20070996 Ver 1_Site Plan_20071113

SPECIAL CONDITIONS:
This Stabilization Plan addresses certain specific conditions , ASTER THE FACT STABILIZATION PLAN
and features-of-work. All existing features-of-work were Establish groundcover on all distrubed areas. Grou Ground cover NARRATIVE & BACKGROUND IMPOUNDMENTS
designed by others. The conditions that have resulted in shall be established on exposed slopes within 7 cal z i 7 calendar ~ This Plan is prepared "after the fact" and is intended to st FEATURE PERIMETER AREA and mitigote the existing disturbances outlined in the Notice PRELIMINARY
day days following completion of any phase of gra the issuance of the "Notice of Violations " b the of grading and r to stabilize NOT FOR Notice of
y permanent ground cover shall be established on all NCDENR-DWQ occurred prior to the preparation of this Plan. disturbed areas within 14 calendar days following c By accepting this Plan, you and any others to whom it is of each respective phase of construction. on all W Upper Pond 313 FT 5.438 SF (0.13 AC) Violation (NOV) dated April 26, 2007 issued by the NCDENR ;DEN R CONSTRUCTION Water
distributed, agree to a strict limitation of liability for Terry wing completion ~ Accumulation of off-site sedimentation at confluence of a Quality Division, Asheville Regional Office. All existing featur ce of Lower Pond 425 FT 6,969 SF (0.17 AC) work. including the house site, driveway, and earthen dams, features of
E: Allen PE, T.E. ALLEN ENGINEERING, P.C., and its streams on adjacent property. Area of sediment measur ° approximately 28'x28'x1.5'. Sediment to be removed by neasures designed by others. The disturbances included the construc ~d by two earthen dams on an unnamed tributary to the Horsepas ambed Total Disturbed Area N 0.75 Acres River, class c-trout waters of the State. The stream has b Jams, were
employees to an amount not to exceed the fee paid in nstruction of FOR irsepasture PERMITTING
hand. ~ hand means only (no mechanical equipment). Streambed has been
~ Q and streambank to be stabilized after sediment removal. ~ see Detail 3 on this sheet. Contractor shall obtain Koval. Trout Buffer Zone Disturbance = 350 LF impounded at two locations and some off-site sedimentation ntation has ONLY
i Unnamed tributary to the Horsepasture "Right-of-Entry" from adjacent Property Owner prior to o beginning work. Total Steam Impact = 485 LF occurred. A trout buffer zone disturbance exceeding ten pe >r to Spillway Pipe Material = HDPE of the total length of the buffer zone within the tract has ten percent
River, class c-trout waters of the Spillway Pipe Diameter = 24" occurred without u variance. Permits were not obtained prio has ed prior to
State. a Depth pipe will be buried below grade =varies (10 FT max) beginning work. N
Pipe Slope = 3~ This Plan includes sedimentation and erosion control measur Length of Step-Pool dissipater = 30 Ft minimum improvements to the existing earthen dams to address dam
~ ~ Falls New Silt Fence, typical. ieasures and 00
See Detail 3 on Sheet C-2. APPROX. issues. The total disturbed area is not expected to exceed DAM IMPROVEMENT SPECIFICATIONS acres. The trout buffer zone disturbance is approximately 3 linear feet. The total length of stream impacts (i.e., trout 1.0 DAM EMBANKMENT disturbance plus off-site sedimentation) is approximately 48 linear feet. This Plan along with the respective permit oppli 1.1 The upstream embankment shall be constructed at a will be submitted to the applicable permitting agencies. 3 dam safety xceed 0.75 a~
HOUSE LOCATION New Stone Check Dam (Berm), typical. s~ itely 350
Stone Construction Entrance, See Detail 2 on Sheet C-2. ~~'~9 Q trout buffer z E
see Detail 1 on Sheet C-2 ~ ~I y 485 0 ~ U
25 FT. TROUT WATER ro applications O
BUFFER ZONE slope no steeper the 2 horizontal to 1 vertical. The r"10000 M
downstream embankment shall be constructed on a slope No work shall begin until all required permits have been obta v 00 00 n obtained. C
