SW3220302_Plansheet C12 - SCM Detail_20220613

4
� 4
15
\ 5 �w
B5 17 I �3
)_­� __ I 02-CB
,849 848RIM:854.12/
S-02CB 38 LF OF 24" CLASS III RCP, O-RING
01-FES
INV IN:842.10 (02-CB)
/ \;A L;� SAND FILTER
SURFACE ELEV = 841.5
AREA = 525 SF
� 2
\- \- - 7 - / II -
RIP -RAP ENTIRE BOTTOM
OF FOREBAY. EL: 842.00
s � I
CID 2' RIP -RAP BERM
n
o 0
\.
o CID
w-
0
0 0 0
n
10,
30'
i
18 2
i
INV OUT: 839.00
1
BMP ACCESS EASEMNT
TOP OF BERM: 847.00
IEX. RCP
I 1
PIPE OCS PIPE 51 LF OF 15" CLASS III RCP,
,zI
to DOGHOUSE MANHOLE
CID OVER EXISTING RCP
CLEANOUT UPTURN LOCAT'll OCS `bib (01 I
/ O � / PROP. JB-03
v RIM:843.47
/ cp A847 INV IN:838.29 (EX JB-04)
so c I INV IN:838.50 (OCS)
�-w
ss 6, o G INV OUT:838.29
PROVIDE WASTOP INLINE CHECK VALVE
OR EQUIVALENT ON OCS OUTLET PIPE.
• -� � 10' SPILLWAY LINED y,�/(SEE DETAIL SHEET C11)
I � RIP -RAP @ EL: 845.50
I � I
SAND FILTER PLAN
1" 20'
CONCRETE ANTI SEEP COLLARS
POND SECTION
N.T.S.
- 11=1 I -1 11=1 I IM I I=1
I-1 I I=1 I I=1 11=1 I M I I
-III=III=III=III=III=III=III=III=III- Im
I I-1 11=1 11=1 11=1 11=1 11=1 11=1 11=1 11=1 11-1 I I, ,.
-1 I I -III -I 11=1 11=1 11=1 11=1 I'-�-
IIIIIIIIIIIIIII11I 6 INV IN: 839.00
1IIIIIIIIIIIIIII-1 11=1 I I=11 IIII-11
15"RCP Q0.98%
-III=1II=1II III
LI
1 1 1=-111=11
-
15" RCP
INV OUT 839.00 =1 1=1 -III 1=1 11=1 11-I I I-
-
CONCRETE ANCHOR
ANTI -FLOTATION BLOCK
6'X 6'X 3'THICK
EVENT
RUNOFF
RUNOFF
RUNOFF
ELEVATION
TOP OF DAM
847.00
SPILLWAY
845.50
50Y R-6H R
11.22
19.42
8.65
845.94
1 OY R-6H R
7.21
12.61
l. l b
845.10
1 Y R-24H R
3.43
6.09
0.46
843.94
BMP
REQUIRED
PROVIDED
ELEVATION
WQV
4,476 CU.FT
4,611 CU.FT.
843.50
SAND FILTER
511 S.F
525 S.F.
TOP 841.5
SAND FILTER BMP SUMMARY CHART
PEAK CONTROL STORM
PRE DEVELOPMENT
POST DEVELOPMENT
POST -ROUTING
IMPERVIOUS SUMMARY
ITEM SQUARE ACRES PERCENTAGE OF
FOOT TOTAL SITE
TOTAL SITE AREA 195,759 SF 4.494 AC N/A
EXISTING BUA 50,545 SF 1.16 AC 25.82 %
EXISTING BUA TO BE REMOVED 16,572 SF 0.38 AC 8.47 %
EXISTING BUA TO REMAIN 33,973 SF 0.78 AC 17.35 %
PROP. PARKING 51,222 SF 1.18 AC 26.17 %
PROP. SIDEWALK 1,600 SF 0.04 AC 0.82 %
PROP. BUILDING 17,203 SF 0.39 AC 8.79 %
FUTURE BUA 17,360 SF 0.40 AC 8.87 %
PROPOSED BUA 87,385 SF 2.01 AC 44.64 %
TOTAL NEW IMPERVIOUS 121,358 SF 2.79 AC 61.99 %
IMPERVIOUS NET CHANGE 70,813 SF 1.63 AC 36.17 %
TOTAL PERVIOUS 74,401 SF 1.71 AC 38.01 %
2:1 SIDE SLOPES BETWEEN FOREBAY & MAIN POND.
USE CLASS 1 RIP RAP OVER FILTER FABRIC.
LINE FOREBAY WITH 6" OF #57 STONE (WASHED)
DIAMETER CLEANOUT (TYP.)
WASHED SAND BERMUDA SOD
RIPRAP FOREBAY BERM
ELEV. 843.50
-50YR=845.94 -
10YR=845.10
1 YR = 843.94
WQv ELEV. 843.50 'I -III -III -I
FOREBAY
20OF WQv=871 FTA3REQ'D m+dmdmd"�d�'I IJd_ �-III-III-III-III=
-III-II1=1I1=1I1=1I1=1
n TOP SAND 841.5 v = 1 nnn FTA3 PRnvIDFr)
SAND TO BE ASTM C33
ITi II I112„IGRAVE 1II II II -I I- -I -I OPEN WEB MAT AROUND UNDER
DRAIN & GRAVEL BED (ALL SIDES)
(12" OF #57 WASHED
STONE AND FILTER FABRIC) SCARIFY SUBGRADE TO 18" MIN. & LEAVE
UNCOMPACTED IN ACCORDANCE WITH
CHAR LOTTE/M ECKLEN BURG BMP MANUAL
6" DIA. PERFORATED UNDERDRAIN - PVC
AASHTO M252 OR HDPE WITH SMOOTH INNER
WALL, WRAPPED WITH FILTER FABRIC.
