NC0021121_Permit Mod for Reduction in Monitoring_20150428

CITY OF MOUNT AIRY WWTP
P.O BOX 70
MOUNT AIRY, NC 27030
PHONE: [phone]
FAX: [phone] RECEIVEDIDENRIDWR
April 16, 2015 PPR 2 8 2015
Mr. Charles Weaver Water Quality
Sed
NPDES Wastewater Permitting Unit Permittingon
1617 Mail Service Center
Raleigh,NC 27699-1617
Subject: Permit Modification for a reduction in monitoring frequencies for NPDES
Permit#NC0021121
Dear Mr. Weaver,
The City of Mount Airy requests a minor permit modification for NPDES Permit#
NC0021121 for the reduction of monitoring frequencies from five days per week(daily)
to two days per week for the parameters of BOD,TSS, and NH3N. Enclosed along with
this letter is an information packet supporting our request.
The City of Mount Airy WWTP has an excellent compliance history on all fronts. We are
honored to be able to apply for the reduce monitoring under the exceptionally performing
facilities program. The City hopes this reduction, if approved,will alleviate possible
regulatory and financial burdens. Should you have any questions or need any additional
information,please contact me at(336) 786-3597.
Sincerely,
• �D /444;,J
Christopher S. Marion
WWTP Supervisor
City of Mount Airy

DWQ Guidance Regarding the Reduction of Monitoring Frequencies in
NPDES Permits for Exceptionally Performing Facilities
October 22, 2012 RECEIVED/DENR/DWR
APR 2 g 2015
A. Purpose Water Quality
Permitting Section
In its efforts to reduce the regulatory burden upon permittees while maintaining adequate compliance
oversight over point source discharges, DWQ has developed the following guidance for the reduction
of monitoring frequencies in NPDES permits for specific target parameters. Standard minimum
NPDES monitoring frequencies are established in 15A NCAC 2B .0508 for discharges from facilities
with specific Standard Industrial Classification (SIC) categories. However, 2B .0508(b)(1) states: "If it
is demonstrated to the satisfaction of the Director that any of the tests and measurements, sampling
points, or frequency of sampling requirements, as required in this Rule for a particular SIC group, are
not applicable to the discharge of a particular water pollution control facility, or if it can be
demonstrated that the objectives of this Section can be achieved by other acceptable means then
such requirements may be waived or modified to the extent that the Director determines to be
appropriate." This document identifies criteria to be used by DWQ that satisfies the regulatory
standard for the allowance of reduced monitoring frequencies for facilities included in SIC 4952.
This guidance applies to facilities with outstanding NPDES program compliance histories, exhibiting
effluent discharges that are excellent in both quality and consistency. Such performance will
demonstrate that compliance for particular parameters can be adequately evaluated with less
monitoring. Facilities demonstrating consistent, long-term treatment performance at levels far below
effluent limitations (<50%) may be considered for a reduction in monitoring from existing permit
frequencies to a 2/week minimum frequency for the parameters BOD5r CBOD5 TSS, NH3-N and fecal
coliform/enterococci (the"target parameters").
B. Approval Criteria
Individual NPDES facilities shall submit a written request to modify their NPDES permit specifying
which parameters are to be considered for reduced monitoring . Permit holders must include with
their requests sufficient data, statistical analyses, and other information to support the justification for
reduced monitoring. NPDES permit staff shall review the application and supporting information.
Approval of reduced monitoring frequency shall be granted if all the criteria below are met:
• The facility has no more than one civil penalty assessment for permit limit violations for each
target parameter during the previous three years.
• Neither the permittee nor any of its employees have been convicted of criminal violations of the
Clean Water Act within the previous five years.
• The facility is not currently under an SOC for target parameter effluent limit noncompliance.
• The facility is not on EPA's Quarterly Noncompliance Report for target parameter limit violations.
