20090040 Ver 1_More Info Received_20090429

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1 11010 Raven Ridge Road Raleigh, North Carolina 27614 . Phone: [phone] rp,?,Fpx: (91,846-940r'-
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www.SandEC.com
April 29, 2N*?s
S&EC Project # 10708.P Ilk,
DWQ Project #09-0040 CCU
Department of Environment and Natural Resources
Division of Water Quality
Attn: Annette Lucas
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604
Re: Reply to the Division of Water Quality's 04/08/09 Request for More Information
Beacon Lake Industrial Commons
Raleigh, Wake County, NC
Dear Ms. Lucas:
This letter is in response to your letter dated April 8, 2009 which requested additional information for the proposed
Beacon Lake Industrial Commons development. The following restates your questions/comments and is then
followed by our response.
1. Please make the following two corrections to the "BMP Planting/Sodding Notes" on Sheet C4.2:
a. ` The vegetation in the bioretention cell may not be fertilized on a regular basis. Only a one-time
application of fertilizer to establish the sod is allowed.
b.. The application of herbicide in a bioretention cell should be avoided.
Please see the revised Plan Sheet C4.2.
2. Please conduct afield test to determine the SHWT in the vicinity of the proposed bioretention cell. If the
SHWT is greater than two feet beneath the invert of the bioretention cell, then show-the correct elevation in
the "Bioretention Filter Media Cross-Section " on Sheet 4.2. If the SHWT is less than two feet beneath the
invert of the bioretention cell, then you must either redesign the cell to provide greater separation or select
a more appropriate BMP for the site.
Please see the revised Plan Sheet C4.2.
Please feel free to call me if you require any further explanation.
Sincerely,
-9
Nicole J. Thomson
Regulatory Specialist
Attachments: 2 copies of DWQ Request for more information letter (2/12/09)
2 copies of Response letter
2 copies of Revised Plan Sheet C4.2
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C. 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
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~ / 4"0 PVC CLEANOUT 18"THICK LAYER CIASS'B' RIPRAP
\ / - _ 1 FILTER FABRIC MIRAFI FW500 OR
/ ~ •r 1! l i 'I / 1 APPROVED'EQUAL 3' 2' 3'
~ i ~ ~ 4'0 SCHEDULE 40 ~ PVC RISER PIPE 4"SCHEDULE 40
14' X 8' X 18" DEEP ~ / (NON•PERFORATED) - ' I LA - A ~ PERFORATED PVC LEADER UNDERDRAIN
~ - @ OAO°4 SLOPE 8"SCHEDULE 40 PVC MAIN UNDERDRAIN EL, =197.74
~ I. - 1 DEEP BMP R AY ~ ~ _ @ 0.00% SLOPE 2
(2:1 MAX S[D-SLOP.E ~ _ ~ % _ CB 20 ~
- ~ ~ r - o J' q" 8"DEPTH `r ~'~tf_::.r EL.=196,24 1157 STONE BED - _
