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Home My WebLink About20110608 Ver 1_Site Plan_20111031t ~ 50' NEUSE _ ~ ~ BYPASS CHANNEL ~ CHANNEL INFORMATION ~ o RIPARIAN BUF E-R~ ' _ _ U \ ~ ~ CHANNEL BASE TOP LENGTH LONG. \ ~ NUMBER WIDTH FT WIDTH FT FT SLOPE S LONG. SIDE TEMP PERM Qto Y~o X10 `0 a ~ ) ~ ) ~ ) SLOPE SLOPE LINING LINING (CFS) (FT) (FPS) ~ > ~ ° ~ ~ ~ 1 3 15 110 4.1 O N O o' 4,1~ 3:1 NAG S75 FESCUE/RYE 4.19 0.29 3.7 ~ o Z ~'c ~ '1 \ ~p FI TES STRIP ~ ~ N~ ENG~N~€ERED ~ ~ MAX GRADED \ 0~ \ ~Z~ GRADED AND SODDED ~ q ~ SLOPE OF 50 \ c~~, y ~ Q ~ ~ i ~ ~ T \ ~ - - - J" \ ?8~ ~ti _ - - - - - - NOTE: SEE "BYPASS CHANNEL INFORMATION" TABLE FOR \ \ )R BYPASS CHANNEL #1 ~ ~ ~ \ ~ MORE DETAIL ON THE BYPASS CHANNEL. \ TEMPORARY IMPACTS ~ ~ Q W J2a~ \ ~ ZONE 1: 300 SF W a o O J Z U CHANNEL LINING CONCRETE LEVEL ~ 2. ~ PER PLANS ZONE 2: 450 SF ~I ~ ~ i e2 \ \ ~ T SPREADER J TEMPORARY IMPACT FROM ~ ~ ~ ~ P FLOW 10.00 CFS ~ PLACEMENT OF BYPASS \ TOP WIDTH C CHANNEL IN RIPARIAN LENGTH 100 FT ~ \ \ B ? \ \ \ _ NATURAL BUFFER ZONES. TOP 284.5 a3. \ \ A roximate 4.0~ Sloe _ ~ - GROUND BASE 284.0 \ \ ~ ~ ~ Mqi \ 30 NTF \ DEPTH OF N\ ANC ~ ~ CHANNEL 70-YR DEPTH F \ ~ I E ~ OF FLOW SPLITTER BOX 1 ~s ~ (2 FT) FMF TOP + - 288.50 N ~ \ 1 SEALS INV IN 285.00 \ ' \ BASE WIDTH ~ O 9 ~ ~ INV OUT TO BYPASS 285.00 INV OUT TO LS 1 285.00 ~ { ~yq 089 ~\t~~~~~~~~1~~~[~~~~~~~~, ~ 284.75 TYPICAL BYPASS CHANNEL ORIFICE PLATE 19.5 0 ~ NTs \ Iv t~ 2 l~,~~F~.SSlOC~~Sp~ 4 ~~r ~j O ~ ~ ~ Z 1 m ~~.rl~. i 284.5 t~ Z 22~~3 r OUTLET PROTECTION \ zs ~ ~ N ~°e.F ~ . 4.5 W X 6.0 L X 24 D 1 ~ ~ CONSTRUCTION SEQUENCE FOR LEVEL SPREADER AND EFS \ ~ ~e AND EFS GENERAL SPUTTER BOX AND LEVEL SPREADER CONSTRUCTION NOTES R. NiNES~ CLASS B RIP RAP \ ~ 285.5 ~ \ ~ _ ~ 1. GRADE THE FILTER STRIP TO THE DESIGN SLOPE TAKING CARE NOT TC D5p- $ \ \ \ ~ ANY COMPACTED SOIL, ADD ANY AMENDMENTS, AND SOD THE FILTER CARE NOT TO COMPACT THE SOIL. LOOSEN 1. THE SPUTTER BOX AND. LEVEL SPREADER SYSTEMS SHALL NOT 8E INSTALLED UNTIL /t{j~¢~ ID THE FILTER STRIP. ALL CONTRIBUTING DRAINAGE AREAS HAVE BEEN STABILIZED. ff J \ \ 64 LF-18" RC \ 2. CONSTRUCT THE BLIND SWALE AND UNDERDRAIN PIPE IF IT IS REQUIF \ \ ~ IF IT IS REQUIRED FOR DRAINAGE) AND THE 2. THE RECEIVING AREA BELOW THE LEVEL SPREADER SHALL BE PROTECTED FROM HARM G~~~~~ PLUS FES ~ N R T VEL PRA R. AR HA TAK N TO INSURE THAT I CO C E E LE S E DE C E S LL BE E INSURE