NC0084387_Permit Modification_20010724

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Mr. John C. Huber
CMUD
5200 Brookshire Boulevard
Charlotte, North Carolina
Dear Mr. Huber:
Michael F. Easley
w Governor
William G. Ross, Jr., Secretary
NCDENR North Carolina Department of Environment and Natural Resources
Kerr T. Stevens, Director
Division of Water Quality
28216
July 24, 2001
Subject: NPDES Permit Modification
Permit NCO084387
North Mecklenburg WTP
Mecklenburg County
Division personnel received your request to modify the subject permit on July 18, 2001. After a review of the
turbidity data you submitted, the Division does not object to your request. Accordingly, the subject permit has been
modified as follows:
➢ Instream monitoring for turbidity has been deleted and replaced with a turbidity limit of 50 NTU at the
effluent.
Please find enclosed the revised effluent page. The revised page 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,
c
�.
Kerr T. Stevens
cc: Central Files
Mooresville Regional Office, Water Quality Section
Point Source Compliance Enforcement Unit
NPDES Unit
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Vlslr us ON THE INTERNEr @ hftp://h2o.enr.state.nc.ustNPDES

Permit NC0084387
A. (I.) EFFLUENT LMTATIONS AND MONITORING REQUIREMENTS
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
Frequeng
Sample Type
Sample Location
Flow
Weekly
Instantaneous
Effluent
Total Suspended Residue
30.0 mg/L
45.0 mg/L
2/Month
Grab
Effluent
Settleable Solids
0.1 ml/L
0.2 ml/L
Weekly
Grab
Effluent
Turbidity'
50 NTU
Weekly
Grab
Effluent
Iron
Weekly
Grab
Effluent
Total Residual Chlorine
Weekly
Grab
Effluent
Aluminum
Weekly
Grab
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.
All samples must be collected from a typical discharge event.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Mr. Charles Weaver
NC DENR DWQ NPDES
1617 Mail Service Center
Raleigh, NC 27626-1617
•
(MARLOTTL.
July 13, .2001
John Huber, Superintendent
City Of Charlotte
Water Treatment Division
5200 Brookshire Blvd.
Charlotte, NC 28216
SUBECT: Effluent Discharge Sampling Proposal
Alum Residuals Facilities
North Mecklenburg Water Treatment Plant
NPDES Permit No. NCO084387
Mecklenburg Co., NC 28078
Dear Mr. Weaver,
Based upon discussions with you via telephone with Randy Hawkins North Mecklenburg
Wastewater Treatment Plant ORC, on July 12, 2001, we would like to submit a change for our
North Mecklenburg Water Treatment Plant NPDES permit # NC0084387.
We are requesting that you consider our NPDES monitoring to consist of only the effluent
sampling and for us to cease taking upstream and downstream samples based upon our plant
performance.
Attached is two years worth of data showing our effluent turbidities. The turbidities are
consistently below 50 ntus. If we somehow exceed 50 mus as per our conversation we would
report the incident as a violation.
Thank you for consideration on modifying our permit.
If you have any questions you can contact me by calling (704)-399-2426 Extension 222.
Sincerely,
Qp...'r &/�
John Huber, Superintendent
Water Treatment Division
City Of Charlotte
Cc: Randy Hawkins
Tom McEver
Water Treatment 5200 Brookshire Boulevard Charlotte, NC 28216 704/399-2426
Charlotte -Mecklenburg Utility Department

North Mecklenburg Water Treatment Effluent Turbidities
Year 1999 Data
Month Turbidity Mouth Turbidity
June
1
2.1
December
8
2.0
7
0.5
15
1.6
14
4.0
22
1.6
21
2.5
30
1.8
28
1.0
July
6
1.4
13
1.1
20
2.6
27
1.6
August
3
1.8
10
1.7
17
2.5
24
2.0
31
2.2
September
7
2.8
14
1.2
21
1.4
28
NA
October
5
1.1
12
1.7
19
0.8
26
1.0
November
2
1.0
9
0.6
16
1.0
23
1.0
30
0.8

Year2000 Data
Month Turbidity Month Turbidity
January
July
4
1.0
5
<0.5
11
3.7
11
<0.5
18
1.5
18
<0.5
25
2.6
25
<0.5
February
August
1
2.0
1
<0.5
8
1.0
8
0.5
15
2.8
15
0.6
22
0.7
27
0.5
March
September
7
1.0
5
<0.5
14
1.0
12
<0.5
21
1.0
19
0.5
28
0.5
26
0.6
April
October
4
3.6
3
1.1
11
1.0
10
1.6
18
2.5
17
<0.5
25
1.4
24
<0.5
May
November
2
3.8
7
1.3
9
3.0
14
0.5
16
1.7
21
<0.5
23
1.1
28
1.5
30
1.5
June
December
6
1.1
5
1.4
13
0.7
12
1.7
21
0.5
19
0.8
27
<0.5
27
1.2

Year 2001 Data
Month Turbidity
January
2 0.8
9 1.6
16 2.5
23 0.5
February
6 1.0
13 0.9
20 1.2
27 1.5
March
6
1.1
13
0.5
20
1.1
27
1.2
April
3 0.6
10 0.9
17 0.6
24 1.6
May
8 0.6
IS 1.0
22 0.9
29 0.6
June
6
2.2
12
0.58
19
1.0
26
4.6