ 9, s9 1�v \ \ \ A MINIMUM OF TWO PASSES IN EACH DIRECTION. (SEE DETAILS)
GI 33 ' 9 haP� \l \ 3. LOOSE SOIL LINER FILL LIFT THICKNESS, PRIOR
\ '\ \ \ \ \ \ - rl \ se s� \ \ sse `• \ / \ 520 TO COMPACTION, SHALL BE A MAXIMUM OF 6 (CONTRACTOR SHALL SUBMIT SHOP DRAWINGS
HIBc �\\ s9' \ \ \ \ INCHES. THINNER LIFTS ARE PERMISSIBLE TO FOR APPROVAL BY THE ENGINEER) 5' 5'
Normal Pool \ \ \ \ /
\ \ \ \ \ se4\ \ \ ss s Level 582.5 90 / / \ \\ \\ \ \ \ - /
ACHIEVE DESIGN GRADE AND/OR SOIL LINER o
HIeC / \ \ /A \\ \ / PROPERTY SPECIFICATIONS. TOP OF RISER = 586.50 z
\ gas - \ \ 4. EQUIPMENT OR TRUCK TRAFFIC SHALL NOT BE
583 \ \ / l\ \ \ �A \ \ \\ / PERMITTED DURING THE PERIOD BETWEEN 3' WIDE WEIR = 584.00
SCARIFYING AND COMPACTION OF A LIFT UNLESS -
/ APPROVED BY THE ENGINEER. - 3' WIDE WEIR = 584.00
4" ORIFICE = 582.50
5. SOIL LINER FILL SHALL NOT BE PLACED OR �.
COMPACTED DURING SUSTAINED PERIODS OF AIR EROSION CONTROL L0
4" ORIFICE = 582.50
,� \ \ - - \ s - - - g0 / �� \\ \` \ \ `SO \ \ TEMPERATURES BELOW 32 DEGREES F. IF THE SKIMMER ORFICE TO BE O
COCA J / (l \ \ \ \ \ \\ -♦� \ SOIL LINER FILL FREEZES OR ICES THE FILL SEDIMENT PLUGGED WN ES
SECTION SHALL BE RE-SCARIFIED AND '0 r n _
135 BASIN \ \ \ \ \\ \ \ - / TED TO
ai PERMANENTOWETRPOND v I O
RE-COMPACTED. O
- _ \ \ 6. THE COMPACTED SOIL LINER SHALL BE cV U
1 \ \} s \ \ \ \ \ \ \ - 130 ^ \ } \ \ \�� - CONSTRUCTED TO THE MINIMUM THICKNESS
WATER QUALITY ORIFICE O 000
ASIN \ ` \ `.` SPECIFIED BY THE PROJECT PLANS. TO EXTEND 12" BELOW �% a o�
f \\` 7. AFTER COMPLETION OF A SEGMENT OF
PERMANENT POOL ELEV. SD OUTLET PIPE N
Hlec \ FOREBAY COMPACTED SOIL LINER, BUT BEFORE °_ :�( ��:_ _- �
INSTALLATION OF THE TOPSOIL PROTECTIVE Q
- - N� GI 77 ` LAYER, THE SURFACE OF THE SOIL LINER SHALL OUTLET PIPE INV.: 57s.00 _a- O CV
20' WIDE x 1.5' DEEP _ _ LOCH \ \ \ o \ POND BOTTOM=577.50 �- �_ O 0
\ \ �2D / \ \ \ BE SURVEYED BY THE CONTRACTOR TO ENSURE „ , • _ U �
♦ EMERGENCY SPILLWAY _ FES 79 m 9. THE SPECIFIED THICKNESS OF COMPACTED SOIL ATOP-OF_-SLAB =_-577,00_- �� �� ���� �, / %< N
-5 74, \ _ CS \ \ _ \ i \ ` \ �m� \ 1 LINER. /�/�/�/�/�i��/� \ r> L T
\ SEE DETAIL \ \ � � \ \ � \ \\ \ \ \ ` \ �� �� �� �� �� _\ \ -=° -: ° -:° - ° -:• �� �i��j��j��j=�!���1\• ._• -.__o.._• -._ o.._• -._ '-._• ._ ,���� r 1 w
CD 0
-578 88 4° RCP 1 \yes - - NCDEQ WILL REQUIRE AN OPEN OPERATION AND ��NOTE /��/ /��/��/��/��/��/��/� ��/� /��/��/ /��/��/��/��/��/��/� ��/� r N
�� \ \/, \\ \\ \\ \\ \\ \\ \\ \\ \/, \\ \\ \\ \\ \\ \\ \\ \\ 4-
S 0.50% \ I sej \ MAINTENANCE PLAN AND INSPECTION AND
MAINTENANCE AGREEMENT. 10' 10' 3
584 -
1 ��\ �' _ \ \ ~ \ \ �� 587 586 Jay \ \\ss�sgs \ \ \\ SECTION A-A U
\ \ \ \ 84 LF 30 RCP / J58a
0 4.54% /\ / 588 � \ ��se2`a.\ \\\ \\ `
\ �1 FES #93 \ \� \ 586 sal - sass," \ \ \ \ 1. OUTFACE STRUCTURE SHALL HAVE 6" THICK WALLS.
