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HomeMy WebLinkAbout19970340 Ver 1_Complete File_19970422State of North Carolina Department of Environment, Health and Natural Resources al7i Division of Water Quality James B. Hunt, Jr., Governor d1ft Jonathan B. Howes, Secretary I E H N 1=1 A. Preston Howard, Jr., P.E., Director April 25, 1997 Jackson County WQC 401 Project #970340 APPROVAL of 401 Water Quality Certification Mr. C.R. Styles N.C. Dept. of Transportation P.O. Box 250 Bryson City, NC 28713 Dear Mr. Styles: You have our approval, in accordance with the attached conditions, to place fill material in acres of wetlands or waters for the purpose of improving SR 1157, as you described in your application dated 16 April 1997. After reviewing your application, we have decided that this fill is covered by General Water Quality Certification Number 3100. 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. 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. 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. Also this approval will expire when the accompanying 404 or CAMA permit expires unless otherwise specified in the General Certification. 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 Domey at 919-733-1786. Since ely, LTD9'( ton Howard, Jr. P.E. I- Attachment cc: Wilmington District Corps of Engineers Corps of Engineers Asheville Field Office Asheville DWQ Regional Office Mr. John Dorney Central Files 970340.1tr 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 • h ?J 0a_Q L?t1-' a $TATE 970340 STATE OF NORTH CAROLINA DEPARTMENT OF TRANSPORTATION JAMES B. HUNT JR. GOVERNOR Jackson County SR 1157 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 P. O. Box 250 Bryson City, NC 28713 April 16, 1997 401 ISSUE[) GARLAND B. GARRETT JR. SECRETARY RECEIVE QPR 2 2199, -"VV/RCNMEMgl SCIFNzs The North Carolina Department of Transportation is proposing to grade, drain, base and pave primarily along the existing roadway of SR 1157, Cullowhee Mountain Road, in Jackson County. In order to construct this project in accordance with our current secondary road standards and due to the replacement of eight (8) pipe culverts and the extension of two (2) pipe culverts in several unnamed tributaries of Cullowhee Creek (DEM Class C-Tr) we are requesting authorization under Section 404 of the Clean Water Act. I am sending a straight-line diagram with our proposed erosion control and construction limits at various sites along this project. In addition, a typical section of the road, drawings for the pipe extensions and the pipe replacements of the unnamed tributaries of Cullowhee Creek, general notes and standards on erosion control measures, and a marked County Map are enclosed. We propose to install the new culverts slightly below the existing streambed elevation where bedrock is not encountered to minimize impact to Wildlife habitat and allow the existing stream 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 controls are being effectively controlled. If the planned devices are not functioning as intended, they will immediately be replaced with better devices. The silt fences and other erosion control devices will be in place prior to pipe construction and will remain in place until the project is stabilized. 