NC0084212_Permit (Modification)_20020710

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Mr. Bruce M. Pratt
Davie County Water System
261 Chaffin Street
Mocksville, North Carolina 27028
Dear Mr. Pratt:
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
July 10, 2002
Subject: Modification of NPDES Permit NCO084212
Sparks Road WTP
Davie County
The subject permit was issued on May 24, 1999. A review of the permit file by Division personnel noted a
typographical error on the effluent page of your permit. The limits for Settleable Solids were incorrectly expressed in
mg/L. This modification corrects the error, showing the limits expressed in ml/L.
Please find enclosed the revised effluent page, which should be inserted into your permit. The old page may then
be discarded. All other terms and conditions contained in the original permit remain unchanged and in full effect.
This permit modification is issued under the requirements of North Carolina General Statutes 143-215.1 and the
Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit modification are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days
following receipt of this letter. This request must be a written petition conforming to Chapter 150B of the North
Carolina General Statutes, filed with the Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North
Carolina 27699-6714). Unless such demand is made, this decision shall be final and binding.
If you have any questions concerning this permit modification, please contact Charles Weaver of the NPDES
Unit at [phone], extension 511.
Sincerely,
,iftAan W. Klimek, P.E.
cc: Central Files
Winston-Salem Regional Office, Water Quality Section
NPDES Unit
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer VISIT us ON THE INTERNET @ http://h2o.enr.state.nc.us/NPDES

Permit NC0084212
A. (IL.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — FINAL
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as
specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
fre uenc
Sample Type
Sample Location
Flow
Weekly
Instantaneous
Effluent
Total Suspended Solids
30.0 m L
45.0 m /L
2/Month
Grab
Effluent
Settleable Solids
0.1 mVL
0.2 mVL
Weekly
Grab
Effluent
Turbidity'
50 NTU
Weekly
Grab
Upstream & Downstream
Iron
Weekly
Grab
Effluent
Total Residual Chlorine2
Weekly
Grab
Effluent
H1
Weekly I
Grab I
Effluent
Footnotes:
1. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the
instream turbidity exceeds 50 NTU due to natural background conditions, the discharge cannot cause
turbidity to increase in the receiving stream.
2. Total Residual Chlorine monitoring is required only if filters are backwashed with chlorinated water.
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be
monitored weekly at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

settleable solids
Subject: settleable solids
Date: Tue, 19 Feb 2002 16:05:18 -0500
From: jeanne Phillips <[e-mail]>
To: Charles Weaver <[e-mail]>
CC: walt scheper <[e-mail]>
Charles,
We have some parameters in BIMS with unit -of -measure not allowable. I'm trying to
clear up this list. Two permits NCO068365 and
unit -of -measure for parameter 00545. The only a��Yowable uom for 00545 is ml/l. I
looked at these two permits and they were written with a uom of mg/l. Is mg/1
correct and therefore we need to have EPA add mg/l as an allowable uom for settleable
solids, 00545, or does there need to be a permit correction to ml/l?
Jeanne
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