HomeMy WebLinkAbout04080060 116th Street Center, Site Construction Plans pg. 17B
C
B
C
REQUIREMENTS CONTRIBUTING DRAINAGE AREA: 100 ACRES MAXIMUM.
(EXHIBIT 3.41 -B
AND C)
SEE SHEET C202
FOR LOCATIONS
OF OUTLET
PROTECTION
REQUIRED
MAINTENANCE
COMMON
CONCERNS
PURPOSE
(EXHIBIT 3.64 -A)
REQUIREMENTS
(EXHIBIT 3.64 -B)
MAINTENANCE
CAPACITY: PEAK RUNOFF FROM 10 -YR, FREQUENCY, 24 -HR. DURATION STORM EVENT,
APRON: DESIGN DEPENDS ON CHANNEL DEFINITION (SEE EXHIBIT 3,41 -B), BUT iS LONG ENOUGH
TO DISSIPATE RUNOFF ENERGY, SET ZERO GRADE, STRAIGHT AND ALIGN WITH THE RECEIVING STREAM.
(IF SITE CONDITIONS REQUIRE A CURVE, SET 1T NEAR THE UPSTREAM END.)
FOUNDATION: GEOTEXTILE FABRIC FOR STABILIZATION AND FILTRATION OR WELL GRADED GRAVEL FILTER
LAYER AT LEAST 6 IN. THICK.
APRON AT ZERO GRADE
25/ 75# RIP -RAP
d50= 50#
OUTLET: STABLE.
PRACTICE 3.41
ROCK CHUTE
18" MIN.
NO OVERFALL
FILTER FABRIC
2' 0" MIN.
ANCHOR
TRENCH
0
RIPRAP DETAIL
SEE PLAN FOR LIMITS
18" MIN.
DEPTH
GEOTEXTILE
N NOTE:
SEE PLANS AND SPECIFICATIONS
FOR SIZE OF RIPRAP.
PRACTICE 3.64
SANDBAG CURB INLET SEDIMENT BARRIER
RUNOFF
GAP BETWEEN BAGS
ACTS AS A SPILLWAY
2'
ANCHOR FABRIC
2' -O" MIN.
0
SANDBAGS OVERLAP
ONTO THE CURB
LP'
EXHIBIT 3.41 -B. II EL E L UT E GOR)A APRONS FOR .A CHANNEL (LEFT) THAT
a• r.
ANT
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L ira+rs /s
S NOT
MAKE NEEDED REPAIRS IMMEDIATELY; USE APPROPRIATE SIZE STONE, AND DO NOT PLACE THEM ABOVE
FINISHED GRADE
EXHIBIT 3.64 -B. DETAIL OF A SANDBAG CURB SEDIMENT BARRIER TO PROTECT A CURB INLET.
MATERIALS: HARD, ANGULAR, AND HIGHLY WEATHER RESISTANT RIPRAP STONE OF SiZE AND GRADATION
THAT WILL WITHSTAND THE VELOCITIES OF THE CHUTE. (SPECIFIC GRAVITY AT LEAST 2.5; SIZE
AS SPECIFIED IN DESIGN.)
THICKNESS: 12 IN. MINIMUM OR TWO TIMES THE d5o STONE DIAMETER, WHICHEVER IS GREATER.
INSTALLATION 1. EXCAVATE THE APRON AREA SUBGRADE BELOW DESIGN ELEVATION TO ALLOW FOR THICKNESS OF THE FILTER
(OR GRAVEL LAYER) AND THE RIPRAP. (THIS OVER EXCAVATION GREATLY INCREASES THE AMOUNT OF SPOIL.)
2. COMPACT ANY FILL USED IN THE SUBGRADE TO THE DENSITY OF THE SURROUNDING UNDISTURBED MATERIAL,
AND SMOOTH ENOUGH TO PROTECT FABRIC FROM TEARING.
