20171099 Ver 1_LINVILLE_RIVER_60%_REVISED_20180306

LINVILLE RIVER REACH 2 RESTORATION
6065 LINVILLE FALLS HWY, NEWLAND, NC 28657- AVERY COUNTY
PROJECT DIRECTORY
PROJECT OWNER NC FOREST SERVICE
BILL SWARTLEY
919.857.4856
[e-mail]
COORDINATOR RESOURCE INSTITUTE, INC.
CHARLES ANDERSON
336.830.0595
[e-mail]
ENGINEER JENNINGS ENVIRONMENTAL
GREG JENNINGS, PHD, PE
919.600.4790
[e-mail]
CONSTRUCTION NORTH STATE ENVIRONMENTAL
DARRELL WESTMORELAND
336.725.2010
[e-mail]
SHEET INDEX
TITLE SHEET
PROPOSED CROSS-SECTIONS
PROPOSED S&EC PLAN
PROPOSED PLAN AND PROFILE
PROPOSED VEGETATION PLAN
PROPOSED STRUCTURE DETAILS
1.0
2.0
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FOREST
SERVICE
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REVISED 60% PLANS -PERMITTING
SUBMITTED ON MARCH 7, 2018
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PLAN LEGEND
PROPOSED BANKFULL
PROPOSED CENTERLINE
— — — — —
PROPOSED INNER BERM
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LIMITS OF DISTURBANCE (LOD)
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SITE ACCESS ROADS / PATHS
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PROPOSED STAGING AREAS
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NATIVE RIFFLE
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CONSTRUCTION SCHEDULE
1. OBTAIN EROSION AND SEDIMENTATION PLAN APPROVAL, TROUT BUFFER
VARIANCE WAIVER, AND ALL OTHER APPLICABLE PERMITS.
1. NOTIFY INSPECTOR FROM ASHEVILLE REGIONAL OFFICE OF DEQ PRIOR TO
DISTURBANCE.
2. POST CERTIFICATE OF APPROVAL FOR LAND DISTURBANCE AT SITE.
3. INSTALL RAIN GAUGE AND PREPARE INSPECTION FORMS AS DESCRIBED
ABOVE.
4. FLAG THE WORK LIMITS AND STAKE OUT THE EXTENTS AND ELEVATIONS OF
THE PROJECT.
5. FLAG THE EXTENTS OF THE TROUT BUFFER IN AREAS WHERE NO LAND
DISTURBANCE WILL OCCUR.
6. LOCATE ALL UNDERGROUND UTILITIES WITHIN THE WORKSITE.
7. HOLD PRECONSTRUCTION MEETING PRIOR TO STARTING CONSTRUCTION.
8. INSTALL CONSTRUCTION ENTRANCES ACCESS ROADS AND SILT FENCE PER
THE ATTACHED PLAN SHEETS AND DETAILS.
9. INSPECT EROSION AND SEDIMENTATION CONTROL PRACTICES DAILY AND
AFTER SIGNIFICANT RAINFALL EVENTS. MAKE NEEDED REPAIRS IMMEDIATELY
10. STOCKPILE MATERIALS FOR STREAM WORK (E.G., BOULDERS, LOGS, WOODY
DEBRIS) OUTSIDE OF THE TROUT BUFFER (AT LEAST 25 FEET FROM THE TOP
OF BANK).
11. TO THE EXTENT PRACTICABLE, WORK ITERATIVELY FROM UPSTREAM TO
DOWNSTREAM THROUGHOUT THE PROJECT REACHES. CONTRACTOR SHALL
LIMIT STREAMBANK DISTURBANCE TO AREAS THAT CAN BE COMPLETED AND
STABILIZED DURING ONE DAY OF WORK. DURING EACH ZONE OF
DISTURBANCE, FOLLOW THE FOLLOWING STEPS:
• AS NEEDED TO IMPLEMENT BANK GRADING, REMOVE VEGETATION. DO
NOT REMOVE HEALTHY, NATIVE VEGETATION FROM AREAS WHERE NO
GRADING OR STRUCTURE INSTALLATION WILL OCCUR. STOCKPILE
VEGETATION FOR REPLANTING, AS APPROPRIATE.
• AS SHOWN ON PLANS, REALIGN CHANNEL. ENSURE CONSTRUCTED
SLOPES ARE GRADED AT A 3:1 SLOPE OR FLATTER, UNLESS DIRECTED
OTHERWISE BY THE FIELD ENGINEER. WHEN POSSIBLE, PERFORM WORK
FROM STREAMBANKS IN ORDER TO MINIMIZE TIME SPENT WORKING IN
THE CHANNEL.
• INSTALL IN -STREAM STRUCTURES, BEDFORM FEATURES, AND
STREAMBANK PROTECTION PER THE PLANS. WHEN POSSIBLE, PERFORM
WORK FROM STREAMBANKS IN ORDER TO MINIMIZE TIME SPENT
WORKING IN THE CHANNEL.
• INSTALL COIR STREAMBANK MATTING AND TEMPORARY SEEDING ON ALL
DISTURBED SURFACES ON THE STREAMBANK UP TO THE TOP OF BANK.
12. ANY AREA DISTURBED WITHIN 25 FEET FROM THE TOP OF THE STREAM BANK
SHALL BE PROVIDED WITH TEMPORARY GROUND COVER SPECIFIED IN THE
VEGETATION PLAN WITHIN 10 CALENDAR DAYS, UNLESS SUPERSEDED BY THE
CONDITIONS OF GENERAL STORMWATER PERMIT NCG 010000.
13. ONCE SITE IS STABILIZED, REMOVE AND DISPOSE OF ALL
NON -BIODEGRADABLE EROSION CONTROL DEVICES.