~ 3i ~Y?t ~i££ ~?II ~2}i e FIJI ~}e? ~Fi Y~ IIe ie? ~i33 e£ ! ~ C g~ no steeper than 3 horizontal to 1 vertical. This will require These permits may include. but are not limited to Section 4 adding additional fill to both sides of the dam for the and/or Section 10 Nationwide, Regional and General Permits; tion 404 = I I
~~E entire length of the dam. The material that presently Section 401 General Water Quality Certifications, and Riparian arm its; (f r.., i~
comprises the dam is considered suitable for use as fill for Buffer and Watershed Buffer Rules; and Sedimentation & Ero the semi-pervious zones. If this material is no longer Control Permit (including a Variance for Trout Buffer Zone i parian W 0 00 00 O -
J ~ & Erosion Z one 00 00
EXISTING ORIVEW Y . ~ Q~ 25 FT. TROUT WATER available, proposed fill material should be identified and Requirements). x z c~ N
EXI TING D EWAY BUFFER ZONE A subjected to laboratory testing under the direction of the Engineer. (,jwmD o Q 00 00 M =
• New Step Pool, typical. z V)
~ . ~ ~ See Detail 4 on Sheet C-1. GENERAL NOTES: 2.0 SITE PREPARATION 0o Q
i 1. No work to be undertaken within streams or buffers betwe 2.1 Extending the slope of the dam will require adequate October 15th and April 15th or as otherwise specified by the W Q- ry LiL between
•ff ~i~: / ~fi5 ~ ~ ~ ~ Existing Water Wheel (designed by others). site preparation and placement of fill. All existing NCDENR or NC Fish & Wildlife. :)y the
t: vegetation shall be removed from the dam slopes prior to V r
~i ~ ~ ~ ! !$i?i FI£ ii7 :ii i ~JIi ~}ft ~is~ £f£ ~fi) i£t fir New Principle Spillway. See Detail 2 on Sheet C-1. placing new III. The toe of slope for the upst~eom and 2. The features of work described in this Stream Stabilization w '
1 UPPER downstream embankments should be extended as necessary are intended to address certain concerns with the original wo to achieve gradients of 2H:1V and 3H:1V respectively. Any within the stream and buffer zones. The Erosion & Sedimen existing alluvial soils at the ground surface in the areas Control features shown herein are applicable to mitigation wa between the toes of slopes to a distance of no less than 3 only. The total disturbed area for the work addressed in thi feet should be undercut to the extent that they exist. In is not to exceed 0.75 acres. All existing features of work w addition, the existing dam embankment fill should be designed by others. lization Plan W W Z in al work -
. _ 4.13 A~~ Existing Earthen Dam (designed by others), .1dimentation z
5 FT. OUT ~ ATER 7' ~ AC!( ~ ~ BA ~E 25' to be improved, see Details 1 & 2, Sheet C-1. ion work W
~ ~ j B FFER ~ ON p,GE ~ FS in this plan C~
vork were z
Accumulation of off-site sedimentation in and along strea on adjacent property. Sediment to be removed by hand stream removed 2 feet into the slopes, on the upstream and I- 17 • i
lsO means only (no mechanical equipment). Streambed and hand downstream sides of the dam, with the excavation extended 3. All work shall be in accordance with the North Carolina and downward in order to remove any alluvial soils in these Sedimentation Pollution Control Act as amended, North Caroli see areas. After any suspect material is removed, the EngineEr General Statutes Chapter 113A Article 4. North Carolina ina W
streambank to be stabilized after sediment removal see Carolina Z
Detail 3 on this sheet. Contractor shall obtain should evaluate the newly exposed soils in order to confirm Administrative Code Title 15A. Chapter 4, and all other applic to the structural suitability. codes, ordinances, regulations, and requirements. The Contro shall obtain all required permits prior to beginning work. This o U
5~~ "Right-of-Entry" from adjacent Property Owner prior to applicable Contractor
beginning work. 2.2 After the Engineer has approved the subgrade for fill shall be adjusted as necessary to prevent offsite sedimentati placement, the entire subgrade should be covered with a This plan
~entation.
geogrid equivalent to Mirofi BXG 11. This includes the 4. Site Description. The site has a steep sloping topograph bottom of the excavation and the vertical slopes created by The site is mostly covered with volunteer heavy, woody vegeta
)grophy vegetation.
the excavation. The initial lift of fill shall be placed over . .