,i' / ~r ( a / 1, r~~••~~~ rP.Y,. i~'r rMy` ~ rt5;'1 ~ r(~, y,, ~ r
/ ~ / ~ ~ I ~ ~ ~ 4"t3SCHEDULE40PVC PROP 20' PRIVATE ~ ( ~ ~ , 90°BENDCONNECTION IN-SITU ~..ll.:.`, n'~'~''`'
ORAINAG/F-EASM T ~ ~ \ %i / 0 0 / / ~a, ~ ~/y / 00000 SOIL , • ~ 00000000000000 ~ ~y ~~~~„7,.,• ~ • n 0 0 0 0 0 0 0 FILTER FABRIC ~ N
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$cALE: NTS BID-RETENTION FOREBAY/ APPROVIcDEQUAL Z
L / ~ ~ ~ / / p ~ e %i , j~.~ UNDER[ z 4"~PERFORArEOPVC VELOCITY DISSIPATOR
/ VC \ ~ / 1 / i MIN, SC DIVERSION WALE / / CO @ C,p ~r ,y UNDERDRAIN HEADER MIN, SCHEDULE 40 PVC @ 0.00°k SCALE: NTS ~ ~ ~
/ J I IETO (TIE TO 8"MAIN LINE) ~ N Q V
RISEWC~.EANOIJT ~ ~
/ / co @ ~ ~ s ~ / ~ ~ PVC RISEWCLEAn o \ - . / oo ' ~ - _ li ~ . NDERDRAIN DE 0 ~RDRAIN DETAIL W
/ x IN UT = 198,24 , /;1... ~ U ~ / / SED BIOR ION CELL I , ' .~.II':~;' :J• ~ , SCALE: NTS SCALE: NTS UTILITY INSTALLATIONS AND OTHER PUBLIC FACILITIES, ZW a? y
CO / ° ~ ~ ~ DIRECTION OF FLOW / SUR ELEVATION 196.24 ~ _ , / - ~ Low INCLUDING SIDEWALKS AND HANDICAP RAMPS ARE TO ~ W = W o BE CONSTRUCTED ON ALL STREETS AS SPECIFIED BY
_ ~ - CITY CODE. THESE FACILITIES HAVE BEEN APPROVED ~ ~ a
4"SCHEDULE 40 PVC 4^ SCHEDULE 40 PVC BY THE CITY OF RALEIGH AND SHALL BE SO ~W z W Q
- - - I O, ~y , ~ , ~ / S RCP i O(~Q I o LEA[ ° LEADER UNDERDRAIN uNOERDRAIN HEADER INSTALLED UNLESS A CHANGE IS AUTHORIZED BY i ~ = a 3 o @0.00%SLOPE @0.00°/pSLOPE WRITTEN APPROVAL, PUBLIC SANITARY SEWER ~
\ p(i ® / / ~ t7' I o ° EASEMENTS ARE TO 8E RECORDED PRIOR TO FINAL ~ ~ ~ °f M
, ° ACCEPTANCE, p~ ~ N ° o 0 0 0 0 0 0 0 0 o d 0
o ~ y '4p ~ r - - - - ~ FES Z1 r / o 1 x / , ~ INV OUT = . h ~ ~ ~ `C ' / / / , • e ~ X19 .00 SIGNATURE: o W ~ ~ ~Nm~?
~ ~ / DIRECTION OF FLOW -ia- N ~ ~ P DIRECTION OF FLOW ~ ~ W ~ 0~0 ~
u , - / 199.24 ' [NV OUT = a \ vl ~ / 3l4" PERFORATIONS AT 4" O.C. NOTE: WRAP ALL SECTIONS OF PVC TRANSPORTATION SERVICES: ~ ui ~ MIN. (9) PERFORATIONS PER LF UNDERDRAIN TWICE WITH MIRAFI FW 500 ~ Z G =
•r y ~ / I~ / ~ i w / ' ~ CO / / ~ 191.00 a ' ' / - - ~ 198.24 \ OF PIPE (OR APPROVED EQUAL) AND SECURE WITH ~ ~ STAPLES PUBLIC UTILITIES: ~ a o N ~
' ~ _ , i % / ~ / 0 ~ 8"x8°x4" PVC s^ scHEOULEaD PYC CONSERVATION ENGINEER; X ~ ~ ° ~ ~
c s OVERFLOW STRUCTURE / / REDUCING TEE JOINT g"31 / / MAID HW 10 , YERFLOW GRATE ELEV = 19 24 h MAIN UNDERDRAIN ~ ~ N "
rw- / / ' ~ [NV [N (S" PVC) = 194.4y / / a 0 @ O.i a ~i / INV our 115" RCPT = f4R.4t / - a a UNDERDRAIN JDIN' @ 0.00°k SLOPE z J f" ~ ~ )RAIN JOINT PLANNING: ~ = W
a ~ < , / r / _ / / _ _ _ ~ , / , : ~QNNECTION DETA ~ / PVC PERFORATION ~ r, ~
C1 / ~ r~ ~ / / \ NTS SGb-EDUCE DETAIL ~ d ~ W ~ SCALE: NTS z ~ 0 r
~ / 0 / BMP EA MENT f _ _ - ~ r.