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. N aHMaN 'ls!6o!o!8 sa!aays!3 JolaIs!a `MO), P!nea 'aW W3a 'i!un uoijeoij!jjaa Aj!lenp aa}eM `gweleO ola3 'aW aa9ulbu3 leJuawuoalnu3 aP!speoH eaay `al6ul -1 .3 •aw aaau!6u3 uo!s!n!(j '•3 'd 'u!IJeW 'a 'd 'aW HNH30 199u!6u3 leuo!688 "3 'd 'sd!ll!ud Paego!H 'aW :oo •e:ge Ps:SHa aaa , u3 Pa}s!a .3 . s !AJS 'H 'a J `Alnal sinoA •parepaidde aq ll!M uolleaap!suoo pue M91AOJ Apee ino), •aslnpe eseeld 'paa!nbaa sl uo!lewiop aayljnj dl •elq!ssod se uoos se uo!jonalsuoo uibeq o} aM!l plnom aM ?sanbaa 1!waad s!yl bu!uaaouoo aw of Allowip puewwoo of `(HNH3a) sd!ll!ud paeyo!H 'aW pue '(lOdaN) aaau!6u3 !eju9wuoa!nu3 ep!speoH eaay 'a!6ul p3 'J N pue WHOA •aw 6u!Mse we i 'uo!}!PPe ul •ju9wa6euew lelu9wuoa!nu3 ?o uo!s!n!a woaI Joy J91LM aeala ayj ?o Lpb uo!joes aapun paaooid of uopzlaoyjne 6u!lsenbaa we l `aa al s!yl jo Adoo Aq osly L66 L '61 yoaeW Z abed uosugor qo8 •aW DEM ID: ACTION ID: Nationwide Permit Requested (Provide Nationwide Permit #:): 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 Department 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, P. E., District Engineer 5. Location of work (MUST ATTACH MAP). County: Jackson Nearest Town or City: Cullowhee Specific Location (Include road numbers, landmarks, etc): SR 1157 - Cullowhee Mountain 6. Name of Closest Stream/River: Cullowhee Creek 7. River Basin: Little Tenneesee River Basin 8. Is this project located in watershed classified as rout SA HQW, ORW, WSI, or WSII? Yes [X] No [ ] 9. Have any Section 404 permits been previously requested for use on this property? Yes [ J No [X] If yes, explain: 10. Estimate 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: 0.02 Ac. Drained: Flooded: Excavated: Total Impacted: 0.02 Ac. 12. Description of proposed work (Attach PLANS-81/2" x 11" drawings only): To widen and pave SR 1157 to meet current NCDOT standards 13. Purpose of Proposed work: same 14. State reasons why the applicant believes that this activity must be carried out in wetlands. Also, note measure taken to minimize wetland impacts. See Attachments 15. You are required to contact the U.S. Fish and Wildlife Service (USFWS) and/or Nation 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[ ] NO [ X] 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 a copy. E. What is land use of surrounding property? Rural Woodland - Residential F. If applicable, what is proposed method of sewage disposal? Owner's Signature ate °rtGIG t ' `? w,• ` IB PAS JF? ?' il? ? ?C wer/r IIf! S •• , ? L yl rty dlo .rh•° } ?, '? ? lllE 1214 r -4 » IIJt ? 111E ?° 1172 Itfl S 1571 Jul C1 k 7 d Cli, 11L Eorl Lessors un IZU 1 U J ? v l li lockBe?nr uL rSS?. _ , 'o lI!! • P R r t t Akparf Lut,? ? J If /` .j0 l7III ;y ° nu 10 ? 1 c^? uouGtµ 'S COWS! RAID v lllJ 1717`1 ., 1yu I? ILff J4 Em. SAGS ll? L1Z1 -7 Jrii rAS 1?! ttl °O lltt •?• - 17 ?IElB ?7 _ SP••dr•G I _ • Tockas.p•o 281 Gdw 1 -d a J ? .t U Ull ? ?. ?ANR19 KHOG .G ELEV. 4,010 i? C") !!3! •/ , - • 1114 179! ili lu f i • ± yy u" mt M I 1 ? ,\ - CEDAR CU19S L 7 ?