ine geogna. ~ v
5. Adjacent Property. Land use in the vicinity is residential. iential. The
BAG SHEEP CUFF R~Ap property in located in Big Sheep Cliff Subdivision. Cashiers, Ja 3.0 FILL PLACEMENT County, NC. srs, Jackson O v,( Q) 4
~r~ HWY 107) Q~ P~ ~~~ry~~~~ . MR. MANUEL DEJUAN RESIDENCE Top-of-Dam 3.1 After proper site preparations, fill should be placed 6. All topographic and boundary information was provided bt led bt U
within the excavations made to remove alluvial soils first, survey entitled "Lots 7&8, Big Sheep Cliff Subdivision". dated returning these areas to the surrounding ground levels. The 4-13-2007 by L. Stephen Foster, PLS. Verify all topos and dated
Principle Spillway upstream dam slope should have a bench (terrace) cut into routes in field prior to construction and ordering of materials. > and
Spillway pipe for Water Wheel it at mid-height of the slope. It should be cut into the terials. n ,
P.O. BOX' 2908 - - - - Water Wheel slope at least 3 feet in the horizontal direction. This is, 7. Contractor shall verify and protect all underground utilities ~r
CASHIERS, NC 28717 necessary to minimize the potential of treating a slip plane prior to beginning work. Utilities ~
~4~u~~~ ~~e,•-, cJ-+a,,,,e~ •g ~q ~1 ,b~ 828743-1021 i ~ Existing ~ , between the existing and newly placed fill.
828-342-8498 Earthen ~ ~ 8. Ground cover shall be established on exposed slopes withi 3.1 Any soils deleterious materials, such as organics or calendar day days following completion of any phase of gradin topsoil should not be used as fill for the dam. All fill that and permanent ground cover shall be established on all distur is placed within the dam shall be compacted to a minimum areas within 14 calendar days following completion of each s within 7
LOTS 7 & 8 BIG SHEEP CLIFF SUBDIVISION Dam ~ ~ ~ grading
~ q~-~`hO^ 50~~ w~t,~ CASHIERS, JACKSON COUNTY ~ disturbed ~•y Bch
NORTH CAROLINA of 959 of the soils maximum dry density as determined by respective phase of construction. _ the Standard Proctor Test, ASTM D 698. All fill should be w 4=o
NOTE: placed in 6-inch loose lifts prior to compaction. The 9. This Plan shall be revised and adjusted as necessary to
SOT 7 PIN 7572-24-1983 moisture content of all fill at the time of placement should prevent off site sedimentation and to prevent increased turbid be within plus or minus 2~ of the soils optimum moisture streams and surface waters. The turbidity of surface water sh content. Once fill placement begins, field density tests not exceed background (preconstruction) levels at any time d should be performed by a qualified soils technician to development. Erosion control features shall be installed prior y to ~ • r-+ O
LOT 8 PIN 7572-25-1144 1. The Dam Section for the Upper Pond is similar, but without the water wheel. turbidity in iter shall
ime during
2. Contractor & Owner reported that the existing dams determine the degree of compaction being obtained in the beginning other land disturbing activities. prior to
were constructed with a compacted clay core. field.
A SITE PLAN - AFTER THE FACT STABILIZ ~-1 = 50' 31LIZATION PLAN 3. All existing features of work were designed by others.
3.3 It is important that the fill not be compacted at the 10. All erosion control features shall be constructed in accord same level across the entire cross section of the dam. ' It with the applicable details on this Sheet and Sheet C-2. accordance vL ~ O
is important to place adjacent lifts at different heights A 25 foot undisturbed buffer zone is required around all trout
through the cross section in order to help prevent creating waters. trout
a continuous seam within the dam from the upstream side F U
to the downstream side that could provide a fissure for the
7 EXISTING DAM SECTION - LOWER POND 4 4X impounded water to travel through. '
C-1Design ed by 0th ers)
Not to Scale
Trash Guard
NOTES
Principle Spillway Riser -Bottom Draw Type to mi Outer riser temperature fluctuations in accordance with 15A N to minimize 1. No work shall be undertaken within Accumulation of off-site sedime Culvert Outfall
(d3+2') .0211 15A NCAC 26 streams or buffers between October at confluence of streams on a 15th and April 15th or as otherwise property. Area of sediment me Dam specified by the NCDENR or NC Fish & approximately 28'x28'x1.5'. Sedi wildlife. be removed by hand means onl :xisting top-draw spillway to remain and serve and sedimentation s on ad'acent 00
1 STEP POOL DIMENSIONS ant measures
UD Slide Gate Top-of Dam Sediment to Minimurr~ Length - 30 Ft
(bottom drain) Minimum Width .10 FT (or bankfutl width, whichever is greater) ns only (no C46
Existing 2. Streambed and streambank to be mechanical equipment). i
Top-of-Dom em erg e Emerg Spillway Invert- 2 emergency spillway. stabilized after sediment removal. W ~
Riser Rim Elev~- 1 i - - - - - - - - - - Culvert Outfoll 'e,
Existing Dam to be improved, 3. Contractor shall obtain Header Rock
o I I ~ ce~~ \oPe oownStr~ 3' 1 see DAM IMPROVEMENT SPECIFICATIONS Right-of-Entry from adjacent r~o~ Shope Property Owner prior to beginning work.
