C-502 SOIL EROSION AND SEDIMENT CONTROL MISCELLANEOUS DETAILS AND NOTES.pdf
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- Solicitation number
- W911WN25BA013
About this file
This document is a detailed engineering drawing (Sheet C-502) for soil erosion and sediment control, specifically focusing on erosion control blanket installation and road cross-section details for the Conemaugh River Lake Accumulated Sediment Dredging Project. The drawing provides comprehensive technical specifications for erosion control measures, including precise instructions for blanket placement, anchoring, stapling, and seeding requirements for both wetland and non-wetland areas.
The drawing includes specific guidance on topsoil placement (6 inches), seeding mixtures, application rates, and seasonal seeding windows (March 15 to June 1 and August 1 to October 15 for non-wetland areas, October 15 to May 15 for native portions of wetland areas). It also provides a typical aggregate surface road cross-section with geotextile fabric installation requirements, noting a minimum 12-inch overlap. The document is part of the solicitation W911WN25BA013 for the U.S. Army Corps of Engineers Pittsburgh District, supporting a dredging project with specific erosion control and site restoration specifications.
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NOTES:
SEED AND SOIL AMENDMENTS SHALL BE APPLIED ACCORDING TO THE RATES IN THE PLAN DRAWINGS
PRIOR TO INSTALLING THE BLANKET.
PROVIDE ANCHOR TRENCH AT TOE OF SLOPE IN SIMILAR FASHION AS AT TOP OF SLOPE.
SLOPE SURFACE SHALL BE FREE OF ROCKS, CLODS, STICKS, AND GRASS.
EROSION CONTROL BLANKET SHALL BE PLACED ON ANY GRADED SLOPED SURFACES OR STOCKPILES.
BLANKET SHALL HAVE GOOD CONTINUOUS CONTACT WITH UNDERLYING SOIL THROUGHOUT ENTIRE LENGTH. LAY BLANKET LOOSELY AND STAKE OR STAPLE TO MAINTAIN DIRECT CONTACT WITH SOIL. DO
NOT STRETCH BLANKET.
THE BLANKET SHALL BE STAPLED IN ACCORDANCE WITH THE MANUFACTURER'S RECOMMENDATIONS.
BLANKETED AREAS SHALL BE INSPECTED WEEKLY AND AFTER EACH RUNOFF EVENT UNTIL PERENNIAL VEGETATION IS ESTABLISHED TO A MINIMUM UNIFORM 70% COVERAGE THROUGHOUT THE BLANKETED AREA. DAMAGED OR DISPLACED BLANKETS SHALL BE RESTORED OR REPLACED WITHIN 4 CALENDAR DAYS.
BLANKET EDGES
STAPLED AND
OVERLAPPED
(4 IN. MIN.)
INSTALL BEGINNING OF ROLL
IN 6 IN. x 6 IN. ANCHOR
TRENCH, STAPLE, BACKFILL
AND COMPACT SOILSTARTING AT TOP OF
SLOPE, ROLL BLANKETS
IN DIRECTION OF WATER
FLOW
PREPARE SEED BED
(INCLUDING APPLICATION OF
LIME, FERTILIZER AND SEED)
PRIOR TO BLANKET
INSTALLATION
REFER TO MANUF.
RECOMMENDED STAPLING
PATTERN FOR STEEPNESS AND
LENGTH OF SLOPE BEING
BLANKETED
THE BLANKET
SHOULD NOT BE
STRETCHED; IT MUST
MAINTAIN GOOD SOIL
CONTACT
OVERLAP BLANKET ENDS 6 IN. MIN.
WITH THE UPSLOPE BLANKED
OVERLYING THE DOWNSLOPE
BLANKET (SHINGLE STYLE). STAPLE
SECURELY.
*IF A SPECIES IS UNAVAILABLE IN THIS MIX, SUBSTITUTE BY INCREASING THE PERCENTAGE OF OTHER ITEMS IN THE MIX.
6. Use only in extreme southeastern or extreme southwestern Pennsylvania. Serecia lespedeza is not well adapted to most of PA.
7. Do not mow shorter than 9 to 10 inches.
8. Seed mixtures containing crown vetch should not be used in areas adjacent to wetlands or stream channels due to the invasive nature of this species.