+ 1 n m 1141 ? ? ? ? A E EV. 7,17 "lye i ''b.P \ j1y M ?;y r 1111 ? F 1 ( .,d SUCK KNO ,,?(?`? G B CHERRY ' 1 KNOB 292 r 4 LEV . ji .. ••'11 _ SHEEP KNOB yy ELEV..,,.. ' 8 .. .9 , E . ?•?•?. ,i J1n1 i ?? /S Otb> 7 C,Ke y ff•??? MOSS KNOB A t -- `' , •pOr'?u,os ? 140, ?,.t 1 71 ( N.r Ile ' i7 1]40 Lff ? r} MOT Mt SO SS•ti 11111 EAGIA .` KNOB 4 ? L14 •G 107 1!19 " TUCXASEGEE p/ D° h1i lzu f? ?., ------ ,? Our / M FALLS 7 it 1117 IIJ? OR, r 1LLt It y ?( fall Loporf 117.i h LL] < 1921 im 30 E 0>?9 Ulu .7 J' !U1 t KIM. OlD MtH 1N d( 1L7 ° •+ 11li ,• - TfIORPE •• L . . ERVOlR ®?. ,/_ SHOW MIN HEV, 1 3,491 f U." r J u 1 7 9r `4. lLfi 7 ,0 3 LLSB 1 `\\ t!li Jp .0 6 y A . uu 1111 )!fi ' ILfl llit Rek L ? C S•t0' illl 1 S M.- E,EV 4 930 U11 Y•11.w Mk O ?4 11lf LL1 UJI ON O , sm aaK LACK BOCK uu 111E r'rJi J GAP , •J) MTH. 7.4 7.1 Ad ? " Y ?. YELLOW MIK \, Il?y \y1? EIEV. S,I?S Al°c/ ? ,1 °A /hLi ?6 Y Lin 1114 ^: / I B U I t u!1 r J ?? 10 IBOHLAr/03 CO W tE .ST LAPORT GAP r i HIGHLANDS•, ? ? 341 POP. °33 1.121 MACON CO. °33 [ y JACKSON CO. 0 p KLY TO COUNTY ROAD NUMBERS ALSO MMNKS 1491.1442 5 r K? ia98 12'30' v 1 , i I o Kn ??' ??' ,„• 600 ?n1 1 T L r-,p % all 1 1 P- Li 0 JAL Lo TENNESSEE VALLEY AUTHORITY MAPPING SERVICES BRANCH 1 300 (Sy11va S uth 175-SW) 302 (?7 7C, Y i `--[? ?? v ? iA I fir. JAr -?J ? \ •?? ? J I/', •;; /(???/,`?/i/1% ) ?+ 4; Do j e 3 _?- , L-A:° ?? ?• J ? ?-' 1 ,?/p,.,? , ? ? ? 19.x,/ ' r.;? 'yam ,;, : l ? '/? . F LK I _, 404 j ti.•, \?? f Y• „a lE prii4g?ch ?\ /??/ n • ? n u „r 1! Ij --"-.. ? "sue-/;, ?-- xj F4 /' AIN ??J/1 '??? I?v ! _/sI ?? III/yr?' ? • , ?/ C/ V,4- a,iso,? Co. ROAD NAME CN 11o ad eg Y'NZ?A?. S.R_ W.0 //S'7 - ?1 9? ?/39 FROM L'n.n/ eF ?A??tif ?',? 9?0 No.- To ?N? of PcrarrvT ADD ITION IMPROVEMENT TO BE PAVED P POLES TO BE MOVED 2 T. POLES TO BE MOVED R /W WIDTH ?O - SCALE I" =-50.D 9(i 3' EROSION CONTROL DETAILS AND. SPECIFICATIONS Std. # 245.03 D .s .ri flon Sy Temporary Silt Ditch ; mhol 245.05 „ _,.._,,,,,••_•,,.,,,•.•„-,o Temporary Diversion 893.01 ............................. .__? Temporary Silt Fence ........... ........ H! H To --- - 890-05 Temporary Slope Drain with Earth Berm «- +- 245.01 Slit Basin Type A 245.02 Silt Basin Type B ,•.•,,,,, .................. 892.04 Temporary Rock Silt Check Type-A 895.10 Temporary Rock Silt Check Type-13 ,,,•,_ 892.01 Temporary Rock Sediment Dam Type-A ,,,,•,,, 892.02 Temporary Rock ' Sediment Dam Type-B ;,- 897.01 Rock Pipe Inlet Protection Type-A 897.02 Rock Pipe Inlet Protection Type-13 ............ u 894.01 Rock Silt Screen ............................................. 245.04 Stilling Basin • ............................... Rock. Inlet Protection: 896.01 Type A ............................... A • OR --A 896.02 Type B ............... ?.......... :.... B []-'OR -• B 896.03 . Type C .......................... ......... C ? •• OR •• C ?? 12 March, 1992 .. Railroad ..: '.' ........................ --- „ C Control of Access Line.... • • • • • • • •. • • • A ine • ..................,. Slope Stzlcc Line'.* :_ -Bridge. ; :'.•.'. ,:...*.::•• ..'.'................ Cu l .. ---- , verh,. •... •.• .•:.:..'.. ..: . ........ . 0 JO b+() Wooi?s ....•.. .... . Telep11 Ile nr,Telc, raph Pole ......... i t:?tS'' -o- 1t'1(ot' ••O• t Tower PoleandLine ..., .