HomeMy WebLinkAbout19961030 Ver 1_Complete File_19961029State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt,Jr., Governor
Jonathan B. Flo wes, Secretary
A. Preston Howard, Jr., P.E., Director
APPROVAL of 401 Water Quality Certification
Mr. Danny Tolar
N.C. Dept. of Transportation
P.O. Box 3279
Asheville, NC 28787
?EHNR
November 8, 1996
Buncombe County
DWQ Project # 961030
Dear Mr. Tolar:
You have our approval to place fill material in 0.03 acres of wetlands or waters for the purpose of
improving SR 1215, as you described in your application dated 23 October 1996. After reviewing your
application, we have decided that this fill is covered by General Water Quality Certification Number 2735.
This certification allows you to use General Permit Number 031 when it is issued by the Corps of
Engineers.
This approval is only valid for the purpose and design that you described in your application. If you
change your project, you must notify us and you may be required to send us a new application. For this
approval to be valid, you must follow the conditions listed in the attached certification. In addition, you
should get any other federal, state or local permits before you go ahead with your project.
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 which conforms 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 Dorney at 919-733-1786.
Sincerely,
P.E.
Howard, Jr. .
Att achment
cc: Wilmington District Corps of Engineers
Corps of Engineers Asheville Field Office
Asheville DWQ Regional Office
Mr. John Domey
Central Files
961030.1tr
Division of Water Quality - Environmental Sciences Branch
Environmental Sciences Branch, 4401 Reedy Creek Rd., Raleigh, NC 27607 Telephone 919-733-1786 FAX # 733-9959
An Equal Opportunity Affirmative Action Employer - 50% recycled/10% post consumer paper
P.O. Box 3279 4
Asheville, N.C. ISSUED
October 23, 1996
Mr. David Baker
U.S. Army Corp of Engineers
Regulatory Field Office
151 Patton Ave. Rm. 143
Asheville, NC. 28801-5006
Subject: S.R. 1215, Buncombe Co.
?o
Oct 29
IM41A -- JAI.-
Dear Mr. Baker:
?'J
We are providing a package of design sketches concerning wetlands that
will be impacted by this project. We have enclosed a completed N. C. D. E. M.
application for your use.
We are planning on replacing or. extending several pipes in unnamed
tributaries crossing S.R. 1215, Milk Sick Cove Road. These are not trout waters
nor tributaries to any.
If you have any comments or questions concerning this project, please
contact J.N. Jarrett or myself of this office at 704-298-274
Thank you for your cooperation and assistance in this matter.
Sincerely yours,
District Engineer
DEM ID: CORPS ?,CTION ID:
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #):
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: N. c. MPC QF T(214f f,5'R?Rnucq
2. MAILING ADDRESS: P.O. 6(A 3Z77
SUBDIVISION NAME:
CITY: 14Sf+EV(LLE STATE:
u.C .
ZIP CODE: 28787
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE):
5R fZf5 M(Lk 5lck COVE
3. TELEPHONE NUMBER (HOME) : (WORK) : 08" Z74-
4.. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER:
D. R. TOLAP, C D(ST: E&IGfQ
P. O. BOY, 3Z77, ASH-EVf LLC, &f c P-680?
5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC
MAP OR AERIAL PHOTOGRAPHY WITH SCALE):
COUNTY : PjU(?IC?(t!t(3? NEAREST TOWN OR CITY: C,414DLEK . uC
t..
1
r4v Ap.,
SPECIFIC LOCATION (INCLUDE ROAD
NUMBERS, LANDMARKS, ETC.):
59 (Z(5 lot(Lk 5(CK CQUC- FROM E.o. P. 1460A sR 12 q (.
K(OR'f(- WEST i4wuG SR [z(5- FOR c -S3 M(LC-5 TO &0--M,
6. IMPACTED OR NEAREST STREAM/RIVER: POLE RIVER BASIN: FREgw MOA D - CREEK
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 [ ] NO [v] IF YES, EXPLAIN:
7b. IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL
MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES [ ] NO [L?,
7c. IF THE PROJECT IS LOCATED WITHIN ,A COASTAL COUNTY (SEE PAGE 7 FOR
LIST OF COASTAL COUNTIES), WHAT'IS'THE,LAND USE PLAN (LUP) DESIGNATION?
