SW6230903_Stormwater Narrative_20231102

Track & Field Renovations
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SCHOOLS North Moore High School
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Moore County Schools
1504 N.Moore Rd.
Robbins, NC
State Stormwater Permit
Supporting Documents
Narrative
Revised Final Submittal
October 31, 2023
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Stormwater Narrative
Project Description
North Moore High School is renovating the existing 400-m running track and associated field events on
the school campus at 1504 N. Moore Rd. in Robbins,NC. The renovations include the removal of the
existing track pavement and reconstruction in the same location. Existing pavement of the existing field
events will also be removed and reconstructed with the locations being adjusted slightly. The majority of
the grass play field inside the track will remain undisturbed.
Just under two(2) acres of ground will be disturbed during construction which is scheduled to begin in
late Fall of 2022 and continue until Summer of 2023.
No streams or wetlands are impacted by the proposed construction.
The site is located within the Cape Fear River Basin and within a Non-Coastal High Quality Waters
watershed. The site is not located within %2 mile of SA waters.
Current Stormwater Permit Status
The campus had an existing High-Density State Stormwater Management Permit(SW6 190501)that was
issued on May 29,2019 associated with a project titled North Moore High School Renovation and
Addition. The permit covers the entire 49.57-acre school property. It is believed this is the first and only
State Stormwater Permit issued for this site.
The 2019 project added 28,709-sf of new built-upon area(BUA)and included the construction of a new
bioretention cell to manage runoff from the new BUA.
The SW6 190501 permit documents that the entire 2,159,496-sf(49.57-ac)campus contained 596,267-sf
(13.69-ac)of existing BUA and added 28,709-sf(0.66-ac)of new BUA as part of the original 2019 permit
equating to 28.9%BUA.
Stormwater Permit Modification
The new Track&Field Renovations project will add 14,595-sf of new BUA to the campus. This addition
of BUA will require a Major Modification to the existing SW6 190501 permit.
Combined with the 28,709-sf of BUA added by the 2019 project,the site will now contain 43,304-sf of
"New BUA"(14,595-sf+28,709-sf)plus the original 596,267-sf of"BUA associated with Existing
Development"for a total project density of 29.6%.
The addition of the proposed 14,595-sf of BUA associated with the new Track&Field Renovations
project plus the previous 28,709-sf of BUA added in 2019 was calculated to result in an Average Runoff
Volume(ARV)increase of 6%from the 49.57-ac campus. Since this increase is less than the allowable
10%,the proposed project permit modification is in compliance with section.1003 of the 02H Rules.
On December 13,2022 NCDEQ issued Fast Track ATC Permit No. SWA000176 for the track
improvements which replaced the original Permit No. SW6 190501. SW6 190501 was rescinded effective
December 13, 2022.
Construction Sequence
There is no future development proposed for the current Track&Field Renovations project,however
other improvements on the school campus in the future are likely. Future improvements will require
subsequent modifications to the campus's SWA 000176 permit. Compliance with current stormwater
rules will likely require additional SCMs or demonstration of compliance with Runoff Volume Match.