NC0081621_Authorization to Construct_20190313

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ENGINEERS
March 13, 2019 1968.015 (34)
Mr. Ron Berry
Division of Water Resources
WQ Permitting Section—NPDES RECEPVED/DENR/DWR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617 MAR 15 2019
Subject: Water and Sewer Authorityof Cabarrus CountyWater Resource
Permitting Section
Muddy Creek WWTP
Authorization to Construct NO. 081621A02
Engineer's Certification
Dear Mr. Berry,
In accordance with Authorization to Construct No. 081621A02, attached please find the
Engineer's Certification for the subject project.
Should you have any questions, please advise.
Yours very truly,
WILLIS ENGINEERS
7We'te
Greg . Wells, P.E., BECC
Attachments
cc w/Attachments: Mr. Chad Von Cannon, P.E., WSACC
10700 Sikes Place,Suite 115
Charlotte, North Carolina 28277
704.377.9844/NC License F-0114

Water and Sewer Authority of Cabarrus County
Muddy Creek WWTP
Authorization to Construct No. 081621A02
Issued December 19, 2016
Engineer's Certification
I,' C • , as a duly registered Professional Engineer in
the State of North Carolina,having been authorized to observe 43eriodicall weekly/full time)
the construction of the modifications and improvements to the Muddy Creek WWTP,located in
Cabarrus County,hereby state that,to the best of my abilities,due care and diligence was used in
the observation of the following construction:
Replace influent pumps with two(2)new 730 gpm submersible non clog pumps;replace
existing fine screening equipment with a new manual by pass screen and a 30-inch diameter
inclined drum screen with a 1.5 MGD hydraulic capacity; install two(2)new 730 gpm
equalization basin pumps in addition to the two(2)existing; install an additional flow meter to
monitor the flow out of the EQ basin; modifications to the existing modular package treatment
units to include removal of sludge handling and surge basins and associated mechanical
equipment to expand the aeration volume into four(4)units creating a total capacity of 250,000
gallons with course bubble diffusers;replace the three(3)oldest blowers with new 1,350 SCFM
blowers; install-two(2)forty-foot diameter secondary clarifiers with 12-foot side water depth;
install three(3)new 730 gpm RAS pumps and new RAS and WAS flow meters; install a third
cloth filtration unit with a 400,000 gpd hydraulic capacity; convert four(4)7,600 gallon
secondary clarifiers to sludge holding tanks for a total of 30,400 gallon capacity; install a new
pre-engineered chemical storage enclosure; and replace UV treatment system with a new 1,460
gpm UV treatment system.
I certify that the construction of the above referenced project was observed to be built within
substantial compliance,intent and in conformity with all applicable regulations and statutes and
the project plans,specifications, and other supporting documentation comprising the
Authorization to Construct Permit Application package.
Signature Registration No. Z
°oot999991.09
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Mail this Certification to: Attn: Ron Berry ,Va.•;.
Complex Permitting Unit t • 41.
DEQ/DWR/Water Quality Programs �••;�GdN
1617 Mail Service Center
Raleigh, NC 27699-1617