584 say _ 0�\ \\ \ \\ \ \ 2. INSIDE DIMENSIONS OF OUTFALL STRUCTURE SHALL BE 5'x5'.
3. ENDS OF ALL PIPES SHALL BE FLUSH WITH INSIDE WALL OF STRUCTURE.
\ \\ \ �) � _ \ \ / \� 583 / _ --- ----- s>8 \ \ \ \ \ 4. PIPE OPENING TO BE WATERTIGHT
_-582._- � CONTROL STRUCTURE
\ =
GRAPHIC SCALE - L 3 p _
RA \
- �\ // 57 '� / r `s's, \ / \� \ \ \ \ \ \ \ NOT TO SCALE
30 /�0 15 30 \\ 60 A, 120 1 \ /' / ' - 574-
r 1 \ / \ ` - - - ,-ter �-� + + + + + + + + + /+ + +\+ + + + + J
/♦ \I✓ ( IN FEET ) ' T �� T= T�+�+ ++ + + + + + + +� + + + + + + + + + + + + + +\+
4 / I inch = 30 ft. �� + + + + + +++++ ++++++++++++++++++++++++++++++ ++ + + + ++ + +++ + + + + +� + Ln Q
J Ld
PLANT SCHEDULE U) wW a o
ORNAMENTAL GRASSES AND GROUNDCOVERS
QUANTITY ABBREVIATION SCIENTIFIC NAME COMMON NAME PLANTING SIZE MISCELLANEOUS / REMARKS z = co
534 ASIN Asclepius incarnata Swamp Milkweed CONT. ; 4" POTS Full and well formed QT
428 HIBC Hibiscus coccineus Scarlett Rose Mallow CONT. 4" POTS Full and well formed Z z I Z
513 LOCA Lobelia cardinalis Cardinal Flower CONT. ; 4" POTS Full and well formed U O Q
SAFETY FENCE
S (ALONG PERIMETER) U J
v. Z 0
o- o-
POND SECTIONAL VIEW W z
��J//�� � cn Z
TRASH RACK U) U O
- BASIN LENGTH SEE PLAN 10' MINIMUM
STORMWATER W LLI
PROVIDE RUNOFF
-i NOTE: l---- SOP OF EMBANKMENT = 588.00
WATERTIGHT S RISER CREST = 586.50 , `
72" \ TOP OF RISER WILL BE INSTALLED AT - - - - \EMERGENCY SPILLWAY = 586.50 `J
CONNECTION \ 2-YR WATER SURFACE ELEVATION = 584.53 / (SEE DETAIL)
72" \ 585.50 DURING INITIAL AND INTERMEDIATE 10-YR WATER SURFACE ELEVATION = 585.56 / EARTHEN DAM \
v v
Uj
PHASE. IT WILL BE CONVERTED TO 586.50 25-YR WATER SURFACE LEVATION = 86.58 \
L2"x2"xl/4" GALV" 12" THICK (MIN.) ? DURING THE FINAL AND PERMANENT PHASES. So-vR WATER SURFACE LEVATION = 86.58
S E 5
S E 5
STEEL ANGLE (TYP) L2"x2"x1/4" GALVANIZED ANGLE CAST-IN-PLACE OR PRECAST 100-YR WATER SURFACE ELEVATION = 586.79 \ Y
CONCRETE COLLAR _ MIN. 2' 6' TYP _ SEE(DETNL.COL PR
OVERLAPPED AND BOLTED TO __ \
WELDED FRAME FOR RESTRAIN BAR GRATE AND AND MIN. 2000 PSI ( ) li