PROVIDE 4" MIN. COVER OVER PVC
IMPERVIOUS SUMMARY - BMP
ITEM SQUARE FOOT ACRES
TOTAL SITE AREA 195,759 SF 4.49 AC
DRAINAGE AREA 119,449 SF 2.74 AC
OFFSITE BUA TO BMP 2,116 SF 0.05 AC
ONSITE BUA TO BMP 70,813 SF 1.63 AC
TOTAL BUA TO BMP 72,929 SF 1.67 AC
ITEM PERCENTAGE
BUA % OF SITE AREA 37.25 %
BUA % OF DA 61.05 %
TOP 846.00
THE UNDERDRAIN COLLECTION SYSTEM SHOULD BE EQUIPPED WITH A 6-INCH MIN
PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE OR DOUBLE WALL HDPE PIPE.
PERFORATIONS SHALL BE PER AASHTO M278 FOR PVC PIPE, AASHTO M252 FOR DOUBLE WALL
HDPE PIPE OR BE 3/8-INCH IN DIAMETER SPACED 3-INCHES ON CENTER ALONG 3
LONGITUDINAL ROWS THAT ARE SPACED 6' APART. THE PIPES SHALL HAVE A MIN SLOPE ON
0.05% AND A MAXIMUM SPACING OF 10' ON CENTER.
2. PLACE THE SAND -BASED, WASHED BERMUDA SOD DIRECTLY ON THE SAND MIXTURE
3. DO NOT USE TOPSOIL ON TOP OF THE SAND MEDIA.
4. PROVIDE STONE FACING ON ALL EXPOSED SIDES OF CONIC. STRURCTURE (TO MATCH
BUILDING).
5. CLEANOUTS OF 6-INCH SOLID PVC MUST BE PROVIDED FOR EVERY 50 LINEAR FEET OF
UNDERDRAIN, AT ALL BENDS, AND ENDS OF THE SYSTEM FOR MAINTENANCE PURPOSES. THE
TOP OF THE CLEANOUTS SHOULD EXTEND 6 INCHES ABOVE THE TOP OF FILTER AND HAVE
WATERTIGHT, VANDAL -PROOF CAP. AT LEAST ONE CLEANOUT SHALL BE INSTALLED AS AN
EMERGENCY DRAIN THAT IS FLUSH WITH THE TOP OF THE FILTER AND HAVE A 6-INCH
THREADED EXTENSION PIPE. THE FURTHEST CLEANOUT FROM THE OUTLET MUST HAVE THE
MINIMUM REQUIRED FILTER MEDIUM DEPTH.
i
A
1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING APPROPRIATE
PARTIES AND ASSURING THAT EXISTING UTILITIES ARE LOCATED PRIOR TO
BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAGMEN, ETC., AS NECESSARY TO INSURE SAFETY TO THE PUBLIC.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE REPLACED
ACCORDING TO STANDARDS OF THE DEPARTMENT OF TRANSPORTATION.
4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS PART
1926 SUBPART P, OR AS AMENDED.
SAND FILTER NOTES
Know what's below.
Call before you dig.
1. AVOID DISTURBING THE PROPOSED SAND FILTER AREA UNTIL AFTER THE INITIAL ROUGH GRADING AND TEMPORARY STABILIZATION HAS BEEN PERFORMED.
2. EXCAVATE THE SAND FILTER TO THE DESIGN DIMENSIONS
3. THE UNDERDRAIN SYSTEM SHALL BE EQUIPPED WITH 6-INCH MINIMUM PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE, AASHTO M252 FOR DOUBLE WALL HDPE OR BE %" IN
DIAMETER SSPACED 3 INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACES 90" APART. THE UNDERDRAIN PIPES SHALL BE INSTALLED AT 0%SLOPE.
4. SOIL AND GRAVEL COVER OVER THE UNDERDRAIN SHALL BE AT LEAST 3.0 FEET IN DEPTH.
5. GRAVEL BED MATERIALS (STONE) SIZE SHALL NOT BE GREATER THANY2 TO 0/2 INCHES IN DIAMETER. (BLUE STONE, DOUBLE WASHED, #57)
6. FILTER FABRIC MUST MEET A MINIMUM PERMEABILITY RATE OF 75 GALLONS/MIN/SQUARE FOOT AND SHALL NOT IMPEDE THE INFILTRATION RATE OF THE SOIL MEDIUM. NON -WOVEN
FABRIC IS REQUIRED. INSTALLATION REQUIRES AT LEAST 1 FOOT OVERLAP AT THE ENDS AND STRIKING IN PLACE DURING CONSTRUCTION AT THE TUNED SURFACES.
7. SOIL PREPARATION TO BE IN ACCORDANCE WITH NCDEQ DESIGN MANUAL.
SAND FILTER MAINTENANCE
1. THE OWNER AND ALL SUBSEQUENT OWNERS OF THE PROPERTY SHALL ACCEPT RESPONSIBILITY AND MAINTENANCE OF ALL ON SITE SAND FILTER AND BMP FACILITIES. THE OWNER
WILL PROVIDE MAINTENANCE TO THE FACILITIES AS DESCRIBED IN THE PROJECT OPERATIONS AND MAINTENANCE MANUAL AS WELL AS THE LINCOLN COUNTY STORMWATER
ORDINANCE AND THE NCDEQ BMP MANUAL.
2. BMP SHALL BE PERIODICALLY INSPECTED BY THE OWNER OR OWNER'S REPRESENTATIVE AS DESCRIBED IN THE MAINTENANCE MANUAL AND SCHEDULE TO IDENTIFY MAINTENANCE
AND REPAIR NEEDS AND TO ENSURE COMPLIANCE WITH THE REQUIREMENTS OF THE MAINTENANCE SCHEDULE. ANY IDENTIFIED MAINTENANCE AND/OR REPAIR NEEDS SHALL BE
ADDRESSED IN A TIMELY MANNER. RECORDS SHALL BE MAINTAINED BY THE OWNER AND REVIEWED BY COUNTY PERSONNEL WHEN REQUESTED.