3. PLACE THE GEOTEXTILE FABRIC (OR GRAVEL LAYER) ON THE COMPACTED AND SMOOTHED FOUNDATIONS. IF
MORE THAN ONE FABRIC PIECE IS NEEDED, THE UPSTREAM PIECE SHOULD OVERLAP THE DOWNSTREAM
PIECE BY AT LEAST 1 FT.
4. INSTALL THE RIPRAP TO THE LINES AND ELEVATIONS SHOWN IN THE DESIGN. IF THE CHANNEL IS POORLY
DEFINED, THE FILTER (OF GRAVEL LAYER) AND RIP RAP SHOOED EXTEND TO THE TOP OF THE BANK
(EXHIBIT 3.41 B).
5. IF THE GEOTEXTILE FABRIC TEARS WHEN PLACING THE RIPRAP, REPAIR IMMEDIATELY BY LAYING AND STAPLING
A PIECE OF FABRIC OVER THE DAMAGED AREA, OVERLAPPING THE UNDAMAGED AREAS AT LEAST 12 IN.
6. MAKE SURE THE TOP OF THE RIPRAP APRON IS LEVEL WITH OF SLIGHTLY BELOW THE RECEIVING STREAM.
(RIPRAP SHOULD NOT RESTRICT THE CHANNEL OR PRODUCE AN OVERFALL.)
7. BLEND THE RIPRAP SMOOTHLY TO THE SURROUNDING GRADE.
STABILIZE ALL DISTURBED AREAS IMMEDIATELY FOLLOWING INSTALLATION.
INSPECT ROCK CHUTES AFTER STORM EVENTS FOR STONE DISPLACEMENT AND FOR EROSION AT THE SIDES AND
ENDS OF THE APRON.
TO TRAP SEDIMENT ON PAVED STREETS THAT RECEIVE RELATIVELY SMALL RUNOFF FLOWS, PREVENTING IT
FROM BEING TRANSPORTED FURTHER DOWN THE STREET OR INTO AN INLET.
NOTES: (1) TRAPPING SEDIMENT AT A CURB INLET WILL BE DIFFICULT iF EROSION /SEDIMENT CONTROL
MEASURES ARE NOT INSTALLED TO REDUCE THE VOLUME OF SEDIMENT REACHING THE INLET. (2) THIS
PRACTICE CAN BE USED IN CONJUNCTION WITH OTHER CURB INLET SEDIMENT CONTROLS.
LOCATION: ON CURBED PAVED STREET DOWN GRADE FROM UGHT CONSTRUCTION ACTIVITY (e.g., INDIVIDUAL
HOME) AND ABOVE THE INLET.
CONTRIBUTING DRAINAGE AREA: 1 ACRE MAXIMUM.
CAPACITY: RUNOFF FROM A 2 -YR. FREQUENCY, 24-HR. DURATION STORM EVENT ENTERING THE STORM
DRAIN WiTHOUT BYPASS FLOW.
HEIGHT: 1 -3 LAYERS OF SANDBAGS (AS NECESSARY)
LENGTH: AS NEEDED TO INTERCEPT RUNOFF (3 FT. MINIMUM).
TRAFFIC BARRICADES (OPTIONAL): AS NEEDED TO PREVENT VEHICLES FROM HITTING THE BARRIER.
INSTALLATION 1. FILL BAGS APPROXIMATELY HALF FULL WITH SAND OR FINE GRAVEL.
2. UPSLOPE FROM THE CURB INLET, LAY THE BAGS TIGHTLY END TO END IN A ROW CURVING FROM THE CURB AND
AWAY FROM THE INLET.
3. OVERLAP THE BARRIER ONTO THE CURB, AND EXTEND IT A MINIMUM OF 3 FT. INTO THE STREET TO INTERCEPT
THE RUNOFF.
4. IF USING MORE THAN ONE ROW, OVERLAP THE BAGS WITH THE ROW BENEATH, AND LEAVE A ONE -BAG GAP IN
THE MIDDLE OF THE TOP ROW TO SERVE AS A SPILLWAY.