•••••••••• It:\I5'I• S 1 If?lc(?l' .b Power Pole .. ' ::.................... . _ Easenicii' Line. .:,::...:•:..... ........: ilyfowin Liniit •.'.?' .................... . Guard Rail ............................. Sanitary. Sewer-Line ................ , .. -- ?- 't-- Water Line..".*, ................. • Gas _0_____ Gas Line ................... I1icOVusr:D r:xtS•rtvc Chain Link Fence-' ................... -13--m- - D--O-Woven Wire Fencc•:.. e .. ............. Recieneracion....'.........•..r• ...... ' •? ••? Rerorestatlon ': ........................ ?., Temporary Silt Ditch .' ............... •---° •t:y?i ?•yn?--- 0 9 f...._- I ?- ., ..............: -Fn Teniporarv Sitt Fence ' Teniporat:y.Slope'Draill• .:.......... • • . • 47 Brush L•lrri??r •"?'' . .'"'5?? - Silt Checlc Dam Type A ............... n Silt Checl: Dam 1)pe B ..'........ a ... . Slit Basin 1?•pe'A' ...:.:'.. ..: . . . . . 0.0 0.0 .' ~-? • Silt Basin TSj)e B . • . . • ••. . :•. . . . . ... . . Roclc Silt Checlc Darns ............ • : • . • . Ir;arlll Dcrn1 ....'......::.;..•• ......... Temp, Slone Ditch Check ......... yrtl..l 1a C..Ibr s? Jtit?ilil? QC15;li? ? '? ? • . --------?-•---??._.__._? J?F" S /GAI' /••"o/L 'S/C f---,lj/?S/•? ? --.?/'Jl: ? .?, ..emu v ?•- ..= +y??,??v ,EVE.ey STD?f?}) E'I/E'?!r dwp G?LE,??V6.U dUT cUf,'FIt/ f//LL - 3 7' zVd T Td . S C4 L e (s. B, 7) 21 AEA i EX?rH of iisri/h'/3Ey A?eE/r boo -• ?- S1pN U ONLY . s-ir. ?• 1,i1s•?? - 3 may. `'?? 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I L51011-10-1 I 86 f 00 g o f a? ?9 qo ? o0 g,s.eo° i a. 7w L5of 1._I ?r?MEs ,1302eMAi? a i8 y'5-Aov -?-5 y5 Gov i 93 ? 00 R. of ,PuT/,q„,o/ 84/ Z3"", Ave. New sMyg^lq Ee4cX, 1-14 z? 320 6 9 3 s f 1 90 f ss I 94 ?laO qo '` ov 0 CtlESTEit C?Aiv?i?A U?viVtrs? ??, 22 3I I cJ 93/00 /DD ? 0 O wofo? cAie p=er 3 f 9 t I N_?r 9S i00 O I ZI I I L5 I /00 f OU LL I I ' /00 ? DO 4 eo y Mew W %lliA 8Z /?/?iNG ?• W ? CooPcQ- .Sy/UA iv_c . 5 p-? P o. BoX 1170 O Ca//o t..4 e e, iv G . 2f /o9 t00 /o9 4-00 J? I 6 b 22 22 I I I L5 0" -?- I 18' . /0 5?0o /off o0 f?O. rBox 2G6 V -?- C'u//oW/le ZS 3 + a. I I , 00 ZS 5 0=-? I I M I 1//o 400 120 7'00 aI . I? I //Poo kx a 1 ?I . I` 0 -+-5 I L5 ?ZO +l DD I --fvI I 112o goo O -?-5 ioc., V I 1 ' 3 c? ? • I I ? I L5f 0, -?.. ? X25 t So /2S goo 112S foo _. KT ?R p+F?„? ?1. . I .9 1 -?-5 ® I l3z ?- Go 3 0 5 /.S T W . F?Ed G'ocC?'w s ,et, G Box 14? e, /1oG,,4ee N_C , Zip ^MP ?f 3 s /e3a foo 0 t f ?7o -0-5 /'I/O 11U° 2?v 3 Il8 I " L5 /35 tQd ?7C I. I /3Sf ? Imedlc Vy6X C - 13o z 7 ?v6,-oo,e 2d, Oc%A?70W?MD. Z///3 ??f5 tvv -#--5 0' Of -r-) r-- - TI t 50 I I L5 I S?Z So I I /4?o f vo . .,laid All P. O. Bo X /0 3 GFIsl? ?.e s? Svc , 27 2(p / So taU T i I I 26 ? I I I L501 ? I /y5?o0 l?s?bo EROSION CONTROL DETAILS AND SPECIFICATIONS 245.03 245.05 893.01 890.05 245.01 245.02 892.04 895.10 892.01 892.02 897.01 897.02 894.01 245.04 896.01 896.02 896.03 Temporary Silt Ditch - ?o Temporary Diversion ro Temporary Silt Fence 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 ........... u Rock Pipe Inlet Protection Type-B Rock Silt Screen .................................