REPAIR TO THE EXISTING SAND FILTERS
1. THE CONTRACTOR SHALL RE -CONSTRUCT THE EXISTING SAND FILTER PER THESE CONSTRUCTION PLANS AND PER NCDEQ DESIGN MANUAL. FOR MORE SPECIFIC INFORMATION ON
THE CONSTRUCTING AND MATERIALS FOR THE SAND FILTER, REFER TO SAND FILTER SPECIFICATIONS FOR THIS PROJECT.
2. WHEN BACKFILLING THE FACILITY, SOIL SHOULD BE PLACED IN LIFTS 12 TO 18 INCHES DEEP. HEAVY EQUIPMENT SHOULD NOT BE PLACED WITHIN THE SAND FILTER BASIN. HEAVY
EQUIPMENT CAN BE USED AROUND THE PERIMETER OF THE BASIN TO SUPPLY SOILS AND SAND. WITHOUT SOME COMPACTION, DIFFERENTIAL SETTLEMENT MAY OCCUR. SAND FILTER
MATERIALS SHOULD BE GRADED WITH LIGHT EQUIPMENT SUCH AS COMPACT LOADER OR DOZER / LOADER WITH MARSH TRACKS. IN ADDITIONS, PRESOAKING OF THE FACILITY
SHOULD BE USED TO HELP SETTLE THE MATERIAL.
INSPECTION NOTES
1. INSPECTIONS SHALL BE CONDUCTED AS PRESCRIBED BY THE MAINTENANCE COVENANT. ADDITIONAL INSPECTIONS MAY BE CONDUCTED BY MUNICIPALITY ON ANY REASONABLE
BASIS, INCLUDING BUT NOT LIMITED TO: ROUTINE INSPECTIONS; RANDOM INSPECTIONS; INSPECTIONS BASED UPON COMPLAINTS OR OTHER NOTICE OF POSSIBLE VIOLATIONS;
INSPECTIONS OF DRAINAGE BASINS OR AREAS IDENTIFIED AS HIGHER THAN TYPICAL SOURCES OF SEDIMENT OR OTHER CONTAMINANTS OR POLLUTANTS; INSPECTIONS OF
BUSINESSES OR INDUSTRIES OF A TYPE ASSOCIATED WITH HIGHER THAN USUAL DISCHARGES OR POLLUTANTS OR WITH DISCHARGES OF A TYPE WHICH ARE MORE LIKELY THAN THE
TYPICAL DISCHARGE TO CAUSE VIOLATIONS OF STATE AND FEDERAL WATER QUALITY STANDARDS OR THE NPDES STORM WATER PERMIT; AND JOINT INSPECTIONS WITH OTHER
AGENCIES UNDER ENVIRONMENTAL AND SAFETY LAWS. INSPECTIONS MAY INCLUDE BUT ARE NOT LIMITED TO: REVIEWING MAINTENANCE AND REPAIR RECORDS; SAMPLING
DISCHARGES, SURFACE WATER, GROUNDWATER, AND MATERIAL OR WATER IN BMPS; EVALUATING THE CONDITION OF THE BMPS AND STORMWATER MANAGEMENT PRACTICES.
2. RIGHT-OF-WAY ENTRY FOR INSPECTION, WHEN ANY NEW BMP IS INSTALLED, THE PROPERTY OWNER SHALL GRANT THE MUNICIPALITY THE RIGHT TO ENTER THE PROPERTY AT
REASONABLE TIMES AND IN A REASONABLE MANNER FOR THE PURPOSES OF INSPECTION. THIS INCLUDES THE RIGHT TO ENTER A PROPERTY WHEN THE MUNICIPALITY HAS A
REASONABLE BASIS TO BELIEVE THAT A VIOLATION OF THIS REGULATION IS OCCURRING OR HAS OCCURRED, AND TO ENTER WHEN NECESSARY FOR ABATEMENT OF A PUBLIC
NUISANCE OR CORRECTION OF A VIOLATION OF THIS REGULATION.
STORM DRAINAGE AS -BUILT REQUIREMENTS
1. THE CONTRACTOR SHALL FURNISH AN AS -BUILT SURVEY OF THE STORM DRAINAGE AND BASIN IN PRINTED HARD COPY AND CAD FILE FORMAT, SIGNED AND SEALED BY A LAND
SURVEYOR LICENSED IN NORTH CAROLINA. THE CAD FILE SHALL BE BASED ON NC GRID, NAV 1983 (TIED TO STATE PLANE COORDINATE SYSTEM). ELEVATIONS SHALL BE TIED TO
NAVD88.
2. THE AS -BUILT SURVEY SHALL PROVIDE THE FOLLOWING INFORMATION: STORM DRAINAGE PIPE LOCATIONS WITH SIZE LENGTH AND MATERIAL; STORM DRAINAGE INLET OUTLET
AND CLEAN OUT STRUCTURE LOCATIONS WITH RIM AND INVERT ELEVATIONS AT EACH PIPE, WITH INVERT AND TOP OF WEIR ELEVATION FOR ANY INTERNAL BAFFLE WALLS INSIDE OF
STRUCTURE; FINISHED GRADE CONTOURS OF BASIN AT 1 FOOT INTERVALS, WITH SQUARE FOOTAGE OF THE BASIN; INSIDE DIMENSIONS OF INLET AND OUTLET STRUCTURES WITHIN THE
BASIN AT 25 FOOT INTERVALS MAXIMUM.
3. THE AS -BUILT SURVEY SHALL BE SUBMITTED TO THE DESIGN ENGINEER AT LEAST 45 DAYS PRIOR TO THE ANTICIPATED DATE OF COMPLETION OF OCCUPANCY.
NOTICE TO CONTRACTOR
PROVIDE PICTURES OF BMP, UNDERDRAIN, AND SAND FILTER
INSTALLATION TO ENGINEER AT TIME OF ASBUILTS.