5. FOR ADDITIONAL STORAGE CAPACITY, CONSTRUCT A SERIES OF SANDBAG BARRIERS ALONG THE CURB SO EACH
TRAPS SMALL AMOUNTS OF SEDIMENT.
*INSPECT FREQUENTLY FOR DAMAGE BY VEHICULAR TRAFFIC, AND REPAIR IF NEEDED.
*INSPECT AFTER EACH STORM EVENT.
*REMOVE SEDIMENT (BUT NOT BY FLUSHING) WHEN IT REACHES HALF THE HEIGHT OF THE BARRIER.
*DEPOSIT REMOVED SEDIMENT WHERE IT WILL NOT ENTER STORM DRAINS.
VEHICULAR HAZARD IF BARRIER IS TOO HIGH OR TOO LONG CONSIDER USING TRAFFIC BARRICADES.
VEHICULAR DAMAGE TO BARRIER REPAIR IMMEDIATELY.
SANDBAGS NOT PLACED TIGHTLY TOGETHER RESULTS IN POOR TRAP EFFICIENCY.
DRAINAGE AREA TOO LARGE RESULTS IN POOR TRAP EFFICIENCY AND /OR SEDIMENT OVERLOAD.
APPROACH TOO STEEP CAUSES HIGH FLOE VELOCITY RESULTING IN POOR TRAP EFFICIENCY AND SANDBAGS
DISLODGING; USE A DIFFERENT INLET PROTECTION PRACTICE.
SEDIMENT NOT REMOVED FOLLOWING A STORM EVENT RESULTS IN INCREASED SEDIMENT TRACKING, TRAFFIC
HAZARD, AND EXCESSIVE PONDING.
PURPOSE
Seasonal Soil Protection Chart Table "A"
Stabilization
Practice Jan Feb Mar Apr May Jun Jul Aug Sep Oct
Permanent
Seeding
Dormant
Seeding
Temporary
Seeding
Seeding
Mulching
REQUIREMENTS
(EXHIBIT 3.01-B)
MAINTENANCE
B
G
Irrigation needed for 2 to 3 weeks after applying sod.
1 STAPLE PER SQ. YD. 1 1/2 STAPLES PER SQ. YD.
SLOPE
iENGiH
FT.
300
275
250
225
200
175
150
125
100
75
50
25
.1
C
F
F
GENERAL STAPLE RECOMMENDATIONS
s:1 71 1:1
SLOPE GRADIENT
NOTES:
1. BEGINNING AT THE TOP OF THE
$d.QPE BY ANCHORING THE BLANKET
IN A 6" DEEP M 6" WIDE TRENCH.
BACKFILL AND COMPACT TRENCH
AFTER STAPLING,
2. THE EDGES OF PARALLEL BLANKETS
MUST BE STAPLED WITH APPROX.
2" OVERLAP.
3. WHEN BLANKETS MUST BE SPLICED
DOWN THE SLOPE, PLACE BLANKETS
END OVER END (SHINGLE STYLE) VdTH
APPROX. 6" 0 STAPLE THROUGH
OVERLAPPED AREA APPROX. 12' APART.
/CROAD
A //�//l/////
6 IN. (MIN.)
CHANNEL
urwG
TO KEEP MUD AND SEDIMENT OFF PUBLIC ROADS.
GEOTEXTILE FABRIC TO STABILIZE FOUNDATION
i D
/0
(ESPECIALLY IMPORTANT WHERE WETNESS IS ANTICIPATED)
/f/1
EROSION CONTROL
MAT INSTALLATION
/1/
A Kentucky Bluegrass 40 lbs /acre; Creeping Red Fescue 40 lbs /acre;
plus 2 tons straw mulch /acre, or add Annual Ryegrass 20 lbs/acre.
B Kentucky Bluegrass 60 lbs /acre; Creeping Red Fescue 60 lbs/acre;
plus 2 tons straw mulch /acre, or add Annual Ryegrass 30 lbs /acre.