THAT THE TOP OF THE SPREADER AND SEDIMENTATION DURING CONSTRUCTION. IT SHALL BE STABLE PRIOR TO CONSTRUCTION THE LEVEL SPREADER TO PREVENT "SHORT OF THE SPREADER AND SHALL HAVE TOPOGRAPHY SUITABLE TO PREVENT UNDUE FLOW AT 0.7~ SL E\ \ IS LEVEL. SHAPE THE BLIND SWALE AND AREA AROUND THE LEVEL SF ~ \ ~ CIRCUITING" AND THEN SOD THE BLIND SWALE AND THE DISTURBED AF DISTURBED AREAS. CONCENTRATION PRIOR TO ENTERING A STABLE WATERCOURSE. REVISIONS \ ~ ~ ~ ~ \ \ 3. CONSTRUCT THE BYPASS CHANNEL AND STABILIZE IT ACCORDING TO 1 ;CORDING TO THE PLANS. 3. LEVEL SPREADERS SHALL BLEND SMOOTHLY INTO THE DOWNSTREAM RECEIVING AREA WITHOUT ANY DROPS OR IRREGULARITIES TO AVOID CHANNELIZATION OR TURBULENCE. THEY SHALL BE 4. CONSTRUCT THE SPUTTER 80X AND ASSOCIATED STORM DRAIN. FLON 1 I DRAIN. FLOW SHOULD NOT BE DIRECTED CONSTRUCTED ON UNDISTURBED SOIL WHERE POSSIBLE, IF THE USE OF FILL CAN NOT BE TO THE LEVEL SPREADER OR THE FILTER STRIP UNTIL BOTH ARE STAI \ 30TH ARE STABKIZED. AVOIDED, THE SPREADER SHALL BE CONSTRUCTED ON MATERIAL COMPACTED TO 95% PROCTOR. OUTLET ~ ~ ~ / ~ ~ \ 4. THE CONTRACTOR SHALL. MAKE INSPECTIONS AFTER EVERY RAINFALL, OR AT LEAST STRUCT RE I ~ ~ \ ~ \ ~ WEEKLY, AND SHALL MAINTAIN AND REPAIR THE AREAS AROUND THE 80X AND SPREADER ~ ~ ~ \ sq \ AS REQUIRED. THE CONTRACTOR SHALL LOOK FOR AND ADDRESS ANY DEBRIS, SEDIMENTATION, 0 1 ~ I ~ ~ 9 } \ RILLS, OR WASHING DURING HIS INSPECTIONS. THE ENGINEER SHALL BE NOTIFIED OF ANY SUBSTANTIAL PROBLEMS. ~ ~ / GENERAL ENGINEERED FILTER STRIP CONSTRUCTION NOTES 1. THE ENGINEERED FILTER STRIP AREA SHALL BE NO LESS THAN 30 FEET IN WIDTH AND PLACED AS SHOWN. THE CONTRACTOR SHALL TAKE CARE TO GRADE THE EFS AREA WITH A UNIFORM ~ SLOPE OF FIVE PERCENT. IF FIELD CONDITIONS DICTATE, THE SLOPE MAY CHANGE WITH APPROVAL w J9 9 FROM THE ENGINEER, BUT IT MAY NOT EXCEED EIGHT PERCENT. ~ 0 2. THE SOIL IN THE EFS SFIALL BE PROPERLY PREPARED TO ESTABLISH AND MAINTAIN A DENSE ~ STAND OF BERMUDA GR,SS SOD. CARE SHALL BE TAKEN TO NOT COMPACT THE SOIL AREA AND THE SOIL SHALL BE AMENDED AS NECESSARY TO ESTABLISH AND MAINTAIN 7HE SOD. W 3. THE CONTRACTOR SHALL TAKE CARE TO WATER THE SOD AS NECESSARY, ESPECIALLY AFTER o CONSTRUCTION. ANY RILLS, BARE SPOTS, OR EROSION SHALL BE REPAIRED IMMEDIATELY TO MAINTAIN SHEET FLOW ACROSS THE EFS. CONSTRUCTION DOCUMENT Y STREAM X X RCP OUTLET PIPE TO O NEUSE BUFFER, / RCP ZONE 1 \ ~ \ - SPLI' RCP INLET PIPE IN70 BIPASS