14. NOTIFY INSPECTOR FROM ASHEVILLE REGIONAL OFFICE OF DEQ AFTER
STABILIZATION.
15. WHEN APPROPRIATE, INSTALL PERMANENT VEGETATION PER PLANTING
PLANS.
E&SC PLAN
DURING PROJECT IMPLEMENTATION, BMPS/CONSERVATION MEASURES WILL BE
IMPLEMENTED TO REDUCE SEDIMENTATION INTO THE LINVILLE RIVER. EFFORTS
WILL BE MADE TO LIMIT AND EXPEDITE EQUIPMENT TIME IN THE STREAM CHANNEL.
WHEN POSSIBLE, WORK WILL OCCUR FROM THE
STREAMBANKS. THE DESIGN ATTEMPTS TO MINIMIZE SEDIMENTATION AND OTHER
POTENTIALLY NEGATIVE IMPACTS THROUGH THE FOLLOWING PRACTICES:
• THE CONTRACTOR WILL BE REQUIRED TO STAGE AND STORE EQUIPMENT
AND MATERIALS OUTSIDE OF THE TROUT BUFFERS (25 LINEAR FEET FROM
TOP OF BANKS).
• EQUIPMENT WILL BE WELL-MAINTAINED, CLEANED PRIOR TO
MOBILIZATION, AND CHECKED DAILY FOR LEAKS OF PETROLEUM
PRODUCTS.
• FUELING WILL BE PERFORMED IN A CONTAINED AREA OUTSIDE OF THE
TROUT BUFFER.
• THE CONTRACTOR WILL BE REQUIRED TO STAGE WORK SUCH THAT
DISTURBED AREAS WILL BE STABILIZED IN PHASES WITH SEEDING, MULCH
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100 FT X 100 FT STAGING AREA
WITH SILT FENCE ON RIVER SIDE
AND BIODEGRADABLE (COIR) EROSION CONTROL MATTING (WHERE
APPROPRIATE).
• ALL TREES, UTILITIES AND OTHER SITE FEATURES WILL BE PROTECTED
UNLESS MARKED FOR REMOVAL OR RELOCATION.
• ALL WORK ADJACENT TO STREAM WATERS WILL BE CONDUCTED IN A DRY
WORK AREA TO THE EXTENT POSSIBLE.
• TO THE EXTENT POSSIBLE, CONSTRUCTION WILL BE TIMED TO OCCUR
DURING TIMES OF LOW FLOW.
• APPROPRIATELY SIZED EQUIPMENT WILL BE UTILIZED TO PREVENT
EXCESSIVE COMPACTING AND MINIMIZE CLEARING.
• CONSTRUCTION SCHEDULING AND STAGING WILL BE TIMED TO MINIMIZE
THE AMOUNT OF TIME SPENT WORKING IN THE STREAM CHANNEL.
SILT FENCE
PRIOR TO ANY SOIL DISTURBANCE, APPROXIMATELY 500 FEET OF WOVEN 4 OZ.
SILT FENCE WITH PREATTACHED METAL OR HARDWOOD STAKES AT 4 FOOT
INTERVALS WILL BE INSTALLED ON THE SITE AS INDICATED ON THE ATTACHED
PLAN SHEETS AND THE DETAIL BELOW. SILT FENCE WILL BE LOCATED ALONG THE
DOWNSTREAM SIDE OF THE STAGING AREAS. AT THE END OF THE PROJECT, WHEN
ALL DISTURBED AREAS HAVE BEEN STABILIZED, ALL SILT FENCE WILL BE
REMOVED. MATERIAL SPECIFICATIONS, INSTALLATION PROCEDURES, AND
MAINTENANCE SHALL CONFORM TO SECTION 6.62 OF THE NORTH CAROLINA
SEDIMENT CONTROL PLANNING AND DESIGN MANUAL, INCLUDING THE
CONSTRUCTION DETAIL.
SITE ACCESS AND STAGING
SITE ACCESS WILL BE VIA AN EXISTING HARDENED GRAVEL DRIVE OFF OF LINVILLE
FALL HIGHWAY, AS NOTED WITHIN THE ENGINEERING PLANS. ACCESS WITHIN THE
PROJECT WILL UTILIZE EXISTING DIRT AND GRAVEL ROADS. TWO STAGING AREAS
FOR EQUIPMENT AND MATERIALS WILL BE CREATED WITHIN AREAS THAT ARE
CURRENTLY UNVEGETATED. ONE STAGING AREA WILL BE LOCATED NEAR THE
UPSTREAM END OF THE PROJECT; THE OTHER WILL BE NEAR THE DOWNSTREAM
END. BOTH WILL BE WHOLLY LOCATED OUTSIDE OF THE TROUT
roads. SILT FENCE WILL BE INSTALLED ALONG THE DOWNSTREAM EDGES OF EACH
STAGING AREA.
STREAMBANK MATTING
NORTH AMERICAN GREEN C125BN (OR EQUIVALENT) MATTING WILL BE USED
ALONG NEWLY GRADED STREAM BANK SECTIONS. MATTING WILL NOT CONTAIN
SYNTHETIC (PLASTIC) MATERIALS. MATTING WILL BE INSTALLED BEGINNING AT THE
TOE OF STREAMBANK TO THE TOP OF THE BANK AND WILL EXTEND ABOVE THE
TOP OF BANK BY A MINIMUM OF ONE FOOT. THE UPPER EDGE OF MATTING WILL BE
TRENCHED IN AND STAKED AS SPECIFIED IN THE PLANS. A COMBINATION OF
12 -INCH AND 24 -INCH WOODEN STAKES WILL BE USED TO SECURE THE MATTING IN
PLACE.