C Spring Oats 3 bushel /acre.
D Wheat or Rye 2 bushel /acre.
E Annual Ryegrass 40 lbs /acre (1 lb/1000 sq. ft.).
F Sod
G Straw Mulch 2 tons /acre.
"(I/ irrigation needed during June, July and /or September.
2 STAPLES PER SQ. YD.
NOTE: INSTALL NORTH AMERICAN S150
EROSION CONTROL BLANKET OR
APPROVED EQUAL.
PAVEMENT OR EXISTING GRADE
TYPICAL SECTION EROSION CONTROL
MAT INSTALLATION AT TOP OF SLOPE
EXHIBIT 3.01 -B. PLAN OF A TEMPORARY GRAVEL CONSTRUCTION ENTRANCE /EXIT PAD.
INSTALLATION 1. AVOID LOCATING ON STEEP SLOPES OR AT CURVES IN PUBLIC ROADS.
(EXHIBIT 3.01 -C)
TO PROVIDE A STABLE ENTRANCE EXIT CONDITION FROM THE CONSTRUCTION SITE.
50 FT. (MIN.)
Nov Dec
B
EROSION CONTROL MAT INSTALLATION DETAIL
PRACTICE 3.01
TEMPORARY GRAVEL CONSTRUCTION ENTRANCE /EXIT PAD
MATERIALS: 2 -3 IN. WASHED STONE (INDOT CA NO. 2) OVER A STABLE FOUNDATION.
THICKNESS: 6 IN. MINIMUM
WIDTH: 20 FT. MINIMUM OR FULL WIDTH OF ENTRANCE /EXIT ROADWAY, WHICHEVER IS GREATER.
LENGTH: 50 FT. MINIMUM. THE LENGTH CAN BE SHORTER FOR SMALL SITES SUCH AS FOR INDIVIDUAL HOME.
WASHING FACILITY (OPTIONAL): LEVEL AREA WITH 3 IN. WASHED STONE MiNiMUM OR A COMMERCIAL RACK,
AND WASTE WATER DIVERTED TO A SEDIMENT TRAP OF BASIN (PRACTICE: 3.72).
GEOTEXTILE FABRIC UNDERLINER: MAY BE USED UNDER WET CONDITIONS OF FOR SOILS WITHIN A HIGH
SEASONAL WATER TABLE TO PROVIDE GREATER BEARING STRENGTH.
2 -3 IN. COARSE
AGGREGATE
20 FT. (MIN)
2. REMOVE ALL VEGETATION AND OTHER OBJECTIONABLE MATERIAL FROM THE FOUNDATION AREA, AND
GRADE AND CROWN FOR POSITIVE DRAINAGE.
3. IF SLOPE TOWARDS THE ROAD EXCEEDS 2%, CONSTRUCT A 6 -BIN. HIGH WATER (RIDGE) WITH 3:1 SIDE
SLOPES ACROSS THE FOUNDATION AREA ABOUT 15 FT. FROM THE ENTRANCE TO DIVERT RUNOFF AWAY
FROM THE ROAD (PRACTICE 3.24)(SEE EXHIBIT 3.01 -C).
4. INSTALL PiPE UNDER THE PAD IF NEEDED TO MAINTAIN PROPER PUBLIC ROAD DRAINAGE.
5. IF WET CONDITIONS ARE ANTICIPATED, PLACE GEOTEXi1LE FABRIC ON THE GRADED FOUNDATION TO IMPROVE
STABIU TY.
