SW8910506_Approved Plans_19910710

OYSTER BAY 'plr�HASE THREJ
SEA TRAIL PLANTATION
F-i]ROSION CONTROL AND STORMWATER PLAN
DEVELOPED BY:
SEA FRAIL CORPORATION
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:OPYC T . Erg- SEER i _cE S .

-OPY'l,',AT IECH �",F H"

NOTES:
1. VIGOROUS STAND OF PERMANENT GRASS COVER SHALL BE
ASTABLISHED AS SOON AS POSSIBLE ALONG THE. CENTER
LINE AND BANKS OF CHANNEL.
2. WHERE SLOPE OF CHANNEL BOTTOM EXCEEDS 1.5%, JUTE
THATCHING, OR OTHER EFFECTIVE CHANNEL LINING
MATERAL, SHALL BE USED TO PROTECT CHANNEL CENTER
LINE AND BANKS. (SEE -INSTALLATION OF JUTE THATCHING IN
ROAD SIDE SWAL.ES,")
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EXISTiNTG CON A l lUS
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EXISTING SANE
TEMPORARY SEDIMENT PIT
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Press end-s of jute 4 ii whes ind to ic soil
around struct:ttre!; alld staple securely.
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ROADISIDIEW SWA JUTET AT HINS
STABILTZATIO"NN DETAIL
NTS
INSTALLATT ALES OF TRATCEUNG IN ROADSIDE $R:—
WHERE APPLICABLE
Jute the tchirig shall be used in roadside swale where the slope exceeds 0.015(1.50/6)
SPECIFICATION GUIDE
A Preparing a channel and seeding: To prevent meandering, sloe channel to
center to confine low flows to the channel where thatching will be laid
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I. Fertilization - Lime and fertilize as specified in "Grassing Schedule".
ID-sk needed but do notipa
.cultck.
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V-igging Plant grass sprigs or, similar material before the tllofive SPI
Spacings for plantingmay, vary. Suggestedmaximum
3. Seedings - Split the apoicatiop. Sow half the seed before placing the
thatching, Plant the remaining half after the thatching is laid.
B. Laying the 'Matching: The thatching, shall be laid on loose soil after all racks,
clods and sticks' have been picked up that xould, prevent contact with the soil
surfaw_-.
I. Start laying the thatching from the, top of the channel and unroll do--.�,nf grade
so that one edge of the strip coincides with the channel center. Iay a second
s,-o th trip parallel tea first on the other side of the channel anhd allow a 2 inc
overlap. If one roll of thatching does not extend the length of the channel.
continue downhill urith additional rolls.
2 Securing the Thatching - Bury the top end of the jute strip in a tr ' tnch 4
inches or more deep. Tamp the trench full of soil. Reinforce with a row of
staples driven through the jute about 10 inches apart. Then staple the
overlap in the channel center. These staples should be 3 to 4 feet apart. The
outside edges may be stapled similarly at any time after the center has been
stapled. (floser stapling along the sides is required where concentrated
water may flow into the channel.
Where one roll of thatching ends and another roll begins' the end of the top,
strip overlaps the trench where the upper end of the lower strip is buried.
Make the overlap at least 4 inches and staple securely.,
a Erosion Stops - At any point the thatching may be.folded for burying in slit
trenches and secured as were the upper ends. This checks water flow and
erosion that may begin under the matting. It also gives improved tie -down.
The procedure is recommended on steeper slopes and gentler slopes . of
sandy soil or areas subject to seepage. Spacings of stops vary from 2 5 to 100
feet.
4. Diversions - Where diversion terraces outlet into the waterway, the outlet
should be protected with thatching used in the same manner as in the main
channel. The thatching for the outlet is laid first so, that thatching in the
main channel will overlap the outlet strip.
Ei. Thatching - Soil Contact - Get contact between thatching and soil by rolling
at Tight angle after laying, stapling and seeding is complete. Perfect contact
1
e _cntac
is vital k_eep water flow over not under the thatchin
G Staples - Hairpin -shaped wire staples, number 8 gauge; 8 and 10 inches
long have been used. The longer staples are used in loose or wet soil. Wire
staples are better than wooden pegs because the staples can be driven
flush with the matting. Wooden pegs extend above the thatching and may
catch trash that diverts water flow out of the thatch protected channel.
Wooden pegs may also set up damaging turbulence.
C. Inspection: After job completion, make sure the thatching is in contact with
the soil at all. places and the critical areas are secureh, stapjed down.
R/W
low
PROFP�SIEO ASPHAUT
YPICAL ROADSIDE SWALE
MIN. SIDESLOPE 3.1
MAX. SIDESI-OPE 5-1
TYPICAT
A-3.L.W R""ADWAY SECTION
NTS
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�op of [3CRN—,
TOP ELEVATION OF S` R M, WA T C R
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WASHE 0
t.,!, FLOOD ST OR A GE ZONE
