NC0020591_Authorization to Construct_20150615

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City of Statesville
Third Creek Wastewater Treatment Plant Expansion
A To C No. 020591A03 7ArriAL F(cATIviV
Issued February 5,2013
Engineer's Certification
I, ---,int( A.W144rd ? (V1 l 'A as a duly registered Professional Engineer in
the State of North Carolina, having been authorized to observe(periodically/weekly/full time)
the construction of the modifications and improvements to the Third Creek WWTP, located on
444 Third Creek Road in Iredell County for the City of Statesville,hereby state that, to the best
of my abilities, due care and diligence was used in the observation of the following construction:
Installation of two(2) mechanical bar screens each rated for a peak flow of 22.5
MGD with screenings washer/compactor and conveyor; an influent pump station
with four(4)3,500 gpm pumps; dual grit vortex removal systems, each chamber
rated for 15.0 MGD peak flow with a 250 gpm grit pump, and one grit •ssifier
and screenin:s screw conve or• an aerobic reactor flow splitter box• • dual train
oxidation ditch biological nutrient removal treatment system, with each train
consisting of three(3) 56,300 gallon(each) anaerobic basins each equipped with a
3 Hp mixer, a 0.399 MG anoxic basin equipped with a 10 Hp mixer, and a 2.434
MG aerobic oxidation ditch -. i teed with two(2) 125 Hp surfa - • - ators and a �`
rec de flow control gate. a clarifier flow splitter .ox; two (2) 110 ft diameter, 18 r'1ife; e14°r
foot side water depth c arifiers; a new RAS/WAS pump station with three(3) '" , b�
2,905 gpm RAS/WAS pumps; a 234,000 gallon dual-channel chlorine contact
basin; an 8,200 gallon dechlorination basin; a 79,000 gallon post aeration basin rar►r .h,�
with two(2) 15 hp floating surface aerators; a liquid sodium bisulfate storage and ( ct,#c
feed system; the addition of three(3)25 Hp floating surface aerators in the
existing 0.93 MG aerobic digester; a dual 300 gpm sludge pump station;
conversion of an existing 2.40 MG aeration basin to an aerobic digester including
six (6)60 Hp mixers; a refrigerated com•osite sam.ler; a 750 kW eme •enc
generato - y•r• piping an. appurtenances, electrical controls, instrumentation, and
site work n co ormity wi e proje p ans, spec ications, an. o er 6..
supporting data subsequently filed and approved by the Department of .W011,
Environment and Natural Resources. pw+rla G� btert
tetfiiu►�on,
I certify that the construction of the above referenced project was observed to be built within
substantial compliance and intent of the approved plans and specifications.
We understand that the new limits associated with the modifications to expand to 6.0 MGD now
apply.
Signature Registration No. 03/$67
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Mail this Certification to: Attn: Ken Pohlig, P.E. J
Infrastructure Finance Section - '031. 'G _ = �`
DENR/DWQ • `; ••F G I `.'_. •
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1633 Mail Service Center '(o• • :' � o�.`
Raleigh,NC 27699-1633 ;!��r��vdh`t,\\\