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/ / ~ ~ / ~ r'r!/// % ~ ? 10' W[OE MINIMUM MAINTENANCE AC j~ _ _ ~ : / ~ % / ~ ~ . f5:1 MAX LONGITUDINAL 10.1 MAX MAINTENANCE ACCESS PATH OVERFLOW STRUCTURE (SEE DETAIL) 10' WIDE MINIMUM MAINTENANCE ACCESS PATH lil v ~ M F" LL 13NA1 1011 MAX CROSS-SLOPEI [5.1 MAX LONGITUDINAL 10:1 MAX CROSS-SLOPE D
/ / i FILTER MEDIA LAYERS m
(SEE DETAIL) 3
3 OVERFLOW GRATE ELEV.= 199.24 ~ ~ y ~
-1~ ELEV= 198.24 BMP FOREBAY (SEE DETAIL! Z ~ H
/ ~ IN-SITU (TOP OF FILTER MEOfA) [NV IN. 8"PVC W W Z TU (FROM CB201=198.24 ~ ~ ~
/ , ~ ~ - ~ ~ SOIL 1 IN•SITU V ~ C
\ / / SOIL
V
0 N
c° a ~ P ' / ~S e \
~ ~ l R t FOREBAY INVERT = 196.24 ~ ~ J Z I STONE BED INVERT ELEY= 194,41 C C~ O y (BOTTOM OF FILTER MEDIA) ~ d
m p~ / , i/ 1 ,c /q~bFR 1 ~~0 OC
~ ~ / IN-. IN-SITU ~ IN-SITU ~ ~ V
SOI o SOIL PVC UNDERORAIN (SEE DETAIU SOIL ~ ~ ~ ~ oW. d ; v p
E ~ , ~ / o IMPORTANT INSPECTION AND MAINTENANCE PROCEDURES: 2.5'X2.5' OVERFLOW GRATE TDP of Cues NOTES: ~ ~ o:
WILL BE WATERED ONCE DAILY IF BID-RETENTION CONSTRUCTION SEQUENCE: UNDERDRAIN SYSTEM SUMMARY - IMMEDIATELY AFTERTHE BIORETENTION CELL IS ESTABLISHED, THE SOD DWQ BMP DESIGN SUMMARY
o NEEDED UNTIL THE PLANTS BECOME ESTABLISHED (COMMONLY 8.10 DAYS). 1. ENSURE UPSTREAM CONTRIBUTING DRAINAGE BASIN 1S FULLY STABILIZED PRIOR 1.401NIHR. ~ i)THE CAOCHEBASIN ON THE UPHILL N
c - ULCH OR ANY OTHER MATERIAL WILL NEVER BE PILED ON THE SURFACE OF THE BIOR TO COMMENCEMENT OF 810•RETENTION AREA CONSTRUCTION. TOTAL AREA TO BIO•RETENTION CELL: 1.964 ACRES PERMEABLE FLOW RATE, Qk: 1.40 INIHR. SNOW, M 2. REMOVE TEMPORARY DETENTION BASIN ON LOT ~3 PRIOR TO START OF IMPERVIOUS AREA TO BIO•REFENTION CELL: 1.51 ACRES (Qk k (inlirx)' ponding depth f media deptl~) ELEV OVERFLOW GRATE = 199.24 FOR SLOPE SIDE SHALL BEGIN TO' FROM THE el' M r . „ _ 124 " THE CATCH BASIN. THE SLOPE OF ' ~ ' REQ.'S SEE
$ -HEAVY EQUIPMENT WILL NEVER BE DRIVEN OVER THE BIORETENTION CELL, CONSTFiUCTK1N. RATIONAL C•VALUE: 0.81 0.35 OPEN 0.951MP. PERMEABLE FLOW, Qp: 0,162 CFS 0,162CFS I6' T ~ NOTE I. THE CUTTER TO THE CATCH BASIN , ON THE DOWNHILL 9DE, n! N Q