~ Qs'~ Spillway Inver~~ ;fit' w;~,,,;a.~• Y~` 1-2 bankfull widths O
(bottom-of-stream) d~ 4. The type and density of ~ , r.F•'. . S
d3 d2 reestablished vegetation shall match
adjacent undisturbed areas.
Principle Spillway Riser S Clay core (im (inner riser) Principle Spillway Pipe' ire (impervious) Existing
Anti-Seep Co Diameter of Outer riser NOTES: OFF-SITE SEDIMENTATION AT STREAM CONFL eep Collar Step Pool (TO BE REMOVED BY HAND) Footer Rock ~ stream bed CONFLUENCE Vertical Scale:
Well mixed on-site alluvium ~
to be d3+2ft Type 2 nonwoven filter fabric NONE
1.0 The earthen dams shall be improved as de DIMENSIONS 1.1 Install new principle spillway and step pool. Reestablish as described below: Reestablish indigenous aquatic stream bed. ~blish natural °
~ pool. All spillway piping to be Schedule 80 PVC zone, bank zone and shrub zone i bed. 1. No work to be undertaken with st~eoms or buffers between Horizontal Scale:
PARAMETER UPPER POND LOWER POND or HDPE. vegetation. Reestablished October 15th and April 15th or os otherwise specified by the NCDENR or NC Fish do ~Idlife.
H1 1.0 ft 1.0 ft 1.2 Provide additional fill on upstream and dow ~n ^ < A ' 1.3 Add fill as needed to achieve the specified id downstream slopes, vegetation in the shrub zone AS-NOTED
ecified freeboard above the spillway invert elevation. shnll t,P n~ ?,o+WOe., 2. Header and footer rock shall be sound, u~weathe~,
n/- L.D TL L.5 Tt riprap". The type and density of IIVoI II vNWI I.uI qwup ly luvus yi unite. neaver 4X Tooter roCK snali nave • overall dimensions of not le ss than 2'x31x61 and Issue Date:
D* 7.5 ft* 9.0 ft* 2.0 The Dam Section for the Upper Pond is si earthen dam at both the Upper Pond and the L J is similar, but without the water wheel. The reestablished vegetation shall shall not weigh less than 3 tons each.
d1 18 inches 18 inches herein. 1 the Lower Pond shall be improved as shown match adjacent undisturbed Bankfuil Width ` f --*10 FT Field Verif 5-30-2007
d2 24 inches 24 inches areas. STABILIZE STRE..MRED & STREAMBANK (HAND WORK ONLY) y IBANK
d3 36 inches 36 inches 2 IMPROVED DAM * -Field verify impoundment depth
~M SECTION (4X) 3 STEAMBANK STABILIZATION r4-%s TYP I C A L STEP POOL DETAIL NOT TO SCALE
~ - O Q O1 LP prior to ordering spillway pipe. C- ~ Not to Scale
C- ~ Not to Scale 0 to Scale
SHEET 1 OF 2

0 i
Construction Sequence PRELIMINARY
50' MINIMUM _ 1) Obtain plan approval and other opplicoble pem?its. 2) Install temporary grwet construction entrance. TOP ELEVATION OF STORMWATER 0.5-1' VARIABLE AS DIRECi ;5 WASHED _t~~' MAX. ~ ~ ~ Permanent Seeding Recommendations 1S DIRECiE~ BY THE ENgNEER I~; f { NOT FOR
3) Instill sediment basin and silt fence at the first STONE '1'~~ 'q ~~i.' 9 CONSTRUCTION
construction activity. DESIGN OF SPIL ~ "t: `u: 4) Constnact temporary diversions above proposed grading F_ SPILLWAYS ~ ~ { p~` ~ Seedin mixture
