19980166 Ver 1_Complete File_19980219

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
1?•
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
March 9, 1998
Macon County
DWQ Project 980166
APPROVAL of 401 Water Quality Certification and ADDITIONAL CONDITIONS
Mr. W. Trent Anderson
PO Box 1551
Andrews NC 28901
Dear Mr. W. Trent Anderson:
You have our approval, in accordance with the attached conditions and those listed below, to impact 40
linear feet of waters for the purpose of road crossing at Highlands, as you described in your application dated
February 19, 1998. After reviewing your application, we have decided that this impact is covered by
General Water Quality Certification Number 3103. This certification allows you to use Nationwide Permit
Number NW 14 when it is issued by the Corps of Engineers. In addition, you should get any other federal,
state or local permits before you go ahead with your project including (but not limited to) Sediment and
Erosion Control, Coastal Stormwater, Non-Discharge and Water Supply Watershed regulations. This
approval will expire when the accompanying 404 or CAMA permit expires unless otherwise specified in the
General Certification.
This approval is only valid for the purpose and design that you described in your application except as
modified below. If you change your project, you must notify us and you may be required to send us a new
application for a new certification. If the property is sold, the new owner must be given a copy of this
Certification and approval letter and is thereby responsible for complying with all conditions. If total
wetland fills for this project (now or in the future) exceed one acre, compensatory mitigation may be required
as described in 15A NCAC 2H .0506 (h) (6) and (7). For this approval to be valid, you must follow the
conditions listed in the attached certification and any additional conditions listed below.
Sediment and erosion control measures shall adhere to the design standards for sensitive watershed
(T 15A:04B .0024).
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing.
You must act within 60 days of the date that you receive this letter. To ask for a hearing, send a written
petition conforming to Chapter 150B of the North Carolina General Statutes to the Office of Administrative
Hearings, P.O. Box 27447, Raleigh, N.C. 27611-7447. This certification and its conditions are final and
binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water
Act. If you have any questions, please telephone John Domey at 919-733-1786.
in AnHoward, Da .E.
Attachment
cc: Wilmington District Corps of Engineers
Corps of Engineers Asheville Field Office
Asheville DWQ Regional Office
Mr. John Domey
Central Files
980166.1tr
Division of Water Quality • Non-Discharge Branch
4401 Reedy Creek Rd., Raleigh, NC 27607 Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer • 50% recycled/10% post consumer paper

9 8
STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
JAMES B. HUNT JR.
GOVLRNOR
February 9, 1998
MACON COUNTY
SR 1680
Mr. Bob Johnson
US Army Corps of Engineers
Reg. Field Office
151 Patton Avenue
Room 143
Asheville, N. C. 28801-5006
Dear Mr. Johnson:
Division of Highways
11.0. Box 1551, Andrews, NC 28901
9,
E.NORRIS TOLSON
SIi TFI'ARY
The North Carolina Department of Transportation is proposing to widen and pave
SR 1680 - McCall Road, in Macon County. In order to construct this project in
accordance with our current secondary road standards it will be necessary to install a
pipe culvert which carries streamflow of an unnamed tributary to Turtle Pond Creek
(DEM Class C -Trout Water). We are requesting authorization to proceed under Section
404 of the Clean Water Act.
1 am sending a location map, straight-line diagram, plan-profile sheets, erosion
control plans and details, and a U.S.G.S. map indicating project area and location of the
proposed pipe culvert on the road. Tlie pipe culvert is to be installed slightly below the
existing streambed elevation if bedrock is not encountered to minimize impacts to
wildlife habitat and allow the existing stream gradient to remain as unchanged as is
physically possible.
The best management practices will be used to minimize and control erosion and
sedimentation on this project. The construction foreman will review all erosion control
measures daily to ensure erosion and sedimentation are being effectively controlled. If

