SW3120102_Construction Details_20120208

BMIP elemerrL
Potential blear:
How I will reate the p-L35m-
The entire RMP
Trash/debris is present
Remove the trash/debris
The pen io-retention cell
Areas of tare soil and/or
Regrade the soil if necessary to
erosive gullies have formed
remove the gully, and then plant
a ground cover and water until it
is established. Provide lime and
a one-time fertilizer application
Maintain vegetation at a height
of approximately six inches.
The inlet device: pipe, stone verge or
Swale
The pipe is clogged,
Unclog the pipe. Dispose of the
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged
Erosion is occurring in the
Regrode the swate W necessary
swale.
to smooth it over and provide
erosion control devices such as
reinforced turf matting or 6prap
to avoid future problems with
erosion.
Stone verge is clogged or covered
Remove sediment and clogged stone
in sediment
and replace with clean stone,
The pretreatment area
Flow is bypassing pretreatment
area and/or gullies have formed
Re -grade if necessary to route all
flow to the pretreament area.
Restabilize the area after grading.
Sediments accumulated to a
depth greater than three inches
Search for the source of the sediment
and remedy the problem if possible.
Remove the sediment and restabilize the
pretreatment area.
Erosion has Dccured
Provideadditional erosion protection
such as reinforced turf matting or
rip -rap 9 needed to prevent future
erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand.
e bio-retention I:
Vegetation
Best professional practices
show that pruning is needed
Prune occur 'ng to best
professional practices
to maintain optimal punt
health.
Plants ore dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology. disease,
etc. Remedy the problem and
replace plants. Provide a
one-time fertiizer application to
establish the ground cover ill a
soil test indicates it is necessary.
Tree stakes wires are present sic
Remove tree stakes wires which can
months after planting.
kilt the tree if not removed
The trio -retention cell:
Mulch is breaking down or has
Spot mulch if there are only random void
soils and mulch
floated away.
areas. Replace whale mulch layer if
necessary. Remove the remaining
mulch and replace with triple
shredded hard woad mulch at
a maximum depth of three inches.
Soils and/or mulch are clogged
Determine the extend of the clogging.
with sediment
Remove and replace either just the
top layers or the entire media as needed.
Dispose of the spoil in an appropriate
off -site location. Use triple shredded
hard wood mulch at a maximum depth of
three inches. Search for the source
of the sediment and remedy the
problem if possible.
An annual sail test shows that pH has
Dolomitic lime shall be applied as
dropped or heavy metals have accumulated
recommended per the soil test and
in the soil media
toxic sails stall be removed, disposed
of properly and replaced with new
planting material.
e underdrain system
Clogging has occurred.
Walk out the underdrain system
The drop inlet
Clogging has occured
Clean out the drop inlet. Dispose of the
sediment off -site.
The drop inlet is damaged.
Repair or replace the drop inlet.
The receiving water
Erosion or other signs of
damage have occurred at the
outlet.
Contact the local NC Division of
Water Quality Regional Office, or
the 401 Oversight Unit at
91-733-1786.
BIO-RETENTION SOIL MIXTURE
ITEM
PERCENT E3Y WEIGHT
MATERIAL
SAND
87%
CONSTRUCTION SAND
FINES
8%
SILT
ORGANIC MATTER
5%
COMPOST/PEAT MOSS
PERMEABILITY
2 IN/HR
PHOSPHOROUS INDEX
RANGE BETWEEN 10 AND 30 (CONFIRM WITH SOIL ANALYSIS REPORT
FROM NCDMA LAB)
GRASS SOD NOTE:
GRASS SOD SHALL BE EITHER HYBRID BERMUDIA MASS OR CENTIPEDE THAT WAS BEEN GROWN IN A SOIL
THAT I5 FREE OF AN IMPERMEABLE LAYER (SUCH AS CLAY),
BIO--RETENTION SOIL MIXTURE:
Bio-retention Soil Mixture (BSM): shot be placed and graded using low ground--contoct pressure equipment or by excavators and/or bockhoes
operating on the ground adjacent to the bio-retention facility. No heavy equipment shall be used within the perimeter of the bio-retention
facility before, during, or after the placement of the BSM. The BSM shah be placed in horizontal layers not to exceed 12 inches for the
entire area of the bio-retention facility. The 9SM shall be compacted by saturating the entire area of the bio-retention facility after each
lift of BSM is placed until water flows from the under -drain. Water for saturation shall be applied by spraying or sprinkling. M appropriate
sediment control device shall be used to treat any sediment -laden water discharged from the under -drain. V the BSM becomes
contaminated during the constriction of the facility, the contaminated material shall be removed and replaced with uncontaminated material at
no additional cost to the Administration. Final grading of the BSM shall be performed after a 24-hour settling period. Final elevations shall
be within 2 inches of elevations shown on the Contract Plans.