• For BOD5, CBOD5, TSS, NH3-N and TSS, the three year arithmetic mean of effluent data must be
less than fifty percent of the monthly average permit limit. For fecal coliform or enterococci, the

•
three year geometric mean must be less than 50 percent of the monthly average permit limit. For
parameters with summer and winter limits, an annual arithmetic mean of the seasonal limits may
be used in the calculation.
• With the exception of fecal coliform or enterococci, no more than 15 daily sampling results over
the 3-year review period can be over 200% of the monthly average limit for BOD5, CBOD5, TSS,
or NH3-N . Values associated with documented impacts of extreme weather or events beyond the
control of the permittee will not be included.
• For fecal coliform or enterococci, no more than 20 daily sampling results may be over 200% of the
weekly average limit. Values associated with documented impacts of extreme weather or events
beyond the control of the permittee will not be included.
• For the four target parameters, sampling results shall not show more than two non-monthly
average limit violations during the previous year.
• Reduced effluent monitoring must not impair assessment of sensitive downstream uses, such as
endangered species.
C. Implementation
After DWQ review and approval, the facility's NPDES permit will be reissued with reduced monitoring
frequencies for qualified parameters.Additional NPDES permit requirements will include:
• Eligible facilities may be granted a reduction from existing permit monitoring frequencies to a
2/week minimum frequency for the four target parameters. Reductions will be made for both
effluent and influent sampling.
• Where monitoring is reduced to twice per week, it must occur on any two non-consecutive days
during the calendar week(Sunday through Saturday).
• Required monitoring frequency reductions establish new permit minimums for monitoring. As
always, facilities may monitor more often than required in the permit.
• If a reportable event, as defined by the permit[e.g., Part II (E) (6 &9)]occurs, any facility granted
reduced monitoring frequencies will be encouraged to monitor on a daily basis until the episode is
resolved.
Monitoring frequency reduction from the minimum frequencies reductions established by the rules are
based upon consistent, exceptional performance. DWQ may revoke on a case-by-case basis these