0 ' - SPECIAL CARE WILL BE TAKEN TO PREVENT SEDIMENT FROM ENTERING THE BIORETENTION CELL. 3. GRADE AND STABILIZE DNERSION DITCHES AROUND BIO•RETENTION CELL TO ( i (Qp = Qk' SA ° 1FT1121N'1HRl3800S) 0 DVERT UPSTREAM FLOW DURING CONSTRUCTKXJ. ELEY 810-RETENTION ELEV 810-RETENTION srlau BEGIN 5' FROM Z
o - ONCE A YEAR, A SOIL TEST OF THE SOIL MEDIA WILL BE CONDUCTED. 4. EXCAVATE BIO•RETENTION FOOTPRINTAREA TO DEPTH SPECIFIED ON PLANS RUNOFF COEFFICIENT, Rv: 0.766 SURFACE= 198.24 SURFACE= 198.24 f~ A THE CATCH BASIN. 5 w/ /v FLOW UNE y) STEPS SHALL BE INSTALLED IN
5. INSTALL 4'X4' OVERFLOW STRUCTURE AND 15' RCP OUTLET PIPE AS SHOWN ON RUNOFF DEPTH, Rd: 1.0" SAFETY FACTOR: 5 v AFTER THE BkNtETENTION CELL IS ESTABLISHED, FINANCIALLY RESPONSIBLE PARTY WN.L INSPECT Ti ONCE A MONTH AND WATERSHED AREA, A: 1.964 ACRES DESIGN FLOW, Qd: 0.61 CFS m WITHIN 24 HOURS AFTER EVERY STORM EVENT GREATER THAN 1.0INCHES (OR 1.5 INCHES IF IN A COASTAL COUNTY). PLANS. 0.61 CFS ALL CATCH BASINS OVER 3' IN DEP1H. fA m z-z" ca. APE aR Pvc PIPE DEPTH SHALL BE MEASURED FROM THE = 7 Z
o RECORDS OF INSPECTION AND MAINTENANCE WILL BE KEPT IN A KNOWN SET LOCATION AND WILL BE AVAILABLE UPON 6. PLACE FIRST COURSE OF 18° THICK 857 STONE AND LAY 8' PVC MAIN LINE AND 4° WATER QUALTTY VOLUME, WQv: 5,277 CUBIC FEET UNDERDRAIN CAPACITY e" MIN„OVER t2'IDEEP 12" MIN, TOP OF THE GUTTER TO THE INVERT III?~~~~ D 94LF 15"RCP ' , ~ To s' FROM TOP OF CUB. Z o
~ REQUEST. INSPECTION ACTNITB:S SHALL BE PERFORMED AS FOLLOWS. ANY PROBLEMS THAT ARE FOUND SHALL BE PERFORATED LEADER LINES FOR UNDERDRAIN SYSTEM PER PLAN. INSTALL AND (NxD =16'((Qd' n 1 slope^0,5)^318}) N x D = 6.46 REPAIRED IMMEDIATELY. SEAL ALL CONNECTIONS OF PVC PIPES. ENSURE MAIN LBJE AND LEADER DRAINS (WQv=3630'Rd'Rv'A) NxD-6.46 8" PVC @ O.OO% @ 3.63x ~ 3) SOLOECONCRETEABRICKS MAY BE ~
m INSTALLED BETWEEN 0,50-0.60% SLOPE. CONNECT 8' MAIN LINE DOWNSTREAM 5 (FROM UNDERDRAINI 5'', ~ I" USED IN 4X4X8 OR 4XSX16 SIZES. 0 a
AREA: END TO 4704' OVERFLOW STRUCTURE PER DETAILS. GROUT CONNECTION TO BMP SIZING 8 DIMENSIONS NUMBER LEADER DRAINS (4"): 5 INSPECTION AND MAINTENANCE PROVISIONS FOR BIORETENTION ~ STRUCTURE. TOTAL LF PERFORATED 4" PVC: 278 LF c TOTAL LF NON•PERFORATED 4" PVC: 25 LF 278 LF 4) NCDOi APPROVED PRECAST 25 Lf ~ CONCRETE BOXES ACCEPTABLE ~ e.