6. PLACE STONE TO DIMENSIONS AND GRADE SHOWN IN THE EROSION /SEDIMENT CONTROL PLAN, LEAVING
THE SURFACE SMOOTH AND SLOPED FOR DRAINAGE
7. DIVERT ALL SURFACE RUNOFF AND DRAINAGE FROM THE STONE PAD TO A SEDIMENT TRAP OR BASIN.
EXHIBIT 3.01 -C. TEMPORARY CONSTRUCTION ENTRANCE /PAD WITH DIVERSION RIDGE WHERE GRADE EXCEEDS 2%
INFECT ENTRANCE PAD AND SEDIMENT DISPOSAL AREA WEEKLY AND AFTER STORM EVENTS OR HEAVY USE.
RESHAPE PAD AS NEEDED FOR DRAINAGE AND RUNOFF CONTROL.
TOPDRESS WITH CLEAN STONE AS NEEDED.
IMMEDIATELY REMOVE MUD AND SEDIMENT TRACKED OR WASHED ONTO PUBLIC ROADS BY BRUSHING OR
SWEEPING. FLUSHING SHOULD ONLY BE USED IF THE WATER CONVEYED INTO A SEDIMENT TRAP OR BASIN.
REPAIR ANY BROKEN ROAD PAVEMENT IMMEDIATELY.
PROPOSE
PRACTICE 3.52
FABRIC DROP INLET PROTECTION
2X4 IN. WOOD FRAME
BURIED FABRIC
COMPACTED FILL
INSTALLATION 1. TO PREVENT RUNOFF FROM BYPASSING THE INLET, SET THE TOP OF THE FABRIC AT LEAST 6in. BELOW THE
DOWN SLOPE GROUND ELEVATION, OR BUILD A TEMPORARY DIKE (COMPACTED TO 6in. HIGHER THAN THE FABRIC)
ON THE LOW SIDE OF THE INLET (SEE EXHIBIT 3.52 -C).
2. CUT THE FABRIC FROM A SINGLE ROLL TO ELIMINATE JOINTS. (PROVIDE AT LEAST 2FT. OF OVERLAP IF
A JOINT IS NEEDED,)
3. BURY THE BOTTOM OF THE FABRIC AT LEAST 1 FT. DEEP, BACKFILL, AND COMPACT THE BACKFILL
(SEE EXHIBIT 3.52 B).
4. SPACE THE SUPPORT POST EVENLY AGAINST THE INLET PERIMETER A MAXIMUM OF 3 FT. APART,
AND DRIVE THEM ABOUT 1 -1 2 FT. INTO THE GROUND. (OVERFLOW MUST FALL DIRECTLY INTO
THE INLET AND NOT UNPROTECTED SOIL
MAINTENANCE INSPECT THE FABRIC BARRIER AFTER STORM EVENTS, AND MAKE NEEDED REPAIRS IMMEDIATELY.
REMOVE SEDIMENT FROM THE POOL AREA TO PROVIDE STORAGE FOR NEXT STORM. AVOID
DRAINAGE OR UNDERCUTTING THE FABRIC DURING SEDIMENT REMOVAL
WHEN THE CONTRIBUTION DRAINAGE AREA HAS STABIUZED, REMOVE AND PROPERLY DISPOSE
OF ALL CONSTRUCTION MATERIAL AND SEDIMENT, GRADE THE AREA TO THE ELEVATION OF THE TOP OF
THE INLET, THEN STABIUZED IMMEDIATELY; USE APPROPRIATE SIZE STONE AND DON NOT PLACE THEM ABOVE
PRACTICE 3.74
SILT FENCE (SEDIMENT FENCE)
SUPPORT
WIRE
SEE NOTE
COMPACTED
SOP SOIL
OVERFLOW LEVEL SET TO
PREVENT BY-PASS FLOW
POST 18"
DEEP MiN.
BURIED FABRIC
APPROACH
TO RETAIN SEDIMENT FROM SMALL, SLOPING DISTURBED AREAS BY REDUCING THE VELOCITY OF SHEET FLOW.
INSTALLATION 1. PLAN FOR THE FENCE TO BE AT LEAST 10 FT. FROM THE TOE OF SLOPE TO PROVIDE A SEDIMENT STORAGE AREA.