reductions if the facility begins to perform in noncompliance with permit limits. If a facility's monitoring
reduction for a specific parameter is removed through permit modification, reconsideration of •
monitoring frequency reduction will only occur three years following the revocation/permit modification
action, or at the next permit renewal.

1
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MOUNT AIRY WWTP NC0021121
3 Year Average monthly data for BOD
2012 January 3.69 2013 January 4.63 2014 January 6.44
February 2.69 February 3.83 February 3.25
March 4.1 March 5.04 March 2.55
April 2.79 April 4.02 April 4.87
May 5.98 May 2.47 May 3.29
June 2.35 June 4.43 June 3.63
July 4.37 July 3.76 July 2.15
August 3.53 August 2.52 August 3.11
September 2.22 September 2.41 September 2.89
October 2.09 October 2.15 October 3.04
November 2.28 November 3.13 November 3.18
December 2.41 December 4.1 December 3.78
3 year average 3.42
3 Year Effluent BOD Summary 2012-2014
Monthly Average Permit Limit 30 mg/I xi
m
50%of Monthly Average Permit Limit 15 mg/I CD, 3> iii
3 Year Average Monthly mean 3.42 mg/I ff a) '3 mm
200% of 30 mg/I Monthly Permit Limit 90 mg/I `E -6ap, m
#of Daily Results over 200% 0 _
7 vo
, v
Xi

r
1 •
MOUNT AIRY WWTP NC0021121 EFFLUENT BOD DATA 2012
January wk ave February wk avg March wk ave April wk anMay wk avg June 'wk avg July wk avg August wk avg September wk avg October wk avg November wk avg December wk avg
1 3.53 2.00 2.41 3.18 I 2.11 2.00 2.29
2r 2.05 2.98 2.51 - _ 5.56 4.19 5.42 2.08 2.10 2.00 2.61
3 2.05 2.38 4.49 2.24 2.62 3.72 2.00 2.00 2.15 2.00
r -
4 6.10 3.50 3.46 4.15 2.24 2.00 3.38 2.00 2.00 2.00
5 2.89 2.00 3.07 2.00 2.18 2.00 2.75 2.00 2.00 2.47
6 2.94 3.02 2.00 2.12 2.02 2.18 3.25 2.00 2.40 2.86 4.08
7 2.56 2.00 2.18 2.89 2.00 2.25 3.58 3.30 2.62.. 2.29
8, 3.58 2.67 2.00 3.44 2.00 2.00 2.42 2.00 2.42
9 2.92 2.04 2.92 2.00 24.70 8.28 3.48 2.62 2.24 2.52
10 3.67 2.13 2.39 5.69 2.39 2.00 2.00 2.00 2.05 2.00
11 2.41 4.63 2.78 4.69 2.41 39.10 10.00 2.00 2.00 2.00
12 10.40 2.00 3.39 2.11 2.66 2.68 2.33 2.00 2.00 2.00
13 3.75 2.00 2.56 2.39 2.60 2.45 2.38 2.16 2.29 2.33 _ 2.00
14_ 3.53 2.64 2.69 7.08 2.67 2.00 2.69 2.01 2.00
15 2.97 3.17 3.05 5.27 2.45 2.00 2.03 2.00 2.19 2.16
16_ 5.13 _ 3.20 2.00 19.60 2.05 2.00 2.00 2.11
17 3.60 2.23 3.17 6.72 2.15 2.00 2.00 2.08 2.17 2.00 _
18 2.89 2.86 2.11 2.34 6.03 3.61 3.10 2.40 2.00 2.76 2.00
19 2.21 2.45 2.41 2.23 2.25 2.00 2.03 2.00 2.00 2.40 2.08
20 2.74 2.16 2.95 2.01 2.00 2.37 2.45 2.83 2.00 2.00 2.05 2.00