0 ~ BMP ELEMENT: POTENTIAL PROBLEMS: HOW TO REMEDIATE THE PROBI.EM• 7. FILL 857 STONE T016" DEPTH AND ENSURE A MINIMUM 2° OF 5TONE TO SEPERATE DESIGN PONDING DEPTH, D: 12' Iz' ~ IS' USING STANDARD 5' CASTINGS. Z Q w
G m CROWN OF LEADER PIPES AND TOP OF ST~IE. NUMBER MAIN LINE DRAINS (8°): 1(0=8, N=1, t THE ENTIRE BMP TRASHlDEBRIS IS PRESENT. REMOVE THE TRASHIDEBRIS. 8, INSTALL GEOTEXTILE FILTER FABRIC LAYER ON TOP ~ 857 STONE LAYER. PONDING VOLL9ulE REQUIRED, Vr. 5,277 CUFT. 1 (0=8, N=1, NXD>6.46) 5) DOMESTIC CASTING REQUIRED NITHIN CA O W 61 LF , 1• ~ STREET RIGHT OF WAY. N F ~ 0
r m UM ~ 1' AND KEY IN A FABRIC A MINIMUM OF PONDING VOLUME PROVIDED, Vp: 5,411 CUFT. 70TAL LF NON•PERFORATED 8" PVC: 61 LF a ~ OVERLAP ROLL WIDTHS AT A MINIM
~ ° THE PERIMETER OF AREAS OF BARE SOIL ANDIOR REGRADE THE SOIL IF NECESSARY TO 1.5' INTO SOIL AROUND PERIMETER OF FILTER AREA, - NUMBER CLEANOUTS (REQ'D 1 PER 1000SF): 6 (5 REQ'D ~ * THE BIORETENTION CELL EROSIVE GULLIES HAVE FORMED. REMOVE THE GULLY, AND THEN P1ANT A 9, INSTALL 4' THICK LAYER OF WASHED SAND OVERTOP FILTER FABRIC. ENSURE BIO•RETENTION PONDING INVERT ELEV: 198.24 FT (SA 198,24_ 4,992 SF) 6 (5 REQ'D @ 4,992 SF) ELEV 8" PVC " ~ ELEV 15" RCP ~ , ° ' ° ~ Q z INV [N = 194.41 1NV OUT = 194.41 ° ° p p ° ~ ~ ~ 0 N y ~.r' 30D0 - p o °p.°°a ~ ° ° ° p
vi 0 GROUND COVER AND WATER UNTIL IT IS CONSTRUCTK)N EQUIPMENT DOES NOT TRAVEL OVER PVC PIPE TO PREVENT 810•RETENTION PONDING MAX ELEV: 199.24 FT (SA 199.24 - 5,842 SF) p ° o o ° 4 II
o c ONE•TIMEFERTO.IZERAPPL.ICATION. BREAKAGE. m 10. CALCULATE TOTAL VOLUME OF FILL MATERIAL REQUIRED FOR BIORETENTKNJ B10•RETENTtON CELL AVG. LENGTH: 85 L BID-RETENTI®N OVERFLOW CONC. ° ~Z D , o ° Q, o ° p " ° ,~Z 0 Q m
0 CELL AND M0(MEDIATO THE %WEIGHi COMPOSITION AS DETAILED IN THE BIO•RETENTiON CELL AVG. WIDTH 68' m THE INLET DEVICE: PIPE, THE PIPE IS CLOGGED UNCLOG THE PIPE. DISPOSE OF THE STRUCTURE ELEVATION DETAIL • ° ° • ° ° • ° • ° • ° " ° • ° ° . ° 6" ~P To 12' DEEP $ o pp M o° ° o • ° ° , p p • p p p . p o p p . p p o . 6' T 2° OVER 12' DEEP t0 Z ~ 1~1.
w c STONE VERGE OR SWALE (IF APPLICABLE). SEDIMENT OFF-SITE. DESIGN SUMMARY NOTES ON THIS PLAN. INSTALL MEDIA MATERIAL TO A DEPTH SCALE: NTS ~ 6' 6'4° ~ ~ ~ 0 ~ LL
a 0 E THE PIPE. OF 2.5 WHILE ENSURING THAT CONSTRUCTION EQUIPMENT DOES NOT PASSOVER MEDIA AND SOILS SUMMARY ~ a THE PIPE IS CRACKED OR REPLAC MATERIAL ALREADY INSTALLED. ACCIDENTAL COMPACTION OF MEDIA MATERIAL d to
a ODAMA ED F APPLICABLE . WILL RESULT IN FAILURE OF STRUCTURE TO PERFORM ADEQUATELY UPON INITIAL SOD LAYER TOPSOk DEPTH, FT. 0,33 FT. (TOP ELEV=198,24) o m ( ) INSPECTION, IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO REMOVE AND pUWTING MEDIA DEPTH, FT: 2.50 Fi.