The Bia-retention Sal Mixture (BSM) shall be a uniform mix, free of stones, stumps, roots or other similar objects larger than two inches.
No other materials or substances shall be mixed or dumped within the bio-retention area that may be harmful to plant growth, or prove a
hindrance to the planting or maintenance operations.
Prior to placing the under -drain and the BSM, the bottom of the excavation shall be roto-tilled to a minimum depth of 6 inches to alleviate
any compaction of the facility bottom. Any substitute method for roto-tilling must be approved by the Engineer prior to use. Any ponded
water shall be removed from the bottom of the facility and the sal shall be friable before rota -tiling.
Once the BSM has been placed the entire bio-retention area shall be sodded with gross that has been grown in sandy soils or that has the
roots washed clean of any day or other materials that could clog the function of the bio-retention system.
OPERATION AND MAINTENANCE
North Carolina storm water rules require annual inspections by the regulating agency of trio -retention areas as a minimum. More frequent
inspections by the land owner or system operator are strongly encouraged to ensure the proper operation of bio-retention areas.
A. Rainfall Event
1. inspect the basin otter every runoff -producing rainfall event
B. Monthly Inspection
1. Inspect the basin monthly
2. Check the bio-retention area side slopes; remove trash and repair eroded areas before the next rainfall event
3. Check the vegetative and rock filters for sediment accumulation, erosion and proper operation of the flow spreader
mechanism and repair as necessary.
C. Quarterly Inspection
1. Inspect the collection system (i.e. catch basin, pipes and grass swales) for proper functioning. Clear accumulated trash from
basin grates and basin bottoms. Check piping for obstructions.
2. Check pond inlet pipes for undercutting, replace rip -rap and repair broken pipes.
3. Reseed grossed swoles, including the vegetated fitter 4 applicable, twice a year as necessary. Repair eroded areas
immediately.
D. Six Month Inspection
1. Remove accumulated sediment from the bottom of the outlet structure or other areas where accumulated sediment is noted.
2. Inspect the embankment taking note of any wet areas where water may be seeping through the soil.
E. General inspection
1. Maximum gross height is to be bin.
2. No woody vegetation shall be allowed to grow in the bio-retention area.
3. Debris shall be removed from blacking the inlet and outlet structures and from areas of potential clogging.
4. Periodic removal of dead vegetation shall be accomplished.
5. All components of the bio-retention system must be kept in good working order.
e ogo
CLEANOUT WITH THREADED LID
(TOP TO BE 6' ABOVE MAXIMUM
PONDING ELEVATION, AT 100
FELT MAX. HORTZ SPACING)
A
TOP OF EMBV#09X1REFEH
TO CHART FOR ELE1rATKIN
6' DIAMETER SOLID WALL UNDERDRNN PIPE
OUTLET- PVC (PER AASHTO M252) OR HOPE
WITH SMOOTH INNER MULL, PROTECTED WITH
FILTER fAW.
PLAN VIED
SPILLWAY CREST TOP OF EMBANKMENT ELEV = 631.0
ELEV.=630.0
1 I 3' I
CLEANOUT W9H THREADED LID
(TOP TO BE 6' ABOVE MAXIMUM
PONDING ELLVATION, AT 1 DO
FEET MAX. HORIZ. SPACING)
6' SCHEDULE 40 PVC, SDR35, OR SMOOTH
WALL CORRUGATED PLASM PIPE WITH 3/8'
PERFERATIONS @ 6' ON CEMER (4 HOLES
PER ROW)
OVERFLOW OUTLET SPILLWAY.
REFER TO CW1RT & DETAIL FOR SPILLWAY
ELEVATIONS & DIMENSIONS
UNDERMAIN PIPE EXTENDS TO 114VERTED
PIPE ELBOW. REFER TO GRADING PLAN
FOR LOCATION
SPILLWAY
A
B
BASIN
2 FT
1.0 FT
2'-4'
CONCRETE SECTION
2' A 2' TOP OF
EMBANKMENT
ELEV=631.0
B SPILLWAY
ELEV=630.0 -
2'-0'
- 1
5' THICK 4000 PSI
CONC. W/ 6X6, 10/14
WWF 2• FROM TOP
8"
CLASS B
RIP -RAP d 50 MEDIAN
CONCRETE SPILLWAY DIA.=s• 4N FILTER
FABRIC
REMOVABLE COP
1300"1 Ina MIN
LF,;iC2*1111XTJ;l
w
6' SCHEDULE 40M.