21 3.36 3.72 3.85 5.69 2.00 , - 2.00 2.15 2.14 2.00
22 2.32 2.60_ 6.13 4.92 2.00 1 2.00 4.88 2.00
23 3.59 2.39 3.99 2.00 4.66 4.35 2.00 11.50 2.00
24 2.49 2.78 2.30 3.70 3.17 6.05 2.77 2.13 2.03
25 4.60 3.66 2.03 2.52 2.80 3.66 2.00 2.40 2.00 2.00 ,
26 3.08 12.00 2.12 2.00 2.00 2.00 2.17 2.00 _ 2.00 2.00
27 4.54 2.00 18.20 4.14 2.18 2.45 2.83 2.00 2.00 2.00 4.93 3.70
28 2.14 2.15 6.02 8.41 2.13 2.00 2.08 2.00 2.11 4.16
29 2.11 2.96 7.65 2.28 2.63 5.66 2.00 2.57
30 2.36 I 2.87 2.00 2.53 2.29 19.20 2.00 2.19 2.00
31 4.56 ( 2.48 3.96 2.00 2.47 2.04 2.00
Average 3.69 2.69 4.10 2.79 5.98 2.36 4.37 3.53 2.22. 209_ 2.28 2.41
Max 10.40 5.13 18.20. 5.56 24.70 3.66 39.10 19.20 3.58 2.76 3.30 4.93
Min 2.05 2.00 2.00 2.00 2.24 2.00 2.00 2.00 2.00 2.00 _ 2.00 2.00

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MOUNT AIRY WWTP NC0021121 EFFLUENT BOD DATA 2013
January wk avg February wk ova March wk avg April wk avg May wk avg June wk avg July wk avg August wk avg September wk ova October wk avg November wk avg December wk avg
1 27.50 2.46 3.25 2.00 6.94 2.19 2.00 2.00
2 2.00 3.25 2.00 2.00 3.52 2.00 _ 2.00 3.27
3 5.97 2.99 3.69 4.05 2.00 2.37 7.86 5.84 2.00 2.00 2.00 2.00
4 2.00 2.57 2.00 4.07 2.36 2.00 _ 2.00 3.71 2.00 2.25
5 2.00 2.53 5.98 2.30 3.52 5.02 2.21 2.00 2.00 2.00 2.00
6 2.00 2.28 3.11 2.84 2.00 2.48 2.00 2.00 2.00 _2.34 2.00
7 3.68 2.00 3.79 4.28 8.08 2.00 2.04 2.00 2.00
8 2.08 2.81 2.75 2.80 2.00 2.46 3.99 2.00 2.00 2.00
9 2.00 2.55 7.10 2.00 2.84 2.00 2.00 2.03 2.03 4.12
10 2.29 4.28 5.01 2.00 5.57 3.39 3.44 2.00 2.10 2.00
11 2.71 2.26 2.88 5.29 6.22 2.66 2.00 2.00 2.00 13.20 5.54
12 5.37 2.38 5.56 8.37 4.32 2.42 2.00 2.00 6.40
13 2.39 2.80 7.14 11.36 2.00 4.67 2.02 2.00 2.00 2.00
14 2.00 2.00 39.90 2.00 7.62 3.57 2.40 2.83 2.00 2.19
15 2.00 2.00 4.48 2.34 2.00 2.20 2.00 2.00 2.00 2.76
16 13.70 10.45 2.84 2.56 2.30 2.00 2.65 4.43 2.65 2.00
17 7.23 3.12 2.86 2.46 3.87 2.66 2.66 2.00 2.00 2.00
1.8 27.30 2.00 2.00 2.89 2.67 10.20 5.30 2.79 2.00 2.00 2.54 2.11
19 2.00 2.70 3.12 3.37 2.98 2.00 2.00 2.00 2.00 2.00
20 2.00 2.16 2.00 2.41 3.15 2.57 3.54 2.00 2.00 2.00 2.00
21 2.10 2.64 4.78 2.43 2.38 2.38 2.00 2.00
22 2.07 2.69 2.71 6.11 2.32 3.18 2.34 2.00 2.00 2.00
23 2.00 9.28 2.99 2.54 2.00 2.00 2.00 2.00 12.80
24 4.10 2.73 4.25 4.95 2.68 2.49 3.00 2.44 6.29 2.00
25 2.73 2.42 2.20 2.92 4.18 2.32 2.00 2.86 2.00 2.00 6.78
26 3.12 3.20 2.19 5.15 4.72 2.00 2.00 2.00 2.41 7.97 5.53