t ~ EROSION IS OCCURRING 9J THE SWALE REGRAOE THE SWALE 1F NECESSARY TO REPLACE ANY MEDU? MATERIAL OVERCOMPACTED BY CONSTRUCTION PLANTING MEDIA SOIL COMPOSITION STANDARD C.B. STEP W
~ ui (IF APPLICABLE). SM00~ L DEVK;ES SUCH AS REINFORC D EQUIPMENT. % SAND (BY WEIGHT): 85% m c CON 0 11. INSTALL 2 LAYER OF SOD PER BMP PLANTING NOTES SPECIFIED ON THIS 3-~3 REBARS 1 m 8' LONG 1 Q
_ _ 0 TURF MATTING OR RIPRAP TO AVOID P~ % FINES (BY WEIGHT): 12°/a n FUTURE PROBLEMS WITH EROSION. % ORGANIC MATTER (BY WEIGHT): 3% T
12. ENSURE 4'PVC RISER PIPES FOR CLEANOUT ARE 45' ABOVE SOD LAYER. m STONE VERGE IS CLOGGED OR COVERED REMOVE SEDIMENT AND CLOGGED INSTALL CLEANUTSAS SPECIFIED ON THE PLAN. INSTALL 2' TALL WOODEN STAKE WASHED SAND LAYER DEPTH, FT: 0.33 FT. s~ 6. 6' ~ GROUT N PLACE o:o ' °oP A
* IN SEDIMENT (IF APPLICABLE). STONE AND REPLACE WITH CLEAN STONE. WITH FLAG TO IDENTBY LOCATION OF CLEANOUTS. #57 STONE LAYER DEPTH, Fi: 0.67 FT. (BOTTOM ELEV=194.41) 13. VERIFY TOP OF OVEI~LOW STRUCTURE IS 12' ABOVE SOD LAYER TO ENSURE ° ,p, N ° 2P/,• N eae°ee 000 000
~ THE MAXIMUM ALLOWED PONDING DEPTH IS MAINTAINED. INSTALL GRATE e°Bee°~1e
m THE PRETREATMENT AREA FLOW IS BYPASSING THE PRETREATMENT AREA. L STRUCTURE AT TOP OF OVERFLOW STRUCTURE. PRETREATMENTAREAAND/OR FLOW A 2-2" PIPES 22' z' I~/z SIDE LOxc aN A s' PLAN ELEVATION
c GULLIES HAVE FORMED, RESTABIUZE THE AREA AFTER GRADING. 14. GRADE AND INSTALL FOREBAY WITH RIPRAP AS SHOWN ON THE PLAN AND SLOPE -I6" BELOw Tq~ OF C.B. 4• I $lIP gE515iANT CLEATS Z G
~ SEDIMENT HAS ACCUMULATED TO SEARCH FOR THE SOURCE OF THE DETAILS, A DEPTH GREATER THAN THREE INCHES. SEGMENT AND REMEDY THE PROBLEM 1F 15, WATER AND FERTILIZE ACCORDINGLY TO ESTABLISH R00T SYSTEM OF SOD ELEV TOP OF STRUCTURE=204.58 ~~aRro+ ~I
i POSSIBLE. REMOVE THE SEDIMENTAND PRIOR TO BRINING STRUCTURE ONLINE. 4' THICK SOD LAYER WI APPROVED ELEV ~ P m STABN,IZE THE PRETREATMENT AREA. 16. ONCE VEGETATION IS ESTABLISHED 8V 810•RETENTION AREA, REMOVE PLUG 810•RETENTION GRASSES l TOP 0 CU l TOP OF CURB i ' : r " ~ • ' 1 ' ~ ` ' ' B" MINIMUM, 2 6'M°1. S AEBAR CORR090N 0 STANDARD CATCH BASIN OyEq 12'OEEP flE51STANT ~ -
• DITiONAI EROSION FROM 8° DIP INLET PIPE IN BYPASS CB20 TO BRING CELL ONLINE, 3 3 a EROSION HAS OCCURRED, PROVIDE AO ISEE DETAIL STD. 30.011 MATEflIAL r 12" MINw1UM UP TO Q 6' FROM TOP ~ CURB, IT (RUBBER) ~ (PIASOC)