CHANNEL ~ SPLIirER BOX DIAMETER: D ("`///^JJJ RCP INLET PIPE RCP OUTLET TO 81PASS CHANNEL DIAM DIAMETER: A DIAMETER: A DIAMETER: D UNDERDRAIN TO BYPASS CHANNEL DRAIN INTO BYPASS ~ ~ NEUSE BUFFER \ ^ RCP OUTLET TO LEVEL SPREADER _ CCC~ ~ ~ DIAMETER: B SAE ~ \ / - WITH ORIFICE PLATE ~ ~ N. ~ ~ DIAMETER: C B1PA55 CHANNEL ~ O RCP OURE7 PIPE TO LEVEL SPREADER SEE CHANNEL INFORMATION ON PLANS \ VEGETATED FILTER STRIP ~ RCP OURE7 PIPE DIAMETER: 8 J WITH ORIFICE PLATE CONCRETE LEVEL SPREADER ~ (IF REDUIRED)W y WITH COPING REMOVED ~THEORFICE PL7 TIED INTO SLOPE TO PREVENT y ~ y y 8 0~6 FRAME 840.54 MANHOLE DIAMETER: C DIAMETER: C ( \ SHORT-CIRCUITING ~ J AND GRATE ~ 2'-6" FRAME AND COVER J ~ ~ ~ ~ TOP ELEV.• G CONC SLAB: W ':e ~^.;/~,;'e:~.+S:',p,~: CONC SLAB: X iQ,Y, OtJ.q• ~a FlLTER FABRIC ~ J WITH 3" x/57 STONE RIP-RAP LINED FOREBAY ~ 8 8" \ CONCRETE LEVEL SPREADER (SEE CHART FOR 8" 8" PERPENDICULAR TO SLOPE REQUIRED DIMENSIONS) CONCRETE LEVEL SPREADER (v\ I ' (SEE CHART FOR REQUIRED TOP OF WEIR O LENGTH) (CAN SUBSTITUTE FOREBAY WITH OVERFLOW RCP INLET PIPf A DISSIPATOR PAD IF SPREADER WEIR DIAMETER: A WEIR ELEV.• F IS RECEIVING FLOW FROM A BMP.) BOTTOM PLAN VIEW ~ \ CONC BASE BOTTOM RCP OURET TO BIPASS CHANNEL Nrs ~ v 4, DIAMETER: D PLAN RCP OUTLET TO LEVEL SPREADER 3 00 ~ VIEW ~ WTH ORFlCE PLATE BOTTOM SECTION-YY DIAMETER: C ELEV.• H 8'~.--~I ~ SPUTTER BOX AND LEVEL SPREADER SCHEMATIC ~ 11/2" SECTON-XX io NOT TO SCALE o GENERAL NOTES 1 1/2" 3' FlLTER FABRIC WITH 3" X57 STONE i. ALL DROP INLETS OVER 3'-6" IN DEPTH 70 BE J{8 BARS d. U PROVIDED WITH STEPS 1'-2" ON CENTERS. STEPS = LEVEL SPREADER TIED 6" SHALL BE IN ACCORDANCE WITH NCDOT STD 840.66. Z Z ~ Z INTO SLOPE TO PREVENT CONCRETE LEVEL SPREADER SHORT-CIRCUITING. 2. CLASS "B" CONCRETE TO BE USED. , (SEE CHART FOR REQUIRED HEIGHT SHALL BE 6" I `0 O SPUTTER BOX AND LEVEL SPREADER SCHEDULE LENGTH) ABOVE NATURAL GROUND. 6" 3. ALL MORTAR JOINTS ARE 1/2" t i/8" ~ 8„ 4" . 4. FORMS ARE TO BE USED FOR THE CONSiRUCi10N ° OF THE BOTTOM SLAB. BOX ~i SEC)lON-ZZ A (L u 5. BRICK MASONRY DROP INLET NOT TO BE USED A (LENGTH &DIA INTO BOX) 8 LF - 24" RCP C UNDERDRAIN ~ 24" IN LOCATIONS SUBJECT TO TRAFFIC. OHOe ~ PLAN OF CONCRETE SLAB 'X' (~~J - 1' Nr B Rq 6. JUMBO BRICK WILL BE PERMITTED. CONCRETE BRICK ~0 INSTALL 3' WDE STRIP OF FILTER OR SOLID CONCRETE BLOCK MAY BE USED IN LIEU OF B (LENGTH &DIA TO LS) 8 LF - 24" RCP ~ ~ \O 2' AVG DEPTH (Ow FABRIC WITH 3" LAYER Of #57 CLAY BRICK. 