DUST CONTROL
EXPOSED SOILS ON LEVEL SURFACES WILL BE KEPT MOIST DURING DRY
CONDITIONS TO MINIMIZE THE POTENTIAL FOR WIND EROSION AND DUST
ACCUMULATION.
STORMWATER
THE RIVER RESTORATION PROJECT WILL NOT CREATE ADDITIONAL POINT
SOURCES OF STORMWATER. THE INTENT OF THE PROJECT IS TO IMPROVE
OVERALL WATER QUALITY IN THE LINVILLE RIVER BY STABILIZING ERODING
STREAMBANKS, PROVIDING FLOODPLAIN STORAGE, AND PROMOTING
APPROPRIATE RIPARIAN
VEGETATION. ALL CONSTRUCTION ACTIVITIES WILL CONFORM TO NORTH
CAROLINA GENERAL STORMWATER PERMIT NCG 10000.
SPECIFICALLY:
• SOIL STABILIZATION SHALL BE ACHIEVED ON ANY AREA OF A SITE WHERE
LAND -DISTURBING ACTIVITIES HAVE TEMPORARILY OR PERMANENTLY
CEASED ACCORDING TO THE FOLLOWING SCHEDULE: 1) ALL PERIMETER
DIKES, SWALES, DITCHES, PERIMETER SLOPES AND ALL SLOPES STEEPER
THAN 3 HORIZONTAL TO 1 VERTICAL (3: 1) SHALL BE PROVIDED
TEMPORARY OR PERMANENT STABILIZATION WITH GROUND COVER AS
SOON AS PRACTICABLE BUT IN ANY EVENT WITHIN 7 CALENDAR DAYS
FROM THE LAST LAND -DISTURBING ACTIVITY.
• ALL OTHER DISTURBED AREAS SHALL BE PROVIDED TEMPORARY OR
PERMANENT STABILIZATION WITH GROUND COVER AS SOON AS
20 FT WIDE
ACCESS PATH
PRACTICABLE BUT IN ANY EVENT WITHIN 14 CALENDAR DAYS FROM THE
LAST LAND -DISTURBING ACTIVITY.
ALL INSPECTION AND REPORTING WILL CONFORM TO NORTH CAROLINA GENERAL
STORMWATER PERMIT NCG 010000. SPECIFICALLY, MINIMUM SELF -INSPECTION
AND REPORTING REQUIREMENTS ARE AS
FOLLOWS:
A. A RAIN GAUGE SHALL BE MAINTAINED IN GOOD WORKING ORDER ON THE SITE.
B. A WRITTEN RECORD OF THE DAILY RAINFALL AMOUNTS SHALL BE RETAINED
AND ALL RECORDS SHALL BE MADE AVAILABLE TO DIVISION OF WATER
QUALITY OR AUTHORIZED AGENT UPON REQUEST. UEST. IF NO DAILY RAIN GAUGE Q
OBSERVATIONS ARE MADE DURING WEEKEND OR HOLIDAY PERIODS, AND NO
INDIVIDUAL -DAY RAINFALL INFORMATION IS AVAILABLE, THE CUMULATIVE RAIN
MEASUREMENT FOR THOSE UN -ATTENDED DAYS WILL DETERMINE IF A SITE
INSPECTION IS NEEDED. (NOTE: IF NO RAINFALL OCCURRED, THE PERMITTEE
MUST RECORD "ZERO".)
C. EROSION AND SEDIMENTATION CONTROL MEASURES SHALL BE INSPECTED TO
ENSURE THAT THEY ARE OPERATING CORRECTLY. INSPECTION RECORDS
MUST BE MAINTAINED FOR EACH INSPECTION EVENT AND FOR EACH
MEASURE. AT A MINIMUM, INSPECTION OF MEASURES MUST OCCUR AT THE
FREQUENCY INDICATED 1) ALL EROSION AND SEDIMENTATION CONTROL
MEASURES MUST BE INSPECTED BY OR UNDER THE DIRECTION OF THE
PERMITTEE AT LEAST ONCE EVERY SEVEN CALENDAR DAYS, AND 11) ALL
EROSION AND SEDIMENT CONTROL MEASURES MUST BE INSPECTED BY OR
UNDER THE DIRECTION OF THE PERMITTEE WITHIN 24 HOURS AFTER ANY
STORM EVENT OF GREATER THAN 0.50 INCHES OF RAIN PER 24 HOUR PERIOD
D. INSPECTIONS ARE ONLY REQUIRED TO BE MADE DURING NORMAL BUSINESS
HOURS. WHEN ADVERSE WEATHER CONDITIONS WOULD CAUSE THE SAFETY
OF THE INSPECTION PERSONNEL TO BE IN JEOPARDY, THE INSPECTION CAN
BE DELAYED UNTIL IT IS DEEMED SAFE TO PERFORM THESE DUTIES (TIMES
WHEN INSPECTIONS WERE DELAYED BECAUSE OF SAFETY ISSUES SHOULD BE
NOTED IN THE INSPECTION RECORD.) IF THE INSPECTION CANNOT BE DONE
ON THAT DAY, IT MUST BE COMPLETED ON THE FOLLOWING BUSINESS DAY.