2. PROVIDE ACCESS TO THE AREA IF SEDIMENT CLEANEST WILL BE NEEDED
MAINTENANCE INSPECT THE SILT FENCE PERIODICALLY AND AFTER EACH STORM EVENT.
IF FENCE FABRIC TEAR, STARTS TO DECOMPOSE, OR IN ANYWAY BECOMES INEFFECTIVE, REPLACE THE AFFECTED
PORTION IMMEDIATELY.
REMOVE DEPOSITED SEDIMENT WHEN IT REACHES HALF THE HEIGHT OF THE FENCE AT ITS LOWEST POINT OR IS
IS CAUSING THE FABRIC TO BULGE.
TAKE CARE TO AVOID UNDERMINING THE FENCE DURING CLEAN OUT.
AFTER THE CONTRIBUTING DRAINAGE AREA HAS BEEN STABILIZED, REMOVE THE FENCE AND SEDIMENT DEPOSITS,
BRING THE DISTURBED AREA TO GRADE, AND STABILIZED.
Construction Sequence for Building Site Erosion Control Practices
Subsoil
stockpile
Area to be topsoiled,
seeded, and mulched
by owner at completion
of construction.
Side yard
drainage swale
Sidewalk
Drop inlet
protection
Curb inlet protection
2. Maintain positive drainage away from the structure(s).
Rear yard
drainage swale
STREET
111111111111111111M1 GI 111 111 MIN 11
'Uti.•t•
Topsoil
stockpile
Existing curb and gutter
T
NORTH
Construction
entrance /exit
Sample Erosion /Sediment Control Practice Plan for Typical
One or Two Family Dwelling Under Construction
SEEDING
1. Scope of work to reestablish vegetative cover by seeding, either
permanent /temporary or erosion control types, as shown on the Plan.
EROSION CONTROL
PLAN LEGEND
Property line/
drainage swale
Erosion Control Sequence:
The following is the typical minimum erosion control sequence to be followed by
individual builders constructing homes on each lot:
2. Sodding (Alternate): Locally grown Bluegrass blend uniform in color, type,
density and thickness. Whenever possible, rolls of sod shall be used not
slabs of sod.
Existing drainage
Finished drainage
Tree conservation
Silt fencing
Gravel entrance
exit pad
Curb inlet
protection
Drop inlet
protection
Soil salvage
and utilization
Permanent
seeding
BUILDER'S EROSION CONTROL REQUIREMENTS
General:
1. Nothing contained herein shall limit any contractual agreements or
responsibilities individual builders may have with the Developer. These
requirements are to be considered in conjunction with or in addition to said
agreements.
2. The individual builder shall comply with the erosion control plan implemented by
the Developer.
1. Install silt fence along back of curb for the entire length of lot frontage on
the public street prior to any land disturbing activity taking place on the lot.
Maintain said silt fence until yard areas have been stabilized with healthy and
well- rooted, permanent vegetation. (Refer to Practices 3.12, 3.14, and 3.74)
2. Install temporary stone construction entrance /exit pad per Practice 3.01.
3. Store and distribute stockpiled earth and topsoil per Practice 3.02.
4. Improve stone construction entrance drive by extending it to the garage slab or
install permanent paved drive immediately after the building slabs have been
poured and cured.
5. Limit vehicular traffic and parking to the above described stone drive and public
street; except for material deliveries.
6. Remove accumulated mud from public streets (but not by flushing) with a
rubber -tired front end loader and /or by brushing or sweeping.
7. After yard areas have been stabilized with healthy and well- rooted, permanent
vegetation, remove the silt fence previously installed along the public street's
back of curb.
Inspections:
1. An inspection log will be maintained which will indicate, at a minimum, the
following items: a.) the time and date of inspection, b.) the inspector's name,
c.) identified deficiencies and d) corrective measures taken to rectify said
deficiencies.
2. The site shall be inspected at a minimum of once per week until all lots have
been built upon and the entire project is deemed complete.