1 1/2" J C (ORIFICE DIA) (IN) 19.5 RIP-RAP LINED STONE TO REDUCE EROSION. 1 1/2" FOREBAY (SEE 0/ 7. IF REINFORCED CONCRETE PIPE IS SET IN BASE ~ 5 ~5 BARS CHART FOR REQUIRED FFUSP 4 ~ 8" SLAB OF BOX, ADD TO AS SHOWN ON NCDOT STD. E0. SPACED. D (LEA FOREBAY DIMENSIONS) F(Ow a ' . e. 840A0• N D (LENGTH &DIA TO BYPASS) 8 LF - 15" RCP REVIEWED BY: LRH {CAN SUBSTITUTE FOREBAY WITH OIFF,(/ ~ Z Z ~ S 8. FOR 8'-0"IN HEIGHT OR LESS USE 8" WALL, OVER E DESIGNED BY: LRH E (BOTTOM OF 80X) (FT) 285.00 DRAWN BY: LRH A DISSIPATOR PAD IF SPREADER F F(0 8'-0"IN HEIGHT USE 12" WALL TO 6'-0" FROM TOP OF IS RECEIVING FLOW FROM A BMP.) W ~16^-•{ WALL, AND 8" WALL FOR THE REMAINING 6'-0". I `O F (TOP OF WEIR) (FT) 286.63 QUALII)ES TO BE ADJUSTED ACCORDINGLY. ~ 24" DATE: OCT 2010 G (70P OF BOX) (FT) 288.50 PROJECT NUMBER: 10 03 ISOMETRIC 9. CONTRACTOR MAY USE ALTERNATIVE BOX SYSTEM WITH & J/5 BARS 1HE APPROVAL OF THE OWNER AND ENGINEER. CONTRACTOR EQ. SPACED. I VIEW NOTE; CROSS-SECTION MUST SUPPLY SHOP DRAWINGS TO OWNER AND ENGINEER SECTION-ZZ H (INV TO BYPASS) (FT) 285.oD LEVEL SPREADER PLAN nnin nrrnu c CONTRACTOR TO PROVIDE ENGINEER AN AS BUILT VIEW rltrurct ArrnvvAL to UMAIVttU. YiiVV VG It11W SURVEY OF ALL APPURTENANCES OF THE LEVEL PLAN OF CONCRETE SLAB 'W SPREADERS, SPLITTER BOXES, CHANNELS, ETC. LEVEL SPREADER SCHEDULE AS DIRECTED BY THE ENGINEER. FOREBA LSD/ (CFS) LENGOTHR(FDT) DIMEN SIONSY(FT) 1 10.00 100 N/A LS - 1 SPLITTER BOX DETAILS CONCRETE LEVEL SPREADER DETAILS NOT TO SCALE NOT TO SCALE OCT 2011 i ~ ~ ENGINEERED FILTER STRIP 0 MAINTENANCE \ U EASEMENT N a \ S! TE DATA ~ STORM WA TER MANANGEN 'ANANGEMENT > ' ~ N O Q' ~ IMPERVIOUS AREA ANALYSIS: U~ SIS: ~ ~ Z N ~ PIN: 162700-64-0047; DB 2602, PG 0506 - - _ \ 1 BYPASS FLOW CHANNEL PIN: 162700 53 7696; DB 2865, PG 0452 TOTAL TRACT AREA - 16.71 ACRES (72! i.71 ACRES 728,029 SF Q N ( ) S PIN: 162700-64-7387; DB 3151, PG 0196 ASSUME A MAXIMUM ALLOWABLE IMPERVI - 1 OWABLE IMPERVIOUS AREA OF 60% = 436,817 SF ~ ~ ~ ~ PROPOSED ROADWAY IMPERVIOUS AREA ERVIOUS AREA = 37,487 ~ j ~ MAX ALLOWABLE SITE IMPERV -PROP R ACREAGE: 16.71 ACRES 'ERV -PROP ROADWAY IMPERV =ALLOWABLE IMPERV AREA IN LOTS = 399,330 SF ~ ~ ~ AREA IN LOTS / # OF LOTS = MAX ALLOWABLE IMPERVIOUS AREA PER LOT ~ (~j CONCRETE LEVEL ALLOWABLE IMPERVIOUS AREA IN LOTS / ZONING: GB LOTS = 10 Uj2~ SPREADER # MAXIMUM AVERAGE IMPERVIOUS AREA PE