L PROTECTION SUCH AS REINFORGED TURF NGORRIPRAPIFNEEDEDTO ~1 ~r r ,•.r ~ v v~•~~ i• u- ~ 1 EL.=19824 319.601E I$•TYP. 18 ° RCP IF s18ucT1~E Is ELEVATION SECTION A-A ~ OV,~
t PREVENT FUTURE EROSION PROBLEMS. ..;...:::,:-~:.::;-.:::•:::;w 1.11 yi GREATER 1HAN I2' z r OEEP,FOOBNG IS
0 n WEEDS ARE PRESENT. REMOVE THE WEEDS, PREFERABLY BY INSITU INSTN TO E%IENO 6' BEYOND THE STflUCNflE
o HAND. SOIL . 2.5 THICK BK~RETENTION FILTER MED SOIL ,6 COMPOSITION (BY WEIGHT) CITY OF RALEIGH ° Ij, e PUBtiC WORKS DEPARTMENT ` o
* 85%SAND c TS ARE DEAD DISEASED OR DETERM9JE THE SOURCE OF THE , THE BIORETENTION CELL PLAN 4' THICK LAYER ';129'0 FNJES (SILTICLAY) 42.5LF 18"RCP 6' ' ° 6' 1~ }
VEGETATION DYING. PROBLEM: SOILS, HYDROLOGY, DISEASE, BMP PLANTING/SODDING NOTES. WASHED SAND ?:';;?:3%ORGANIC MATTER FILTER FABRIC ETC. REMEDY THE PROBLEM AND p ; pfp ~ p e ° p° REVISIONS OAIE: 5/6/06 ORANN RY• Wt1P h" V 0.52x 87LF 18" RCP @ 6.77% dnao.°a °°p,°: ; ; : g'p~g.°pg ooQO o 5/19/04 Jii 5, 0M
S. PROVIDE A ONE TIME MIRAFI FW500 OR 0 FERTIL ZER APPLICATION TO ESTABLISH THE GRASSED BIO•RETENTION CELL APPROVED EQUAL I NV I N 0 INV IN 18" RCP INV OUT = 199.63 s/s/aswDP (FROM C8161~L00.50 tT0 STREAMI 3000 PSI CONCRETE '/n/°7wnP BASIN v Q
(FROM a GROUND COVER IF A SOIL TEST INDICATES FILTER MEDIA DEPTH REQUIRED: 2.0' ~ " , ` . ` . ` . ' , ~ ` ; _ IT IS NECESSARY. FILTER MEDIA DEPTH PROVIDED: 2.5' ` 8' THICK LAYER 857 STONE 5/31/07 JTT
(FOR PVC UNDERDRAIN SYSTEM) c -DRAWING NOT TO SCALE - STD. # 30.01 ~
€ TION CELL: MULCH f S BREAKING DOWN OR SPOT MULCH IF THERE ARE ONLY RANDOM SOD SPECIES TYPE: ~ a r - 0 THE BIORETEN Z 3 D
0 SOILS AND MULCH HAS FLOATED AWAY, VOID AREAS. REPLACE WHOLE MUCH TIFWAY (T•419) HYBRID BERMLIDAGRASS EL. -194.41 LAYER IF NECESSARY. REMOVE THE SUPPLIER CONTACT: SUPERSOD, INC. (919}836-0492 (NV I N 18 "RCP ( F NV IN 18"RCP (FROM C8191=198.44 W
" REMAINING MUCH AND REPLACE WITH 4'0 PVG PERFORATED UNDERDRAW INSiTU 2$' 8'6 PVC UNDERDRAIN MAIN LINE C * TRIPLE SHREDDED HARD WOOD MULCH AT SOD INSTALLATKNJ TO OCCUR BETWEEN MARCH 1.OCTOBER 31 HEADER LINE MINe SCHEDULE 40 PVC SOIL gHyyT MIN. SCHEDULE 4D PVC (ttl OAO%
o ~ A MAXIMUM DEPTH OF THREE INCHES, @ 0.00% (TIE TO a MAIN LINE) _ {TIE TO OVERFLOW STRUCTURE) n W ELEV BOTTOM OF STRUCTURE=197.94 :r" _