27 3.27 3.09 3.66 3.81 5.90 4.24 2.00 19.50 2.00
28 2.46 4.18 6.19 2.00 5.89 2.60 3.43 2.00
29 2.00 2.00 2.77 6.23 6.03 2.00
30 3.37 7.79 2.00 2.03 2.28 2.00 2.30 2.00 2.00 2.00 6.48
31 3.60 2.31 2.50 2.98 2.00 5.56
Average 4.63 3.83 5.04 4.02 2.47 4.43 3.76 2.52 2.41 2.15 3.13 4.1.0
Max 27.30 27.50 39.90 9.28 4.78 8.37 10.20 6.03. 6.29 4.43 19.50 13.20
Min 2.00 2.00 2.00 2.00 2.00 2.30 2.00 2.00 2.00 2.00 2.00 2.00

•
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MOUNT AIRY WWTP N00021121 EFFLUENT BOD DATA 2014
January wk avg February wk avg March wk avg April wk avg May wk avg June wk ave. July wk ave August wk avg September wk ave October wk avg November wk avg December wk avg
1 3.36 4.66 2.09 2.03 2.95 2.95 2.00
2 60.00 19.48 2.00 3.27 2.67 2.00 2.02 2.00 3.43 3.58
3 5.91 2.00 2.00 2.00 2.27 2.00 2.00 3.65 3.20 2.00 432 3.60
4 9.69 3.12 2.00 2.89 4.87 2.00 2.06 2.59 2.00 4.30
5 2.00 3.59 2.80 2.58 2.46 2.00 2.00 2.65 2.00 2.25 3.58
6 2.54 2.24 2.74 2.31 14.80 2.23 2.15 2.00 2.00
7 3.96 2.00 2.23 2.22 2.35 2.22 2.00 2.08 2.00 3.27 _
8 9.68 4.14 14.40 2.00 2.00 2.44 2.60 2.18 2.26 2.07
9 2.54 6.44 5.52 2.00 2.45 2.20 2.24 2.86 2.64 4.66
10 2.00 2.00 2.62 2.56 2.00 2.00 3.79 3.32 2.49 2.44 4.32 3.99
11 2.00 3.65 2.00 2.00 2.28 3.00 3.06 3.20 3.61
12 2.86 2.20 2.60 3.06 3.29 2.09 2.80 4.14 2.00 2.33 5.30
13 2.00 2.00 2.92 3.42 2.86 2.43 2.59 2.00 2.00
14 2.00 2.12 3.50 3.29 16.40 3.40 2.00 2.66 2.06 2.86
15 4.56 2.51 2.37 2.92 2.00 2.00 2.00 2.58 2.11
16 2.00 6.16 6.76 3.40 3.08 2.00 2.00 2.19 3.26 3.58
17 2.00 3.84 2.68 15.20 2.93 2.00 3.50 3.20 2.52 3.01 4.12 3.53
18 9.29 3.44 2.27 2.81 2.00 6.07 3.95 4.88 3.72
19 2.27 4.52 2.22 2.51 2.00 2.00 2.73 4.37 2.07 3.54 4.13
20 5.10 2.19 2.00 3.77 5.20 4.52 7.71 2.43
21 2.24 2.08 2.02 2.00 2.00 2.19 3.84 4.06 2.10 5.32
22 2.00 2.00 2.33 2.05 4.52 2.63 2.30 4.51 2.34
23 n/a 2.08 7.92 4.29 2.63 3.98 2.00 2.38 2.94 2.82 2.25 2.30
24 2.00 5.42 2.36 4.00 4.36 2.00 2.24 2.52 7.62 7.54
25 2.00 2.18 5.52 4.87 4.90 2.00 2.99 2.19 6.25 5.26
26 2.00 2.68 2.00 2.16 4.40 5.55 2.58 2.00
27 4.02 2.00 2.06 2.25 6.88 4.14 3.39 2.38
28 8.38 2.00 2.20 3.98 2.54 2.00 2.00 2.24
29 7.05 4.69 2.94 2.41 2.44 2.04 L 2.27 3.08 2.15 2.82 2.42
30 2.00 9.82 4.93 2.54 2.00 2.02 2.02 2.08 3.48 6.75 4.95
31 2.00 2.00 2.00 I 3.84 6.30
Average 6.44 3.25 2.55 4.87 3.29 3.63 _ 2.15 3.11 _ 2.89 3.04 3.18 3.78
Max 60.00 9.69 3.65 15.20 16.40_ 14.80 3.84 6.07 4.37 7.71 7.54 6.75