E. TWENTY-FOUR HOUR REPORTING FOR VISIBLE SEDIMENT DEPOSITION: 1) THE
PERMITTEE SHALL REPORT TO THE DIVISION OF WATER QUALITY CENTRAL
OFFICE OR THE APPROPRIATE REGIONAL OFFICE ANY VISIBLE SEDIMENT
BEING DEPOSITED IN ANY STREAM OR WETLAND OR ANY NONCOMPLIANCE
WHICH MAY ENDANGER HEALTH OR THE ENVIRONMENT. ANY INFORMATION
SHALL BE PROVIDED ORALLY OR ELECTRONICALLY WITHIN 24 HOURS FROM
THE TIME THE PERMITTEE BECAME AWARE OF THE CIRCUMSTANCES. II) A
WRITTEN SUBMISSION SHALL BE PROVIDED TO THE APPROPRIATE REGIONAL
OFFICE OF THE DIVISION OF WATER QUALITY WITHIN 5 DAYS OF THE TIME THE
PERMITTEE BECOMES AWARE OF THE CIRCUMSTANCES. THE WRITTEN
SUBMISSION SHALL CONTAIN A DESCRIPTION OF THE SEDIMENT DEPOSITION
AND ACTIONS TAKEN TO ADDRESS THE CAUSE OF THE DEPOSITION. THE
DIVISION OF WATER QUALITY STAFF MAY WAIVE THE REQUIREMENT FOR A
WRITTEN REPORT ON A CASE-BY-CASE BASIS.
F. RECORDS OF INSPECTIONS MADE DURING THE PREVIOUS 30 DAYS SHALL
REMAIN ON THE SITE AND AVAILABLE FOR AGENCY INSPECTORS AT ALL TIMES
DURING NORMAL WORKING HOURS, UNLESS THE DIVISION OF WATER QUALITY
PROVIDES A SITE-SPECIFIC EXEMPTION BASED ON UNIQUE SITE CONDITIONS
THAT MAKE THIS REQUIREMENT NOT PRACTICAL. OLDER RECORDS MUST BE
MAINTAINED FOR A PERIOD OF THREE YEARS AFTER PROJECT COMPLETION
AND MADE AVAILABLE UPON REQUEST THE RECORDS MUST PROVIDE THE
DETAILS OF EACH INSPECTION INCLUDING OBSERVATIONS, AND ACTIONS
TAKEN IN ACCORDANCE WITH THIS PERMIT. THE PERMITTEE SHALL RECORD
THE REQUIRED RAINFALL AND MONITORING OBSERVATIONS ON THE
INSPECTION RECORD FORM PROVIDED BY THE DIVISION OR A SIMILAR
INSPECTION FORM THAT IS INCLUSIVE OF ALL OF THE ELEMENTS CONTAINED
IN THE DIVISION'S FORM. USE OF ELECTRONICALLY -AVAILABLE RECORDS, IN
LIEU OF THE REQUIRED PAPER COPIES FOR INSPECTION WILL BE ALLOWED IF
SHOWN TO PROVIDE EQUAL ACCESS AND UTILITY AS THE HARD -COPY
RECORDS. INSPECTION RECORDS MUST INCLUDE, AT A MINIMUM, THE
FOLLOWING: 1) IDENTIFICATION OF THE CONTROL MEASURES INSPECTED, 2)
DATE AND TIME OF THE INSPECTION, 3) NAME OF THE PERSON PERFORMING
THE INSPECTION, 4) INDICATION OF WHETHER THE MEASURES WERE
OPERATING PROPERLY, 5) DESCRIPTION OF MAINTENANCE NEEDS FOR THE
MEASURE, 6) CORRECTIVE ACTIONS TAKEN (7) DATE OF ACTIONS TAKEN, AS
WELL AS THE DATE AND AMOUNTS OF RAINFALL RECEIVED. II) VISIBLE
SEDIMENTATION FOUND OUTSIDE THE SITE LIMITS: INSPECTION RECORDS
MUST INCLUDE: 1) AN EXPLANATION AS TO THE ACTIONS TAKEN TO CONTROL
USE EXISTING GRAVEL DRIVE FOR ACCESS
TO STAGING AREAS AND RIVER
SITE ACCESS PROVIDED BY EXISTING GRAVEL
DRIVE OFF LINVILLE FALLS HIGHWAY
FUTURE RELEASES, 2) ACTIONS TAKEN TO CLEAN UP OR STABILIZE THE
SEDIMENT THAT HAS LEFT THE SITE LIMITS AND 3) THE DATE OF ACTIONS
TAKEN. III) VISIBLE SEDIMENTATION FOUND IN STREAMS OR WETLANDS: ALL
INSPECTIONS SHOULD INCLUDE EVALUATION OF STREAMS OR WETLANDS
ONSITE OR OFFSITE (WHERE ACCESSIBLE) TO DETERMINE IF VISIBLE
SEDIMENTATION HAS OCCURRED.
G. IF THE DISCHARGE FROM A SITE RESULTS IN AN INCREASE IN VISIBLE STREAM
TURBIDITY, INSPECTION RECORDS MUST RECORD THAT EVIDENCE AND
ACTIONS TAKEN TO REDUCE SEDIMENT CONTRIBUTIONS. "CLEAN"
STORMWATER RUNNING ONTO THE PROJECT SITE FROM SURROUNDING
UNDISTURBED AREAS WILL BE HANDLED USING THE FOLLOWING
APPROACHES:
• DURING WORK IN AND NEAR THE CHANNEL, TEMPORARY DIVERSIONS
WILL BE INSTALLED AS SITE CONDITIONS REQUIRE TO PREVENT
STORMWATER FROM ENTERING UNSTABILIZED CONSTRUCTION AREAIS
DUE TO IRREGULAR TOPOGRAPHY, MATURE FORESTED VEGETATION, AND
MULTIPLE EXISTING RECEIVING WATERS, THE AREA THAT COULD
CONTRIBUTE STORMWATER TO THE PROJECT SITE IS AREAS AS A
RESULT, TEMPORARY DIVERSIONS WILL NOT BE REQUIRED AROUND THE
ENTIRE SITE. HOWEVER, WHEN THE POTENTIAL EXISTS FOR "CLEAN"
STORMWATER TO RUN ON TO AN AREA OF ACTIVE CONSTRUCTION, A
TEMPORARY DIVERSION WILL BE CONSTRUCTED AT AN APPROPRIATE
LOCATION.