3. Silt traps shall be inspected at a minimum after a rain event of more than one
half (1/2 inch accumulation.
4. Silt traps shall be replaced and silt basins shall be cleaned when less than 50%
efficient; i.e., when the silt basin is half full and /or silt fences are not
trapping silt effectively.
5. Developer will restore or replace damaged or improperly functioning erosion
control facilities and /or system within a period of seven (7) days.
6. If, upon inspection by Developer, Builder has tracked mud onto street, Builder
has one (1) day to remove accumulated mud. If Builder has not removed mud from
the street within said time frame, Developer will remove the mud within the
following 24 hours.
3. Permanent Seeding: March I to May 15 and August 10 to October 15 (dates
may vary at discretion of Landscape Architect depending on weather conditions).
a. Swales /Slopes: Blended mixture of seed shall be applied at the rate of
110 pounds per acre. The mixture shall consist of 40# Mustang
turf type Tall Fescue, 30# Banff or Wabash Kentucky Bluegrass, 30#
Fiesta Perennial Ryegrass and 10# Redtop Bentgrass.
b. Graded Area Adjacent to Pavement: Blended mixture of seed shall be
applied at the rate of 90 pounds per acre. The mixture shall consist
of 35# Mustang turf type Tall Fescue, 30# Fiesta Perennial Ryegrass and
25# Banff or Wabash Kentucky Bluegrass.
Temporary Seeding:
a. May 15 to August 15 40# per acre Annual Ryegrass.
b. August 15 to November 15 2 bushels per acre rye (grain) or wheat.
(May be dormant seeded between December 10 and February 28. Add
50% to seed quantity.)
c. March 1 to May 15 3 bushels per acre oats.
5. Erosion Control Seeding: An interim seeding to be applied to all disturbed
areas (as designated on plan) as soon as final grade is established. Mix and
apply as shown on detail sheet. (Note: if this seeding is applied immediately
on finish grading, it can save some further seeding and lengthen the duration
between maintenance of silt traps and barriers and street cleanings.)
6. Fertilizer: Commercial analysis 12 12 12 applied at a rate of 600# per
acre. Apply lime to raise pH of soil to level needed for species being
seeded. Work fertilizer and lime into the soil to a depth of 2 to 3
inches. (pH factor should be checked prior to seeding. Lime should not be
required if topsoil is replaced.)
7. All Hydroseeding shall be in accordance with the preceding requirements.
8. Mulch: Wood cellulose fiber may be used where application is made by
hydraulic mulching at the rate of one ton per acre. Straw mulch may be
used and applied uniformly in a continuous blanket at the rate of 2 tons
per acre within 24 hours after seeding in accordance with Section 621 of
IDHSS.
9. Sediment Control Fabric: Fabric shall be non -woven construction composed
of polypropylene and shall be ultraviolet stabilized.
10. If temporary seeding and /or erosion control seeding is established prior
to permanent seeding, the mulch may be eliminated except in "bare" areas.
11. If grading occurs during December, January or February, dormant seeding
procedures shall be used. It is imperative that all sediment filters and
traps ore in place prior to bulk earthmoving or clearing operations
commencing.
12. All areas along street shall be seeded with permanent seed mixture
as soon as grade is established. Reseeding may be required after
utility companies have installed their mains. If erosion control seeding
is established, the permanent seeding con be delayed until lot is improved.
13. Reseed any areas damaged or not germinating at intervals as may be
required according to seasonal conditions. Water grass and execute
necessary weeding until acceptable and full stand of grass has been
obtained. Upon acceptance by the Owner, the Owner shall assume
maintenance of the lawn areas.
14. All dates shown are nominal and may be varied with concurrence of the
Engineer, Landscape Architect, Local Soil Conservationist or Owner.
EROSION CONTROL BLANKET
Erosion control blanket shall be a machine- produced mat of 100% agricultural
straw.
