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HomeMy WebLinkAbout19960459 Ver 1_Complete File_19960509State of North Carolina Department of Environment, Health and Natural Resources Division of Environmental Management James B. Hunt, Jr., Governor Jonathan B. Howes, Secretary A. Preston Howard, Jr., P.E., Director A& * AM Oki I D FE F1 May 16, 1996 Jackson County DEM Project # 960459 APPROVAL of 401 Water Quality Certification and ADDITIONAL CONDITIONS Mr. C.R. Styles N.C. Dept. of Transportation Bryson City, NC 28713 Dear Mr. Styles: You have our approval to place fill material in 0.02 acres of wetlands or waters for the purpose of constructing roadway improvements at SR 1107, as you described in your application dated 3 May 1996. After reviewing your application, we have decided that this fill is covered by General Water Quality Certification Number 3026. This certification allows you to use Nationwide Permit Number 3 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. Applicant is reminded to use High Quality Waters Sediment and Erosion Control measures for this project. 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 Environmental Management under Section 401 of the Clean Water Act. If you have any questions, please telephone John Dorney at 919-733-1786. Sincerely, Attachment cc: Wilmington District Corps of Engineers Corps of Engineers Asheville Field Office Asheville DEM Regional Office Mr. John Dorney Central Files Rto4noi;ar, Jr. - 960459.1tr Environmental Sciences Branch, 4401 Reedy Creek Rd., Raleigh, NO 27607 Telephone 919-733-1786 FAX # 733-9959 An Equal Opportunity Affirmative Action Employer • 50% recycled/10% post consumer paper I T 401 ISSUED 960459. STATE OF NORTH CAROLINA DEPARTMENT OF TRANSPORTATION JAMES B. HUNT JR. GOVERNOR Jackson County SR 1107 Mr. Bob Johnson 215 Army Corps of Engineer Reg. Field Office Room 75, Grove Park Ave. Asheville, NC 28801-2714 Dear Mr. Johnson, DIVISION OF HIGHWAYS Bryson City, NC 28713 May 3, 1996 GARLAND B. GARRETT JR. SECRETARY The North Carolina Department of Transportation is proposing to grade, drain, base, and pave primarily along the existing roadway of SR 1107, Whiteside Cove Road in Jackson County. In order to construct this project in accordance with our current secondary road standards, and due to the proximity of trout streams (Norton Mill Creek, Green Creek and their tributaries, DEM Class C+ Trout), and extension of two (2) pipe culverts and the replacement of two (2) pipe culverts, we are requesting authorization under Section 404 of the Clean Water Act. This permit request is in addition to the request dated October 11, 1994 for SR 1107. I am sending a straight line diagram with our proposed erosion control construction limits at various sites along the project. In addition, a typical section of the road, cross sections, drawings for each pipe culvert extensions and replacements, general notes and standards on erosion control measures, and a marked county map are enclosed. We propose to replace