Mr. Bob Johnson
Page 2
February 9, 1998
the planned devices are not functioning as intended, they will immediately be replaced
with better devices. The rock silt screens and other erosion control devices will be in
place prior to pipe culvert construction and will remain in place until the project is
stabilized.
By copy of this letter I am asking Mr. Mark Davis, North Carolina Wildlife
Resources Commission (NCWRC) Western Mountain Region Coordinator, to comment
directly to you concerning this 404 Nationwide Permit request.
Also, by copy of this letter, I am requesting authorization to proceed under
Section 401 of the Clean Water Act from the Division of Environmental Management
(DEM).
We would like to begin construction as soon as possible. If further information is
required, please call me at [phone]. Your early review and consideration will be
greatly appreciated.
Sincerely,
.I
W. T. Anderson
County Maintenance Engineer
WTA/rr
Attachments
cc: Mr. F. D. Martin, P. E., Division 14 Engineer
Mr. E. L. Ingle, Area Roadside Environmental Engineer
Mr. Eric Galamb, Water Quality Certification Unit, DEM
Mr. Mark Davis, Western Mountain Region Coordinator, NCWRC

DEM ID: CORPS ACTION ID:
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT N)
4-
PRE-CONSTRUCTION NOTIFICATION APPLICATION
FOR NATIONWIDE PERMITS THAT REQUIRE:
1) NOTIFICATION TO THE CORPS OF ENGINEERS
2) APPLICATION FOR SECTION 401 CERTIFICATION
3) COORDINATION WITH THE NC DIVISION OF COASTAL MANAGEMENT
SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE
FIELD OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN
(7) COPIES SHOULD BE SENT TO THE N.C. DIVISION OF ENVIRONMENTAL MANAGEMENT
(SEE AGENCY ADDRESSES SHEET). PLEASE PRINT.
1. OWNERS NAME: No(-L/1 (20Coliaa_ Depaftityxe-nl ok _ (oyiSp0
2. MAILING ADDRESS: P, o. x I SS ) AYId (e?(S t? C, 2!B
SUBDIVISION NAME:
CITY: STATE: ZIP CODE:
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE):
SR ICn80 W Call Road. , N ig??ar,?s Qc'
3. TELEPHONE NUMBER (HOME): (WORK): C-704) S2-1- 4105
4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER:
\J. wren{, AviAe-c5or...' , 1)
n,vJ,p 1a11Ce, Enq l wlee
5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC
MAP OR AERIAL PHOTOGRAPHY WITH SCALE): COUNTY: Macom NEAREST TOWN OR CITY:
? qY, 41?dS
SR Iu80 CW(2011 Ro
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SPECIFIC LOCATION (INCLUDE ROAD
NUMBERS, LANDMARKS, ETC.):
6. IMPACTED OR NEAREST STREAM/RIVER: U V\ noftlCA 1 ??u?Ory u--?urile PondCreek-
RIVER BASIN: Li We. I-e-n?ncsSec Rive(-
7a. IS PROJECT LOCATED NEAR WATER CLASSIFIED AS TROUT, TIDAL SALTWATER
(SA), HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE WATERS (ORW), WATER
SUPPLY (WS-I OR WS-II)? YES P< NO [ ] IF YES, EXPLAIN:
D Em Classi}ic.a{,?or` ok Turtle VPor\A Creek -- Blass C -Troup akec-
7b. IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL
MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES [ ] NO [>4
7c. IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY (SEE PAGE 7 FOR
LIST OF COASTAL COUNTIES), WHAT IS THE LAND USE PLAN (LUP1 DESIGNATION?
8a. HAVE ANY SECTION 409 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON
THIS PROPERTY? YES [ ] NO Xj IF YES, PROVIDE ACTION I.D. NUMBER OF
PREVIOUS PERMIT AND ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 901
CERTIFICATION):
8b. ARE ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS PROPERTY IN THE
FUTURE? YES [ ] NO VU IF YES, DESCRIBE ANTICIPATED WORK:
9a. ESTIMATED TOTAL NUMBER OF ACRES IN TRACT OF LAND:
0.(oS Acres
9b. ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
0.004 Acce - - S Lreorv-. D Istvr6ac.e- (Culvec- inq
2
l l'-U "
10a. NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY:
FILLING: EXCAVATION:
FLOODING: OTHER:
DRAINAGE: TOTAL ACRES TO BE IMPACTED:
10b. (1) STREAM CHANNEL TO BE IMPACTED BY THE PROPOSED PROJECT (IF
,RELOCATED, PROVIDE DISTANCE BOTH BEFORE,AND AFTER RELOCATION):
LENGTH BEFORE: FT AFTER: FT
WIDTH BEFORE (based on normal high water contours): FT
.. 11
WIDTH AFTER:
AVERAGE DEPTH BEFORE: FT AFTER: FT
(2) STREAM CHANNET IMPACTS WILL RESULT FROM: (CHECK ALL THAT APPLY)
OPEN CHANNEL RELOCATION: PLACEMENT OF PIPE IN CHANNEL:
CHANNEL EXCAVATION: CONSTRUCTION OF A DAM/FLOODING:
OTHER:
11. IF CONSTRUCTION OF A POND IS PROPOSED, WH LIS THE SIZE OF THE
WATERSHED DRAINING TO THE POND? WHAT IS THE EXPECTED POND SURFACE AREA? N A
12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OF
MECHANICAL EQUIPMENT TO BE USED (ATTACH PLANS: 8 112" X 11" DRAWINGS
ONLY):
AeA and pave. SR 1(080 4-6 nnee.+, cwren? NCDOT
_Secoh da ru rn to nd o rds , Pipe- and a 56o c Ae& e rps i o r. -
Con?co1 revises will be. 'tnAa«Q \xlix.11, Q hydrou)ic, e-Kcova-6r,
13. PURPOSE OF PROPOSED WORK: Sctryie, a6 4 12 n6ye.
V
3
14. STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED
OUT IN WETLANDS. (INCLUDE ANY MEASURES TAKEN TO MINIMIZE WETLAND
IMPACTS):
TI\r- roaA, cucrertkly crosses _-U\e :5t(wv y; a a
We, no nose tb i ns ?I a D'102 cu6er"L A,bf tv?'e -sir .o w`-
1 Yl
lkj
15. YOU ARE REQUIRED TO CONTACT THE U.S. FISH AND WILDLIFE SERVICE
(USFWS) AND/OR NATIONAL MARINE FISHERIES SERVICE (NMFS) (SEE AGENCY
ADDRESSES SHEET) REGARDING THE PRESENCE OF ANY FEDERALLY LISTED OR
PROPOSED FOR LISTING ENDANGERED OR THREATENED SPECIES OR CRITICAL HABITAT
IN THE PERMIT AREA THAI MY BED FFECTED BY THE PROPOSED PROJECT. DATE
(ATTACH RESPONSES
CONTACTED: ac, 404 (jueSt.
FROM THESE AGENCIES.)
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHPO) (SEE AGENCY ADDRESSES SHEET) REGARDING THE PRESENCE OF HISTORIC
PROPERT S IN THE PROJECTIEDATE CONTAC EfDT AREA CH0??H ?Y `BF,??F F?? Re?Ves?ROPOSED % 17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OR THE USE OF
PUBLIC (STATE) LAND?
YES K NO [] (IF NO, GO TO 18)
a. IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL
DOCUMENT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA ENVIRONMENTAL
POLICY ACT?
YES [ J NO
b. IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA
DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE?
YES [ J NO [ J
IF ANSWER TO 17b IS YES, THEN SUBMIT APPROPRIATE DOCUMENTATION FROM THE
STATE CLEARINGHOUSE TO DIVISION OF ENVIRONMENTAL MANAGEMENT REGARDING
COMPLIANCE WITH THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT.
QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW PROCESS SHOULD BE
DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE CLEARINGHOUSE, NORTH
CAROLINA DEPARTMENT OF ADMINISTRATION, 116 WEST JONES STREET, RALEIGH,
NORTH CAROLINA 27603-8003, TELEPHONE [phone].
4
I.,
18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS APPLICATION IF
PROPOSED ACTIVITY INVOLVES THE DISCHARGE OF EXCAVATED OR FILL MATERIAL
INTO WETLANDS:
a. WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STREAMS, LAKES
AND PONDS ON THE PROPERTY (FOR NATIONWIDE PERMIT NUMBERS 14, 18, 21, 26,
29, AND 38). ALL STREAMS (INTERMITTENT AND PERMANENT) ON THE PROPERTY
MUST BE SHOWN ON THE MAP. MAP SCALES SHOULD BE 1 INCH EQUALS 50 FEET OR 1
INCH EQUALS 100 FEET OR THEIR EQUIVALENT.
b. IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WETLANDS TO BE,
IMPACTED BY PROJECT.
C. IF DELINEATION WAS PERFORMED BY,A CONSULTANT, INCLUDE ALL DATA
SHEETS RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE.
d. ATTACH A COPY OF THE STORMWATER MANAGEMENT PLAN IF REQUIRED.
e. WHAT IS LAND USE OF SURROUNDING PROPERTY?
FZesIAe?n?.ia? ,
f. IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL?
N /A
g. SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF APPLICABLE.
NOTE: WETLANDS OR WATERS OF THE U.S. MAY NOT BE IMPACTED PRIOR TO:
1) ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS PERMIT,
2) EITHER THE ISSUANCE OR WAIVER OF A 401 DIVISION OF
ENVIRONMENTAL MANAGEMENT (WATER QUALITY) CERTIFICATION, AND
3) (IN THE TWENTY COASTAL COUNTIES ONLY), A LETTER FROM THE
NORTH CAROLINA DIVISION OF COASTAL MANAGEMENT STATING THE PROPOSED
ACTIVITY IS CONSISTENT WITH THE NORTH CAROLINA COASTAL MANAGEMENT
PROGRAM.
I ADr? J"A0AAA
OWNER'S/AGENT ' SIGNATURE
(AGENT'S SIGNATURE VALID ONLY
IF AUTHORIZATION-LETTER FROM
THE OWNER IS PROVIDED (18g.))
Fe.bruar q 1998
ATE
5
00.11Y C". \ MAC O N COUNTY ......
/ 1157 ? ?- •? , F ? . - ? - . , .. .\
° .1 a ly1V•-1 1 1 Fr! ,
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I-?1 `7, .e!? _3w \ KNOB
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MAP
!7?4 r T? I + _ '\ I'+{ KNOB
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l ?/ / J 1 1 /V / 1 lye ••s''?(\Y! ??1? , /' KNOB
I/Iy IIVAI. '. ? L ?(Iyy WaF
r } ONION 1 !44! tqn j KNOB
MIN. I O
' OLD RZICKY
WIN.
l
0 1 op
l A 1 1.\ fla 10-01 a _ 22? z . I
I frnWu
Nw x !M`
\ IS MTN•
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\ HOGBACK MI N• BLKK CREEK GAP