u/R
8a. HAVE ANY SECTION 404 PERMITS EEN PREVIOUSLY REQUESTED FOR USE ON
THIS PROPERTY? YES [ ] NO [ IF. YES, PROVIDE ACTION I.D. NUMBER OF
PREVIOUS PERMIT AND ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 401
(lFBTTFTrLTT(')N)
8b.. ARE ADDITIONAL'PERNET REQUESTS EXPECTED.FOR THIS PROPERTY IN THE
FUTURE? YES [ ] 'NO ,[??]. IF YES, DESCRIBE ANTICIPATED WORK:
9a. ESTIMATED TOTAL NUMBER OF ACRES IN TRACT OF LAND:
.9b. ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
O. 15' AC
2
'-.4wv--v
10a. NUMBER OF ACRES OF WETLANDS-IMPACTED BY THE PROPOSED PROJECT BY:
FILLING: Q.Of /Fr- EXCAVATION:
C. 0?- A-C.
FLOODING: OTHER:
DRAINAGE: TOTAL ACRES TO BE IMPACTED: O. 03 AC-
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
WIDTH AFTER:., FT
AVERAGE DEPTH BEFORE: FT AFTER: FT
(2) STREAM CHANNEL IMPACTS WILL RESULT FROM: (CHECK ALL THAT APP LY)
OPEN CHANNEL RELOCATION: PLACEMENT'OF 2IPE IN CHANNEL:
CHANNEL EXCAVATION: CONSTRUCTION'OF`A DAM/FLOODING:
OTHER:
11. IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE SIZE OF THE
WATERSHED DRAINING TO THE POND? NM
WHAT IS THE EXPECTED POND SURFACE AREA? NIA;
12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OP.
MECHANICAL EQUIPMENT TO BE USED (ATTACH PLANS: 8 1/2" X ll".DRAWINGS
ONLY)
5r--VER6L PIES TO BE, REPIUACE6 / EKTEMDED IM UPWIMED
TR(OUTAKtC-S CROSSNCi ROAD.
13. PURPOSE OF PROPOSED- WORK: To &K(L( fATC- THE U(((DEtUlI G PA-U(tJG
OF _5K 2(50 MILL sfck CdVC Rd,
3
c- * -q-,
14. STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED
OUT IN WETLANDS. (INCLUDE ANY MEASURES TAKEN TO MINIMIZE WETLAND
IMPACTS):
SEE Cfz) AiL ROVT W:-? AAD KeCESSAR t MEASURES TO CONTROL
ER05(69 SC-D(MGfMTIQ(1 W(LL BE UT7C.(ZED S(L1' FC-(C CS_ ROCk MT
«8:c5 p( PAS p(7r- f+ES E`fc
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 THAT MAY BE'AFFECTED BY THE PROPOSED PROJECT. DATE 11 CONTACTED: COPY -M .C-W-k.C . lC - Z4JC (ATTACH RESPONSES
FROM THESE:,AGENC ES.)
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHPO) (SEE AGENCY ADDRESSES SHEET) REGARDING THE PRESENCE OF HISTORIC
PROPERTIES IN THE PERMIT AREA WHICH MAY.BE.AFFECTED BY:THE PROPOSED.
PROJECT. DATE CONTACTED: F1IA"
17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OR THE USE OF
PUBLIC .(STATE) LAND?
YES [] NO [?'? (IF NO, GO TO 18)
a. IF YES, DOES THE PRO.JECT.REQUIRE PREPARATION OF AN ENVIRONMENTAL
DOCUMENT PURSUANT'TO THE REQUIREMENTS OF THE NORTH CAROLINA ENVIRONMENTAL
POLICY ACT?
YES [ ] NO [ }
b. IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA
DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE?
YES [ ] NO [ ]
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 (919) 733-61369.4
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?-
ACRtCULTURC RESmEuTA(-
f. IF APPLICABLE, WHAT IS PROPOSED METHOD OF.S.EWAGE DISPOSAL?
l?1?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.
D. R. ToRc,.t
OWNER'S/AGENT'S SIGNATURE DATE
(AGENT'S SIGNATURE VALID ONLY
IF AUTHORIZATION LETTER FROM
THE OWNER IS PROVIDED .(18g.))
5
N.C. DEPARTMENT OF TRANSPORTATION
DIVISON OF-HIGHWAYS
SECONDARY ROAD SURVEY
5 1415 1V (Lk Q Ck CU E
-OCATIO N FNQm sR 1271 NGMWE.S E To E . a . M ,
WOR K YP 6R LE: BAW PME DM(Q
o O DF ?. z1:z-.3T PRIORI lz i
COUNTY- SOWCOMCBF TOWN 5111 P UPPEP\ Hovtfu
DATE I?-z2-96 SCALE "_ so `
NIOTES U/G tCL CABLE- f (D4 Moi.
ST (o +00 To STA 3 a .:
???