NOTICE TO CONTRACTOR
PROVIDE AN UPDATED OUTLET STRUCTURE DETAIL CUT SHEET
FROM THE ENGINEER TO THE WATER QUALITY INSPECTOR
PRIOR TO CONSTRUCTION. THE UPDATED CUT SHEET SHALL
BE PROVIDED ON THE BMP AS -BUILT SUBMITTAL.
EL. = 846.00 MAX.
I � �
I I I I
I I I I
I I I I
I I I I
I I I I
I I �
I I I I
I I I I
I O
6" ORIFICE
+843.50 OPEN THIS SIDE ONLY)
I I I I
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
I I I I
TOP OF SAND ELEVATION = 841.50 4.0'
I I
I I
I I
I L-
15'' RCP OUT - INV. 839.00
I I I Ti
EL. = 839.00 EL. - 839.00 1
- -- -J
6" DIA ORIFICE FROM SAND
FILTER UNDERDRAIN - INV. 839.00
SOUTHHWEST FACE NORTHWEST FACE
POND OUTLET DETAILS
N.T.S.
MANHOLE FOR ACCESS
PER NCDOT STANDARD
COVER 6'' ORIFICE W/ METAL
PLATE DURING EROSION
CONTROL PHASES
6" ORIFICE
843.50 OPEN THIS SIDE ONLY)
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
15'' RCP OUT - INV. 839.00
6" DIA ORIFICE FROM SAND
FILTER UNDERDRAIN - INV. 839.00
2:1 SIDE SLOPES BETWEEN FOREBAY & MAIN POND.
USE CLASS 1 RIP RAP OVER FILTER FABRIC.
LINE FOREBAY WITH 6" OF #57 STONE (WASHED)
DIAMETER CLEANOUT (TYP.)
WASHED SAND BERMUDA SOD
RIPRAP FOREBAY BERM
ELEV. 843.50
-50YR=845.94 -
10YR=845.10
1 YR = 843.94
WQv ELEV. 843.50 'I -III -III -I
FOREBAY
20OF WQv=871 FTA3REQ'D m+dmdmd"�d�'I IJd_ �-III-III-III-III=
-III-II1=1I1=1I1=1I1=1
n TOP SAND 841.5 v = 1 nnn FTA3 PRnvIDFr)
SAND TO BE ASTM C33
ITi II I112„IGRAVE 1II II II -I I- -I -I OPEN WEB MAT AROUND UNDER
DRAIN & GRAVEL BED (ALL SIDES)
(12" OF #57 WASHED
STONE AND FILTER FABRIC) SCARIFY SUBGRADE TO 18" MIN. & LEAVE
UNCOMPACTED IN ACCORDANCE WITH
CHAR LOTTE/M ECKLEN BURG BMP MANUAL
6" DIA. PERFORATED UNDERDRAIN - PVC
AASHTO M252 OR HDPE WITH SMOOTH INNER
WALL, WRAPPED WITH FILTER FABRIC.
PROVIDE 4" MIN. COVER OVER PVC
IMPERVIOUS SUMMARY - BMP
ITEM SQUARE FOOT ACRES
TOTAL SITE AREA 195,759 SF 4.49 AC
DRAINAGE AREA 119,449 SF 2.74 AC
OFFSITE BUA TO BMP 2,116 SF 0.05 AC
ONSITE BUA TO BMP 70,813 SF 1.63 AC
TOTAL BUA TO BMP 72,929 SF 1.67 AC
ITEM PERCENTAGE
BUA % OF SITE AREA 37.25 %
BUA % OF DA 61.05 %
TOP 846.00
THE UNDERDRAIN COLLECTION SYSTEM SHOULD BE EQUIPPED WITH A 6-INCH MIN
PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE OR DOUBLE WALL HDPE PIPE.
PERFORATIONS SHALL BE PER AASHTO M278 FOR PVC PIPE, AASHTO M252 FOR DOUBLE WALL
HDPE PIPE OR BE 3/8-INCH IN DIAMETER SPACED 3-INCHES ON CENTER ALONG 3
LONGITUDINAL ROWS THAT ARE SPACED 6' APART. THE PIPES SHALL HAVE A MIN SLOPE ON
0.05% AND A MAXIMUM SPACING OF 10' ON CENTER.
2. PLACE THE SAND -BASED, WASHED BERMUDA SOD DIRECTLY ON THE SAND MIXTURE
3. DO NOT USE TOPSOIL ON TOP OF THE SAND MEDIA.
4. PROVIDE STONE FACING ON ALL EXPOSED SIDES OF CONIC. STRURCTURE (TO MATCH
BUILDING).
5. CLEANOUTS OF 6-INCH SOLID PVC MUST BE PROVIDED FOR EVERY 50 LINEAR FEET OF
UNDERDRAIN, AT ALL BENDS, AND ENDS OF THE SYSTEM FOR MAINTENANCE PURPOSES. THE
TOP OF THE CLEANOUTS SHOULD EXTEND 6 INCHES ABOVE THE TOP OF FILTER AND HAVE
WATERTIGHT, VANDAL -PROOF CAP. AT LEAST ONE CLEANOUT SHALL BE INSTALLED AS AN
EMERGENCY DRAIN THAT IS FLUSH WITH THE TOP OF THE FILTER AND HAVE A 6-INCH
THREADED EXTENSION PIPE. THE FURTHEST CLEANOUT FROM THE OUTLET MUST HAVE THE
MINIMUM REQUIRED FILTER MEDIUM DEPTH.
i
A
1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING APPROPRIATE
PARTIES AND ASSURING THAT EXISTING UTILITIES ARE LOCATED PRIOR TO
BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAGMEN, ETC., AS NECESSARY TO INSURE SAFETY TO THE PUBLIC.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE REPLACED
ACCORDING TO STANDARDS OF THE DEPARTMENT OF TRANSPORTATION.
4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS PART
1926 SUBPART P, OR AS AMENDED.
SAND FILTER NOTES
Know what's below.
Call before you dig.