the new culverts along the existing streambed elevation where bedrock is not encountered to minimize impact to wildlife habitat and allow the existing gradients to remain as unchanged as physically possible. The best management practices will be used to minimize and control sedimentation and erosion on this project. The construction foreman will review all erosion control measures daily to ensure sedimentation and erosion are being effectively controlled. If the planned devices are not functioning as intended, they will immediately be replaced with better devices. The rock silt screen will be in place prior to pipe construction and will remain in place until the project is stabilized. men t 7 • Mr. Bob Johnson Page 2 May 3, 1996 By copy of this letter I am asking Mr. David Yow, North Carolina Resources Commission, District Fisheries Biologist to comment directly to you concerning the 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 Division of Environmental Management. In addition, I am asking Mr. Yow, Mr. Ed Ingle, (NC DOT), and Mr. Richard Phillips, (DEHNR) to comment directly to me concerning this permit request. We would like to begin construction as soon as possible. If further information is required, please advise. Your early review and consideration will be appreciated. Yours truly, C. R. Sty es, E. District E weer CRS/wmt cc: Mr. Richard Phillips, P. E., Regional Engineer DEHNR Mr. F. D. Martin, P. E., Division Engineer Mr. E. L. Ingle, Area Roadside Environmental Engineer Mr. Eric Galamb, Water Quality Certification Unit, DEM Mr. David Yow, District Fisheries Biologist, NCWRC Ms. Erin Bronk, Highlands District Ranger, USFS DEM ID: ACTION ID: Nationwide Permit Requested (Provide Nationwide Permit ft 03 JOINT FORM FOR Nationwide permits that required notification to the Corps of Engineers Nationwide permits that require application for Section 401 certification WILMINGTON DISTRICT ENGINEER CORPS OF ENGINEERS DEPARTMENT OF THE ARMY P. O. Box 1890 Wilmington, NC 28402-1890 ATTN.: CESAW-CO-E Telephone (919) 252-4511 WATER QUALITY PLANNING DIVISION OF ENVIRONMENTAL MANAGEMENT NC DEPARTMENT OF ENVIRONMENTAL,HEALTH, AND NATURAL RESOURCES P.O. Box 29535 Raleigh, NC 27626-0535 ATTN: Mr. John Dorney Telephone (919) 733-5083 ONE (1) COPY OF THIS COMPLETED APPLICATION SHOULD BE SENT TO THE CORPS OF ENGINEERS. SEVEN (7) COPIES SHOULD BE SENT TO THE NC DIVISION OF ENVIRONMENTAL MANAGEMENT. PLEASE PRINT. 1. Owners Name: North Carolina Dgpartment of Transportation 2. Owners Address: P O. Box 250, Bryson City, NC 28713 3. Owners Phone Number (Home): (Work): (704) 488-2131 4. If Applicable: Agent's name or responsible corporate official, address, phone number: C R Styles 5. Location of work (MUST ATTACH MAP). County: Jackson Nearest Town or City: Cashiers Specific Location (Include road numbers, landmarks, etc.): SR 1107 - Whiteside Cove Road 6. Name of Closest Stream/River: Chattooga River 7. River Basin: Savannah River 8. Is this project located in watershed classified as Trout, SA HQW, ORW, WSI, or WS II? YES [ X ] NO [ ] 9. Have any Section 404 permits been previously requested for use on this property? YES [X ] NO [ ] If yes, explain. For previous ape replacements on SR 1107, Permit dated October 11, 1994. 