Min 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00

w
MOUNT AIRY WWTP NC0021121
3 Year Average monthly data for TSS
2012 January 3.04 2013 January 4.67 2014 January 7.27
February 3.77 February 4.24 February 2.65
March 7.45 March 5.65 March 3.38
April 5.64 April 6.36 April 7
May 9.52 May 2.89 May 2.62
June 4.38 June 6.87 June 3.22
July 6.29 July 4.95 July 2.7
August 3.18 August 3.38 August 6.38
September 2.03 September 3.68 September 7.45
October 1.76 October 2.46 October 5.98
November 2.87 November 4.17 November 5.3
December 2.18 December 3.94 December 6.01
3 year average 4.59
3 Year Effluent TSS Summary 2012-2014
Monthly Average Permit Limit 30 mg/I
50% of Monthly Average Permit Limit 15 mg/I
3 Year Average Monthly mean 4.59 mg/I
200% of 30 mg/I Monthly Permit Limit 90 mg/I
#of Daily Results over 200% 0

MOUNT AIRY WWTP N00021121 EFFLUENT TSS DATA 2012
January wk avg February wk avg March wk ave Apra wk avg May wk ave June ,wk ave July wk avg August wk avg September wk avg October wk avg November wk avg December wk avg
1 10.00 2.00 _ 4.33 1.00 2.67 1.50 3.5
2 7.50 6.40 2.50 4.00 8.00 2.33 4.33 2.20 2.50 _ 4.0
3 2.00 7.50 3.50 2.50 , 5.47 4.00 1.33 3.00 2.40 3.50
4 3.00 2.67 4.00 3.63 5.00 _ 1.00 4.46 1.00 2.50 1.00
5 2.67 3.00 3.00 1.00 1.00 1.00 2.50 2.0 1.67 1.63
6 3.00 4.00 2.33 6.50 2.70 10.50 4.67 1.33 1.33 2.5 1.00
7 4.33 3.00 3.07 , 6.50 _ 3.00 1.33 2.00 3.0 2.10 1.00
8 4.33 4.48 3.33 2.00 , 2.00 3.67 3.48 1.50 1.5
9 2.50 4.00 3.67 8.00 18.00 8.50 9.00 5.75 1.67 1.5
10 1.00 5.75 6.50 7.00 . 2.33 2.00 3.67 1.67 1.43 3.00
11 2.00 3.60 8.50 7.60 9.00 , 5.67 53.00 13.27 2.33 1.33 2.50
12 9.50 _ 5.67 14.00 11.00 1.00 3.00 2.53 1.00 _ - 2.00 2.70
13 3.00 1.00 6.67 1.00 9.00 6.93 1.00 4.33 1.33 2.5 3.50
14 4.00 7.33 5.93 18.00 5.00 , 2.33 2.33 3.0 2.63. 2.50
15 3.67 3.73 6.00 8.50 . 4.00 , , 2.33 2.40 2.00 3.0
16 6.00 4.00 8.00 30.00 17.20 7.00 1.33 1.50 2.0
17 2.00 4.00 7.00 16.00 _ 7.50 1.67 2.33 1.50 1.50 1.00
18 5.00 2.38 2.67 6.13 13.50 , 11.50 9.50 5.87 1.33 1.00 1.00
19 1.00 4.00 7.00 3.00 3.00 3.00 2.17 1.50 2.5 _ 2.50 1.30
20 130 1.33 2.00 6.00 4.00 5.50 2.33 3.67 1.67 2.5 2.00 1.00
21 1.33 6.00 3.70 19.00 . 7.00 . . 1.33 2.50 10 1.00
22 1.00 1.86_ 5.50 11.00 2.00 1.33 3.02 2.00
23 3.33 3.33 1.00 3.33 8.00 10.30 3.50 6.00 1.00
24 1.67 2.33 5.00 6.00 4.33 2.75 2.00 1.50 1.40
25 3.67 3.13 5.33 4.43 7.50 4.00 6.00 3.17 2.33 1.00
26 3.50 37.00 4.50 2.00 1.00 2.00 197 1.50 2.0 1.33
27 3.50 1.00 19.00 4.00 2.00 3.06 1.00 2.33 1.50 4.0 550 4.05