PREPARED BY
PI
X215
BUUCOMEBE V_Il_Q K-U RDFR ?. Of-L/23 --
?I/aI
Cat P_ J 6 " fATL- cxp CRASS P?Pt;
(3 ?- 65 40'- 2.4CrAR CRMS P(PE
17+10 ---?G 5„ cm P --
- `{o'- 3o", cm P -_-- --- D2u?Pt PE
C(?SS
WE
- --- - - - E
Zo'- CMP DtZ?c(?P P1 P E
- z +:50 - -- 3 0'.- _ CMg --- - - - MTLF-T coU FRED CCP )
ZZ i-30 ?_ _ Z5 '- (5't MTL
- (sir C? DRu14 PIPE
_ Z3+75 -
------- -
---- 34-3G %Cyp ,-
- -_
-- 3¢' 36 " CAA
P--
-
- _
Cf?oSS PIPE
ZS+25 30'-(z"M-rM 30 ' IS" CkA ----DRc? P(PC
-
Z? -SQ - --`? 36,E Cr P---- --------- OOSS POIE
- -
P
W
-
34- Sdr -- --- - 34-3(3 CSC _
` CROSS P(PE
35 -80 ZO
-(S" CMP
K ,
15R_ ) ? is
- uv? wlvt ? c__ uvvl\jY
DISTANCE FROM
CENTER OF
s-?a?-10 LE PROPOSED PROJECT
q R GHT
(a+99? z1
ZS-f SO
36 t 4.0 I z'
JK UL K= ?? 84VZ3 T-
cP ? L Co 6- ?_fw e7`
?u1ER
?otuER TALE
l7_L?
SER (SOLE
??
?I
:s
:ef
2 5
V I,
1 t?ctcE PIPE
:s
J
- 'Op
rN
bI
t?AJL
' Ito
t 11
I 40 36'' Cr?tP
Z2•S f vilmS
+L
35
Sort p 12 5 T
'R w
y to sI 34'- 3o " couc-
i ,
WOODS
't??P z?'-18'' CAP
a?
pR .
ZO (2" ? ATL ,
?p F ? f
,c x-I
? (8
J
I?
69. DPI
J ?
I
Ig 6 lr
ZZ • 5 ? Z2.5'
lu
• I ? I .
Ci
iSFf? i 4
R vJ I 6 11R DR
R
k ?'- I - "
?
u>RC
- -1 ? CN?P
f S
Zo
I?
I?
7
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
1
1
VI-3 March, 1993
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 not 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
w?
?- z
LLJ
W 3 -,
Q
W
3
2O U Q .
E O
F- O
3 W N
>
N
x 3 °
X am
Q
m
- JJ
cD ° J
O =
? cn
O
Z
QZ
LL.
F-
cn W
?°
a
0 (.D
?-
0
m_
W -
° Co
z
Q J
J
O I
F- S!)
U
If
m
a
LL
cc
W
J
LL
W
3
W
H
O
Z
J
J
U '•
W
Q 0
LL C LLI
U
-
W 3 pQ
F--
JZ O
LL Q U
n n
4111
N n
a 0
a
--III mo
I I ,?
=o
n °
-1 I Z
I_ Uz
W
-111M
C.0
I I-
--------- ---------- ,?_
,
LL 2:
°
o
'v ( ) z
- --.I? w W
Xx
W 3
Q
0 LLJ m
0
c? i cc z
Ld w
W Z z 3 Z N
Q 2
0 2:
m
1 Z
Q¢
U) =
Q LL
D
2: W N Cr
M J° W -J
W 'I
Z W W t!)
= 2 J CO }" m W W
m
J~
Q a° J Z J H
¢ 3
m Q I- W Q LL W
CL -i CC
Nw u=D=(f ) 0 m: - z a
J°cc Cr 0 Lli M H- (!) ? 0
F 0
Q¢ 3
= LQL 3 Q m 0 ° W M¢
° cq
z a
x LLJ
W
Wa:z
W F- J Q-
Q? z0o Z
Q W
E- O
a-Z
`
:
0
~
? o
Q
a: -. z z h- W
UW
- iQO F-
=
W °
OM A o
LLJ
CO
3 F-
C W
< 3 ° W
c? M
>
Z LL 1
LL W Z
?
w1m
I .. O (n O LL °. 2 Q Q-
LL x
0
d
zm
M
W y
W
z
W
LL
_J
}- UO
Q ?x
O 001
CL zz
w o°'
W?
O/'?? dA
cc
Q ?
z
Q
H/?
V )
0
-
C
N
VI-7 . March, 1993
G
TEMPORARY ROCK SILT CHECK TYPE-B: A0.
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 foot lower than the outer edges
(top of channel sides)
• The spacing (ft.) = (3 / % of ditch grade) X 100 ft.