STILL ALLOW REMOVAL ----- �AsiN NLET VEGET4 TIVSHELF --- \
FRAME BOLTED TO �J I �7
BAR GRATE PANELS TOP OF CONCRETE ( ) --� E NORMAL WATER = 582.50 _ CONTROL \
a STORM BOX WITH I" THICK 6:1 SLOPE o - STRUCTURE
r` iv BAR GRATE 1/4" x I" GALVANIZED HEXHEAD /r SEE FLIP-RAP APRON
60"x60" INSIDE ,, ANTI-SEEP COLLAR SPECIFICATIONS �,1ETATI'E SHELF �
BOLT, WASHERS, & NUT o6rn1L1
AND \ SEDIMENT o 0 0 5.0'PERMANENT / s:i SLOPE - ___ (SEE DETAIL)
TACK-WELD NUT TO BACK SIDE RISER TO FOREBAY F EE ER PODL DEPTH -
72"X72' OUTSIDE PIPE \ SEE DETAIL �
DIMENSIONS ID DIA. S NO. OF FIRST _____ ) ______ SEDIMENT STORAGE ELEV =578.00 ____________J ---
CL-II RIPRAP
(IN) (IN) COLLARS COLLAR STABILIZATION BASIN BOTTOM = 577.50 `~"`
(FT) _
WET POND FOREBAY EXIT JOB N0: J-27842"0005
30 66 1 25 SEDIMENT STORAGE
06 ELEV: 577.50 12" CLAY LINER SHALL BE BASIN BOTTOM SLOPE CLASS IV RCP DATE: 9/5/23
FOREBAY ENTRANCE RISER ANTI-FLOTATION
- 61" x 61" LOWER WELDED ELEV: 577.50 CONSTRUCTED OR COMPACTED (0.5% MIN.) OUTLET PIPE WITH DRAWN: LSE
SUCH THAT INFILTRATION RATE DESIGNED: LSE
FRAME L2"x2"xl/4" NOTES: DUCTILE IRON MAINTENANCE WATERTIGHT JOINTS
QTY=1 GALVANIZED ANGLE 1. ALL COLLARS SHALL BE INSTALLED TO BE IS NOT MORE THAN .011N/HR DRAIN PIPE WITH SLUICE
5/16" HOLES 72" x 72" WATER-TIGHT. FOREBAY ENTRANCE GATE OR VALVE AT RISER REVIEWED: MSK
I/4"x4" GALV" STEEL ELEV: 577.00 (0.50% SLOPE, MIN.) NOTE: SEE GRADING PLAN SHEET C3.2
FOR CONC" ANCHOR I"x3" GALV" STEEL OR 2. COLLAR DIMENSIONS TO EXTEND 18" (MIN) BEYOND APPROVED: MSK 1
BOLTS(TYP) ALUMINUM BAR GRATE CONCRETE EXPANSION BOLT SPECIFIED PIPE DIAMETER ON ALL SIDES. FOR PIPE INVERTS, PIPE SIZE, AND PIPE SCALE: = 40'
3. FIRST ANTI-SEEP COLLAR TO BE LOCATED SLIGHTLY LENGTHS
FRAME & BAR GRATE CONSTRUCTION BAR GRATE INSTALLATION DOWNSTREAM OF DAM CENTER LINE. SEDIMENT STORAGE NOT TO SCALE
N"T"S" N"T"S" FOREBAY EXIT
EXPANDED METAL GRATE TRASH RACK FOR RISER ANTI-SEEP COLLAR ELEV: 578.00
NOT TO SCALE NOT TO SCALE
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