~ ~,i,~;,,'`.,' areas. Vegetate disturbed areas within 15 working days DRAINAGE AREA wEl • , ' ? ~ % or 30 calendar days, whichever is shorter. (ACRES) ~ EXISTING SLOPE MINIMUM 10 GAUGE NISTALLJED /1 WEIR LENG?H UNE WIRES .r ~,cE Fnsmc Species Rate (Ib/acre) ~E LL~ ~ COND MINIMUM 12-1/2 GAUGE Tall Fescue (Rebel II) rJ2
ExIS71NG~ S) Clear areas that are to be graded. ~ ~1 RIP-RAP HARE OM 4.0 YARI S INTERMEDIATE WIRES Tali Fescue (Falcon) 52 FOR
ROADWAY..~~ ~i' ~~.2-3' Coarse Aygregatd'' 12~ 2 6) Rough grade site. Construct rood beds and permanent 3 6.0 Kentucky Bluegrass (Adelphi) 13 PERMITTING
• channels. Install storm culverts, inlet do outlet protection, 4 8.0 ~~o SIDE VIEW a 13 Kentucky Bluegrass (Windsor) cR~ ONLY
"r w,.~ •~w ~ yV ~ ~ • • ` ' ~ • ~ and any remaining sediment traps and rxk check dams. 5
"~~r ~ 7) Complete rough grading and final grading. Complete ~ DIMENSIONS SHOWN AR ~ construction of gross-lined channel along rear property line. HOWN ARE MINIMUM . Seeding note & All work will be carried out by an approved spraying machine,
6" MIN THICKNESS 8) Hydroseed graded areas including bank cut. shoulders, EXISTING SLOPES e~N!4~~'~ ~~C~ specially used for this work. The contractor shall submit to the
and permanent diversions as soon as it is possible FRON VARIES ~ Landscape Architect for approval (prior to start of work) a FRONT VIEW ' I~ " 4'. certified statement as to number of pounds of fertilizer,amounts and N
PLAN VIEW in order to stabilize the site. 9) Install utilities. ~ t es of rass seed. and rocessed fiber per 100 allons of water. ~6;;' sl~~' I~ YP 9 P 9
10) Inspect all erosion & sediment control proctices per STEEL POST ~ . Nurse plants 00
maintenance specifications shown on plan. 11) Pave roads and paved permanent diversions. NOTE: HEIGHT do WIDTH DETERMINED BY VSE SILT FENCE ONLY WHEN DRAINAGE AREA MIOVEN MARE FABRIC ~ ~ r~ Between May 1 and Aug. 15, add 10 Ib/acre German millet or 15 Ib/acre N
12) After site is stcbilized, remove all temporary measures and 0.5'-1' EXISTING TOPOGRAPHY AND DOES NOT EXCEED 1/4 ACRE AND NEVER 1N ~ { ~ ! ~ li SILT FENCE FABRIC ~ ~ ~ Sudangrass. Prior to May 1 or after Aug. 15, add 40 Ib/acre rye. C
CONSTRUCTION SPECIFICATIONS install permanent vegetation on the disturbed areas. W ~ . s . ~ ~ SEDIMENT STORAGE REQUIRED. AREAS OF CONCENTRATED FLOW. i~,,`:~•,••.,.~::i KEYED RIP RAP ~ ~ ~ ~ ~ Seeding dates Best Possible E ! n Z
W l KEY RIP RAP INTO THE DAAA ~ FOR STABIUZAiION. ~ ~u s~oPe ; ~ Below 2500 ft.: Aug. 15 - Sept. 1 July 25 -Sept. 15 V ~ 0
1. Clear the entrance and exit area of all vegetation, roots, and other objectionable material and properly grade it. c~Erta. Notes a 4, • FOR REPAIR OF SILT . MUY. 1 - Apr. 1 Mar. 1 -May 10 USE No. 57 WASHED,' AbOVC 2500 ft.: July 25 -Aug. 15 July 15 -Sept. 30 elf p~ U
/5 WASHED STONE N n ~ , • WHEN SILT FENCE IS co co
2. Place the gravel to the specific grade and dimensions STONE F~2 CONSTRUCTION ENTRANCE SHALL BE 6" Mw shown on the plans and smooth it. TMicKNESS. CATCH BASIN. a i Mor. 20 -Apr. 20 Mar. 5 -May 15 s" MINIMUM COVER ~ ~ ' ~i Complete seeding earlier in fall, and start later in spring on north
