NC0089702_NOV-2021-LV-0082 RSP_20210217

id Atlantic
Engineering 1 Environmental Solutions
February 17, 2021
North Carolina Department of Environmental Quality
Division of Water Resources
Raleigh Regional Office
Attention: Vanessa E. Manuel, Assistant Regional Supervisor
3800 Barrett Drive
Raleigh, North Carolina 27609
409 Roger, View Court
Raleigh, NC 17610
office 919 250.9918
facsimile 919 250.9950
MAAONLINE.COM
NC Dept OfEn vironmentaI Quality
FEB ` 2 2021
Raleigh Regional Office
Subject: RESPONSE TO NOTICE OF VIOLATION
BRIGHTLEAF ON MAIN
1001 WEST MAIN STREET
DURHAM, DURHAM COUNTY, NORTH CAROLINA
NPDES PERMIT NO. NC0089702
TRACKING NUMBER NOV-2021-LV-0082
Dear Ms. Manuel:
On behalf of Brightleaf Durham Associates LLC, Mid -Atlantic Associates, Inc. submits this
letter in response to a Notice of Violation (NOV-2021-LV-0082) dated February 9, 2021.
The NOV references one condition identified by DEQ during review of the December 2020
Discharge Monitoring Report (DMR). The condition and our response to address these
conditions are as follows:
Condition: The maximum discharge of 6,500 gallons per day as prescribed by the
NPDES permit was exceeded on December 25, 2020.
Response: The water being discharged under this permit originates from groundwater
located beneath a partially subterranean parking deck which underlies an apartment
building. Groundwater in this part of Durham is shallow and dewatering beneath the
parking deck is required to maintain dry conditions in the parking structure. From
December 24 to 25, 2020 approximately 2 inches of precipitation fell in Durham. The
increased aquifer recharge caused by the heavy rainfall necessitated additional discharge
through the treatment system to dewater the parking structure. We also believe that runoff
infiltrating into the vault containing the pumps may have contributed to the amount of
water that needed to be discharged.
Because the rate at which the system operates is driven by weather, the combination of
increased aquifer recharge from heavy precipitation and the potential infiltration of runoff
into the vault explains the discharge exceedance. To address this flow exceedance,
facility maintenance staff have taken action to further seal the vault doors to reduce
infiltration into the pump vault. Facility maintenance staff will also confirm that the
— EXPERIENCED CUSTOMER FOCUSED INNOVATIVE

Response to NOV
Brightleaf on Main
Durham, North Carolina
February 17, 2021
Page 2
measures taken to seal the vault doors are still in place. Unfortunately, we are unable to
control the rate the system operates at in response to increased aquifer recharge.
if you have any comments or questions on our response to these conditions, please
contact me at 919-250-9918. We recognize the importance of permit compliance and we
have taken actions to address the deficiencies.
Sincerely,
MID ATLANTIC ASSOCIATES, INC.
Daniel H. Nielsen, P.E.
Principal Engineer
Cc: Robert Fyffe, Zaremba Management Company
Mid Atlantic