• TEMPORARY DIVERSIONS SHALL CONSIST OF A TEMPORARY EARTHEN
DIVERSION DIKE, BUILT TO SPECIFICATIONS IN SECTION 6.20 OF THE
NORTH CAROLINA SEDIMENT CONTROL PLANNING AND DESIGN MANUAL,
INCLUDING THE CONSTRUCTION DETAIL BELOW. "CLEAN" STORMWATER
DIVERTED BY THE DIKE SHALL BE ROUTED TO A STABLE AREA OF THE
LINVILLE RIVER OR A TRIBUTARY, AS APPROPRIATE. AS PART OF FINAL
GRADING, THE DIVERSION DIKE WILL BE REMOVED AND GRADED. TO FINAL
DESIGN CONTOURS, THEN STABILIZED WITH VEGETATION.
SOLID WASTE
IT IS NOT ANTICIPATED THAT EXCAVATION FOR THIS PROJECT WILL UNEARTH ANY
SOLID WASTE. IN THE CASE THAT ANY SOLID WASTE IS INADVERTENTLY
EXCAVATED, THE FOLLOWING PROCEDURES WILL BE FOLLOWED:
• STOCKPILE SOLID WASTE OUTSIDE OF TROUT BUFFER.
• INSTALL SEDIMENT FENCE AROUND TEMPORARY STOCKPILE AS NEEDED
TO PREVENT SEDIMENT FROM WASHING OFF OF WASTE AND ENTERING
SURROUNDING AREAS.
• ARRANGE FOR WASTE DISPOSAL WITHIN 14 CALENDAR DAYS IN
ACCORDANCE WITH LOCAL AND SOLID WASTE REGULATIONS.
• AVERY COUNTY SANITATION DEPARTMENT: 828-737-5420
• NC DENR SOLID WASTE SECTION: 828-296-4702
• REMOVE SILT FENCE AND GRADE ALL AREAS TO FINAL DESIGN.
MAINTENANCE OF E&SC MEASURES
ALL EROSION CONTROL AND SEDIMENTATION MEASURES WILL BE INSPECTED
DAILY AND AFTER SIGNIFICANT RAIN EVENTS BY THE ON SITE ENGINEER AND THE
CONTRACTOR. THE CONTRACTOR WILL ASSURE THAT ALL INSTALLATIONS ARE
FUNCTIONING PROPERLY AT THE END OF EACH WORK DAY. INSPECTION
REQUIREMENTS, AS DETAILED IN THE STORMWATER SECTION, WILL BE
FOLLOWED. ONCE THE SITE IS STABILIZED, ALL NON -BIODEGRADABLE EROSION
CONTROL MEASURES WILL BE REMOVED AND PROPERLY DISPOSED OF BY THE
CONTRACTOR.
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PLANNING AND DESIGN MANUAL
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LINVILLE RIVER REACH 2 - PROPOSED RIFFLE CROSS-SECTION (TYP.
BANKFULL BENCH
PROPOSED 700 GRAM COIR EROSION
CONTROL MATTING, SEE DETAIL
POINT BAR
BKF WSE
INNER BERM
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WIDTH VARIES PER PLAN
68.6 FT
29.8 FT
4.8 FT --1 1 1.4 FT
PROPOSED CENTERLINE ALIGNMENT
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INNER BERM
LINVILLE RIVER REACH 2 - PROPOSED POOL CROSS-SECTION (TYP.
PROPOSED 700 GRAM COIR EROSION
CONTROL MATTING, SEE DETAIL
WIDTH VARIES PER PLAN
82.3 FT
PROPOSED CENTERLINE ALIGNMENT
12.0 FT
BANKFULL BENCH
PROPOSED RIFFLE
SUMMARY
PARAMETER
DESIGN VALUE
QBKF
1260 CFS
ABKF
235 FT
W BKF
68.6 FT
DBKF
3.4 FT
DMAX
4.8 FT
WID
20.0
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2.0-3.0
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1.4
VBKF
5.4 FT/S
TBKF
0.9 PSF
BANKFULL BENCH
PROPOSED POOL
SUMMARY
PARAMETER
DESIGN VALUE
APOOL
516 FT
W POOL
82.3 FT
DPOOL
6.3 FT
DMPOOL
12.0 FT
APOOLIABKF
2.2
W POOLIW BKF
1.2
DMPOOLIDBKF
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NOTES
NOT TO SCALE
1.
THE NATIVE RIFFLE IS A STREAM AND RIVER RESTORATION DESIGN FEATURE THAT INCORPORATES
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ALL SELECT RIFFLE MATERIAL SHALL BE NATIVE MATERIAL AVAILABLE ONSITE AND MEETS THE THE NA
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THE GRAVEL AND COBBLE SUBSTRATE USED FOR THIS DESIGN FEATURE SHOULD BE PREFERENTIALLY
EXTEND RIFFLE EXTEND RIFFLE
HARVESTED FROM THE EXISITING CHANNEL AND OTHER DESIGNATED MINING AREAS ONSITE.
SUBSTRATE INTO
RIFFLE LENGTH VARIES
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SORTING AND SIEVING OF THE HARVESTED RIFFLE SUBSTRATE IS INCIDENTAL TO THE CONSTRUCTION OF
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FOR INSTALLATION, THE CONTRACTOR SHALL OVER EXCAVATE THE LENGTH OF THE RIFFLE, INSTALL 700
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GRAM COIR FIBER EROSION CONTROL MATTING, KEY MATTING INTO THE RIFFLE TRENCH AND BACKFILL
PER PLAN
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P.T. AND P.C. STATIONS AND ELEVATIONS ARE INCLUDED IN THE PROPOSED PLAN AND PROFILE SHEETS.
9.
SELECT RIFFLE MATERIAL DEPTH SHALL BE AT LEAST 2.5 TIMES THE D100 (MM) SPECIFIED BY THE ENGINEER.
10.
SELECT RIFFLE MATERIAL WILL BE PLACED AT A UNIFORM THICKNESS.
11.
1BANKFULLSTAGE
THE SELECT RIFFLE MATERIAL WILL BE PLACED SUCH THAT, IN CROSS-SECTION, ITS LOWEST ELEVATION
OCCURS IN THE CENTER OF THE CHANNEL AS PER THE DETAIL.
12.
SELECT RIFFLE MATERIAL SHALL BE COMPACTED USING TRACK EQUIPMENT OR AN EXCAVATOR BUCKET
STREAMBANK TOE OF SLOPE
SUCH THAT FUTURE SETTLEMENT OF THE MATERIAL IS KEPT TO A MINIMUM.
13.
THE SURFACE OF THIS STRUCTURE SHALL BE FINISHED TO A SMOOTH AND COMPACT SURFACE IN
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ELEVATIONS INDICATED.
14.
RE -DRESSING OF CHANNEL AND BANKFULL BENCH/FLOODPLAIN WILL LIKELY BE REQUIRED FOLLOWING
INSTALLATION OF IN -STREAM STRUCTURES AND SHALL BE CONSIDERED INCIDENTAL TO CONSTRUCTION.
15.
SEE TYPICAL RIFFLE CROSS SECTION FOR DIMENSIONS.
NATIVE RIFFLE
DETAILED PLAN
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PER PROFILE
GLIDE
BANKFULL WSE
SELECT RIFFLE SUBSTRATE
MATERIAL PER NOTES /
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1. THE BOULDER CROSS -VANE IS A DESIGN FEATURE USED TO CONTROL GRADE IN HIGH IN GRADIENT REACHES OR
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TOWARDS THE STREAM BANK, EVENTUALLY KEYING INTO THE BANK AT AN ELEVATION HIGHER THAN THE SILL
BOULDERS.
2. ALL BOULDERS USED FOR THE OFFSET BOULDER STEP SHALL BE STRUCTURAL STONE, CUBICAL OR RECTANGULAR
IN SHAPE. THE ENGINEER MUST APPROVE THE USE OF BOULDERS THAT MAY BE AVAILABLE ONSITE.
3. DIMENSIONS AND SLOPES OF STRUCTURES DESCRIBED IN THE DETAIL MAY BE ADJUSTED BY DESIGN ENGINEER TO
FIT CONDITIONS ONSITE.
4. CONTRACTOR WILL BE REQUIRED TO FIT BOULDERS TOGETHER TIGHTLY.
5. GAPS BETWEEN BOULDERS SHALL BE MINIMIZED BY FITTING BOULDERS TOGETHER AND PLUGGING WITH NC DOT
CLASS A AND SELECT MATERIAL OR CHINKING STONE APPROVED BY DESIGN ENGINEER, AND LINING WITH FILTER
FABRIC.
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0.5 FT.
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BOULDER TO THE FINISHED GRADE ELEVATION AND SHALL BE PLACED THE ENTIRE LENGTH OF THE STRUCTURE.
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1. THE LOG J -HOOK WITH BOULDERS IS A DESIGN FEATURE USED TO PROVIDE ENERGY DISSIPATION, FLOW
DIRECTION CONTROL AND TO REDUCE NEAR BANK STRESS. THIS STRUCTURE WILL ALSO ENCOURAGE POOL
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LOG VANE ARM EXTENDS UP AND TOWARDS THE OUTSIDE STREAM BANK, EVENTUALLY KEYING INTO THE BANK AT
AN ELEVATION HIGHER THAN THE SILL BOULDERS.
2. ALL BOULDERS USED FOR THE BOULDER SILL SHALL BE STRUCTURAL STONE, CUBICAL OR RECTANGULAR IN
SHAPE. BOULDERS AVAILABLE ONSITE MAY BE USED IF APPROVED BY THE ENGINEER.
3. DIMENSIONS AND SLOPES OF STRUCTURES DESCRIBED IN THE DETAIL MAY BE ADJUSTED BY DESIGN ENGINEER TO
FIT CONDITIONS ONSITE.
4. CONTRACTOR WILL BE REQUIRED TO FIT LOGS AND BOULDERS TOGETHER TIGHTLY. ALL LOGS AND BOULDERS
SHALL BE INSTALLED WITH FOOTERS.
5. HEADER BOULDERS SHALL HAVE 2.0 FT - 3.0 FT GAPS BETWEEN EACH BOULDER TO MAINTAIN SEDIMENT
TRANSPORT FUNCTIONS AND FISH PASSAGE.
6. GAPS BETWEEN LOGS AND FOOTER BOULDERS SHALL BE MINIMIZED BY FITTING BOULDERS TOGETHER AND
PLUGGING WITH NC DOT CLASS A, WOODY DEBRIS AND SELECT MATERIAL OR CHINKING STONE APPROVED BY
DESIGN ENGINEER, AND LINING WITH FILTER FABRIC.
7. THE LOG VANE SHALL EXTEND INTO THE OUTSIDE STREAMBANK AND STREAMBED A MINIMUM OF 15.0 FT ON EACH
END.