1. AVOID DISTURBING THE PROPOSED SAND FILTER AREA UNTIL AFTER THE INITIAL ROUGH GRADING AND TEMPORARY STABILIZATION HAS BEEN PERFORMED.
2. EXCAVATE THE SAND FILTER TO THE DESIGN DIMENSIONS
3. THE UNDERDRAIN SYSTEM SHALL BE EQUIPPED WITH 6-INCH MINIMUM PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE, AASHTO M252 FOR DOUBLE WALL HDPE OR BE %" IN
DIAMETER SSPACED 3 INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACES 90" APART. THE UNDERDRAIN PIPES SHALL BE INSTALLED AT 0%SLOPE.
4. SOIL AND GRAVEL COVER OVER THE UNDERDRAIN SHALL BE AT LEAST 3.0 FEET IN DEPTH.
5. GRAVEL BED MATERIALS (STONE) SIZE SHALL NOT BE GREATER THANY2 TO 0/2 INCHES IN DIAMETER. (BLUE STONE, DOUBLE WASHED, #57)
6. FILTER FABRIC MUST MEET A MINIMUM PERMEABILITY RATE OF 75 GALLONS/MIN/SQUARE FOOT AND SHALL NOT IMPEDE THE INFILTRATION RATE OF THE SOIL MEDIUM. NON -WOVEN
FABRIC IS REQUIRED. INSTALLATION REQUIRES AT LEAST 1 FOOT OVERLAP AT THE ENDS AND STRIKING IN PLACE DURING CONSTRUCTION AT THE TUNED SURFACES.
7. SOIL PREPARATION TO BE IN ACCORDANCE WITH NCDEQ DESIGN MANUAL.
SAND FILTER MAINTENANCE
1. THE OWNER AND ALL SUBSEQUENT OWNERS OF THE PROPERTY SHALL ACCEPT RESPONSIBILITY AND MAINTENANCE OF ALL ON SITE SAND FILTER AND BMP FACILITIES. THE OWNER
WILL PROVIDE MAINTENANCE TO THE FACILITIES AS DESCRIBED IN THE PROJECT OPERATIONS AND MAINTENANCE MANUAL AS WELL AS THE LINCOLN COUNTY STORMWATER
ORDINANCE AND THE NCDEQ BMP MANUAL.
2. BMP SHALL BE PERIODICALLY INSPECTED BY THE OWNER OR OWNER'S REPRESENTATIVE AS DESCRIBED IN THE MAINTENANCE MANUAL AND SCHEDULE TO IDENTIFY MAINTENANCE
AND REPAIR NEEDS AND TO ENSURE COMPLIANCE WITH THE REQUIREMENTS OF THE MAINTENANCE SCHEDULE. ANY IDENTIFIED MAINTENANCE AND/OR REPAIR NEEDS SHALL BE
ADDRESSED IN A TIMELY MANNER. RECORDS SHALL BE MAINTAINED BY THE OWNER AND REVIEWED BY COUNTY PERSONNEL WHEN REQUESTED.
REPAIR TO THE EXISTING SAND FILTERS
1. THE CONTRACTOR SHALL RE -CONSTRUCT THE EXISTING SAND FILTER PER THESE CONSTRUCTION PLANS AND PER NCDEQ DESIGN MANUAL. FOR MORE SPECIFIC INFORMATION ON
THE CONSTRUCTING AND MATERIALS FOR THE SAND FILTER, REFER TO SAND FILTER SPECIFICATIONS FOR THIS PROJECT.
2. WHEN BACKFILLING THE FACILITY, SOIL SHOULD BE PLACED IN LIFTS 12 TO 18 INCHES DEEP. HEAVY EQUIPMENT SHOULD NOT BE PLACED WITHIN THE SAND FILTER BASIN. HEAVY
EQUIPMENT CAN BE USED AROUND THE PERIMETER OF THE BASIN TO SUPPLY SOILS AND SAND. WITHOUT SOME COMPACTION, DIFFERENTIAL SETTLEMENT MAY OCCUR. SAND FILTER
MATERIALS SHOULD BE GRADED WITH LIGHT EQUIPMENT SUCH AS COMPACT LOADER OR DOZER / LOADER WITH MARSH TRACKS. IN ADDITIONS, PRESOAKING OF THE FACILITY
SHOULD BE USED TO HELP SETTLE THE MATERIAL.
INSPECTION NOTES
1. INSPECTIONS SHALL BE CONDUCTED AS PRESCRIBED BY THE MAINTENANCE COVENANT. ADDITIONAL INSPECTIONS MAY BE CONDUCTED BY MUNICIPALITY ON ANY REASONABLE
BASIS, INCLUDING BUT NOT LIMITED TO: ROUTINE INSPECTIONS; RANDOM INSPECTIONS; INSPECTIONS BASED UPON COMPLAINTS OR OTHER NOTICE OF POSSIBLE VIOLATIONS;
INSPECTIONS OF DRAINAGE BASINS OR AREAS IDENTIFIED AS HIGHER THAN TYPICAL SOURCES OF SEDIMENT OR OTHER CONTAMINANTS OR POLLUTANTS; INSPECTIONS OF
BUSINESSES OR INDUSTRIES OF A TYPE ASSOCIATED WITH HIGHER THAN USUAL DISCHARGES OR POLLUTANTS OR WITH DISCHARGES OF A TYPE WHICH ARE MORE LIKELY THAN THE
TYPICAL DISCHARGE TO CAUSE VIOLATIONS OF STATE AND FEDERAL WATER QUALITY STANDARDS OR THE NPDES STORM WATER PERMIT; AND JOINT INSPECTIONS WITH OTHER
AGENCIES UNDER ENVIRONMENTAL AND SAFETY LAWS. INSPECTIONS MAY INCLUDE BUT ARE NOT LIMITED TO: REVIEWING MAINTENANCE AND REPAIR RECORDS; SAMPLING
DISCHARGES, SURFACE WATER, GROUNDWATER, AND MATERIAL OR WATER IN BMPS; EVALUATING THE CONDITION OF THE BMPS AND STORMWATER MANAGEMENT PRACTICES.