VIOUS AREA PER LOT = 39,933 SF) ~ O ~ ~ ~ TOTAL LOTS: 10 ~ NITROGEN EXPORT ANALYSIS: ~~D,L 'SIS: ~.I AVG LOT SIZE. 1.15 ACRES T Ara o assn to e 0 60~ IMPERVIOUSNESS (10.03 ACRES) RE, ~ MIN LOT SIZE: 0.66 ACRES ).03 ACRES) RESULTS IN A TOTAL NITROGEN (TN) EXPORT OF 12.06 LBS/AC/YR, WHICH IS GREATER THAN THE 10,0 LBS/ 1 .4 A r e s ~ EXPORT FOR THE SITE BY 25% TO A VAI THE 10,0 LBS/AC/YR LIMIT. THE WET RETENTION POND REDUCES THE TOTAL 25% TO A VALUE OF 9.05. AN OFFSET PAYMENT WILL BE REQUIRED TO a PUBLIC STREET LENGTH. 1,067 LF REDUCE THE TOTAL NITROGEN EXPORT V DGEN EXPORT VALUE TO 6.0 LBS/AC/YEAR, SPUTTER. BOX 1 \ _ \ ANALYSIS SUMMARY: ~ TO MEET BOTH IMPERVIOUS AREA AND N ~ ~ ~ ~ \ ~ \ THE IMPERVIOUS AREA PER LOT TO AN JS AREA AND NITROGEN EXPORT REQUIREMENTS, THE DEVELOPER AGREES TO LIMIT ER LOT TO AN AVERAGE OF 39,933 SF. ~ . ~ III I i i ~ ~ SEALS I ~ ~ ~ ~ \ . I \ i`ldilldtlddtf \ ~ecees(~s/°°° ~ ~i~ ~ ' ~ ~eeee ot'GSl7/O e0°R~~ r! ® nC` ~ e ii ~ ~ ~ aq ° e ®g I ~2~~,, ~ (f ~ ~ a ~ \ v. y ` ; ~ ~ ~ TOP OF is ~ eeeoeM° J~~~ R, HfN~s',~x`' /tttttdN dl ' I 1~ \ I / \ ~ / / ~ , . ~ ~ ZONE 1 N \ i i ~ ~ I i ~ ~ i FES 2 ~I \ \ ~,V'lNrV9 1 ~ r \ ~ ` ~ REVISIONS \ ~ \ % ~ \ r ~ \ / ` ~ ~ y ~ y r \ \ 50 NEUSE y ~ ~ y RIPARIAN BUFF(~R ~ ~ y \ ` \ \ \ y y y \ ~ / `i' `L 1 \ y ~ y ~ y I ~ DI 3 DI 8 y W y W I \ w ,P,. ` ~ ,W \ 1 1 8 Q DI 7 9 W I F I \ Z w 7 ~ ~ I \ ~ ~o. ~ i ~ a \ O \ U DRAINAGE BASIN BOUNDARY (TYP.) ~ ~ \ \ \\l 0 9~ti N '9C \ \ ~ 10 F \ ~ Q \y O F 9s ~'>7 ~ y CONSTRUCTION DOCUMENT I FN T T / I \ y y 0~ t ~ F ~~a ~ ~,4 p~ G CB 6 CB 4 CB 2 \ 5~ Q~ ! ~VOG~~ \ \ ~ ~ ~a+oo s+oo a+oo ~+oa s+oo s+oo ~ GP GP ~ \ i ~ y ~ ~ rO~ CB 7 CB 5 CB 3 CB 1 4+00 ~ \ J~ \ F \ i ~ ~ y ~ ~ _ FES 3 aX oa ~ ~ ~ O ~ ~ m o W ~ \ ~ ~ I I ( I f ~ ~ ~ ~ Q ak y ~ ~ 3 °o 4 DI 5 ~ ~ \ 6 5 I I ~ 0 I 2 lye ~ WQ Z 0 ~ ~ ~ ~ ~ w ~ o i W ~ ~ ~ o Q DI 4 O \ ~ ~ j w i i ~I I I o: W I ~ N O o Q i ~ ~N U I ~ I z I a ~ ~ ~ DI 1 I I1 I I DI 2 I O t ~ ~ ~C ~ I I ~ / ~ EX INV 313.40 \ ~ ~ ~ Z EX INV 310.75 FES 1 ~ / \ - - - - - - U NC HIGHWAY 42 0 + ~ Z S ~ 0 o " 100 PUBLIC RIGHT OF WAY ~ NII X REVIEWED BY: lRH x ._---------w~---------- - - W / DESIGNED BY: LRH / DRAWN BY: LRH / DATE: OCT 2011 / - - - - PROJECT NUMBER: 10 03 OVERALL BASIN MAP Thy nff cifA ~licnhrlr~r~ from +hic r,ir>r~ is DRAINAGE BASIN BOUNDARY (TYP.) Not to Scale route through e site to the existing stre m via th existing channel. LS-2 OCT 2011