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UNDERDRAIN PIPE SHALL BE SCHEDULE 40 PVC,
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5DR35, OR SMOOTH WALL CORRUGATED PLASTIC f _
PIPE WITH fig"PERFORATIONS AT G" ON CENTER(4 3n >c�5 [G'�} n7 f f t
HOLES PER ROM REFER TO TABLE FOR.PIPE SIZE, ❑
SIORETENTION 501E INV.-345.5
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MIN I i�iTl= I TI BIORETENTION 501L NOTES: W
BIORETENTION 501L MIXTURE {BSM): SHALL BE PLACED AND GRADED USING LOW GROUND-CONTACT PRESSURE EQUIPMENT
TOUND
INSTALLED
PIPE OR BY EXCAVATORS AND/OR BACKHOES OPERATING ON THE GROUND ADJACENT TO THE B1ORETENTION FACILITY. NO HEAVY Lu
FL BE INSTALLED EQUIPMENT SHALL BE USED WITHIN THE PERIMETER OF THE BIORETENTION FACILITY BEFORE, DURING, OR AFTER THE
\ \ ` FLAT AT 0%SLOPE n .
PLACEMENT OF THE BSM. THE BSM SHALL BE PLACED IN HORIZONTAL LAYERS NOT TO EXCEED 12 INCHES FOR THE ENTIRE �I
5'WEIR LENGTH SPILLWAY BOTTOM AND AREA OF THE BIORETENTION FACILITY. THE 55M SHALL BE COMPACTED BY 5ATURATING THE ENTIRE AREA OF THE
SLOPES TO BE STABILIZED BIORETENTION FACILITY AFTER EACH LIFT OF B5M 15 PLACED UNTIL WATER FLOWS FROM THE UNDEKDRAIN. WATER FOR
WITH PERMANENT ER05EON SATURATION 5HALL BE APPLIED 5Y SPRAYING OR 5PRINKLING. AN APPROPRIATE 5EDIMENT CONTROL DEVICE SHALL BE USED
NATIVE COIL, N❑ "LAREFNRTO GRADING CONTROL MAT TO TREAT ANY SEDIMENT-LADEN WATER DISCHARGED FROM THE UNDERDRAIN. 1F THE 55M BECOMES CONTAMINATED
COMPACTION PLAN FOIR TOP OF � Z
DAM ELEVATION DURING THE CON5TRUCTI0N OF THE FACILITY, THE CONTAMINATED MATERIAL SHALL BE REMOVED AND REPLACED WITH
UNDERDRAIN I �55 SECTION ANTS} REFER TO GRADING UNCONTAMINATED MATERIAL AT NO ADDITIONAL C05T TO THE ADMINISTRATION. FINAL GRADING OF THE B5M SHALL BE
PLAN FOR SPILLWAY PERFORMED AFTER A 24-H0UR SETTLING PERIOD. FINAL ELEVAT10N5 5HALL BE WITHIN 2 INCHES OF ELEVATIONS SHOWN ON
ELEVATION 3 .,, r�f `✓`r /��� THE CONTACT PLANS. az
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THE BIOKETENT10N SOIL MIXTURE (B5M) SHALL BE A UNIFORM MIX, FREE Of 5TONE5, STUMPS, ROOTS, OR OTHER 51MILAR Q
\�f OBJECTS LARGER THAN 2 INCHa=5 EXCLUDING MULCH. NO OTHER MATERIALS OR 5U55TANCE5 SHALL BE MIXED OR DUMPED z
WITHIN THE 510RETENTION AREA THAT MAY BE HARMFUL TO PLANT GROWTH, OR PROVE A HINDRANCE TO THE PLANTING OR W
MAINTENANCE OPERATIONS.
PERMANENT EROSION MAT TO BE �--
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MAX PONDING DEPTH5 A50VE PLANTING 5URFACE: NOTES: P-300 BY NORTH AMERICAN GREEN, D
MIRAMAT BY MIFAFI CORP, DR PRIOR TO PLACING THE UNDERDRAIN AND THE BSM, THE BOTTOM OF THE EXCAVATION SHALL BE ROTO-TILLED TO A MINIMUM � �
1 2" - WATER QUALITY DE51GN VOLUME I . THE PHOSPHORUS INDEX FOR THE DEPTH OF G INCHES TO ALLEVIATE ANY COMPACTION OF THE FACILITY BOTTOM. ANY 5U55TITUTE METHOD FOR ROTO-TILLING
501E MEDIA 5HALL NOT EXCEED 3D. APPROVED EQUAL MUST BE APPROVED BY THE ENGINEER PRIOR TO USE. ANY PONDr=D WATER SHALL BE REMOVED FROM THE BOTTOM OF THE
!8" - PEAK ATTENUATION OUTLET ELEVATION
24" - PEAK ATTENUATION VOLUME 2. THE INFILTRATION RATE FOR THE 501L FACILITY AND THE 501L SMALL BE FRIABLE BEFORE ROTO-TILLING.
MEDIA 5HALL DE AT LEA5T I IN/HR 5ECTION THROUGH 5FI LLWAY (NT5) � 0
SiORETENTION AREA #I DESIRED BlORETENTION SOIL MIXTURE PH LIES BETWEEN 5.5 AND 6.5.