The blanket shall be of consistent thickness with the straw evenly distributed
over the entire area of the mat. The blanket shall be covered on the top side
with polypropylene netting having an approximate 5/8" X 5/8" mesh and on the
bottom with a polypropylene netting with an approximate 1/4" X 1/4" mesh. The
blanket shalt be sewn together with cotton thread.
Straw erosion control blanket (or low velocity channel lining) shall be 575 as
manufactured by North American Green or equivalent. Erosion control blanket or
channel lining shall have the following properties:
a. Material Content:
Straw 100% (0.5 lb per square yard)(0.27 kilogram per square meter)
Netting One side lightweight photodegradable (1 lb per 1000 square
feet approximate weight)
One side heavyweight photodegradable (3 lb per 1000 square
feet approximate weight)
Thread Cotton
Physical Specifications (Roll):
Width 6.5 feet (2 meters)
Length 83.5 feet (25.4 meters)
Weight 30 lbs 10% (13.6 kilograms)
Area 60 square yards (50 square meters)
SITE PREPARATION
1. Smooth grade and compact all areas to be covered with mat.
2. Remove all rocks, dirt clods, grass clumps, trash and other obstructions
that will lift mat from ground surface.
ANCHOR TRENCHES
1. The mat must be anchored at the upstream and downstream ends of the
protected area and intermittently in between.
2. Excavate end trenches to a minimum of 12 inches deep and 6 inches wide
before placing mat.
3. Dig intermittent check slots 6 inches deep by 6 inches wide transverse to
mat at approximately 25 foot intervals.
Seeding Seed and fertilizer shall be spread uniformly before mat
installation. Seed type, fertilizer type and rate of applications shall comply
with seeding specifications.
MAT PLACEMENT
1. Unroll mat flat side against the ground. Unroll mat in direction parallel
with direction of water flow.
2. Mat should lay flat. DO NOT PULL MAT TAUT over ground. Pulling mat taut
may cause mat to bridge depressions in the surface and allow erosion
underneath.
3. Beginning at up or downstream end, bury transverse terminal end of the mat
to secure and prevent erosion flow underneath.
4. Fold and secure mat snugly into all transverse check slots.
5. Backfill and compact trenches and check slots after staking the mat in
bottom of trench (see Ground Fastening below).
6. Bury final terminal end as prescribed above.
7. Overlap roll ends by 3 feet (minimum) with upslope mat on top to prevent
uplift of mat end by water flow.
8. Overlap adjacent edges of mat by 3 inches (Minimum) and stake (see Ground
Fastening below).
GROUND FASTENING
Metal pins or wood stakes are recommended for anchoring mat to the ground
surface. Metal pins should be about 3/16 inch diameter steel with 1.5 inch
diameter steel washer secured at head of pin. Wood stakes should be 1" X 3"
nominal stock cut in a triangular shape. Stakes should be about 9 inches to 18
inches long, depending on soil density. Longer anchors are required for loose
soils.
Note that ground fasteners different from those mentioned here may function
adequately. Care must be taken to assure that fasteners hold mat securely at
the surface and have sufficient ground penetration to resist pullout.
1. Stake mat to ground on 3 to 5 foot centers. Add extra stakes at
depressions in ground surface where mat bridges over to assure ground
conformity.
2. Drive wood stakes to within 3 inches of ground surface. Do not drive flush
to surface. Steel or plastic pins should be driven flush to surface.
3. In all transverse terminal trenches and check slots, stake each mat at its
center and at overlapped edges before backfilling and compacting.
4. Stake overlaps longitudinally at 3 foot intervals.
SOIL GUARD
1. "Soil Guard" is a bonded fiber matrix erosion control system produced by
Weyerhaeuser.
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DATE:
PROJ. NO.:
DRAWN BY:
REVISIONS
TUBE FILE
SHEET NO.:
0 01,1 111111 1 1111111 111/1 0
4/\STt
No.
10302066
0 STATE OF
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DRAWING: 2308C803A
12/16/05
2308
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