21 / ELEV. 4.950
/.. .\ ? 111 ?? \
/ ?.? • 1 !k71 BLACK ROCK MIN.
r'
0 0? / ?.? Ipt3 \ YELLOW MIN. (\
1` \ .?'... ILA I •n a-w. .' + t N \ ELEV. 5.145 O
LWA-
T \
1 IY.I.Ir I r \ Elie 1 / C,r !?pY ? W ? '-. ' I
EMIPL 164 \ M
CV1 AS
00
FISIMARA
I N. SKY HI
1 1 14!9 v `?? IlM
1-j; 1171 ? liw? .233
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-..?g. 1144 COPE
111 d./ ' .'EN D [` v.M.oOK EA11P 1 "Am;•
wxoay ?O / I KNOLL 11 ' v' CQN5/A1RU, /1\ 7 •10 . A , . 0 Kf 9/'90'
111 a ./ •?'• 0+00
1 1 v
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pit)
?'?:•._?.&EGI I.I FALLS ! 1 HIGHLANDS
1 -----
1113 OM ) 7 141, . l? tJ ry./S/K-T K XT ` 10 ? rte` r DOG MIN. \ / LJ/-r -•' / l7 MACON CO. Fw
? 1? 1•) , ' ?• J.K T 0? 1.9 \\•`• MCKFOII CO. 4
/ . 'O 111 V 1 Gy / \ 1. ? / -
-6 SCALY MTtV
lil I ^ 1079 '? --V / MY. 4,804 . I 1 \
n , BUCK yn 4) r e3I S C . r \,' I \
.Illor 1134 °\ I KNOB SAS ?1?•? I\-? r'• r----'-!?.?, \ '
!? / / ds. / \ 1 III. I, SATLILAH MTN• /
'i? 1 ELEV. 4,660
1106 y / i
64
4.4 1 10 LITTLE f
M/Ohrrv O t•'t ? SCALY MIN. / r \ 1 - \' `1 i•
?.' Inel t ELEV. 4,100 5.
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N.-A r. \ •J-„ 1? •14'?. ' ?Qti \ • \ .e v p .1 .? ?\ J ./, '\
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y / Irl .,t Iron
os r '?.J \ - Ie /
n I? 1 Y.1 ?V+•a ? r py OSAGE
WIN.
.-..-v.l?.-..5-1 ' ?~.-.. -..n .. ..... 176 ? 19.7'!. . .-.. .! .-r-..-..-..- ..?..- .r?••. ...-. ?..-.. -..? d toe, •1 -COMM_ISSIO_NERS_ ROC-
.
. K ` \ o / b ELLIOIS
< b ° RABUN COUNTY
COUNTY,
/u
F n u (', .I I A II
114
rRON FALS
C10 U1V3?Y.• MACON
ROAD NAME: McCAIJ. ROAD ROAD NO. SR 1680
WORK ORDER NO. 6.972122
FROM., STA 0+00 IIEG OF PROJECT C/L SR 1678 --
TO: STA. 8+00 END OF PROJECT
ADDITION: YES NO X
IMPROVEMENT: YES X NO
TO BE PAVED: YES x No
POWER POLES TO MOVE, YES X ?NO
TELEPHONE POLES 7.O 1110 VC: YES NO X
MIGHT OF WAY. 60
RIGHT OF WAY: L x 46'
SCALE:
DATE.
1 50'
JUNE 11, 1997
CJ L i
' 1:1 slope /•
' I or flatter
1112: 1 slope I I -?•/•
or flatter 9'
• 6 ettt.u. 3'
?, i 1 811LU. I ! ( mica 1
Slit.?SS-1
43ifOO
4,50
CHECK DAMS SPACED '
AS REQUIRED -
i- 5-00
I
416,
I
1 4,50
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S 1845.1
V < -----
I CIIECK U S-SPACEU AS JREQUIRED I ?-50
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SILT BASIN v SILT BASIN
TYPE- B 8x3x2 I c ' I TYPE -B 8x3x2
Proposed 58l
3c?
LROCK SILT SCREEN C. M. PI e. ArcK
ELSIE Mc CALL
111 McCALL ROAD
IIICIILANUS, NC 28741
(1)
I TEMP. SILT FENCE I
AS NEEDED
I SILT BASIN TYPE- B 8x3x2
416'
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2000 A 2-00
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f-00 1.00
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0-50 1 0450
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416'
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40 0 00 I 0*00
CHECK DAMS SPACED
AS REQUIRED