2. RIGHT-OF-WAY ENTRY FOR INSPECTION, WHEN ANY NEW BMP IS INSTALLED, THE PROPERTY OWNER SHALL GRANT THE MUNICIPALITY THE RIGHT TO ENTER THE PROPERTY AT
REASONABLE TIMES AND IN A REASONABLE MANNER FOR THE PURPOSES OF INSPECTION. THIS INCLUDES THE RIGHT TO ENTER A PROPERTY WHEN THE MUNICIPALITY HAS A
REASONABLE BASIS TO BELIEVE THAT A VIOLATION OF THIS REGULATION IS OCCURRING OR HAS OCCURRED, AND TO ENTER WHEN NECESSARY FOR ABATEMENT OF A PUBLIC
NUISANCE OR CORRECTION OF A VIOLATION OF THIS REGULATION.
STORM DRAINAGE AS -BUILT REQUIREMENTS
1. THE CONTRACTOR SHALL FURNISH AN AS -BUILT SURVEY OF THE STORM DRAINAGE AND BASIN IN PRINTED HARD COPY AND CAD FILE FORMAT, SIGNED AND SEALED BY A LAND
SURVEYOR LICENSED IN NORTH CAROLINA. THE CAD FILE SHALL BE BASED ON NC GRID, NAV 1983 (TIED TO STATE PLANE COORDINATE SYSTEM). ELEVATIONS SHALL BE TIED TO
NAVD88.
2. THE AS -BUILT SURVEY SHALL PROVIDE THE FOLLOWING INFORMATION: STORM DRAINAGE PIPE LOCATIONS WITH SIZE LENGTH AND MATERIAL; STORM DRAINAGE INLET OUTLET
AND CLEAN OUT STRUCTURE LOCATIONS WITH RIM AND INVERT ELEVATIONS AT EACH PIPE, WITH INVERT AND TOP OF WEIR ELEVATION FOR ANY INTERNAL BAFFLE WALLS INSIDE OF
STRUCTURE; FINISHED GRADE CONTOURS OF BASIN AT 1 FOOT INTERVALS, WITH SQUARE FOOTAGE OF THE BASIN; INSIDE DIMENSIONS OF INLET AND OUTLET STRUCTURES WITHIN THE
BASIN AT 25 FOOT INTERVALS MAXIMUM.
3. THE AS -BUILT SURVEY SHALL BE SUBMITTED TO THE DESIGN ENGINEER AT LEAST 45 DAYS PRIOR TO THE ANTICIPATED DATE OF COMPLETION OF OCCUPANCY.
NOTICE TO CONTRACTOR
PROVIDE PICTURES OF BMP, UNDERDRAIN, AND SAND FILTER
INSTALLATION TO ENGINEER AT TIME OF ASBUILTS.
NOTICE TO CONTRACTOR
PROVIDE AN UPDATED OUTLET STRUCTURE DETAIL CUT SHEET
FROM THE ENGINEER TO THE WATER QUALITY INSPECTOR
PRIOR TO CONSTRUCTION. THE UPDATED CUT SHEET SHALL
BE PROVIDED ON THE BMP AS -BUILT SUBMITTAL.
EL. = 846.00 MAX.
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6" ORIFICE
+843.50 OPEN THIS SIDE ONLY)
I I I I
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
I I I I
TOP OF SAND ELEVATION = 841.50 4.0'
I I
I I
I I
I L-
15'' RCP OUT - INV. 839.00
I I I Ti
EL. = 839.00 EL. - 839.00 1
- -- -J
6" DIA ORIFICE FROM SAND
FILTER UNDERDRAIN - INV. 839.00
SOUTHHWEST FACE NORTHWEST FACE
POND OUTLET DETAILS
N.T.S.
MANHOLE FOR ACCESS
PER NCDOT STANDARD
COVER 6'' ORIFICE W/ METAL
PLATE DURING EROSION
CONTROL PHASES
6" ORIFICE
843.50 OPEN THIS SIDE ONLY)
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
15'' RCP OUT - INV. 839.00
6" DIA ORIFICE FROM SAND
FILTER UNDERDRAIN - INV. 839.00
TOP 846.00
THE UNDERDRAIN COLLECTION SYSTEM SHOULD BE EQUIPPED WITH A 6-INCH MIN
PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE OR DOUBLE WALL HDPE PIPE.
PERFORATIONS SHALL BE PER AASHTO M278 FOR PVC PIPE, AASHTO M252 FOR DOUBLE WALL
HDPE PIPE OR BE 3/8-INCH IN DIAMETER SPACED 3-INCHES ON CENTER ALONG 3
LONGITUDINAL ROWS THAT ARE SPACED 6' APART. THE PIPES SHALL HAVE A MIN SLOPE ON
0.05% AND A MAXIMUM SPACING OF 10' ON CENTER.
2. PLACE THE SAND -BASED, WASHED BERMUDA SOD DIRECTLY ON THE SAND MIXTURE
3. DO NOT USE TOPSOIL ON TOP OF THE SAND MEDIA.
4. PROVIDE STONE FACING ON ALL EXPOSED SIDES OF CONIC. STRURCTURE (TO MATCH
BUILDING).
5. CLEANOUTS OF 6-INCH SOLID PVC MUST BE PROVIDED FOR EVERY 50 LINEAR FEET OF
UNDERDRAIN, AT ALL BENDS, AND ENDS OF THE SYSTEM FOR MAINTENANCE PURPOSES. THE
TOP OF THE CLEANOUTS SHOULD EXTEND 6 INCHES ABOVE THE TOP OF FILTER AND HAVE
WATERTIGHT, VANDAL -PROOF CAP. AT LEAST ONE CLEANOUT SHALL BE INSTALLED AS AN
EMERGENCY DRAIN THAT IS FLUSH WITH THE TOP OF THE FILTER AND HAVE A 6-INCH
THREADED EXTENSION PIPE. THE FURTHEST CLEANOUT FROM THE OUTLET MUST HAVE THE
MINIMUM REQUIRED FILTER MEDIUM DEPTH.