9. No invasive species will be applied on site.
4. Keep seeding rate to that recommended in table. These species have many seed per pound and are very competitive. To seed small quantities of small seeds such as weeping love grass and redtop, dilute with dry sawdust, sand, rice hulls, buckwheat hulls, etc.
5. Use for highway slopes and similar sites where the desired species after establishment is crownvetch.
6. Use only in extreme southeastern or extreme southwestern Pennsylvania. Serecia lespedeza is not well adapted to most of PA.
7. Do not mow shorter than 9 to 10 inches.
8. Seed mixtures containing crown vetch should not be used in areas adjacent to wetlands or stream channels due to the invasive nature of this species.
3. SEEDING OPERATIONS OF DISTURBED WETLANDS SHALL OCCUR ONCE
4. SEEDING ANY DISTURBED AREA OUTSIDE OF WETLAND AREAS SHALL BE AN APPROVED USACE MIX OR SHALL FOLLOW
THE SPECIFICATION BELOW:
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EROSION CONTROL BLANKET DETAIL
SEEDING NOTES:
1. SEEDING WITHIN WETLAND AREA SHALL BE AN APPROVED USACE MIX AND SHALL FOLLOW THE SPECIFICATIONS BELOW:
(WETLANDS - PERMANENT)
TOPSOIL PLACEMENT DEPTH: 6 IN
*SPECIES: SEE NOTE 2
% PURE LIVE SEED: SEE NOTE 2
APPLICATION RATE: 9 lb / 1000yd^2 or 45 lb / ACRE
FERTILIZER TYPE: SOIL TEST; DO NOT APPLY FERTILIZER IF SOIL TEST NOT AVAILABLE
FERTILIZER APPL. RATE: SOIL TEST; DO NOT APPLY FERTILIZER IF SOIL TEST NOT AVAILABLE
LIMING RATE: N/A
MULCH TYPE: N/A
MULCHING RATE: N/A
ANCHOR MATERIAL: EROSION CONTROL BLANKET
ANCHORING METHOD: PER MANUFACTURER'S RECOMMENDATION
RATE OF ANCHOR MATERIAL APPL.: PER MANUFACTURER'S RECOMMENDATION
SEEDING SEASON DATES: Nursery Crops Portion: Anytime; Native Portion: October 15 to May 15
2. SEEDING SPECIES AND % PURE LIVE SEED FOR WETLAND AREAS SHALL FOLLOW PUBLICATION 408. ADDITIONAL USACE APPROVED SEEDING MIX INCLUDE ERNMX-122 OR ERNMX-221. ALL OTHER SEEDING MIXES NEED TO BE APPROVED BY
PENNDOT PUBLICATION 408 TO DETERMINE ACCEPTABILITY.
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TOPSOIL PLACEMENT DEPTH: 6 IN.
*SPECIES: SEE TABLE 11.5
% PURE LIVE SEED: SEE TABLE 11.4 %
APPLICATION RATE: SEE TABLE 11.4 LB./ACRE
FERTILIZER TYPE: SEE TABLE 11.2 (X-X-X)
FERTILIZER APPL. RATE: SEE TABLE 11.2 LB./ACRE
LIMING RATE: N/A T./ACRE
MULCH TYPE: N/A
MULCHING RATE: N/A T./ACRE
ANCHOR MATERIAL: EROSION CONTROL BLANKET
ANCHORING METHOD: PER MANUFACTURER'S RECOMMENDATION
RATE OF ANCHOR MATERIAL APPL.: PER MANUFACTURER'S RECOMMENDATION LB./ACRE
SEEDING SEASON DATES: March 15 to June 1; August 1 to October 15
H2 NTS
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GEOTEXTILE FABRIC
(SEE NOTE)
AGGREGATE SURFACE MIN.
B2 NTS
TYPICAL ROAD CROSS SECTION
2% TYP
℄ ROAD
2% TYP
EXISTING SURFACE
ROAD WIDTH VARIES
SECTION 1
TYPICAL AGGREGATE SURFACE ROAD SECTION
A1 C-302
NOTES:
1. INSTALL PER MANUFACTURERS SPECIFICATION. GEOTEXTILE FABRIC WITH A MINIMUM OF 12" OVERLAP.
2. THIS DETAIL IS INTENDED FOR THE ACCESS ROAD AND PROPOSED TURNOUT SHOWN ON SHEET C-302
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