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Rock Si 1.1
Screer\.
5 ? 1 t Bosin,
8'YiC3' Xg2'
10
3? B R?NcN
SURVEY S?ATIot4 2 +90 ±

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PROP. 5B" X, 30 C,H.P.Al S i It BasinT ?e B
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INSTALL 401-, F. `r 58'
C.M. Pipe ARCH
Scale S R 1(080
M9 Ca I I RoaA
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6460 I- 6450
AS NEEDED

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SILT BASIN I
TYPE-B 8x3x2
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DESCRIPTION SYMBOL
? 1, t? 4 1 1
OR - + -4-
EXISTING FENCE: _
---------------------------------
PROPOSED ROAD:
- - - - - - - - - - - - - -
EXISTING ROAD: - - - - - . - -
RAILROAD: ?- ___ ___________ ___ -----------
CONTROL OF ACCESS LINE--------- - - - C -
-? ft 10
SLOPE STAKE LINE: • - - -
BRIDGE:
----------------L ---------.---I-
CONCRETE CULVERT:
.........
------
PIPE CULVERT .............
? - - . ----------
WOODS: --------------- 9.. D_.IR._.._.. %_.._.
TELEPHONE OR TELEGRAPH POLE: EXISTING: --o- PROPOSED:-O-
. _ _ ... _ _
TOWER POLE LINE: --0-- _ _ __ ¦ _- - •-......
-''
POWER POLE: -? EXISTING: - PROPOSED 6 EASEMENT LINE: BMW _ _ - _ _ --I I /oo - ?, _) -
GUARD RAIL: ___ _ .........................
SANITARY SEWER LINE: -? -_ _ t_ S.S. S.S. -_ ............
1WATER LINE: -
----
LINE: --------------- ----------------------------------------------
GAS
BRUSH BARRIER -?
--- _ --------------
EXISTING CHANNEL :
-- ------------ _. ------ .... .--
PROPOSED CHANNEL CHANGE:
FIBER GLASS ROVING: -? F G R
--------------------------------
I ECDS-SU. EROSION CONTROL
DETAILS & SPECIFICATIONS
STD. NO. I DESCRIPTION: I SYMBOL: IPG. NO.
246.03 TEMP. SILT DITCH TSD VI-2
246.06 TEMPORARY
DIVERSION -, TD
- - - - - - - - - - - -
893
SILT FENCE
01 ITEMP - - - - - - - - - - - - -
VI-6
.
.
----------------------------
890.06 TEMP. SLOPE DRAIN
WITH EARTH BERM
- - - - - - - - - - - - - - - - - - - - -
246.02 SILT BASIN V1-12
TYPE-B
896.10 TEMP. ROCK SILT CHECK VI-16
TYPE-B
892.02 TEMPORARY V7-20
ROCK SEDIMENT DAM
TYPE-B
- - - - - - - - - - - - - - - - - - - - - -
897.01 ROCK PIPE INLET VI-22
PROTECTION AM&
Ff 'm
- - - - - - - - - - - - - - - - - - - - - - -
894.01 724
ROCK SILT SCREEN
TEMPORARY SILT FENCE:
A temporary silt fence is commonly used at the toe of a fill section to prevent off-
site sedimentation. It is made of permeable filter fabric buried at the bottom,
stretched and supported by steel posts. The silt fence reduces the water flow while
retaining the sediment. They may also be used to divert water flow to protected
outlets. Silt fences need to be checked after each significant rainfall to ensure there
effectiveness. They must be maintained on a regular basis. Silt fences shall D-Qt be
installed across streams, ditches, or waterways.
AREAS OF USE:
• At toe of fill sections where sediment runoff can be stored and contained
inside the project limits.
DESIGN CRITERIA:
Material With Wire Without Wire
Fabric Type 3 Class A Type 3 Class B
Steel posts length 5 ft 5 ft.
Post spacing 10 ft. 6 ft. maximum
VI-6 March, 1993
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VI-7 March, 1993

SILT BASIN TYPE-B:

A silt basin type-B is a temporary basin built to collect sediment flowing through a
drainage way. The silt basin is built at the base of the ditch with its length being at
least 2 times the width of the basin. The type-B silt basin is generally built in
conjunction with temporary rock silt checks and other devices that control or slow
down water flow. This device must be monitored closely and cleaned out on a
regular basis until grass is established along the ditch line and sedimentation is no
longer a problem.
AREAS OF USE:
• In conjunction with temporary rock silt checks and other devices used in
drainage ditches.
DESIGN CRITERIA:
• Width - variable
• Length - 2 times width
• Depth - 2 ft. minimum storage - 1800 cubic feet/acre (equals L x W x D)
VI-12 March, 1993
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VI-13 March, 1993
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TEMPORARY ROCK SILT CHECK TYPE-B:

A temporary rock silt check type-B (also called check dam) is a small dam with a
weir used to reduce gullying in drainage ditches that are to be filled or
permanently stabilized at a later date. These type-B rock silt checks help reduce
the flow velocity and are generally made of class-B stone. They are used in ditches
during construction where the grade meets and/or exceeds 3%.
AREAS OF USE:
In channels, roadside ditch outlets, temporary silt ditches, and temporary
diversions.
In conjunction with type-B silt basins.
DESIGN CRITERIA:
Center of rock silt check shall be at least 1
(top of channel sides)
The spacing (ft.) = (3 / % of ditch grade) X
V1- 16
foot lower than the outer edges
100 ft.
March, 1993

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VI-17 March, 1993
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ROCK SILT SCREEN:
7
A rock silt screen is a low-level dam structure to be used in streams below culvert
sites. Rock silt screens shall be used to trap sediment transported by running water
and shall be placed in the stream below the construction site within the right-of-
way or easement boundary. The rock silt screen utilizes class B stone lined with #5
or #57 stone to produce a ripple-effect in the stream to settle the larger sediment
particles transported in the stream from the construction site. The trapped sediment
shall be cleaned out before the device is removed from the stream.
AREAS OF USE:
• In live streams below construction sites where construction occurs in or
adjacent to the stream.
• In live streams below a culvert construction site.
• Where it can be cleaned before it is removed from stream.
DESIGN CRITERIA:
• Structural stone - class B stone
• Sediment control stone - # 5 or # 57 stone
• Dam height - 1.5 ft. minimum and 3 ft. maximum ( shall not be higher than
1 ft. above normal flow of stream)
VI-24 March, 1993
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VI-25 March, 1993