10. Estimated total number of acres of waters of the U. S., including wetlands, located on project site: 11. Number of acres of waters of the U. S., including wetlands, impacted by the proposed project: Filled: .02 Ac Drained: Flooded: Excavated: Total Impacted: .02 Ac 12. Description of proposed work (Attach PLANS- 8 1/2" X 11" drawings only): To widen and ave 13. Purpose of proposed work: Same 14. State reasons why the applicant believes that this activity must be carried out in wetlands. Also, note measures taken to minimize wetland impacts. See Attachments 15. You are required to contact the U. S. Fish and Wildlife Service (USFWS) and/or National Marine Fisheries Service (NMFS) regarding the presence or 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. Have you done so? YES [ X ] NO [ ] With Application RESPONSES FROM THE USFWS AND/OR NMFS SHOULD BE FORWARDED TO CORPS. 16. You are required to contact the State Historic Preservation Officer (SHPO) regarding the presence of historic properties in the permit area which may be affected by the proposed project? Have you done so? YES [ 1 NO [X 1 RESPONSES FROM THE SHOP SHOULD BE FORWARDED TO CORPS. With Application 17. Additional information required by DEM: A. Wetland delineation map showing all wetlands, streams, and lakes on the property. 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. If a stormwater management plan is required for this project, attach copy. E. What is land use of surrounding property ? Woodland - Residential F. If applicable, what is proposed method of sewage disposal? e-? S 3 Zt?e Owner's Signature D P,nA Q NAME WHITESIDE COVE i S.R. 1107 t W. 0. (;.gG213q FRO iii S R 1109 101800 TO MACON CO. LINE ADDITION IMPROVEMENT TO BE PAVED P POLES TO BE MOVED T. POLES TO BE MOVED 01-v W l DTH SCALE DAT_. REVISED 2-7-94 3Ev I SEo g •18-q b 0 501 5 0 10 - 20 - D4 R EROSION CONTROL DETAILS AND SPECIFICATIONS 245.03 245.05 8931.01 890.05 245.01 245.02 892.04 895.10 892.01 892.02 897.01 897.02 894.01 245.04 896.01 896.02 896.03 Temporary Silt Ditch .,,__,,,,,, -T SD Temporary Diversion ....................... TD Temporary Silt Fence .................... Hi. ff- Temporary Slope Drain with Earth Berm -...... Silt Basin Type A ................................. -0 Silt Basin Type B ................... _______________ Temporary Rock Silt Check Type-A Temporary Rock Silt Check Type-13 -,____,__, Temporary Rock Sediment Dam Type-A ............ Temporary Rock Sediment Dam Type-B ,„ Rock Pipe Inlet Protection Type-A . ----------- a Rock Pipe Inlet Protection Type-B, .... ;....... Rock Silt Screen Stilling Basin ........................................ Rock Inlet Protection: Type A ...........................