DETERMINE THE EXTENT OF THE CLOGGING 1. PREPARE TOP 4.6° OF SOIL MEDU1 BED TO ENSURE LOOSE SOIL PRK)R TO EIIO-RETENTION FILTER ELEV BOTTOM SOILS ANDIOR MULCH ARE 40LF 81"PVC aJ W
m m CLOGGED WITH SEDIMENT. • REMOVE ANO REPLACE ETTHER JUST THE SOD APPLICATION. FERTIL~EACCORDING TO SOILTEST RECOMMENDATIONS. MEDIA CROSS-SECTION m TOP LAYERS OR THE ENTIRE MEDIA AS ~ NEEDED. DISPOSE OF THE SPOIL 8V AN 2. INSTALL SOD OVER ENTIRE FILTER MEDAL AREA (-~000.5500SF) 0.50x ~ ~ ~ INV OUT = 198.44
o LATE OFFSLTE LOCATION. USE 3. WATER ONCE DAILY FOR &10 DAYS TO ENSURE ATTACHMENT OF R00T scALE: Nrs J N APPROPR 110 B30-RETENT[ON CELL) 0
a, m TRIPLE SHREDDED HARD WOOD MULCH AT SYSTEM TO SOIL MEDIA BED. m A MAXIMUM DEPTH OF THREE INCHES. BYPASS CATCH BASIN CB20 ' ,A ` , ~ O
~ SEARCH FOR THE SOURCE OF THE SOD MABNTENANCE: ~ x SEDIMENT AND REMEDY THE PROBLEM IF Z ELEVATION DETAIL ° d., ~ ~ •
a m POSSIBLE. 4. MOW GRASS TO A HEIGHT OF 1.5.2' ON A WEEKLY BASIS. ENSURE GRASS SCALE: NTS ~ y~ ~ 9
o °c AN ANNUAL SOIL TESF SHOWS THAT DOLOMTTIC LIME SHALL BE APPLIED AS CLIPPINGS ARE TRAPPED AND ARE NOT REAPPLIEDIDISTRIBUTED OVER THE GRASSED r ~ ® V SEAL l'e /
PH HAS DROPPED OR HEAVY RECOMMENDED PER THE SOIL TESTAND MEDIA SURFACE. p METALS HAVE ACCUMULATED IN TOXIC SOILS SHALL BE REMOVED, 5. THE VEGETATION IN A BIO•RETENTION CELL MAY NOT BE FERTILIZED ON A ~ 23012 ~ ~ V
z " °m THE SOIL MEDIA. DISPOSED OF PR~'ERLY AND REPLACED REGULAR BASIS. ONLYA ONE-TIME APPLICATK)N OF FERTIL17JrR TO ESTABLISH THE o ~ c WTTH NEW PLANTING MEDW. SOD IS ALLOWED. USE 16+1.8 FERTILIZER FOR THIS PURPOSE,
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d. n , ~..~r~.. rv nn_r_u~n_ uee nrv+i iooen WARFI Al1T THE IINDEI~RAIN SYSTEM.
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u ? U c N X w a THE DROP INLET CLOGGING HAS OCCURRED. CLEAN OUT THE DROP INLET. DISPOSE OF
o z THE SEDIMENTOFFSITE. NOTE: cc
a INSTALLED SYSTEM WILL MEET DESIGN SPECIFICATIONS THE ENTIRE DRAINAGE THE DROP INLET IS DAMAGED REPAIR OR REPLACE THE DROP INLET. OPERATION ONCE THE PROJECT IS COMPLETE TE AND AREA IS STABILIZED. SCALE W FEET 1~ `i4 U.
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o W THE RECEIVING WATERS EROSION OR OTHER SIGNS OF CONTACT THE NC DIVISION OF WATER o DAMAGE HAVE OCCURRED AT THE QUALITY 401 OVERSIGHT UNIT AT 919.733.1786. Op~FJ t 10 20 40 60 60 = v ® 1~ N ~ n J
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