•----..._... Stilling Basin .......................................... Rock Inlet Protection: Type A ............................... A E3-- OR -- A LL " OR Type B B B Type C ............................... C Lj -- OR " C 12 March, 1992 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 = 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 a. I III z!m I? m d II 1 x III = Uz a LLJ III wH U . - W z W ? ------- -- -- zo v? a? of z z ?-- J rs= f, d a w ? O >? w W IIII F woe E., z ? W d III Q ?x x d m CL III- ? zz cc W _ CL. III ? ?- z o A e m CL pp- ? ?? C ? ? d ? w L• 4C W F W Z ?1 . ] CV ?_ C W Cl) _ F z F - - ?- -- Z 3 G4r W Zd O W W C, O r- F ., C ? ;rl OW W.? a W o ?v) acq m O = z z WW Z A CO x jA?»VM aF" W. ZEE Z C4 Q ?- Z ddb x dF--3Csfj W d dZ x-- Ws dW oCL C23MM rJSSxs y, W N Z z JAW Q:AWF m Im ?C7 adzd3 - 3c ?m mmW O WI ? C7 ru s W ZA adF cnsz oC A _ u?t 10 - O0 W A ?ZF?WF wxW z 0l?-x W N C C F3cc rs]ft7V GO O zm V O zwa. w, zL='Mz cwi? d-3 Z ow Or, o =d C >I N -3 a. a W EO Cx UT s I °z? al 18 March,1992 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) 23 March, 1992 (OPW 4hw. i4ftv - L's1 al p N Z m F v 'n N a 111111 ) `7? ?? IIII 11111 _ 111; ,, 1)) F ")\ )' ???" 1 ? a 11111 w ' 1: 11111 1 zv, y? ) " 111111 Z ? ? a Jy)??? ?\ - .0 L - d ;"? ih) IIII Q `2J a )_? - g VIII °° zxz VIII a oow LL ") a - 11111 w N Z Z "C i 11 1 1 _ W O o^ \o"r?; - ? = Q Fp -?",•?>) 1111 I J 11111 0 •e v r. )? r ? II I II 111111111111= av^ \Z„fit \\y.r 'WA d - - (n \\' \ (IIII ? VIII \„;;,y ?.i?;) ?? 11111 ? 111111 Z Pi ? $ m of E i ?i 0 °zl 24 March, 1992 ROCK PIPE INLET PROTECTION TYPE-A: o 10h A rock pipe inlet protection type-A is a horseshoe shaped structure with a built-in sediment storage area around the outside perimeter of the structure. The type-A rock pipe inlet protection shall be used at pipe inlets no larger than 36 inches in diameter where it is receiving flow from several directions. The type-A rock pipe inlet protection utilizes class-B stone lined with #5 or #57 stone to protect drainage pipe structures by trapping sediment before it enters. They have a sediment storage pit which is designed by the same procedures as a silt basin. AREAS OF USE: • At inlets to pipes no larger than 36 inches in diameter where it receives flow from several directions. • In areas where it can be cleaned and maintained on a regular basis. DESIGN CRITERIA: • Structural stone - class-B stone • Sediment control stone - #5 or #57 stone • Sediment storage area - 1800 cubic ft./acre • Dam height - 3 ft. minimum flw? 33 March, 1992 ROCK SILT SCREEN: M Mw 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) Q, 37 March, 1992 N - - - - - - - - I `+ } y :} Ou _J J 1t, w l? W o- . W 1-0, , 1 ? lWL p ` ? cp O U _ t? 1V ,..r JJ 1 Cf) W U ? Q pow 0 f a W W F Z ad ?W z?°z?- ddb ¢ 0 x O WZ OlndpZ Ox0 0. W Fa FG.0 1- Z Z OddWUol u C) ata. ? 0 z A O v Z O Q ? CO a Im d zV txu 0 0 m0aW WW ..]F? F? + l Z rn CI) V) Z dZ 0. W W C 0 EY _ ?? w ,z W 0 aaaioe-0 C) O O O Z d 0 d d Z V O O Z°r ? fL'[a.3CL ?E ZOW ZW O 1 o .W.. WE-OWW WZFw =)W> E 3 2M : and amu N C v p , E-. 11.- UZ V) dx a > p a ?Op r O vstcr 1 V ea ) aW o a xa W FaE- V)U3 QZ V E--d a F C y/? 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