PERMANENT
CLEANOUT P05T WI MINIMUM WEIR 5
CLEANOUT MARK STABILIZE BOTTOM LENGTH (PT)
CID CD
AND SLOPES WITH CAPPED CLEAN UNDERDRAIN PIPE 4
CENTIPEDE SOD OUT PIPE DIAMETER(IN) NOTES:
MINIMUM NUMBER OF 2 I . ALL MATERIAL5 AND METHOD5 OF CONSTRUCTION SHALL BE I ACCORDANCE WITH CITY OF RALEIGH STANDARD5
12„PON DING UNDERDRNN PIPES AND 5PECIFICATION5,
2. BOUNDARY AND EX15TING CONDITIONS INFORMATION WAS TAKEN FROM A DIGITAL FILE PROVIDED BY ELINGBURG I�
CLEANOUT 340Z LAND SURVEY COMPANY.
ELEVATION (FT) 3. TOPOGRAPHIC INFORMATION FOR THE 517E WAS TAKEN FROM A DIGITAL F1LE PROVIDED 8Y ELINGBURG LAND LL
SURVEY COMPANY,
NLL 501L MEDIA 4. NO FEMA MAPPED FLOOD PLAINS EY15T ON TH15 51TE PER FEMA MAP NUMBER 3 7 200 75700J DATED MAY 2,
TOP OF 810RE-I'ENTION 349,5 . • MINIMUM 18"DEEP }}....
MIX: /� :- / 200G. i-
501L MIXTURE ELEV. (FT) n �`. DEPTH=1 2" RIP-RAP \ \
75-65%MEDIUM TO CdAR,SE SANf� \f� � �\ 5. THE SITE I1A5 SEEN REVIEWED FOR WETLANDS, NEU5E RIVER BUFFERS AND CRE1=KS, BY SdIL�ENVIRONMENTAL U
8-1 0%FINE5(51LT 4 CLAY) Dso-1 2 w.: EX15TING
5-10%ORGANIC MATTER FILTER FABRIC BOTTOM OF BIORETENTION 347.0 Z' � CONSULTANTS, INC. THE BUFFERED STREAM IS BASED ON TOP OF BANK SURV)=1'Sri0T5 6Y ELINGBLIRG LAND
501E MIXTURE ELEV. {FI} f �`� GROUND 5GALf FAWN
(OR CHOKING � SURVEY COMPANY.
DEPTH' 2.5' j2" IW5 STONE)RC G. CONTRACTOR SHALL HAVE NORTH CAROLINA 51 1, INC. LOCATE ALL EXI5T1NG UTILITIE5 PRIOR TO BEGINNING 1 "=20' PDC
BOTTOM OF BIORETENTfON 34G.0 I . ' CON5TRUCTION.
4"WASHED SAND #57 STONE ELEVATION (7) F, /;� �f\;.. f 7. THE LOT 2 DUPLEX ENCROACHMENT INTO ZONES I AND 2 OF THE NEU5E RIVER BUFFER HAS SEEN APPROVED BY DATE
\:•�\ . .;�\ \ \r� ,\\r PERMITTING THROUGH THE NCDWIR[PERMIT NO. DWR#20-0357].
8"#57 5TDNE 5HWT 344.0 BOTTOM WIDTH = 5' S. CONDITIONS OF APPROVAL UNDER NCDWR PERMIT NUMBER DWR#20-0357 INCLUDE APPROVAL Of A DECEMBER 1 , 2020
BOTTOM ❑F ELEVATION (FT) WITH GEOTEXTILE LINER 5TORMWATER MANAGEMENT PLAN FOR LOT 2 AND PAYMENT OF COMPENSATORY MITIGATION FOR THE NEU5E
_ 2'+ DISTANCE RIVER SUFFER IMPACT5. REVISION
510-34G.o N SITU 501E TO WAT}=R UNDERDRAIN GROUND SURFACE 346.5 5. ALL PERMANENT 5LOPE5 IN51DE THE 610-RETENTION AREA SHALL BE GRADED TO 3:1 OR FLATTER. 02/09/21 NCDWR COMMENTS,
TABLE ELEVATION (FT) 10. THE S1ORETENTION AREA SHALL BE LOCATED WITHIN A PRIVATE DRAINAGE EA5EMENT WITH ACCESS TO A PUBLIC
SHWT=344.0 _ _ _ EMERGENCY SPILLWAY DITCH DETAIL
WATER TABLE- - . - -- , - • -- _ . - _ . . _ . . _ - SPILLWAY WEIR) 350.5
_ . . _ . . _ . . _ . . _ . . _ . . _ . . � . . _ . . _ . . _ . . _ ELEVATION (FT
NOTe5: N.T.5. 0 10 20 40
B f O BETE N T I O N C R05 5-5 E CT I O N ELEVATIONOIFB {EMT} 351 .5 1 LINEKTO
ONSEW ERI=LTD O 1130TTOMLOCATED.D 51DE SLOPES DF DITCH IN ALL
Ft@ET
GRAPHIC 5CALE
PROJECT
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