28 1.00 1.63, 22.00 19.20, 3.33 , 2.33 2.00 4.0 4.00 5.33
29 1.67 15.00 7.50 . 3.97 3.00 4.07 2.33 6.5
30 2.33 1 3.00730 1.00 2.62 1.00 11.00 2.00 2.87 3.5
31 4.67 I 1.00 1.67 1.67 2.50 1.00
Average 3.04 3.77 7.45 5.64 9.52 4.38 6.29 3.18, 2.03. 1.76 2.87 2.18,
Max 9.50 10.00 37.00 14.00 30.00 11.50 53.00 11.00 3.67, 3.00 _ 6.50 5.50,
Min 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.33 1.00 1.00 1.00 1.00

MOUNT AIRY WWTP N00021121 EFFLUENT TSS DATA 2013
January wk avg February wk avg March wk avg April wk avg May wk avg June wk avg July wk on August wk avg September wk avg October wk avg November wk avg December wk avg
1 32.00 3.0 4.50 3.00 5.00 2.00 3.00 1.50
2 1.50 5.50 3.00 3.10 2.50 2.00 4.33 2.50
3 2.00 1.38 4.00 5.40 3.50 2.00 6.67 5.54 4.00 6.00 4.30 3.00
4 1.00 2.00 4.0 4.00 6.00 2.67 4.67 2.00 4.00 2.60
5 2.50 4.0 9.00 2.00 4.80 8.00 3.00 2.50 3.42 1.00 1.00
6 1.00 2.00 10.5 4.60 1.50 4.00 1.00 4.50 3.50 2.80 2.50
7 8.00 2.00 2.5 6.00 10.00 3.50 3.30 2.00 6.50
8 1.50 2.50 2.0 5.00 2.00 2.60 9.00 5.00 4.50 1.00
9 1.67 2.83 11.00 2.50 5.50 4.00 2.50 4.00 3.20 7.00
10 1.50 8.00 8.37 1.00 10.00 6.00 5.85 3.00 3.50 3.00
11 1.50 1.00 3.5 8.50 4.50 5.25 3.00 2.70 2.00 6.00 4.30
12 2.50 3.5 9.37 16.00 12.70 3.50 2.00 2.00 6.00 4.50
13 3.50 2.00 6.0 11.00 3.00 12.00 3.50 3.00 1.50 1.00
14 1.00 2.00 38.0 1.00 21.00 3.50 2.60 2.00 5.50 5.00
15 2.00 1.00 4.0 2.00 3.50 250 3.00 2.00 2.00 7.00
16 15.00 9.10 2.00 2.50 4.00 2.00 7.50 1.50 1.70 2.00
17 7.50 3.00 3.00 2.50 6.00 3.50 4.50 2.50 2.00 1.00
18 20.00 1.33 3.0 4.00 7.00 9.00 2.50 350 1.00 1.50 4.00 2.40
19 2.00 3.0 4.00 7.33 5.57 3.00 4.50 2.50 1.00 2.00
20 5.50 2.87 1.0 2.00 3.50 5.00 250 2.50 3.67 2.30 3.00
21 1.00 2.0 1.00 2.50 3.50 3.57 1.00 1.67
22 3.50 4.50 1.0 16.00 5.00 3.90 3.00 1.33 2.50 3.67
23 5.50 14.00 7.50 7.00 6.00 4.40 4.00 1.90 12.70
24 9.00 4.88 9.00 10.00 2.50 3.00 2.24 3.15 6.00 1.00
25 1.50 4.00 3.0 650 5.00 2.50 7.00 5.08 1.00 5.50
26 2.50 2.5 4.50 5.50 4.40 1.00 3.67 4.50 6.50 5.50 6.73
27 7.00 4.30 5.5 5.50 4.50 7.00 3.50 16.00 9.33 2.00
28 3.00 5.00 11.0 2.00 4.00 6.00 4.60 1.00
29 2.50 3.00 2.00 10.00 4.00 1.00
30 5.50 9.30 3.00 2.50 2.25 4.50 2.33 3.50 150 1.20 8.00
31 3.50 2.50 4.67 4.63 1.00 4.00
Average 4.67 4.24 5.65 6.36 2.89 6.87 4.95 3.38 3.68 2.46 4.17 3.94
Max 20.00 32.00 38.00 16.00 750 21.00 10.00 7.00 7.50 6.00 16.00 12.70
PAM 1.00 1.00 1.00 2.00 1.00 2.00 1.00 1.00 2.00 1.00 1.00 1.00.

