NC0024872_Report_20180816

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ROY COOPER NORTH CAROLINA
Governor Environmental Quality
MICHAEL S.REGAN
Secretary
LINDA CULPEPPER
Interim Director
August 16,2018
Mr.Johnny Lambert, Public Utilities Director
Public Works Complex
298 East Depot Street RECEIVED/DENIRJDWR
Mocksville, NC 27028 AUG 2 2 2018
SUBJECT: Pretreatment Audit Inspection Report Water Resources
Cooleemee Wastewater Treatment Plant Permitting Section
NPDES Permit No. NC0024872
Davie County
Dear Mr. Lambert:
On August 2, 2018, Paul DiMatteo of this office conducted a Pretreatment Audit Inspection at the above
referenced wastewater treatment system.Johnny Lambert, Public Utilities Director,John Grey,Acting Pretreatment
Coordinator,Tim Smith, Operator in Responsible Charge, and Joy Howard of Grey Engineering were present for the
inspection.The purpose of this inspection was to determine the effectiveness of the pretreatment program,which
included: a detailed file review, review of the POTW facility performance,sampling and compliance judgement program,
adherence to the enforcement response plan, and observing an industrial user inspection.
Background
The County operates a 1.5 MGD facility and has one non-categorical industrial user: Ingersoll Rand.
Pretreatment Program Elements Review
The Headworks Analysis (HWA) renewal was submitted on October 3, 2016 and was approved on March 3, 2017.
The next HWA is due by September 30,2021.
The last Industrial Waste Survey(IWS)was submitted on April 30, 2015 and was approved on May 15, 2015.The
next IWS is due by April 30, 2020.
The last Short-Term Monitoring Plan (STMP)was submitted on March 12, 2018 and was approved on March 28,
2018.
The Sewer Use Ordinance (SUO)was approved on December 30,2013. Mr. Grey reported that the SUO was
updated on November 6, 2017, but that there were no changes related to pretreatment.
NORTH CAROUNA �/i'
Department d Emm
llwmtta10n0tY
North Carolina Department of Environmental Quality I Division of Water Resources
Winston-Salem Regional Office 1450 Hanes Mill Road,Suite 300 I Winston-Salem,North Carolina 27103
336.776.9800

The Enforcement Response Plan was approved on July 2, 2010.
STMP Review
POTW reported that the next round of short-term monitoring was to begin in 2019. Please remember to
conduct such monitoring at the proper locations and frequencies.
Industrial User Permit(IUP) File Review
A review of the file for Ingersoll Rand (#0004) revealed that the monitoring data was well organized and
compliant.The slug control plan was in good order.
Industrial Inspection
Ingersoll Rand is a compressor manufacturer that is managed by a local permit.The inspection included a
thorough review of the plant and treatment process.The industry submits process control data and copies of certified
lab analysis reports to the POTW. Please see the attached inspection form for sampling review recommendations.
The pretreatment audit is satisfactory.The program is being implemented in an excellent manner. If you should
have any questions, please do not hesitate to contact Paul DiMatteo at(336)776-9691 or our office at(336)776-9800.
Sincerely,
..,AettAx:r 14.--yiJ
Sherri V. Knight, P.E., Regional Supervisor
Water Quality Regional Operations Section
Winston-Salem Regional Office
Division of Water Resources, NCDEQ
Enclosure—PAI Report
CC: PERCS Unit—Monti Hassan
WSRO Files
Central Files
John Grey—by email at [e-mail]