8. THE BOULDER SILL SHALL EXTEND A MINIMUM OF 15.0 FT INTO THE INSIDE STREAM BANK.
9. BOULDERS SHALL BE 3.0 FT X 4.0 FT X 2.0 FT +/- 0.5 FT. MINIMUM LOG DIAMETER IS 2.0 FT.
10. NON -WOVEN GEOTEXTILE SHALL BE PLACED ON THE UPSTREAM SIDE OF THE STRUCTURE TO PREVENT WASHOUT
OF SEDIMENT THROUGH FOOTER BOULDER GAPS. FILTER FABRIC SHALL EXTEND FROM THE BOTTOM OF THE
FOOTER BOULDER TO THE FINISHED GRADE ELEVATION AND SHALL BE PLACED THE ENTIRE LENGTH OF THE
STRUCTURE.
HEADER LOG
EXTEND LOG INTO STREAMBANK
MINIMUM 15.0 FT.
KEY LOG INTO STREAM BANK @
3 BKF STAGE
PROPOSED BANKFULL WSE
— — — — — — — — — — --
LOG SLOPE = 2 - 4%
FOOTER LOG
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BANKFULL STAGE
SOIL GEOLIFTS
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LAYER OF LIVE
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TOE WOOD REVETMENT WITH SOIL GEOLIFT
DETAILED PLAN
ANCHOR GEOTEXTILE FABRIC
IN 6" DEEP TRENCH
SOIL BACKFILL (TYP.)
211 x 211 x 1811
WOOD STAKE (TYP.) /
UNDISTURBED GROUND
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EXCAVATION �
LIMITS
BANKFULL STAGE
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BRUSH TOE
PROTECTION
LIVE STAKES SPACING = 2.0 FT O.C.
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TOE WOOD REVETMENT WITH SOIL GEOLIFT
DETAILED PROFILE - SECTION A - A'
TRANSITION GEOLIFTS
INTO RIVER BANK
NOT TO SCALE
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FINE WOODY MATERIAL
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TOE WOOD REVETMENT WITH SOIL GEOLIFT
NOTES
1. COARSE WOODY DEBRIS SHALL CONSIST OF LOGS, ROOTWADS, AND LARGE BRANCHES NOT SUITABLE FOR
CONSTRUCTION OF LOG STRUCTURES. ALL MATERIALS ARE TO BE APPROVED BY THE ENGINEER.
2. COARSE WOODY DEBRIS SHALL BE CONSTRUCTED WITH THE LARGEST MATERIAL PLACED FIRST. NO LOGS
SHALL BE PLACED PARALLEL TO THE FLOW OF WATER, UNLESS DIRECTED BY THE ENGINEER. LOGS SHALL
BE PLACED IN A CROSSING PATTERN OR WEAVE SUCH THAT EACH LOG IS ANCHORED BY ANOTHER LOG.
3. SMALL/FINE WOODY DEBRIS SHALL CONSIST OF MEDIUM TO SMALL LIMBS, BRANCHES, BUSHES, AND/OR
LOGS. INVASIVE SPECIES SHALL NOT BE USED.
4. SMALL/FINE WOODY DEBRIS SHALL BE PLACED ABOVE THE COARSE WOODY DEBRIS WITH THE LARGEST
MATERIAL BEING PLACED FIRST AND THE SMALLEST MATERIAL PLACED LAST.
5. ALL WOODY DEBRIS SHALL BE COMPACTED WITH THE EXCAVATOR BUCKET IN ORDER TO REDUCE THE
PRESENCE OF VOIDS IN THE SMALL/FINE WOODY DEBRIS LAYER.
6. THE HORIZONTAL LOCATIONS OF ALL WOODY DEBRIS ARE LOCATED ON THE PLAN AND PROFILE SHEETS
AND WILL BE PROVIDED TO THE CONTRACTOR AS A 2004 FORMAT DWG FILE AND LN3 FILE. NO LOCATIONS
OF WOODY DEBRIS SHALL VARY FROM THE PLAN LOCATIONS WITHOUT DIRECTION FROM THE ENGINEER.
7. GRAVEL LEVELING BASE SHALL BE INSTALLED ABOVE THE HIGHEST ELEVATION OF THE WOODY DEBRIS
BEFORE THE SOIL LIFTS ARE INSTALLED.
8. THE SOIL BACKFILL USED FOR LIFTS AND TOPSOIL USED FOR LAYERING WITH THE LIVE
BRANCHES SHALL BE FREE OF ANY LARGE ROOTS OR WOODY DEBRIS AND SHALL GENERALLY BE
FREE FROM ANY GRAVEL OR COBBLE MATERIAL.
9. SOIL BACKFILL SHALL BE COMPACTED SUCH THAT FUTURE SETTLING WILL BE KEPT TO A
MINIMUM; YET, NOT SUCH THAT THE UNDERLYING BRUSH IS DISPLACED OR DAMAGED.
10. THE TOP OF THE BACKFILL FOR THE FIRST LIFT SHALL BE SLOPED AT APPROXIMATELY 5% AWAY
FROM THE STREAM.
11. PLACE A LAYER OF TOPSOIL AND LIVE BRANCHES ON TOP OF EACH SOIL LIFT SUCH THAT
APPROXIMATELY 6 INCHES TO 1 FOOT OF EACH LIVE BRANCH WILL BE EXPOSED AND THE
REMAINDER (2' TO 4') OF EACH LIVE BRANCH WILL BE COVERED BY THE NEXT SOIL LIFT.
12. LIVE BRANCHES SHALL BE OF THE SPECIES SPECIFIED FOR LIVE STAKES OR APPROVED BY THE
ENGINEER.
13. PLACE A LAYER OF 6.5 FEET WIDE GEOCOIR DEKOWE 700 EROSION CONTROL BLANKET, OR
EQUIVALENT, ON TOP OF THE TOPSOIL AND LIVE BRANCHES SUCH THAT 2.5 FEET OF THE
BLANKET WILL BE BURIED BELOW THE NEXT SOIL LIFT. ALLOW THE REMAINING 4.5 FEET OF
BLANKET TO HANG OVER THE PRECEDING SOIL LIFT OR COIR FIBER LOGS.
