SW3220302_As-Built - Certification_20240403 (2)

Post-Construction Stormwater Management
Permit No. SW3220302
AS-BUILT DESIGNER'S CERTIFICATION FOR SAND FILTER 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.1056, 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 #?
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 certifyi g the project.
Check here if pictures of the SCM are provided.
Printed Name Jay Henson Signature atiNC Registration Number 700 Date 1/31/2024
SEAL: \\\\0 0iClA0iii �/ Consultant's Mailing Address:
121 Gilead Road
?: r '-7 City/State/ZIP Huntersville, NC 28078
*: N 0 , .* _
Phone Number•
704-875-1615
•'. Consultant's Email address:
/0iA I i i \\\\ [e-mail]
O Circle N if the as-built value differs from the Plan/permit. If N is circled, provide an explanation on
page 2
ON/E = not evaluated (provide explanation on page 2) ©N/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 .1056) OAs-built OO N/E ©N/A
A. Two-chamber system
1. Does the Sand Filter include a Sediment chamber and a or N
Sand chamber?
2. The storage volume in each chamber is equivalent. Y or N
3. The incoming stormwater is evenly distributed across the 'Oor N
surface of the sand.
B. Volume / Elevations
1. The volume of water stored in the sediment chamber and on
top of the sand in the sand chamber is at least 0.75 times the OY or N
treatment volume.
2. The elevation of the bypass device is set at or above the Oor N
ponding depth associated with the storage volume.
3. The ponding depth above the sand surface is six feet or less. 0 or N
C. Sand Media / Drawdown / SHWT
1. Does the sand media meet ASTM C33 or equivalent? YOor N
2. The depth of the sand media is consistent with the approved YOor N
plans and specs and is a minimum of 18".
3. The depth of the sand media over the underdrain is
consistent with the approved plans and specs and is a OY or N
minimum of 12 inches.
4. The sand media provides a minimum drawdown of two O or N
inches per hour at the sand surface.
5. Open-bottom design —the minimum separation to the SHWT
at the lowest point of the sand filter is consistent with the Oor N
approved plans and specs and is a minimum of 2 feet.
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Post-Construction Stormwater Management
Permit No. SW3220302
6. Closed -bottom design —The minimum separation to the \
SHWT at the lowest point of the sand filter is consistent with Y or N
the approved plans and is a minimum of 1 foot.
7. At least one capped clean-out pipe has been provided at the YOor N
low point of each underdrain.
Provide an explanation for every MDC that was not met, or for every deviation from the permitted
condition below:
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