NCARNG_Wilmington_RC_Addendum_1_Drawings_20170817_Part_2.pdf

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BID FINAL SUBMITTAL

Designed:

Drawn :

Checked:

Drawing No.:

Date:

Drawing Title:

Scales:

Key Plan:

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03 APRIL 2017

DATEREV DESCRIPTION

501 North Broadway, Saint Louis, Missouri 63102

DISCLAIMER

ATTACHMENT OF THIS SEAL TO THIS DOCUMENT IS MADE ONLY

FOR THE PURPOSE OF AUTHENTICATING THIS DOCUMENT.

RESPONSIBILITY FOR ALL OTHER DOCUMENTS RELATING TO

THIS PROJECT IS DISCLAIMED

REGISTRATION NUMBER:

NC Engineering Firm License No. F-0287

NC Architectural Firm No. 50757

CS711

STORM DRAINAGE

DETAILS

JEG

JEG

TJW

TOP ELEVATION OF STORMWATER

FRONT VIEW

1.0

VARIES

0.75' MIN

EXISTING SLOPES

#5 WASHED STONE

KEYED RIP RAP

STONE

SIDE VIEW

CLASS B RIP-RAP

#5 WASHED

1.0'

0.5'-1'

2 MAX.

STEP SEQUENCE

EXISTING GROUND

1.5'

MAINTENANCE:

INSPECT CHECK DAMS AND CHANNELS DAILY AND REPAIR, AS NECESSARY FOLLOWING EVERY

RAINFALL EVENT OF GREATER THAN 1/2" WITHIN A 24HR PERIOD. CLEAN OUT SEDIMENT, STRAW, LIMBS, OR OTHER DEBRIS THAT COULD CLOG THE CHANNEL WHEN NEEDED.

ANTICIPATE SUBMERGENCE AND DEPOSITION ABOVE THE CHECK DAM AND EROSION FROM HIGH

FLOWS AROUND THE EDGES OF THE DAM. CORRECT ALL DAMAGE IMMEDIATELY. IF SIGNIFICANT EROSION OCCURS BETWEEN DAMS, ADDITIONAL MEASURES CAN BE TAKEN SUCH AS, INSTALLING A PROTECTIVE RIPRAP LINER IN THAT PORTION OF THE CHANNEL (PRACTICE 6.31, RIPRAP-LINE AND

PAVED CHANNELS).

REMOVE SEDIMENT ACCUMULATED BEHIND THE DAMS AS NEEDED TO PREVENT DAMAGE TO

CHANNEL VEGETATION, ALLOW THE CHANNEL TO DRAIN THROUGH THE STONE CHECK DAM, AND

PREVENT LARGE FLOWS FROM CARRYING SEDIMENT OVER THE DAM. ADD STONES TO DAMS AS

NEEDED TO MAINTAIN DESIGN HEIGHT AND CROSS SECTION.

NOTE: REMOVE SEDIMENT ACCUMULATION

FROM BEHIND CHECK DAMS TO PREVENT

DAMAGE TO CHANNEL VEGETATION. FLOW

SHOULD BE MAINTAINED THROUGH THE DAM.

CONSTRUCTION SPECIFICATIONS

1. PLACE STONE TO THE LINES AND DIMENSIONS SHOWN IN THE PLAN ON A FILTER FABRIC FOUNDATION.

2. KEEP THE CENTER STONE SECTION AT LEAST 9 INCHES BELOW NATURAL GROUND LEVEL WHERE THE

DAM ABUTS THE CHANNEL BANKS.

3. EXTEND STONE AT LEAST 1.5 FEET BEYOND THE DITCH BANK TO KEEP WATER FROM CUTTING AROUND

THE ENDS OF THE CHECK DAM.

4. SET SPACING BETWEEN DAMS TO ASSURE THAT THE ELEVATION AT THE TOP OF THE LOWER DAM IS THE

SAME AS THE TOE ELEVATION OF THE UPPER DAM.

5. PROTECT THE CHANNEL AFTER THE LOWEST CHECK DAM FROM HEAVY FLOW THAT COULD CAUSE

EROSION.