VI-16 March, 1993
U
~
w
O w
O
J ?
Q
O
H U
0 F- U
N H
0 _
0 0
Q LL)
F- Li
> O
LL LL
O O O
W It[
D
z
0
S
U
J
a
S
a
z
3
W
Z -?
Q
.J
LLU
M7
C
W F-
m U
W Q
Z J Cr-
O J F-
F-JQZ
(n0=OZZ
QCCou00
W F- F- H
mz0Lu (n
OZ=CC0
JUQF-WCr=
J CL W
QZ^F-
=0= QwCC=
CO. CCHLL=
W O O CC
ZCc Co LL CLW(n
OWU) ZCo
wF- QOF-OQ
F- Un CC J - - F- J
O ouczwU
Z LL--W::)=
U
H
0
O W
Vc
?i
I -
CD
N m
1Im
w
? ?
' Z
;
F- O I
LL)
F-
O
I v Q
w
Co W
J
I-
Q ! W
.Co
Q-
I
U
I LLJ
U
O J
J
m U)
= (10
W CC) ?: z
r
a F- F- O F ,
r- O
rr-? o e"
(j ~
<I .?'.
\, 0 C
z z F-
H
r 12L F
0 , 0
o =
t-s = LLJ
U U J I---
LLI
(n0 LLI Q
?? -- ('00
0
(n W O
r r (n N
Q
CC >
/1
C
I C
: Q I Z
zj o
a w CI)
?
i
ZI N? Zi
<E
'' U Ol
V)i o
>i E
W!
CI `
^
°" N
j -
m?
n_
I z QI
VI-17. March, 1993
PIPE OUTLET ENERGY DISSIPATOR:
A pipe outlet energy dissipator shall be used at pipe outlets to slow the water
velocities when it exits the pipe and flows out ditched or natural waterways. It is
an apron of stone of a sufficient thickness to protect the outlet area from scouring
out and causing-off-site sedimentation damage. Pipe outlet energy dissipators
should be built according to the guideline chart shown on page VIII-3 of this
manual.
AREAS OF USE:
• Outlets of pipes and culverts to prevent scouring.
DESIGN CRITERIA:
• In accordance with chart on page VIII-3.
• Filter fabric, or six inch layer of gravel, shall be used under stone.
MATERIALS:
• Filter fabric shall meet requirements of section 1056 of Standard
Specifications for Roads and Structures, January 1, 1990, for type II filter
fabric.
VI-34 March, 1993
?c
m c
Q L
?U
LL 'a
as
oC c
?a + a
3 _
04)
+
s o i i
!1 Z '
v
C
b
C
? O
0
(D U
a?
CL
E
F
_ L
0
cz
Q.
(n
V)
0
L
W
O L
U d
..1
w?
u. C7
O
WW
l..i.
C CL
C ^
..
m 0
o
? ?
0
o o
0
L .C C O
?= U
II II II II
a3Q?
•
•
•
•
•
VI-35
o?
U ?
.a
w?
+lw C?7
c
0
U
March, 1993
ROCK SILT SCREEN:
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 strearrr -
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
I°
z
Z
m
m
LL
O .
. _ d
W
>
N
O O
W
U)
'
m
J
z
z
Q
m
0
D-
o
J W
.a xa z o?z
E
caE wz oW Quo
Vnzz?-a0 F
w0d¢WO ?OwU Lx.
oZM¢W °WJ
04
z? 'cerl)
00?0? W rZ? ?fn xQ d
CoW04 = L.p.? E.Oaz; E-w
?Lo dOZC:jW
dO?dZIT. U°ZQOZ
roc= ?a?w- _.,Z WE-O- ZW
x ? z_ z Qxa??
E-.w wE- OwW W ZE- W
?o o w?U) ?mdFQ ? °2m
<x E- 04J1:4 ?Q.7 W d l?X.]dx
w V) Z ¢ z ri) w
E-?zdVW2dZp??ZQE-
O a
woxoo -' xE- C) 0x0 x1: w
Z W U V)UE- U v)v)Cz a U V1 ?q
VI-25
3
W
L -
F-
z
D 0
x
- LL
K
C
z
A
J
z
W
.LI 11
rr
u
Co
U?z
V
U
o p??
X (n
M
LLI
zZ
o z
o
?-
Z?
.. 1
v
a
¢
H-
U r
nn
VJ
t
u LIJ i
L; N i
.-
` O z
NLa
_ U 0I Q
,;,I QI
z
0
I (n
-'
¢
?
z
-
?i
II 31
W' O
JD
z I pi Ti
w
cn
March, 1993
a.
J1.
G
n M
q
c