3CY CLASS B RIP -RAP
8' GRAVEL LA
6' UNDER -DRAIN PIPE
NOTES:
1. ALL B10-RETENTION SHALL HAVE AN ACCESS EASEMENT
CONNECTING TO A DEDICATED PUBLIC WHY OF WAY.
2. ALL DRAINAGE AREAS TO A BOO -RETENTION FACILITY ARE
TO BE STABILIZED PRIOR TO INSTALLATION Of SOILS OR
GRASS SOD,
3. WRAP PERFORATED UNDERDRAIN WITH FILTER FABRIC
PRIOR TO EIACKFI.LIWI
4. UNDU MIN PIPE SHOULD HAVE 3/8' PERFORATIONS
SPACED AT 6' CEMERS, MIN. 4 HOLES PER ROW. MAX
SPAM OF UNDERDRAIN PIPE IS 10 FEET ON CENTER.
5. UND13MAIN CLEA NOUTS MUST EXTIM A MIN. OF 6
INCHES ABOVE TOP SURFACE OF WASS IAYEK
PREFERABLY TO THE TOP OF DESIGN MAXIMUM PONDING
DEPTH IN THE BID -RETENTION BASIN.
TION = 631.0
50 YEM STORM ELEVATION = 630.97 _
10 YEAR STORM ELEVATION = 630.66
1 YEAR STORM ELEVATION = 630.10
SPILLMUY ELEVATION = 63D.0
1' STORM ELEVATION = 629.22
FILTER BLED ELEVATION = 529.0
WS LAYER ELEVATION = 627.0
BOTTOM OF SOIL MIXTURE = 626.0
BI0-RETENTION DETAILS BIO-RETENTION CONTROL STRUCTURE SEASO01AL HIGH WATER TARE > 31 FEET DEEP (596t)
�. N.T.s.
SOD ON SIDE SLOPES (REO'D
FOR FIRST PLANTING YEAR)
SCARIFY NATIVE SOIL
NO COMPACTION
OVERFLOW OUTLET SPILLWAY. REFER TO CHART FOR
REFER TO CHART FOR TOP OF BERM ELEVATION
SPILLWAY ELEVATIONS NY
DINEN5M
GRASS SOD
(BERMUDA SOD)
REFER TO CHART FOR 12' WON PONDING
r BOTTOM ELEVATION
- _ --- ---10' MIN - 3FT MINIMUM
BIORETENTION SOIL DEPTH (GRASS BASIN)
BIORETENTION SOIL MIXTURE
�- FILTER FABRIC AROUND
UNDE6' DIAMETER PERFORATED UNDERDRAIN PIPE 8" UNDER -DRAIN GRAVEL (TOP, BOTTOM
GRAVES BED
- PVC (PER AASHTO M252) OR HOPE WITH BED (#57 WASHED ��, BOTTOM AND SIDES,
SMOOTH INNER WALL, PROTECTED WITH FILTER SW) )
FABRIC.
SECTION A-AVNOTE: 6' UNDERDRAIN PIPE EXTENDS TO
OUTLET ELBOW. REFER TO GRADING PLAN dr
DETAIL FOR LOCATION & ELEVATION.
BI0-RETENTION CROSS-SECTION
OU" EWOW OU`I'LE`I' CONTROL
BIO-RETENTION PIM VIEW
GRAPHIC SCALE: 1 INCH = 20 FEET
F
TOP OF EMBANKMENT ELEVATION = 631.0
FILTER BED ELEVATION=-629.0
INS LAYER ELEVATION = 627.0 (BOTTOM OF ELBOW)
2 CY CLASS 1 RIP -RAP
SPLASH AREA OVER
FILTER FABRIC
90' ELBOW
INN=625.55
TRIANGLE
SITE DESIGN
CONSULTANT:
TRIANGLE SITE DESIGN, PLLC
4006 BARRETT DR, STE 203
RALEIGH, NC 27609
[phone]
LICENSE JP-0619
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OWNER/DEIIELOPER:
AUTOZONE DEVELOPMENT CORP.
ATTN. WADE DAMS
123 S. FRONT STREET
3RD FLOOR
MEMPHIS, TN 38103-2107
PHONE: [phone]
FAX: [phone]
wade.davisfttozonexom
For Md&V & Calttlractor In#alraAm Contact
F.W. Dodge Plan Room Tel: [phone]
REVISIONS:
girth :.'Aro1s�.
45
LAYOUT COORD: MEL
PLANNING MGR. MEL
DRAWING BY: MEL
DATE: JANUARY 23, 2012
JOB NUMBER: 010028
TITLE:
CONSTRUCTION
DETAILS
SHEET NUMBER:
C1.5
r 7 7- .= ill STD ?, ?f j I