6. MAKE SURE THAT THE CHANNEL REACH ABOVE THE MOST UPSTREAM DAM IS STABLE.

7. ENSURE THAT OTHER AREAS OF THE CHANNEL, SUCH AS CULVERT ENTRANCES BELOW THE CHECK

DAMS, ARE NOT SUBJECT TO DAMAGE OR BLOCKAGE FROM DISPLACED STONES.

FILTER FABRIC

FILTER FABRIC

1.0'

NCDEQ COMMENTS1 07/18/17

PERMIT SUBMITTAL

2' MIN.

PLAN VIEW

CROSS SECTION

POSITIVE GRADE 5.0% MAX.

-STABILIZE DIVERSION DITCH WITH TEMPORARY

SEEDING AND EROSION CONTROL NETTING (DOUBLE

STRAW MATT > 0.85 #/SF SHEAR STRENGTH).

STEEP CUT OR

FILL SLOPE

2:1 SLOPE (MAX)

COMPACTED

2' MIN.

18"

UPSLOPE TOE

SIDE SLOPES

2:1 (MAX)

STEEP CUT OR FILL SLOPE

2' MIN.

CONSTRUCTION SPECIFICATIONS

1. REMOVE AND PROPERLY DISPOSE OF ALL TREES, BRUSH, STUMPS, AND OTHER OBJECTIONABLE MATERIAL.

2. ENSURE THAT THE MINIMUM CONSTRUCTED CROSS SECTION MEETS ALL DESIGN REQUIREMENTS.

3. ENSURE THAT THE TOP OF THE DIKE IS NOT LOWER AT ANY POINT THAN THE DESIGN ELEVATION PLUS THE SPECIFIED SETTLEMENT.

4. PROVIDE SUFFICIENT ROOM AROUND DIVERSIONS TO PERMIT MACHINE RE-GRADING AND CLEANOUT.

5. VEGETATE THE RIDGE AND CHANNEL IMMEDIATELY AFTER CONSTRUCTION, UNLESS IT WILL REMAIN IN PLACE LESS THAN 30

WORKING DAYS.

GENERAL NOTES:

1. DIVERSION TO BE USED TO CONVEY SEDIMENT LADEN WATER INTO AN APPROVED EROSION AND SEDIMENT CONTROL BMP.

2. IMMEDIATELY LINE AND STABILIZE BEFORE ANY DOWNSLOPE GRADING BEGINS (STABILIZATION MUST OCCUR BEFORE ISSUANCE OF

A CERTIFICATE OF COMPLIANCE). STABILIZATION METHOD IS BASED ON VELOCITY OF DRAINAGE.

3. DIVERSIONS SHOULD ONLY BE USED FOR DRAINAGE AREAS 5 ACRES OR LESS.

4. MINIMUM LONGITUDINAL SLOPE OF DIVERSION SHALL BE 0.3%.

5. DEPTHS SHOWN SHALL BE FINAL AFTER SETTLEMENT. CONTRACTOR SHALL BE RESPONSIBLE FOR ADJUSTING DITCHES IN FIELD TO

MEET DESIGN CRITERIA IF SETTLEMENT OCCURS.

6. REFER TO SKIMMER BASIN DETAIL FOR DIVERSION DITCH/SKIMMER BASIN ENTRANCE.

MAINTENANCE:

INSPECT TEMPORARY DIVERSIONS DAILY AND REPAIR, AS NECESSARY AND FOLLOWING EVERY RAINFALL EVENT OF GREATER THAN 1/2" WITHIN A 24HR PERIOD. IMMEDIATELY REMOVE SEDIMENT FROM THE FLOW AREA AND REPAIR THE DIVERSION RIDGE. CAREFULLY CHECK OUTLETS AND MAKE TIMELY REPAIRS AS NEEDED. WHEN THE AREA PROTECTED IS PERMANENTLY STABILIZED, REMOVE THE RIDGE AND THE CHANNEL TO BLEND WITH THE NATURAL GROUND LEVEL AND APPROPRIATELY STABILIZE IT.

CS600

DIVERSION DITCH WITH ROCK CHECK DAMS DETAIL

NOT TO SCALE

PERMIT SUBMITTAL