•••• A a.. OR Type B ......... ...................... B E1.7 OR B)) Type C ......... •••••••••-•......... ., 'C Q•• OR •• C)) 12 March, 1992 cl of Access Line.' .............. -- a Slop- S't:alce Line ................ •. ?- , L! V C. • .. , • O or . ' IQ otli Pole ... ..... SI• -o- , WHOP --0- v, 7 Pc :e and Line... ....... .... . ?' ?? ° .?..•.... .. .......... , 0 Nva -Pole ,F.,NI5'I' 4) ) I!''ItC?(' b 1 . .1jaSe ll(:I:L" Line.. ..................• - :i ?0 •PIit' ' 7 1 T T l • isu1 d 'Z;.!i? ....... ................ . ??.-?•, S P N er Line. ' ' ' • . -? ? _-' 1 . • ..... • .:....,. .'.... . ??% ??=• Ling .. ?., : .. . . . f:X1S•i'1NG -ace J . _ 1!'V SilC DlCcll • • • • • • • . ?:,col'?iI•v.??lt I?cilcc? llporary.Slope'DI'? i1 .........• :..:. C'lec1< Dam'Tyj)e A•.• .............. 'A Chcc< Dam 11?qpe B ....... ? c:: (? be .'? . . . . . . . . 5 i Ty-p . G C C.c.-c•1-i - s!r e B ..'......... .K. r Sill. Chccl< Dam ................ . . ... . . . .. .'. . . . . .. . . . c ,,c' D l •Ic,n Check ..... .. .' .. G Y 5+00 5+00 l6cmp FRED PICKLESIP:1MER ` EDITH PASSMORE 132+ WES i NUNS ER DR. BOX 124 GPEENV ILLE, SC. 29606 CASHIERS, N.C. K E N T I•i S t,.' C A K I'- 2 1 0 EDV%'ARD ERYSCN F E OX 957 KIGRAVIAN FALLS, N.C. C13), -.--5 4 + 20 4+00 2,+ 60 3 t? 0 - 60 THOMAS PICKLESIMMER RT. 2 I-{IGHLANDS, N.C. I? o --- 00 c0 - 60 ?SHELDON DANIEL 0 4028 SOUTHWELL \V" SARASOTA, FLA. 344_41 0+00 R R 10 + 00 -s? 10 + 00 C O ALMER SERVICES INC. 18 P 0. BOX 16411 ST A- B GREEN`,/ILLE, S.C. 20606 0 0 5 C61 c? 46' i 5.001 CMP 0--,- L?? CMP 0is.oo LOIS MORRIS P C. BOX <"J5 -'YLVA H .C. O O 15+00 A B e r 5 : 15 + 00 r 1 6 e b kcr. i 1 18 CMP 10.001 a 10.00 O _• "iOl 19+9520+00 0? liq a f ti G P 5 r 0 c 15+0O 20+00 JOHN PICKLESIMMER 650 LONG LEAF ACMES DR. WILMINGTON) N.C. 28405 Iq-+ 10 DOUGLAS IRWIN CAROLINA ES a"A T ES PO.BOX 694 DOUGLAS, WY. 62G33 t O 9 cr !16 + 20 J f 0- f 15 + 00 O k 25+00 I25' 00 5 O-?? !? 0 _ + 00 i0) ! io ---s o ?-4c P I C?,O 0 20 +C`Q .20+00 li 30?G0 ?30r00 v ?I CHARLES 4YILLIAt:iS 5 150 CRITTER RD. FLORA, MS. 39071 12 io b 3I 36 CMP cr i 6-90 -t---5 25 + 00 0'x.4 25+00 0 35'+ 00 1.- 5 ?o e 18 i I-?s 30+00 35 + 00 CMP 1 owl I30-00 ?2 DAVID FOSTER I. C. BOX 4G7 CASHIERS, 1 J.C. !II 40+00 cr- 3I ,35 + Co ? I RONALD CANNING 285 N.W. THREE SISTERS DR. BEND, OR. 97701 13 I1 1 ; ? kcr-- ol I35+00 12 P- CS•00 y` ^50 q i lz oc 40 * 00 45 + 00 ROBERT GOODWIN II C/O TOAD HALL FARM 4993 HEREFORD FARM RD. EVANS, GA. 30609 14 STA.43- 34=45+ 61 WOODEN FENCE TO 13E MOVED C!FF RAV BY PROPERTY OWNER •• •4 ? + U CMP CC ' 13 I40 + 00 jp_ 50100 I WILLIAM SHAW 711 LONDONEERPY PD. ATLANTA, GA. 30327 16 I ,50 + 00 'I 18 CMP MARTHA GOODWIN. C/O.TOAD HALL FARM KT 147-00 ?a 4993 HEREFORD FARM RD. EVANS, GA. 30809 IS . L.5 i 45 -OOI 45 70 ? 14 FENCE TO BE MOVED 4 5 -00 IL IL F 55+00 5 5+ 00 v 18 C.M P C ?u VCID 1 6 e ?r j ?L ! STA 51+95 = 52+00 i-1 REDUCE R/W TO 19? RT, OF CL FOR ROCK COLUMN -• -5 0'-} 50 t 00 50+00' n + 00 0+00. i?-5 01-- i JOHN CASH 4170 -'FELL RD S.V. ATLANTA, GA. 30331 zwcmp + 1ifto 1 I ?$ 00. i R +4 3 r I i -•-5 5 5 OCR i Iss? o0 16 C 1 4 L C 5 + U.J .