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1. CONTRACTOR IS FULLY RESPONSIBLE FOR CONTACTING APPROPRIATE
PARTIES AND ASSURING THAT EXISTING UTILITIES ARE LOCATED PRIOR TO
BEGINNING CONSTRUCTION.
2. CONTRACTOR IS RESPONSIBLE FOR PLACING BARRICADES USING
FLAGMEN, ETC., AS NECESSARY TO INSURE SAFETY TO THE PUBLIC.
3. ALL PAVEMENT CUTS, CONCRETE OR ASPHALT, ARE TO BE REPLACED
ACCORDING TO STANDARDS OF THE DEPARTMENT OF TRANSPORTATION.
4. SHORING WILL BE ACCORDING TO OSHA TRENCHING STANDARDS PART
1926 SUBPART P, OR AS AMENDED.
SAND FILTER NOTES
Know what's below.
Call before you dig.
1. AVOID DISTURBING THE PROPOSED SAND FILTER AREA UNTIL AFTER THE INITIAL ROUGH GRADING AND TEMPORARY STABILIZATION HAS BEEN PERFORMED.
2. EXCAVATE THE SAND FILTER TO THE DESIGN DIMENSIONS
3. THE UNDERDRAIN SYSTEM SHALL BE EQUIPPED WITH 6-INCH MINIMUM PERFORATED SCHEDULE 40 OR STRONGER PVC PIPE, AASHTO M252 FOR DOUBLE WALL HDPE OR BE %" IN
DIAMETER SSPACED 3 INCHES ON CENTER ALONG 4 LONGITUDINAL ROWS THAT ARE SPACES 90" APART. THE UNDERDRAIN PIPES SHALL BE INSTALLED AT 0%SLOPE.
4. SOIL AND GRAVEL COVER OVER THE UNDERDRAIN SHALL BE AT LEAST 3.0 FEET IN DEPTH.
5. GRAVEL BED MATERIALS (STONE) SIZE SHALL NOT BE GREATER THANY2 TO 0/2 INCHES IN DIAMETER. (BLUE STONE, DOUBLE WASHED, #57)
6. FILTER FABRIC MUST MEET A MINIMUM PERMEABILITY RATE OF 75 GALLONS/MIN/SQUARE FOOT AND SHALL NOT IMPEDE THE INFILTRATION RATE OF THE SOIL MEDIUM. NON -WOVEN
FABRIC IS REQUIRED. INSTALLATION REQUIRES AT LEAST 1 FOOT OVERLAP AT THE ENDS AND STRIKING IN PLACE DURING CONSTRUCTION AT THE TUNED SURFACES.
7. SOIL PREPARATION TO BE IN ACCORDANCE WITH NCDEQ DESIGN MANUAL.
SAND FILTER MAINTENANCE
1. THE OWNER AND ALL SUBSEQUENT OWNERS OF THE PROPERTY SHALL ACCEPT RESPONSIBILITY AND MAINTENANCE OF ALL ON SITE SAND FILTER AND BMP FACILITIES. THE OWNER
WILL PROVIDE MAINTENANCE TO THE FACILITIES AS DESCRIBED IN THE PROJECT OPERATIONS AND MAINTENANCE MANUAL AS WELL AS THE LINCOLN COUNTY STORMWATER
ORDINANCE AND THE NCDEQ BMP MANUAL.
2. BMP SHALL BE PERIODICALLY INSPECTED BY THE OWNER OR OWNER'S REPRESENTATIVE AS DESCRIBED IN THE MAINTENANCE MANUAL AND SCHEDULE TO IDENTIFY MAINTENANCE
AND REPAIR NEEDS AND TO ENSURE COMPLIANCE WITH THE REQUIREMENTS OF THE MAINTENANCE SCHEDULE. ANY IDENTIFIED MAINTENANCE AND/OR REPAIR NEEDS SHALL BE
ADDRESSED IN A TIMELY MANNER. RECORDS SHALL BE MAINTAINED BY THE OWNER AND REVIEWED BY COUNTY PERSONNEL WHEN REQUESTED.
REPAIR TO THE EXISTING SAND FILTERS
1. THE CONTRACTOR SHALL RE -CONSTRUCT THE EXISTING SAND FILTER PER THESE CONSTRUCTION PLANS AND PER NCDEQ DESIGN MANUAL. FOR MORE SPECIFIC INFORMATION ON
THE CONSTRUCTING AND MATERIALS FOR THE SAND FILTER, REFER TO SAND FILTER SPECIFICATIONS FOR THIS PROJECT.
2. WHEN BACKFILLING THE FACILITY, SOIL SHOULD BE PLACED IN LIFTS 12 TO 18 INCHES DEEP. HEAVY EQUIPMENT SHOULD NOT BE PLACED WITHIN THE SAND FILTER BASIN. HEAVY
EQUIPMENT CAN BE USED AROUND THE PERIMETER OF THE BASIN TO SUPPLY SOILS AND SAND. WITHOUT SOME COMPACTION, DIFFERENTIAL SETTLEMENT MAY OCCUR. SAND FILTER
MATERIALS SHOULD BE GRADED WITH LIGHT EQUIPMENT SUCH AS COMPACT LOADER OR DOZER / LOADER WITH MARSH TRACKS. IN ADDITIONS, PRESOAKING OF THE FACILITY
SHOULD BE USED TO HELP SETTLE THE MATERIAL.
