SW4120101_APPROVED PLANS_20120212

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW_eAD���
DOC TYPE
El CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
DOC DATE
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BENCHMARK IS AN ASHEBORO CITY MONUMENT
.. 2 0 ' #81 SOUTHWEST CORNER OF SUNSET AND PARK
ELEVATION : 831.28
GRID: N=712787.327
E=1756336.796
EROSION & SEDIMENTATION CONTROL PLAN
SCALE: 1" = 20'_0„
THIS PLAN COVERS STORM WATER
TREATMENT ONLY
SALISBUR STREET
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LOCATION MAP
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REV. DATE DESCRIPTION
NO.
SITE LEGEND 1 1.04:12 RLEVISED OWERED Fl TER BER�ER
2 2.20.12 ADD APRON & 1L RAMPS
New Contours 9 =819
Existing Contours
Spot elevations I.E. 473.9 + STAMP
Storm sewer main / lateral 1511 PVIC
W
Silt Fence
0- Limit of Disturbance Line
Property Line
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- Sanitary sewer main / lateral
OWater main / lateral
0 Gas main / lateral G
0 Underground e tectr i s service lJG/ E Z
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LLJ Underground Telephone service UG/T
PARKING FRONT YARD SET- J
LANDSCAPE BACK LANDSCAPE a U
AREA=,>1 F2 sf AREA U _o Z
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6' FENCE
BUFFER -SCREEN B BUFFER --SCREEN B FENCE
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Subject parcel is' Tract #2 Deed Book 2062 page 1646 & 1648 —� p �
Parcel is Owned by Cornerstone Triad Realty, LLC: Pin # 7751622601 h
Total Site Area is 1.42 aches 0 N
Supporting boundary & topographic survey information LLJ
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shown was prepared by William Burrow: PLS L-2497 z
Boundary information from Survey dated Nov. 12, 2010 Project 3926 Q Q O
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SEQUENCE OF CONSTRUCTIOri
1. Verify that the owner has an erosion control permit. Obtain a copy prior to beginning work and post a
copy on site.
2. Schedule a pre —construction meeting with owner, contractor and al affected utility companies.
3. Stake limits of construction/disturbance.
4. Install stabilized temporary construction entrance.
5. Install sediment trap as well as temporary diversion ditches that fl(w into sediment trap.
Bottom elevation of sediment trap to be 811,0.
6. Begin major grading operation.
7. Grade channels #1 & ##2 to the temp diversion berms and install clannel liner in both channels.
8. Install remainder of erosion control devices.
9. Begin major grading operation.
10. Install stone on drive/parking area as soon as design grade is ob ained.
11. After all site construction is complete including paving, contractor to install Sand Filter
Contractor to ensure no sediment from construction enters filter d any time.
Contact engineer prior to installing stone for inspection.
12. Maintain & clean all erosion control devices throughout duration o" project.
13. Slopes left exposed and all other areas disturbed during this proje:t should have ground cover
sufficient to restrain erosion within 21 calendar days following comlletion of any phase of grading, and
within 15 working days or 90 calendar days, whichever period is sh)rter, following completion of
construction. Provisions for permanent ground cover sufficient to rfstrain erosion must be accompanied
for all disturbed areas within 15 working days or 90 cal•endar days, whichever is shorter, following
completion of construction,
Notes: 1. Any off site borrow or waste area must be approved by NCIIE&NR before beginning construction.
2. Temp. sediment traps and temp. diversion berms to remain until entire site is stabilized.
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KEY PLAN
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CHECKED BRL
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TITLE
OVEALL GRADING
PLAN & SAND
FILTER LOCATION
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10 SQ FT OF CLASS
�- -- RIP -RAP 12" DEEP
RIP RAP FILTER BERM NCDOT - CLASS
'S' RIP RAP 12" DEEP W/ 6" #57 STONE
ON THE UP STREAM FACE. TOP OF FILTER
BERM ELEV. = 813.50 LINE BASE OF RIP
RAP W/ FILTER FABRIC, FILTER BERM TO
BE KEYED IN 1 FT BELOW GRADE
W.L. 813.50
�'� SAND FILTER SITE PLAN
C31C3SCALE: 1" = 10'-0"
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TOP BERM
EL 815.00
EMERGENCY
SPILLWAY
i-EL 814.50
TOP RIP RAP o ¢ PVC CLEAN OUT
2 0 EL 813.50 ri ]wC TOP SAND
W.L. 813.50 EL. 810.50
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UNDISTURBED EARTH OR-/
6" SCH 40 PVC COMPACTED TO 95X PROCTOR
12" -r
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12" DEEP CLASS "B" RIP -RAP
SEE DETAIL BELOW
4'
CLASS "B" RIP -RAP BERM
NOT TO. SCALE
THIS PLAN COVERS STORM WATER
TREATMENT ONLY
BEFORE YOU DIG I
CALL 1-800-632-4949
N.C. ONE -CALL CENTER
IT'S THE LAW !