2. FABRIC MAY BE ADDED UNDER THE STONE WHICH WOULD ADD FRONT VIEW OVER SKIRT • ~t~~; ~ ~9~,{~ ; and east facing slopes.
3. Provide drainage to carry water to a sediment trap or other ToTfu u~ ro n~E corosrnucnoN ~rnnNCE. suitable outlet. L= The distance such that points A & B are of equal elevation n°-' co 0 0 CO - 0 00
3. 1HIS ENTRANCE APPLIES ONLY TO ENTRANCES OF IN~VIOUAL SINGLE FAMILY RESI~ENTIAI UNITS. ei"r ~aN~T ~?s aa~cr~° ~~jit ~ Soil amendments • f' ; , .
4. Use geotextite fabrics because they improve stability of the foundation in locations subject to seepage or high water table. CONSTRUCTION SPECIFICATIONS Follow recommendations of soil tests or apply 4,000 lb/acre ground '^s agricultural limestone and 1,000 Ib/acre 5-10-10 fertilizer. N
L B MATERIALS Use a synthetic filter fabric or o pervious sheet of pol >PECIFICATIONS certified by the manufacturer or supplier as conforming SIDE VIEW 3},;P co 00
MAINTENANCE ` ~ ~ ; Mulch
Maintain the gravel pad in a condition to prevent mud or CONSTRUCTION SPECIFI sediment from leaving the Borrow site. This may require periodic of polypropylene, nylon polyester, or polyethylene ~ Apply 4,000 - 5000 Ib/acre grain strove .Anchor mulch by tackin with forming to the requirements shown in Table 6.62., ' asphalt roving, or netting. Netting is the preferred anchoring met~od Z po Q 0
filter fabric should contain ultraviolet ray inhibitors and on steep slopes. rs and stabilizers to provide a minimum of 6 Maintenance
topdressing with 2-inch stone. After each rainfall, inspect 1. Place stone to the lin any structure used to trap sediment and clean it out as the lines and dimensions shown in the plan on a filter fabric foundation. expected usable construction life at a temperature rong ?ne section at least 9 inches below natural ground level where the dam abuts Ensure that posts for sediment fences are of 1.33 Ib/l that steel posts have projections to facilitate fastening re range of 0 to 120 F. 'y it , C Do not mow crown vetch. Refertilize in the second year unless growth
necessary. Immediately remove all objectionable materials spilled. 2. Kee center stone se washed, or tracked into areas that may drain to the pond or off-site. P
the channel banks. 33 Ib/linear ft steel with a minimum length of y is fully adequate. Reseed, fertilize, and mulch damaged areas ~tening the fabric. For reinforcement of standar t , immediately. Z
fabric, use wire fence with a minimum 14 gauge and least 1.5 ft beyond the ditch banks to keep overflow water from undercutting and a maximum mesh spacing of 6 inches. ~ ' w W
~ 1 STANDARD CONSTRUCTION ENTRANCE 40X 3. Extend stone at least enters the channel. CONSTRUCTION
C- Not to Scale 04000.08 the dam as it re-enters sr~r ~ of ~ Temporary Seeding Recommendations for Summer
4. Set spacing between d ween dams to assure that the elevation of the top of the lower dam is the Construct the sediment barrier of standard strength or gth or extra strength synthetic filter fabrics. i
same as the toe elevatio DEWATERING elevation of the upper dam. ; Seeding mixture
- 5. Protect the channel d over and around the da `I.~ c swat 6. Make sure that the ch °g - 7. Ensure that channel a ~ y a subject to damage or blo Ensure that the height of the sediment fence does not nnel downstream from the lowest check dam, considering that water will flow yes not exceed 18 inches above the ground surfoc Species Rote (Ib/acre)
he dam. Construct the filter fabric from a continuous roll cut to cut to the length of the barrier to avoid joint German millet 40 IWAA
are necessary. securely the channel reach above the most upstream dam is stable. fasten the filter cloth only of a support post with overl innel appurtenances, such as culvert entrances below check dams are not Support standard strength filter fabric by wire mesh fa or blockage from displaced stones. heavy duty wire staples at least 1 inch long. or tie wir trench.
h overlap to the next post. i ~ ' In the Piedmont and Mountains. asmall-stemmed Sudangrass may be substituted at a rate of 50 Ib/acre.