14. PLACE A LAYER OF 6.5 FEET WIDE NON -WOVEN COIR MATTING OVER THE EROSION CONTROL
BLANKET TO THE SAME LIMITS.
15. SOIL CAN BE COMPACTED BY STACKING A PIECE OF 2 X 6 SAWN LUMBER EDGEWAYS UP TO THE
LIFT HEIGHT SPECIFIED IN THE STRUCTURE TABLE AND SECURING WITH WOODEN STAKES TO
PROVIDE A RIGID BACKSTOP FOR COMPACTING SOIL LIFT.
16. PLACE SOIL BACKFILL UP TO THE LIFT HEIGHT SPECIFIED OF NO GREATER THAN 1.0 FT BEING
CAREFUL NOT TO PUSH/PULL OR TEAR THE FABRIC PREVIOUSLY PLACED.
17. THE TOP OF THE SOIL BACKFILL SHALL BE FLAT WITHIN THE LIFT SETBACK DISTANCE SPECIFIED
IN THE STRUCTURE TABLE. BEYOND THE LIFT SETBACK DISTANCE, THE SOIL BACKFILL SHALL BE
SLOPED AT AN APPROXIMATE 5% SLOPE AWAY FROM THE STREAM.
18. TOP DRESS THE SOIL LIFT WITH TOPSOIL FROM THE FACE OF THE SOIL LIFT BACK INTO THE
FLOODPLAIN AT LEAST 4FT.
19. REMOVE THE SAWN LUMBER AND WOODEN STAKES FROM THE FACE OF THE SOIL LIFT AND
WRAP THE FACE AND TOP OF THE SOIL LIFT USING THE WOVEN AND NON -WOVEN COIR MATTING
HANGING OVER THE PREVIOUS LIFT/COIR FIBER LOGS.
20. THE EROSION CONTROL FABRIC SHALL BE PULLED AS TIGHT AS POSSIBLE WITHOUT TEARING OR
EXCESSIVELY DISTORTING THE FABRIC.
21. SECURE THE EROSION CONTROL AND NON -WOVEN MATTING IN PLACE BY STAKING THE END OF
THE EROSION CONTROL FABRIC WITH WOODEN STAKES ON 1.5 -FOOT CENTERS.
22. BEGIN CONSTRUCTION OF THE NEXT SOIL LIFT BY REPEATING THE PREVIOUS NOTES STARTING
WITH NOTE 11.
23. THE OVERALL SLOPE CREATED BY THE LIVE BRUSH LAYERING SHALL MATCH THE PROPOSED
CROSS SECTION SHAPE FOR THE OUTER BANK OF THE THE TYPICAL POOL CROSS-SECTION FOR
EACH REACH.
24. THE COIR BLANKETS AND GEOTEXTILE FABRIC USED FOR THE UPPER MOST SOIL LIFT WILL BE
SECURED WITHIN A 6 INCH DEEP TRENCH AS SHOWN IN DETAIL. TRENCH AS SHOWN IN THE
DETAIL.
25. THE SURFACE OF THIS STRUCTURE SHALL BE FINISHED TO A SMOOTH AND COMPACT SURFACE
IN ACCORDANCE WITH THE LINES, GRADES, AND CROSS-SECTIONS OR ELEVATIONS SHOWN ON
THE DRAWINGS. THE DEGREE OF FINISH FOR ELEVATIONS SHALL BE WITHIN 0.1 FT OF THE
GRADES AND ELEVATIONS INDICATED OR APPROVED BY THE ENGINEER.
26. RE -DRESSING OF CHANNEL AND BANKFULL BENCH/FLOODPLAIN WILL LIKELY BE REQUIRED
FOLLOWING INSTALLATION OF IN -STREAM STRUCTURES AND SHALL BE CONSIDERED INCIDENTAL TO
CONSTRUCTION.
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DETAILED STAKING PLAN
EROSION CONTROL MATTING
NOTES
1. EROSION CONTROL MATTING IS USED TO PROTECT RECENTLY
ACONSTRUCTED STREAM BANKS FROM EROSION. THE MATTING WILL
NOT TO SCALE
SUPPLEMENT WOODEN STAKES
WITH 12" ECO -STAKES
700 GRAM COIR FIBER MATTING
2' LONG 2" x 2" WOOD STAKES
w/ 3" GALVANIZED ROOFING NAIL
AT THE TOP TO SECURE MATTING
REMAIN INTACT WHILE THE BANK AND RIPARIAN VEGETATION MATURES,
PROVIDING CRITICAL BANK PROTECTION.
2. BEFORE INSTALLING COIR FIBER BLANKET, RAKE SOIL LEVEL AND ADD
SEED, FERTILIZER, LIME AND MULCH.
3. 700 GRAM COIR FIBER EROSION CONTROL MATTING SHALL BE PLACED
ALONG THE LENGTH OF THE NEW CHANNEL FROM THE TOE OF SLOPE
OUT TO A MINIMUM OF 3 FT BEYOND THE BANKFULL ELEVATION.
4. SECURE COIR MATTING IN PLACE BY STAKING AND OVERLAPPING AT
THE SEEMS WITH A SHINGLE -TYPE METHOD SUCH THAT THE
OVERLAPPING PIECE IS IN THE SAME DIRECTION AND AS THE STREAM
FLOW. ADDITIONAL STAKING SHALL BE APPLIED BY THE CONTRACTOR
AT NO ADDITIONAL COST IF THE MATTING SEPARATES FROM THE SOIL
MORE THAN ONE INCH UNDER A REASONABLE PULL.
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