BOTTOM SEDIMENTATION
MAINTENANCE NOTE:.-
CHAMBER EL. B10.50
4" SCH 40 PVC (SLOTTED)
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BOTTOM SAND FILTER
1. ANY DEBRIS MUST BE REMOVED FROM THE FACE OF THE RIP -RAP GRAVEL BERM
CLASS 'B'
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CHAMBER EL 808.50
MONTHLY. REMOVE ANY DEBRIS FROM THE SURROUNDING AREAS THAT COULD ENTER
RIP -RAP BERM
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EITHER CHAMBER OF THE SAND FILTER.
ONE LAYER TEXTILE FABRIC, GEOTEX 117F-WOVEN MONOFILAMENT
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GEO-TEXTILE XTELE 0R APPROVED EQUIVALENT BETWEEN GRAVEL AND SAND
2. GRASS MUST BE MOWED REGULARLY TO MAINTAIN A GRASS HEIGHT BETWEEN 3"-6".
NOTE: COMPACTION MUST BE
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AND GRAVEL AND EARTHEN BOTTOM OF FILTER CHAMBER
GRASS CLIPPINGS MUST BE BAGGED AND NOT BE ALLOWED TO COLLECT ON THE SAND
95% STANDARD PROCTOR FOR FILL
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3" GRAVEL BED UNDERDRAIN AROUND
FILTER'
PIPE, #8 OR 89 STONE
3. ANY ERODED AREAS AROUND THE FILTER ARE TO BE REPAIRED IMMEDIATELY TO
PREVENT ANY SILT FROM ENTERING THE FILTER.
SAND
FILTER FOR
DRAINAGE BASIN 1
4. AS PART OF MONTHLY MAINTENANCE, REMOVE .ANY DEBRIS AROUND ANY CATCH BASIN
OR PIPE INLET TO PREVENT ENTRANCE INTO THE DRAINAGE NETWORK. REMOVE ANY DEBRIS
FROM PERMANENT EROSION MEASURES SUCH AS IHE ROCK CHECK FILTER DAM AT THE
SECTION
DETAIL
PIPE INLET.
NOT TO
SCALE
ENGINEER'S STATEMENT OF RUNOFF CONTROL
state that, to the best of my knowledge and belief, this plan will control both the runoff
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from a one inch rainfall from all built -upon areas over the total drainage area and the
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difference in runoff volume between pre and post development conditions over the total
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drainage area for a 1 year/24 hour storm event.
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SIGNATURE
DATE
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P.E. SEAL
SAND FILTER RESPONSIBILITY NOTES
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The property owner is responsible for maintaining the completed permanent sand
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filter as directed by the governmental office having jurisdiction for watershed protection:
The permanent sand filter shall have full design volume available prior to any issuance
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of certificates of occupancy for the site and/or prior to any plat recordation for the site.
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This may require the cleanout and disposal of sediment from the device.
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The government office having jurisdiction for watershed protection and their assigns have
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right of access to the permanent sand filter for inspections and maintenance enforcement.
Final approval of installed runoff control structures will be required at finalization of the
grading permit <or at issuance of the final building certificate of occupancy (compliance),
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whichever comes later. If neither a building permit nor a grading permit is required for a site,
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then any required runoff control structure shall be substantially completed prior to installation
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of any built -upon area on the site. Engineering certification of completion shall be required
prior to final approval by the Enforcement Officer.
REV. DATE DESCRIPTION
NO.
1 1.04.12
REVISED SANDFILTER
2 2.20.12 LOWERED FILTER BERM
OPERATIONS AND MAINTENANCE MANUAL
WATERSHED PROTECTION SAND FILTER DEVICE
STAMP
OPERATION OF SAND FILTER
Sand filters satisfy the State's minimum requirements of 85% removal of Total Suspended Solids.
The sand filter design is comprised of two basic components: the sediment chamber and the sand
chamber. Both are important parts of the design, and neither can be omitted. The purpose of the
sediment chamber is to reduce the amount of sediment that reaches the sand chamber and to
help ensure that stormwater reaches the sand chamber as sheet flow. The purpose of the sand
chamber is to trap the finer sediment along with pollutants attached to the sediment, and to provide
a media for microbial removal of bacteria.
Sand filters work by receiving the first flush of runoff and settling out the heavier sediment in the
sediment chamber. Water then flows to the sand bed in sheet flow where pollutants are either
trapped or strained out. Sand filters are to be used only for drainage areas that have been
stabilized. Sediment from construction activity can quickly clog the sand filter, thereby reducing the
required size of the filter. Drainage areas directed to each sand filter should be kept below 5 acres
in size. Larger drainage areas area less likely to be entirely impervious and it is more difficult to
distribute the flow of runoff across the sand bed.
Sand filter drain pipes should always be operable so that the water can be drawn down in the event
of severe rain or for repairs or maintenance.
