NC0077143_Correspondence_20130926

Q 24
CCDENR
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
Division of Water Resources
Water Quality Programs
Pat McCrory Thomas A. Reeder John E. secretary
III
Governor
Director Secretary
September 26, 2013
Lisa Smith -Perri
General Manager n fERQUAI
West Carteret Water Corporation4104 NC Highway 24 OCNewport, NC 28570
Subject: Effluent Composite Sam ling Protocol DENR-
P POINT SOURCE SRP
NPDES Permit No. NCO077143
West Carteret Water Corporation
Carteret County
Dear Ms. Smith -Perri:
Thank you for the opportunity to meet with you and your staff on September 24, 2013, to discuss the
current and proposed sampling protocol for your NPDES Permit. Based on our meeting it is my
understanding that samples are currently collected four times per year from the Iron vessel backwash,
two times per year from the color vessel backwash and six times per year from the softener vessel
backwash to satisfy the monitoring requirement for those parameters that are sampled once per month.
Each step in the regeneration process is sampled separately (once per each step) and a flow
proportional composite is made based on the flow from each step. Flow meter readings on each of the
three treatment system's backwash discharge lines are used for the respective adjustment of sample
volumes.
As we discussed yesterday, the preferred sample location would be from the three treatment systems'
common force main utilizing a flow meter on the force main to communicate with a continuous
composite sampler or utilizing the instantaneous readings from the flow meter to create a flow
proportional composite from a series of grab samples over a 24 hour period. Currently, there is a
sample port on the common force main but no flow meter. Until such time as a flow meter is installed
on the common force main, sampling from the individual backwash discharge lines during a softener or
color filter backwash cycle, as you are currently doing, is acceptable. Please keep in mind that the
composite sample is a 24 hour composite. Any backwash cycle that occurs during that 24 hour period
would have to be captured in the composite sample, e.g., you may be sampling four softener and one
color filter backwash cycles in a single 24 hour period. All samples collected have to include a color
filter or softener discharge event. Toxicity sampling must coincide with quarterly sampling for Total
Copper and Total Zinc and must also be collected during a softener or color filter discharge event. In
order to insure the composite samples are representative of the entire discharge for a specific 24 hour
Wilmington Regional Office
127 Cardinal Drive Extension Wilmington, NC 28405
Phone: [phone] / FAX: [phone]
Internet: www ncwaternualitv.or¢
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period, more than one grab sample per each step in the regeneration process may need to be collected
to create the composite for that cycle.
Please let me know your thoughts and /or concerns moving forward with a different sampling protocol
under the new permit. I would like to have a revised plan and schedule for sampling from you
approved as soon as possible since the new permit becomes effective on October 1, 2013. Also based
on your comments at our meeting, we will be issuing a technical correction to the permit to change the
number of green sand iron filters from three to four. I apologize for that oversight. Please feel free to
call me anytime to discuss this matter at [phone].
Sincerely,
Ji regson
Regional Supervisor, Water Quality Programs
Cc: Ron Berry (NPDES Complex Permitting Unit)
Central Files
WiRO Permit Files
Page 2 of 2

Berry, Ron
From: [e-mail]
Sent: Wednesday, September 25, 2013 4:32 PM
To: Berry, Ron
Cc: Gregson, Jim; Coburn, Chad
Subject: Re: Clarification on Salinity Measurements NC0077143
Thanks for the clarification.
ki
Lisa D. Smith -Perri, GM/ED
West Carteret Water Corporation
4102 Hwy 24, Newport, NC 28570
O - [phone] Ext 20
M - [phone]
F - [phone]
lisa.smithoerri anwcwc.biz
www.wcwc.biz
---Original Message—
From: Berry, Ron
Date: 9/25/2013 4:27:42 PM
To: Lisa Smith -Perri
Cc: Greg on, Jim; Coburn, Chad
Subject: Clarification on Salinity Measurements NC0077143
Ms. Smith -Perri:
It has come to my attention from the Division's Certification Lab that the approved EPA method for measuring salinity is practical salinity units
(psu) not part per thousand (ppt). I regret the unit were stated as ppt on your permit. Please measure and report the correct units for salinity as psu and
advise your lab of the correction.

I am coping the Wilmington Regional Office of this correction in case any future salinity compliance question arises.
Ron Berry
Environmental Engineer I
Complex Permitting Unit
NCDENR/DWR/Water Permitting Section
Phone: (919) 807 - 6396
Email: ron.berry&ncdenr.gov
Fax: (919) 807 - 6489
Location Address - Archdale Building, Office 925Y
512 N. Salibury St.
Raleigh, NC 27699
Mailing Addrsss - Archdale Building, NCDENR/DWR
1617 Mail Service Center
Raleigh, NC 27669-1617