<-- 5 f i 6 5-00 19 P,4+ qII) 0" RUDOLPH BAKER JR. P 753 7RIPPS CT a• AUGUSTA, GA. 30900 18 1 iL LL I 1 24"Ch1F r tee--5 0 ?i• I GO + 00 60-00 HEFFIELD NDS, N. C. 19 021 I 75 + JO -f- 5 70+00 7 5 + 00 r ? .a CMP ?tO I -4--5 0'-a- I 70 + 0 0 • .a w - is EGA,YAP1Y'° EI`-,,FPJH r EOX 1030 1- IG-11LAI CS, fl. ;. Q23, C2D 80+00 1 5 f i 77 l cl: i I-?5 75*OOI _ 80 + 0. 0=4.' + 0., 01 o-I U.S.FS 24 i HONlAS CLARK I i P a BOX 1916 CASHIERS, N.C. - 22 I O T 75- 30 75 -1- 00 19 0 R • SJt00 85+00 --- 5 0 -? EEIli E!! KHIGH7 G?? PEI, '\C,I PEE S-11 A-Lnf iA GA, f T, 83 + 00-f _ 24 ?r l ?- f (G3 - O, a- ? f &0-001 80+00 90 00 O" -? 90 t GO ss i r? f IISCMP I 1 6 o. S7 + I ,l1_ I 1.1 I LDRED ROB;- I COUNTRY CT. _ r.'NF. E\?C CEVI --I LE, GA-30244 9- i ? /g M P 0? 8 65-01 85+00 55+00 r, 23', i 95+00 i 1 . l.Y u 2y CAPo i 2'? cM P I -50" ?- I 1 90•,00 90 *00 24 J 23 100+001 99+5 0? X100+00 0 -? WILLIAM SPURLOCK R T 2 . HIGHLANDS, N.C. 27 IeCMP v -• 5 0', ?? I 95-+00 95+On X97+25 24 1 314 .. I 2G /g" cMP 18,CmP 100* 35 O -)- I .I ?i 1 O8 +00 , t SI a I 105+ ckl-, i 105+00 - - { fit: -xa?'.N„„ {?„ ;X-si.,??r?'+- `"' ?t -•?`?k? -y.? . EROSION- CONTROL"- DETAILS-AND SPECIFICATIONS C. Std. # 245.03 Description Temporar'Slit Ditch ........... .......... S col. .......„- JW 245.05 Temporary Diversion ---------------------- ------- TD 893.01 Temporary Slit Fence .......... -.......... - .. 890.05 Temporary Slope Drain with Earth Berm ?-- .......... Silt Basin Type A ........................ ......... 245.02 Silt Basin Type B 892.04 Temporary Rock Silt Check Type-A .......... w 895.10 Temporary Rock Silt Check Type-B •----.-,.---.? 892.01 Temporary Rock Sediment Dam Type-A ..... -...... 892.02 Temporary Rock Sediment Dam T ype-B --- 897.01 Rock Pipe Inlet Protection Type-A 897.02 Rock Pipe Inlet Protection Type-B, ......... 894.01 Rock Silt Screen -- 245.04 Stilling . Basin Rock Inlet Protection: LEJ 896.01 Type A ............................... A ? -. OR -' A 896.02 Type B .................. ......:..... B 0--.OR -- B 896.03 Type C ...:........................... C .. OR -- C 12 March, 1992 __ ??•" ^w?i.?r'I??:•??s•rai•:?wsti?n..;?,:???•.y-r:• `•sr?.'?-r'y;'?=?'• NEW- E-? E--4 X11 F O == ^_ W ZZ ' U _c= o Q Z - - C?I ` cr _ 5-1 y :. _ : 14- M=h,1992' ' - ?I 'M TENTORARY 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 no 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 17 . March, 1992 II !' I n,Cf vIs 1 . III A . Z 11I <x a LLI ?I_i lI w? U _ b------, cF LtJ ---? F O z w3 `_' U Q Z. ? ?, •? N Li w I ? ??? 1 Q ?. 1-1 1 J.. `c j X)m ;x ca d 0 C 1 C6 E- ...1 o I I I C I . M CC =+z paa m V .II ? CHG. O? < d C26. Z ( x z a < i= , W tO= w .. Z s z x ?"" O ? c? z E E^ d E W Gs. 1. 0 d ,.., E w s z w ?»?mx x ? ? 0 Q Z? x 3 .3 ed3 r &a -3 ~ <Z x? t,,Z <G760a. xcn? t?xaxs >- y? s. yw '3y? M-0 EA.3 3 ZO! - zc7 F°. t7 a< e3dmo0w ?'et`''- zcs ? z of vs W. - o ? x w w ?wA__IyE „0Wtjc isl C"?Ewf- O v??