MAINTENANCE OF SAND FILTER
The Installation of a sand filter can required substantial routine and non -routine maintenance.
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Debris and sediment can effectively plug a sand filter and prevent it from completing its intended
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function.
Weekly policing of teh filter chambers adn the drainage area contributing to the basin must
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be done
to prevent premature clogging. Careful attention must be paid to eliminating or preventing
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sources
of sediment (i.e. unstable bare earth areas, sanding~ parking areas during winter, etc.}
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Maintenance operations must be performed ' when storms of approximately one inch are not passing
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through
the filter within 24 hours. The filter material surface must be inspected regularly to ensure
that the
material has not become clogged with debris (or pollutants) and has not been compacted or
"crusted
become
over" so as to prevent the free flow of water. Maintenance for sand filters consists
of removing the first two or three inches of discolored sand and the replacing this with new sand. At U
the same time that maintenance is performed on the sand chamber, the sediment chamber should be z
pumped and cleared.
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Spillway structures and pipes including the filter drain must be inspected regularly (at least once a Of r,
year) to ensure there is no blockage or structural damage. O N
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Filter basin repairs and maintenance will require a professional engineer to prepare a plan or detail Z
and certify the completion of the repairs. ry
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SAND FILTER SPECIFICATIONS U 00
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Sand used in the sand filter chamber must be either NCDOT Standard Size 2S or ASTM C-33. P +d�.,� w z Q
Compaction must be 95% standard proctor for fill areas. -moo PL Q CW)
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All slopes for sedimentation chamber and sand filter chamber must be 3:!. � Q cn O LLJ
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Drain pipes in bottom of sand filter chamber should have screen covered with filter fabric on '•.yd, C'�.•' U :2exposed ends to prevent pipe from becoming clogged. '�., 0H .�' - LJ O
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SEQUENCE OF CONSTRUCTION - SAND FILTER # 1 � N W }--- (D =
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1. CONTRACTOR TO ENSURE EROSION CONTROL PERMIT HAS BEEN OBTAINED flT Z U O
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2. CLEAR AND GRUB SITE AS REQUIRED. SW ,CU 0 _J �p
3. INSTALL SILT FENCE BELOW TOE OF DAM TO PREVENT ANY SILT FROM LEAVING THE PROPERTY. �� `� N
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4. EXCAVATE SAND FILTER TO DESIGNED GRADES. 4Zi C OLd
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5. INSTALL UNDER DRAIN SYSTEM. '
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6. SHAPE SAND FILTER EMBANKMENTS AND DIVERSION CHANNELS AS PER PLAN.
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7. ONCE FINAL GRADE IS OBTAINED, CONTRACTOR TO OBTAIN AS -BUILT OF SAND FILTER FOR ENGINEER TO CERTIFYTHATTHE DESIRED SURFACE V) N p KEY PLAN
AREA, VOLUME AND ELEVATIONS OF ALL STRUCTURES HAVE BEEN OBTAINED PRIOR TO SEEDING AND MULCHING EMBANKMENTS. , p
8. EXTEND STORM DRAIN FROM STREET TO POND AND INSTALL RIP RAP OUTLET PROTECTION AND CHANNELS FROM PIPE OUTLETTO SAND
SURFACE. SHOULD SLOPES CHANGE IN FIELD DUE TO FILL CONDITIONS, NOTIFY ENGINEER IMMEDIATELY DUE TO THE NATURE OF RUNOFF j.��
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ENTERING SAND FILTER. HIGH VELOCITIES WILL ERODE SAND FILTER ANDTHIS MUST BE AVOIDED.
9. INSTALL FILTER FOREBAY.
10. SEED AND STABILIZE SLOPES WITHIN ONE WEEK OF COMPLETION OF POND. INSTALL CHANNEL LINERS IMMEDIATELY. 0 -c
11. CONTRACTOR TO CLEAN OUT ANY SEDIMENT THAT MAY ACCUMULATE AFTER A STORM EVENT DURING POND CONSTRUCTION. ALL �MN
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SEDIMENT IS TO BE REMOVED PRIOR TO PLACING POND INTO OPERATION. KIN 1101
JOB NO.
12. NOTIFY ENGINEER FOR FINAL INSPECTION. 0 DRAWN NK/JP
13. ONCE SAND FILTER AND ALL DISTURBED AREAS ARE STABILIZED, EROSION CONTROL MEASURES MAY BE REMOVED. V DAECKEi1 BRA
`�~-� �' DATA 6-08-'11
14. ANY DEVIATION FROM THE APPROVED PLANS ARE TO BE APPROVED BY THE ENGINEER AND IICDENR-WETLANDS UNIT PRIOR TO THE WORK TITLE
BEING PERFORMED.
SAD FILTER
PLAN
& DETAILS
SHEET N0. C
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- - - - - --- . -- - 777- s -
1 INCH