SW5220302_As-Built Designer's Certification (Bioretention)_20220502

Post -Construction Stormwater Management
Permit No. SWA000073
AS -BUILT DESIGNER'S CERTIFICATION FOR ISIORETENTION CELL PROJECT ,
i hereby state that I am a licensed professional and I certify by my signature and seal below, that I ,
have observed the construction of the project named above to the best of my abilities with all due care
and diligence, and that the project meets all of the MDC found in NCAC 02H.1052, in accordance with
the permit documents, plans and specifications on file with or provided to the Division, except as
noted on the "AS -BUILT" drawings, such that the intent of the stormwater rules and the general
statutes has been preserved.
Check here if this is a partial certification. Section/phase/SCM #? 1
x Check here if this is part of a Fast -Track As -Built Package Submittal per .1044(3).
Check here if the Designer did not observe the construction, but is certifying the project.
Check here if pictures of the SCM are provided. / �.
�' 13
f • 1 �' � w� � � � Printed Name T t �'� � +� Signature ►f�j�/�j//��
NC Registration Number a j� ^7 & / 2- Date !S ) 4 f 1 2-
SEAL: N,`\\Z�'+eCAR4��i,�
;•4 SEAL Fes:
033612 =
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Consultant's Mailing Address:
5410 Trinity Road, Suite 102
city/state/zip Raleigh/NC/27607
Phone Number 919 866-4505
Consultant's Email address:
frank.slinsky�mmons.com
O Circle N if the as -built value differs from the Plan/permit. If N is circled, provide an explanation on
page 2
®N/E = not evaluated (provide explanation on page 2) ON/A = not applicable to this project or SCM.
This Certification must be completed in conjunction with the General MDC certification under NCAC
02H.1050
Consultant's Certification (MDC .1052)
OAs-built
ON/E
WA
A. Volume / Elevations
1. The lowest point of the bioretention cell is a minimum of two
O or N
feet above the SHWT.
2. if separation from the SHWT is between one and two feet, a
hydrogeological evaluation has been prepared by a licensed
Y or N
N/A
professional.
3. The surface area and depth of the bioretention cell is
or N
consistent with the approved plans.
4. The planting surface elevation of the bioretention cell is
0 or N
consistent with the approved plans.
5. The ponding depth for the design volume is consistent with
_
Y or N
the approved plans and a maximum of 12 inches above the
planting surface.
6. If applicable, the ponding depth for the peak attenuation
Y or N
volume is consistent with the approved plans and a
maximum of 24 inches above the planting surface.
7. If applicable, the peak attenuation outlet invert is consistent
`.J or N
with the approved plans and a maximum of 18 inches above
the planfing surface.
8. Bioretention cell with IWS — An underdrain system with IWS
has been provided. The top of the IWS zone is consistent
O or N
with the approved plans and a minimum of 18 inches below
the planting surface.
9. Bioretention cell without IWS — The in -situ soil infiltration rate
is at least two inches per hour immediately prior to the initial
Y or N
N/A
olacement of media.

Post -Construction Stormwater Management
Permit No. SWA000073
10. At least one capped clean -out pipe has been provided at the
Y N ;
low point of each underdrain.
or
B. Media
_
1 , The depth of the media is consistent with the approved plans
and specs and is a minimum of...
- 36 inches for cells with trees & shrubs.
Y or N
30 inches for cells without trees & shrubs and IWS.
- 24 inches for cells without trees & shrubs and no IWS.
2. The media is consistent with the approved plans and specs
and is a homogeneous soil mixture consisting of...
- 75 — 85 percent by volume medium to coarse washed sand.
Y or N
- 8 —15 percent by volume fines.
- 5 — 15 percent by volume organic matter.
3. The media has a phosphorous index (P-index) that does not
exceed...
- 30 in Nutrient Sensitive Waters (NSW).
Y or N
- 50 elsewhere.
4. The media has not been mechanically compacted.
Y or N
5. The media provides a minimum drawdown of one inch per
Y N
hour at the plantingsurface.
or
C. Landscape/Planting Plan
1. Bioretention cell with sod — The sod is a non -clumping, deep-
Y N
rooted species.
or
2. Bioretention cell with vegetation other than sod — The
Y N
approved landscaping Ian has been followed.
or
3. Bioretention cell with vegetation other than sod — Triple
shredded hardwood mulch is placed two to four inches deep
Y or N
in the portion of the bioretention cell that will be inundated.
Provide an explanation for every MOC that was not met, or for every deviation from the permitted
condition below: