NC0081621_More Information Received_20190116

WWATER&SEWER AUTHORITYOF CABARRUS COUNTY
232 Davidson Hwy,Concord,NC 28027
704.786.1783 • 704.795.1564 Fax
Rocky River Regional WWTP
6400 Breezy Lane,Concord, NC 28025
ISO 14001:2004•NC Star Public Sector•HAS 18001:2001 704.788.4164 • 704.786.1967 Fax
January 16, 2019 www•wsacc.org
Monti Hassan
Pretreatment Unit
NC DEQ—PERCS Unit
1617 Mail Service Center
Raleigh,N.C. 27699-1617 RECEIVED/DENR/DWR
SUBJECT: LONG TERM MONITORING PLAN JAN 21 2019
RRRWWTP NPDES PERMIT#NC0036269 Water ResourcesMCWWTP NPDES PERMIT#NC0081621 Permitting Section
Dear Mr. Hassan:
Please find enclosed the amended pages of long term monitoring plan(LTMP) for
the Rocky River Wastewater Treatment Plant (RRRWWTP), NPDES Permit#
NC0036269 and Muddy Creek Wastewater Treatment Plant (MCWWTP), NPDES
Permit # NC0081621. Per NCDEQ's request, cobalt and tin were added to the
RRRWWTP monitoring since we have one Centralized Waste Treatment facility. We
also added the priority pollutant scan monitoring for the MCWWTP based upon the new
NPDES permit.
Please review the LTMP changes and approve at your earliest convenience. If
you have any questions, please do not hesitate to contact me at [phone], ext. 112
or [e-mail].
Sin erely,
1 �
everly K. Metcalf ,
Environmental,Health& afety
Compliance Manager
BKM
Enclosure

WSACC
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ISO 14U l •NVSIazPuSScSector•0E131BVU11 V1
ROCKY RIVER REGIONAL WASTEWATER TREAMENT PLANT
SAMPLING SCHEDULE
SAMPLING SAMPLING DETECTION SAMPLE
PARAMETER FREQUENCY LOCATION LEVEL TYPE
FLOW(EFFLUENT) Daily Effluent
BOD 4/Month Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 2.0 mg/L Composite
CBOD 2/Week Combined Influent,Effluent 2.0 mg/L Composite
COD 1/Month Combined Influent,Effluent 10.0 mg/L Composite
TSS Daily Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 2.5 mg/L Composite
Ammonia 2/Week Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 0.1 mg/L Composite
Arsenic 1/Quarter Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 1.0 ug/L Composite
Beryllium 1/Quarter Combined Influent,Effluent 1.0 ug/L Composite
Cadmium 1/Quarter Combined Influent, 1°Effluent, Step If 2°Effluent,Effluent 1.0 ug/L Composite
Chromium 1/Quarter Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 1.0 ug/L Composite
Cobalt 3/5 Years(2) Effluent 50 ug/L Composite
Copper 1/Quarter Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 1.0 ug/L Composite
Lead 1/Quarter Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 1.0 ug/L Composite
Mercury 1/Quarter(1) Combined Influent, 1°Effluent, Step II 2°Effluent 0.2 ug/L Composite
1/Quarter(1) Effluent 0.001 ug/L Grab
Nickel 1/Quarter Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 1.0 ug/L Composite
Selenium 1/Quarter Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 2.0 ug/L Composite
Tin 3/5 Years(2) Effluent 10 ug/L Composite
Zinc 1/Quarter Combined Influent, 1°Effluent, Step II 2°Effluent,Effluent 2.0 ug/L Composite
Priority Pollutant Scan 3/5 Years(2) Effluent Composite/Grab
NOTES:
(1)Method 1631 will be used for the effluent mercury analysis. Cold Vapor Method will be used for all
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WSACC
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MUDDY CREEK WASTEWATER TREAMENT PLANT
SAMPLING SCHEDULE
SAMPLING SAMPLING DETECTION SAMPLE
PARAMETER FREQUENCY LOCATION LEVEL TYPE
FLOW(EFFLUENT) Daily Effluent
BOD 2/Week Influent,Effluent 2.0 mg/L Composite
COD 2/Week Influent,Effluent 10.0 mg/L Composite
TSS 2/Week Influent,Effluent 2.5 mg/L Composite
Ammonia 2/Week Influent,Effluent 0.1 mg/L Composite
Arsenic 4/Month Influent,Effluent 1.0 ug/L Composite
Cadmium 4/Month Influent,Effluent 1.0 ug/L Composite
Chromium 4/Month Influent,Effluent 1.0 ug/L Composite
Copper 4/Month Influent,Effluent 1.0 ug/L Composite
Lead 4/Month Influent,Effluent 1.0 ug/L Composite
Mercury(1) 1/Quarter Influent,Effluent 0.2 ug/L Composite
Nickel 4/Month Influent,Effluent 1.0 ug/L Composite
Selenium 4/Month Influent,Effluent 2.0 ug/L Composite
Zinc 4/Month Influent,Effluent 2.0 ug/L Composite
Priority Pollutant Scan 3/5 Years(2) Effluent Composite/Grab
(1)Cold Vapor Method will be used for all mercury analyses.
(2)3/5 Years will mean monitoring shall occur three(3)times per five(5)year permit cycle.
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WSACC
IS0140014WS• $ PhrcSttloi•UMW
WATER&SEWER AUTHORITY OF CABARRUS COUNTY
SAMPLING SCHEDULE
INDUSTRIAL UNCONTROLLABLE INTERCEPTORS SEPTAGE RRRWWTP MCWWTP
PARAMETER FREQUENCY(pg 4) FREQUENCY(pg 6) FREQUENCY(pg 8) FREQUENCY(pg 10)FREQUENCY(pg 9) FREQUENCY(pg 9)
BOD All 1/Quarter 4/Month 1/Quarter 4/Month 2/Week
CBOD 2/Week
COD All 1/Quarter 4/Month 1/Quarter 1/Month 2/Week
TSS All 1/Quarter 4/Month 1/Quarter Daily 2/Week
Ammonia All 1/Quarter 4/Month 1/Quarter 2/Week 2/Week
Arsenic 8/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 4/Month
Beryllium 1/Quarter 1/Quarter 1/Quarter 1/Quarter
Cadmium 8/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 4/Month
Chromium 8/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 4/Month
Cobalt 3/5 Years
Copper 8/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 4/Month
Lead 8/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 4/Month
Mercury 2/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 1/Quarter
Nickel 8/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 4/Month
Selenium 8/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 4/Month
Tin 3/5 Years
Zinc 8/Year 1/Quarter 1/Quarter 1/Quarter 1/Quarter 4/Month
Priority Pollutant Scan 3/5 Years 3/5 Years
NOTES:
Please refer to the page listed above for frequency definitions.
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