esh fastened secure) to the u slo e side of t ~ ~ y P P , , ' li Seeding dates
tie wires. Extend the wire mesh support to th; ~ ~ ~ , ~ Mountains -May 15 -August 15
- 8. Construct the outlet stone is recommended) a outlet using well-graded stones with a D-50 size of 9" (class B erosion control ; ' , Piedmont -May 1 -August 15
ided) and a maximum stone size of 14". A 1-ft thick layer of 1 /2" to 3/4" When a wire mesh support fence is used, space posts posts a maximum of 8 ft apart. Support posts ,~~I~ ~ Coastal Plain -April 15 -August 15 'I
2`~ COPE' aggregate (N.C.D.O.T. #57 .T. X57 washed stone is recommended) should be placed on the inside face to driven securely into the ground to a minimum of 18 i >w rate. does not require wire mesh support fence. f 18 inches. Extra strength filter fabric with 6-ft ~ ~ SOiI amendments
reduce drainage flow rate TEMP. SEDIMENT POOL ~ ~ , Follow recommendations of soil tests or apply 2.000 Ib/acre ground
2 Staple or wire the filter fabric directly to posts. ~!,<<.} • . agricultural limestone and 1000 Ib/acre 10-10-10 fertilizer.
Mulch
WIRE SCREEN - ~16` C- Not to Scale 04000.06 Excavate a trench approximately 4 inches wide and 8 i S"`~' °F' from the barrier. end 8 inches deep along the proposed line of post Apply 4,000 Ih/acre straw. Anchor straw by tacking with asphalt,
F, . f netting or a mulch anchoring tool. A disk with blades set nearly O ~
t' MIN 2' MAX Backfill the trench with compacted soil or gavel placed placed over the filter fabric. Do not attach filter k ~ ~ straight can be used as a mulch anchoring tool.
existing trees. q Pipe Outlet to Flat Area With q ~ Maintenance V
DROP INLET ~ No Defined Channel ~ 1~ ~ ' Refertilize if growth is not fully odequate. Reseed, refertilize and
SEDIMENf~ aiin vrtn~~ 1 MAINTENANCE '°'°r~' I and mulch immediately tollowing erosion or other damage.
DEWATERING
Inspeci sediment fences at least once a week and afte 3d yy Should the fabric of a sediment fence collapse, tear, d o d~- Replace burlap every 60 days. id after each rainfall. Make any required .repairs immediately. rk.
CONSTRUCTION SPECIFICATIONS 3 1. Lay one block on each side of the structure on its side tear, decompose or become ineffective, rep~ace .t P~omPt~y. Temporary Seeding Recommendations f O t" FCt ~ ~
in the bottom row to allow pool droinoge. The foundation Remove sediment deposits as necessary to provide ade pressure on the fence. ie adequate storage volume for the next rain and tp reduce Seeding mixture
should be excavated at least 2 inches below the crest of the storm drain. Place the bottom row of blocks against
the edge of the storm drain for lateral support and to avoid a~ Species Rate (Ib/acre) 4mm4
washouts when overflow occurs. If needed, 9ive lateral support to subsequent rows by placing 2 x 4 wood studs Take care to avoid undermining the fence during clean ~ a~ deposits and bring the area to grade and stabilize it a stabilized. cleanout. Remove all fencing mate~iols and unst ~ ~ Rye (groin) 120 ze it after the contributing drainage area has bee " ~ ~
through block openings. Seeding dates i -0 TOMM4 o
2. Carefully fit hardware cloth or comparable wire mesh with ~ Mountains -August 15 - December 15
1 /2-inch openings over all block openings to hold gravel in place. T 3 STANDARD T Section A-A ~ C- Not to scale s ~RD TEMPORARY SILT FENCE (40X) Coastal Plain and Piedmont -August 15 -December 30 U
~ Soil amendments Scale ^
3. Use clean gravel, 3/4 to 1/2-inch in diameter, placed 2 inches below the top of the block on a 2:1 slope or flatter and smooth it to ~ilter Blanket Follow recommendations of soil tests or apply 2,000 Ib/acre ground
an even grade. DOT #57 Washed stone is recommended. agricultural limestone and 1000 Ib/acre 10-10-10 fertilizer.