¢ x¢11 O zcm 03y?.od.G`ca.ea?c?7Z t5.. E c j < Z 00 Ofs.A xd ?. as T E f!1 ? E t, • 2? t 18 March,1992 TEMPORARY ROCK SILT CHECK TYPE-B: -- r 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 CRrraaA: • 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.fL O 27 March, 1992 •• .. • - 1 m W z J m. Z J Q NO=OZz m N000 W mz=w W O Z = m O JUQt-wm• CLW Q z-F- = u- iM WOM ON m1-»u.• w0 Ocl: zxwwo_wo OWN Zcn WF QCI--O¢ _ FNmJ??f-J OUO.= W )* Z ° o J J N 0 V = U a ° ? w w > O 0 0 0 L,, w ~ 3 • W Z Q J CL n IVA O 1. w W 1? ? > m t- i, , O .. W 1 w E- Q ; w m , --- U W 1 1 w ¢ 1 =Z CL M U ==.a ?. O EE-=v J C= p?tl _ ZO ¢ 0- F C= L-3> CL O Q ?C 0 Z O° E., W h 2 F U U J ? w .» 0 W N 0 CD N W N O> LU Cr 0- Zl U ` U m I Qi Q fill o Cn o E RA .1 .i QI 28 March,1992 . • . ROCK: PIPE LDI PgOTECnorq TYPE B: A rock pipe inlet protection type-B is a small horseshoe shaped structure. The type-B rock pipe inlet protection-shall be used at pipe inlets which are 24 inches and less in diameter where there is. insufficient space for a type-A rock pipe inlet - protection with storage area. The type-B rock pipe inlet protection utilizes class A stone lined with 5 or #57 stone to protect drainage pipe strictures by impounding the sediment laden water before it enters the pipe to trap sediment 'I'bis device can also be used around the inlet of temporary slope drains where space is limited at the outlet end of slope drain such that a basin or other device can not be used. AREAS OF USE: • At inlets to pipes no larger than 24 incises in diameter where it receives flow from several directions. • In low flow areas where right of way is limited. DESIGN • Structural stone - class A • Erosion control stone - # 5 or # 57 stone. • Dam height - IS ft minimum. 35 March, 1992 ' •s-a: .^'::;?r •. . y ? ~7' • I i! =ti. `• "?=„ ?r??? wi•L a : ? r ? ? .^'y_. ? ?,,.{; ^ • :..?'S:.?Pf.•:l•,? ? " ? • .:i : M s ir j ?•• t : ..• . . :!rY w ?.. = . :T.•?w.}. ti:i. ... . - ? ??.r? a+..t ???lv?.? a°^?' t' 4.?. .i _ ?ni . ? :. . ? .. • •• • •• j?;;?i.ct!f-.-a:: ,;;T.. ? ? a,C•rw' ' : f:V; r?••.:-*-y : - -..a.-'.. w•r.,•••.-'`• ?fy"?'s?.:wa;.`9[=?._::.9 r ? u ? ' r ? . .?. .r-.??? , .?5"'4.s. .- •ti.r'.7.:'^ • ;.-. `.a?'t w '?-' GS ?248.? (I?Q F? Z : C Cal6 ???-SZfllda ?f/?Cs7 ? V LslQ O GIO C3?N talGl?+. CA ca tOdE-?dUOp?UE- FJ2Cl . ?Q ==rjZZQ==mc-:W= E-07W O -y7Rl=E-W ;;=MU UyQE-E.. j=-4 Q3Z63 6 ?Cy Q W E w V sI0a -ZZ E - L U E0 dZZZtgdpQ?ZGU?2a 0 ?. O r4=000 E-OQO Uf-Z Z Clv7UfU MMCT- G.U 60f LL. t LLI I CL J T . . : y ' LLI X CL <r t , , Q CL 3 ? LL Z _.. Z .s„ J 1 - (L J fn (n { J LLJ Q 1 Izl C Q z t • ' J o u z I-- Oa Z (n Q LL? (A co f- U LLI• cn ' m LLI iZ O f LLI CC Zi CL 0 C:+ L .Z LLI CL CQ ,-. `I•? R' O Q II ? i ? , 1 ? j T F 5 O A M i • t 36 Mar 1,1992 Roca SILT SCREEN: A rock silt screen is a low-level dam structure to be used in streams'beiow 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 & minimum and 3 ft. maximum ( shall not be higher than 1 ft. above normal flow of stream) i 37 March, 1992 0 ..s W _ Z 4 fc?z Cf6ZZ.. 643 ry1 Zf? O E-00,0[7 aE--.0.1 Wa .-C mZW? 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