INSPECTION NOTES
1. INSPECTIONS SHALL BE CONDUCTED AS PRESCRIBED BY THE MAINTENANCE COVENANT. ADDITIONAL INSPECTIONS MAY BE CONDUCTED BY MUNICIPALITY ON ANY REASONABLE
BASIS, INCLUDING BUT NOT LIMITED TO: ROUTINE INSPECTIONS; RANDOM INSPECTIONS; INSPECTIONS BASED UPON COMPLAINTS OR OTHER NOTICE OF POSSIBLE VIOLATIONS;
INSPECTIONS OF DRAINAGE BASINS OR AREAS IDENTIFIED AS HIGHER THAN TYPICAL SOURCES OF SEDIMENT OR OTHER CONTAMINANTS OR POLLUTANTS; INSPECTIONS OF
BUSINESSES OR INDUSTRIES OF A TYPE ASSOCIATED WITH HIGHER THAN USUAL DISCHARGES OR POLLUTANTS OR WITH DISCHARGES OF A TYPE WHICH ARE MORE LIKELY THAN THE
TYPICAL DISCHARGE TO CAUSE VIOLATIONS OF STATE AND FEDERAL WATER QUALITY STANDARDS OR THE NPDES STORM WATER PERMIT; AND JOINT INSPECTIONS WITH OTHER
AGENCIES UNDER ENVIRONMENTAL AND SAFETY LAWS. INSPECTIONS MAY INCLUDE BUT ARE NOT LIMITED TO: REVIEWING MAINTENANCE AND REPAIR RECORDS; SAMPLING
DISCHARGES, SURFACE WATER, GROUNDWATER, AND MATERIAL OR WATER IN BMPS; EVALUATING THE CONDITION OF THE BMPS AND STORMWATER MANAGEMENT PRACTICES.
2. RIGHT-OF-WAY ENTRY FOR INSPECTION, WHEN ANY NEW BMP IS INSTALLED, THE PROPERTY OWNER SHALL GRANT THE MUNICIPALITY THE RIGHT TO ENTER THE PROPERTY AT
REASONABLE TIMES AND IN A REASONABLE MANNER FOR THE PURPOSES OF INSPECTION. THIS INCLUDES THE RIGHT TO ENTER A PROPERTY WHEN THE MUNICIPALITY HAS A
REASONABLE BASIS TO BELIEVE THAT A VIOLATION OF THIS REGULATION IS OCCURRING OR HAS OCCURRED, AND TO ENTER WHEN NECESSARY FOR ABATEMENT OF A PUBLIC
NUISANCE OR CORRECTION OF A VIOLATION OF THIS REGULATION.
STORM DRAINAGE AS -BUILT REQUIREMENTS
1. THE CONTRACTOR SHALL FURNISH AN AS -BUILT SURVEY OF THE STORM DRAINAGE AND BASIN IN PRINTED HARD COPY AND CAD FILE FORMAT, SIGNED AND SEALED BY A LAND
SURVEYOR LICENSED IN NORTH CAROLINA. THE CAD FILE SHALL BE BASED ON NC GRID, NAV 1983 (TIED TO STATE PLANE COORDINATE SYSTEM). ELEVATIONS SHALL BE TIED TO
NAVD88.
2. THE AS -BUILT SURVEY SHALL PROVIDE THE FOLLOWING INFORMATION: STORM DRAINAGE PIPE LOCATIONS WITH SIZE LENGTH AND MATERIAL; STORM DRAINAGE INLET OUTLET
AND CLEAN OUT STRUCTURE LOCATIONS WITH RIM AND INVERT ELEVATIONS AT EACH PIPE, WITH INVERT AND TOP OF WEIR ELEVATION FOR ANY INTERNAL BAFFLE WALLS INSIDE OF
STRUCTURE; FINISHED GRADE CONTOURS OF BASIN AT 1 FOOT INTERVALS, WITH SQUARE FOOTAGE OF THE BASIN; INSIDE DIMENSIONS OF INLET AND OUTLET STRUCTURES WITHIN THE
BASIN AT 25 FOOT INTERVALS MAXIMUM.
3. THE AS -BUILT SURVEY SHALL BE SUBMITTED TO THE DESIGN ENGINEER AT LEAST 45 DAYS PRIOR TO THE ANTICIPATED DATE OF COMPLETION OF OCCUPANCY.
NOTICE TO CONTRACTOR
PROVIDE PICTURES OF BMP, UNDERDRAIN, AND SAND FILTER
INSTALLATION TO ENGINEER AT TIME OF ASBUILTS.
NOTICE TO CONTRACTOR
PROVIDE AN UPDATED OUTLET STRUCTURE DETAIL CUT SHEET
FROM THE ENGINEER TO THE WATER QUALITY INSPECTOR
PRIOR TO CONSTRUCTION. THE UPDATED CUT SHEET SHALL
BE PROVIDED ON THE BMP AS -BUILT SUBMITTAL.
EL. = 846.00 MAX.
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6" ORIFICE
+843.50 OPEN THIS SIDE ONLY)
I I I I
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
I I I I
TOP OF SAND ELEVATION = 841.50 4.0'
I I
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I L-
15'' RCP OUT - INV. 839.00
I I I Ti
EL. = 839.00 EL. - 839.00 1
- -- -J
6" DIA ORIFICE FROM SAND
FILTER UNDERDRAIN - INV. 839.00
SOUTHHWEST FACE NORTHWEST FACE
POND OUTLET DETAILS
N.T.S.
MANHOLE FOR ACCESS
PER NCDOT STANDARD
COVER 6'' ORIFICE W/ METAL
PLATE DURING EROSION
CONTROL PHASES
6" ORIFICE
843.50 OPEN THIS SIDE ONLY)
LADDER RUNGS FOR ACCESS
PER NCDOT STANDARD
15'' RCP OUT - INV. 839.00
6" DIA ORIFICE FROM SAND
FILTER UNDERDRAIN - INV. 839.00
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REVISIONS:
A2022-3-29 1ST EC REVIEW
2 2022-5-13 NCDEQ COMMENTS
3 2022-6-9 NCDEQ COMMENTS
C11 - BMP DETAILS.DWG
PROJECT NUMBER:
221011
DATE: 2/4/2022
DRAWN BY: KIW
SHEET C 12
OF 12
C11 - BMP DETAILS.DWG - PLOT: Kennedy - THU. 6-9-2022 3:14 PM