MAINTENANCE Ro Shoul Pipe Outlet to Well Defined Channel Road ~ Shoulder ' Mulch Iwo)
c ~y~ ~ ; Apply 4,000 Ib/acre straw. Anchor straw by tacking with asphalt,
Inspect the barrier after each rain and make repairs as needed. ~ ~ ~ Exist. E ' ~ netting or a mulch anchoring tool. A disk with blades set nearly
Remove sediment as necessary to provide adequate storage volume straight con be used as a mulch anchoring tool.
for subsequent rains. 1 Maintenance 2 2 Grass D-i~ 1'' Repair and refertilize damaged areas immediately. Topdress with 50
When the contributing drainage area has been adequately stabilized. Synthetic ithetic Mat or A - "'~SY .4. w~ nitrogen in March. If it is necessary to extend temporary cover
removed all materials and any unstable soil, and ether salvage or dispose of it properly. Bring the disturbed area to proper grade, do Straw Net ~ ~o~ aw Netting ~ 5, B - w/Straw 4, beyond June 15, Ib/acre of overseed with 50 Ib/acre Kobe (Piedmont
then smooth and compact it. Appropriately stabilize all bare areas ' , ~ z ~ or Coastal Plain or (Korean) Mountains lespedeza in late February
around the inlet. Grass Channel Section, Typ ~ ~ ; or early March.
4
C- Not to Scale Road 2. Temporary Seedin9 Recommendations for
Shoulder ---~j ; Late Winter and Early Spring
T Section A-A Seeding mixture 00
~ m n ~ Exist.: Species Rate (Ib/acre)
Filter Blanket 6 Rye (grain) 120
2 2 Annual lespedeza (Kobe in Piedmont and 06
Notes: Paved Channel Section, T Coastal Plain Korean in Mountains) 50
1) La is the length of the ~iprap apron. y~`~ ~ Omit annual lespedeza when duration of temporary cover is not to extend 7 i,.
2) d+1.5 times the maximum stone diameter beyond June.
but not less than 6" Seeding dates
3) In owell-defined channel extend the apron up the channel banks to an elevation of 6" See Site Plan for Channel slope ' ' I Mountains Above 2500 ft. -February 15 -May 15
above the maximum toilwate~ depth or to the Exist. Grade MountainsBelow 2500 ft.~ -February 1 -May 1
bank, whichever is Bess. Riprap Channel Notes: 4) A filter blvnket or filter fabric should be installed 'q Piedmont January 1 May 1 ~ Coastal Plain -December 1 -April 15
between the riprap and soil foundation.
1. Line subgrade with Mirafi 500X ~ ~ ~ ~ ~ ~ ~ ~ ' Soil amendments
geotextile fabric prior to placing 5,. Follow recommendations of soil tests or apply 2,000 Ib/acre ground 2 2 `I~{1~ a' . agricultural
riprap. RipruP 2. Channel shall be lined with X50 - tiprup M ~ ~ ~ MUICh
X50 - 12„ . ~ ~ r~ ~ Apply 4.000 Ib/acre straw. Anchor straw by tacking with asphalt. Vertical Scale:
NCDOT Class 1 riprap. Dmo~2 5 RIPRAP T T P N 6 CHANNEL S C-2 Not to Scale C-2 Not to Scale ~mo~ ~ 8 3' ' ~f `Ap ; , F , netting, or a mulch anchoring tool. A disk with blades set nearly NONE
T = 2~ ~ be used as a mulching anchoring tool.
Permanent Riprap Channel ~ ~ be used as a mulch anchoring tool.
' Maintenance Horizontal Scale:
IEL SECTIONS ~ Refertilize if growth is not fully adequate. Reseed, refertilize and mulch immediately following erosion or other damage. " AS-NOTED
SPECIAL CONDITIONS: Scale j „t
Issue Date:
This Stabilization Plan addresses certain specific conditions ~
and features-of-work. All existing features-of-work were designed by others. The conditions that have resulted in 5-30-2007
the issuance of the "Notice of Violation(s)" by the
NCDENR-DWQ occurred prior to the preparation of this Plan.
By accepting this Plan, you and any others to whom it is
distributed, agree to a strict limitation of liability for Terry 1
t. Allen FL,, I.L. ALLtN tNVINttKINU, N.t;., and its Nllm~/
employees to an amount not to exceed the fee paid in i
hand. rl r. i.17~. li; SHEET 2 OF 2J
.r, 1 "1"01,015 w go loop" J' . 1 ~1 ~ I I I
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