APPENDIX 3 Typical Road Maintenance Drawings.pdf

CLEARING LIMITS

METHOD A

FILL SLOPE

CLEARING

HEIGHT 14 feet

ROADBED

SHOULDERS

DITCH LINE

CUT SLOPE

10'

5'

CLEARING LIMITS

METHOD B

FILL SLOPE

CLEARING

HEIGHT 14 feet

ROADBED

SHOULDERS

DITCH LINE

CUT SLOPE

5' above road. Scatter to fill slopes below road, no debris piles allowed at culvert outlets.

4. Cut brush to provide overhead clearance of 14 feet on

Cut all brush within treatment area which is less than or

6.

equal to 6 inches in diameter measured 6 inches above

Cut brush to provide sufficient site distance on the inside of sharp curves to eliminate blind corners and intersections.

7.

General Notes:

1.

For Method A, cut brush back 5' slope distance beyond

Clear ditches of woody debris. Clean culvert inlets and outlets of debris a minimum of 2 culvert diameters.

2.

5. Remove debris from road surface, ditches, and cut slope bottom of ditch or 15' slope distance from road shoulder, whichever is less, and10' slope distance

For Method B, cut all brush within 5' of culvert inlets. 3.

the ground.

beyond the edge of road shoulder on fill slope.

road surface.

METHOD A TREATMENT AREA: FROM 5' SLOPE DISTANCE BEYOND TOE OF DITCH TO 10' SLOPE

DISTANCE ON FILL SLOPE

METHOD B TREATMENT AREA: FROM TOE TO DITCH TO 5' SLOPE DISTANCE ON FILL SLOPE

DRAWING TITLE

PROJECT NAME

DRAWN

DESIGNER

CHECKED

ARCHIVE NO.

DATE

PROJECT NO.

DWG SHEET NO.

OFSHEET

United States Department of Agriculture Forest Service

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ALASKA REGION

PROJECT NAME

TONGASS NATIONAL

FOREST

DISTRICT NAME

ROADSIDE BRUSHING

11/9/2018

FS090523_R102013_L1-002.dwg

R. SCHMOHL

K. CHERRY

R. BERRY

X-01

100002

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TYPICAL CULVERT INSTALLATION AT LIVE STREAMS

SELECT BACKFILL MATERIAL AND DEPTH FOR

BEDDING REFER TO FP-14 SECTIONS 602 AND 209.09

PIPE Ø

SUBGRADE

GRADE OF CMP SHALL BE SAME AS EXISTING

STREAM CHANNEL UNLESS OTHERWISE SHOWN

ON DRAWINGS

EXISTING

STREAMBED

1' MIN

4" MIN

1.25

RIP RAP

SEE NOTE 7

TYPICAL CULVERT INSTALLATION FOR DITCH RELIEF

SELECT BACKFILL MATERIAL AND DEPTH FOR

BEDDING REFER TO FP-14 SECTIONS 602 AND 209.09

PIPE Ø

SUBGRADE

GRADE OF CMP SHALL BE SAME AS EXISTING

STREAM CHANNEL UNLESS OTHERWISE SHOWN

ON DRAWINGS

1' MIN

1.25

EXISTING GROUND

VARIABLE SLOPE

2' MIN DEPTH

MINIMUM WIDTH OF

APRON IS 2 PIPE Ø

NOTES

1. PLACE CULVERT IN ALIGNMENT WITH THE NATURAL STREAM

CHANNEL. WHERE NO CHANNEL IS APPARENT, INSTALL CULVERTS

AT SKEWS SHOWN ON THE DRAWINGS OR AS DIRECTED BY THE CO.

2. MINIMUM CULVERT GRADES SHALL BE 5% OR

OF THE TRIBUTARY

DITCH GRADE.

3. CAMBER WILL DEPEND ON SITE CONDITIONS. MAXIMUM CAMBER IS

2% (STEEL OR ALUMINUM CULVERTS) OR 1% (POLYETHYLENE

CULVERTS) OF CULVERT LENGTH BY NO MORE THAN 2.5" AT

CENTER.

4. CATCH BASIN CONSTRUCTION IS REQUIRED WHEN SHOWN ON THE

DRAWINGS AND AT ALL INSTALLATIONS WHERE THE INLET IS LOWER

THAN NATURAL GROUND.

5. CULVERT INLETS AND OUTLETS SHALL EXTEND 24" BEYOND THE

TOE OF THE FILL UNLESS AGREED TO BY THE CO.

6. MINIMUM COVER OVER CULVERTS UNLESS OTHERWISE SHOWN ON

THE DRAWINGS IS 12".

7. PLACE RIPRAP AT SITES SHOWN ON THE DRAWINGS OR AS

DIRECTED BY THE CO. MINIMUM WIDTH OF RIPRAP IS 1.5 PIPE Ø.

MINIMUM RIPRAP SIZE IS CLASS 4.

8. THE CONTRACTOR SHALL PROVIDE THE CO A LIST OF AS-SLOPE

STAKED CULVERT LENGTHS AND LOCATIONS.

CULVERT SKEW DIAGRAM

BEGIN PROJECT ℄ END PROJECT

TYPICAL CATCH BASIN WITH DITCH BLOCK

CONSTRUCT DITCH BLOCK OF ROCK

WITH 12" MAX AVERAGE DIAMETER.

HEIGHT OF DITCH BLOCK SHALL BE NO

GREATER THAN THE TOP OF THE CULVERT

25' TAPER EACH SIDE

ALUMINUM & STEEL CULVERT CORRUGATIONS

SHALL CONFORM TO THE FOLLOWING:

PIPE SIZE MINIMUM (IN./GAGE) CORRUGATIONS

(IN) STEEL ALUMINUM

18 TO 36 0.064"/16 0.060" / 16 2

" X 0.5"

48 0.079" / 14 0.075" / 14 2

" X 0.5"

60 0.079" / 14 0.075" / 14 5" X 1"

72 0.109" / 12 0.105" / 12 5" X 1"

POLYETHYLENE (PE) CULVERT

PER ASTM D 3350

CORRUGATED

PIPE SIZE MIN COVER CELL CLASS CELL CLASS

Ø NO. 315412C NO. 324420C

MAX FILL HEIGHT IN FEET

18" 12" 12' 10'

24" 12" 12' 10'

30" 12" 12' 10'

36" 12" 11' 10'

POLYETHYLENE (PE) CULVERT

PER ASTM D 3350

RIBBED

PIPE SIZE MIN COVER CELL CLASS CELL CLASS

Ø NO. 334433C NO. 335434C

MAX FILL HEIGHT IN FEET

18" 12" 18' 24'

24" 12" 22' 28'

30" 12" 22' 28'

36" 12" 25' 31'

40" 12" 21' 27'

48" 12" 21' 26'

DIRECTION

OF FLOW

DRAWING TITLE

DRAWN

DESIGNER

CHECKED

ARCHIVE NO.

DATE

PROJECT NO.

DWG SHEET NO.

OFSHEET

United States Department of Agriculture Forest Service

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PROJECT NAME

TONGASS NATIONAL

FOREST

DISTRICT NAME

TYPICAL CULVERT

DETAILS

XX/XX/XXXX

FS090523_R102013_L1-002.dwg

TNF

K. CHERRY

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