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3' SCOIMENT-_STOAAGC ZONE
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tOTAL BAN CAPACITY)
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HEEFORE CLEA N01J
111�Mll
LEVEL OF COLLECTED- — M N,
C, L E N Ei, S I 11 4 lt Y I E I I T H' 1 S L E V E L 1 S R E A C �C 0
SECTION THRU SEDIATENT PIT & FILTER
NTS
CARPY RIP -RAP UP
SIDC S OF SPILLWAY
17'
-2
tok itj t
4,
W &Sr
r STONE
4
SECTION THRU BERM & FILTER
NTS
TEMPORARY SEDIMENT PIT DETAIL
NTS
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PLAN"VIEW DISSIPATION PAS La km
1 6' 31
2 10' 4'
3 4' 3'
4 81 4'
SEE PLAN FOR DISSIPATION PAD NUMBER
FLARED END SECTION MEDIUM STONE DIA. = d5O = 4" (TYP.)
MAX STONE DIA. 6" (TYP,)
FLOW
SLOPE y
J MIN.
UNUERLAY STONE
W/ FILTER CLOTH
SECTION VIEW
weU graded with a median
050)I 1-te ni,%xinium stone
'M:v%n4, size e,4'4
st
2, Apf,­o;n,fh.1 '(d) shall be at least 9".
Thy aq,x, n s ,-Al 1�wextet id , ed up the channel
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LRDT DIETAIL
NTS
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1. Obtain approval of Erosion Control Plan from NCDHENR - Land Quality
section.
2. Install erosion control measures in the manner shown, as applicable for
the situation.
3. Obtain certificate of compliance through on -site inspection by Erosion
Control Engineer. Contract person Mr. Dan Sams (919-256-4161).
4. Clean sediment traps as indicated on the individual details.
5. Seed and mulch disturbed areas within 30 days after finished grades are
established.
6. Maintain erosion control measures until permanent ground cover is
established. ('ffie use of winter rye grass is constricted and temporary
measures and will not be considered as permanent ground cover.)
7. Request final approval by Erosion Control Engineer.
S. Remove temporary erosion control measures and stabilize these areas
immediately. Permanent erosion control measures shall remain.
SEEDING SCHEDIULE
i
I All disturbed areas due to construction and any severely eroded areas shall be stabilized by the
establishment of a permanent grass cover. The seed species shall be selected based on the type
soil present, seasonal conditions and other considerations. As an alternative, the contractor
may use the methods and schedules shown below; however, it is recommended that a specialist
be consulted with attention given to site specific conditions.
Grass -Lined Swales
a. Scour the bottom and banks of the 0/ales in preparation of lime, fertilizer and seed
application.
b. Apply ground. agricultural limestone at the rate of 3000 lbs. per acre.
c. Apply 10- 10- 10 commercial fertilizer at the rate of 500 lbs, per acre.
d. Sow Common Bermuda Grass at a rate of 40 - 80 lbs. per acre.
c. NL4ulcli using jute, excelsior matting, or other effective channel lining material to cover
the bottom and side slopes of swales which have a lonCritudinal channel slope
1.5 percent (min. side slopes = 3:1, max. side slopes — 5:1). Such lining shoLl'id
extend above the elevation anticipated for the water surface of the 10-year storin
event. I On swale side slopes above this height.. and in drainages not requiring
temporary linings, apply I lining, , ply 4,(M lbs. per acre gain straw and anchor straw by staplino,
netting over the wp.
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f. A minimum of 3 weeks is required for establishment. Inspect and repair mulch
frequently. Refertilize the following April with 50 lbs. per am of nitrogen.
All Otht-, Ar�s
a. Cultivate area to a depth of 5 inches
b. Apply aghculturall Iii-ne at the rate of -4000 lbs. per acre
L I Z� c. Apply 10-20-20 ciammercial fertilizer at the rate of 500 lbs. per acre
d. Sow grass seeds at the following rates:
Kind Rate Per Acre
Common Bermuda Grass
unhulled 25 lbs.
hulled 12 lbs.
Pensacola Bahiagrass 50 lbs.
Korean Lespedeza 25 lbs.
Tall Fescue 30 lbs.
e. Mulch with straw at the rate of 3250 to 4350 lbs. per acre.
f. Anchor straw with asphalt emulsion tack coat applied at the rate of 300 gallons per
acre.
Where it is not possible to establish a permanent grass cover in a reasonably short period' of
time due to seasonal considerations, a temporary grass cover shall be established. The
temporary cover shall include the planting of annual grasses or small grains such as rye grass,
however shall not be considered a permanent grass cover. Where the season
or other conditions are not suitable for growing a temporary erosion resistant cover, mulch
may be applied, however, mulch used alone, shall be for the shortest time practical. A
temporary or permanent vegetative cover shall be established as soon as conditions are
favorable.
3 Topsoil shall be used over unfavorable soil conditions for successful establishment of
vegetative cover.
4. Irrigate as necessary to optimize plant growth.
Tee,
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