MOUNT AIRY WWTP N00021121 EFFLUENT TSS DATA 2014
January wk avg February wk avg March wk avg April wk avg May wk avg June wk avg July wlc avg August wk avg September wk avg October wk avg November wk avg December wk avg
1 2.33 6.00 2.5 2.50 9.00 5.00
2 2.00 6.75 1.67 2.00 6.00 2.0 2.87 5.00 9.33 7.10 5.00
3 1.3.00 3.00 5.00 2.00 2.10 3.00 2.0 5.61 6.60 5.0 5.60 5.16
4 5.50 6.00 2.00 5.50 4.90 6.00 5.13 5.62 5.0 5.20
5 3.50 3.80 1.50 4.30 1.00 6.00 6.00 6.74 5.0 5.00 5.00
6 5.50 3.50 3.00 2.00 4.00 5.00 5.50 5.00 5.0
7 4.50 3.50 6.00 5.00 1.00 1.80 3.5 5.00 5.20 5.0
8 6.00 5.00 14.00 1.00 3.0 5.50 7.00 7.50 5.78 5.00
9 5.50 7.00 7.40 4.00 2.50 2.5 3.20 6.83 6.20 5.00
10 3.50 1.50 1.00 1.00 2.33 4.0 10.00 7.41 5.00 5.0 5.20 5.28
11 1.33 4.00 10.00 1.00 1.87 3.0 5.00 6.10 5.00
12 2.50 1.47 8.00 4.60 1.00 1.50 7.14 7.14 5.0 5.00 6.20
13 3.67 1.00 6.00 4.00 2.00 6.00 5.63 5.00 5.0
14 4.50 1.00 4.00 2.00 10.00 3.60 4.0 5.00 6.00 5.0
15 4.50 3.33 8.00 1.00 4.0 5.00 6.10 9.05 6.05 5.00
16 2.50 7.00 9.50 2.00 3.50 3.0 3.10 6.33 5.00 5.00
17 1.50 3.50 4.00 21.00 2.37 3.5 12.40 9.71 5.20 5.00 5.00
18 2.00 1.00 2.50 2.87 1.0 11.00 12.00 5.0 5.00
19 2.00 3.40 1.00 2.80 1.00 3.00 5.71 11.70 5.0 5.00
20 3.50 2.00 2.00 3.00 6.28 8.98 5.00 5.0 5.16
21 4.50 6.00 6.00 3.00 2.00 2.40 3.0 10.90 5.00 5.0
22 2.00 6.00 1.00 3.0 11.00 7.60 5.00 5.12 5.8 5.00
23 5.00 3.13 24.00 9.40 6.00 4.00 1.5 2.00 8.60 5.60 5.00 5.00
24 1.00 2.00 3.00 6.00 1.50 1.5 8.86 7.57 5.00
25 4.50 1.00 8.00 3.50 2.90 1.0 5.00 7.60 9.3
26 1.00 1.94 2.00 2.00 2.50 6.67 5.20 5.0 6.43
27 28.00 1.00 1.00 5.00 3.00 9.05 6.17 5.00 5.0
28 23.00 1.20 3.00 7.00 1.00 1.0 5.00 7.80
29 20.50 16.70 2.00 1.00 2.00 1.5 5.13 5.60 5.00 5.56 6.20
30 6.00 8.00 5.20 1.00 5.00 6.5 2.80 5.00 5.00 11.10 11.00
31 6.00 2.50 2.5 5.00 15.70
Average 7.27 2.65 3.38 7.00 2.62 3.22 2.70 6.38 7.45 5.98 5.30 6.01
Max 28.00 6.00 8.00 24.00 10.00 6.00 6.50 11.00 12.40 9.33 9.30 15.70
Min 1.00 1.00 1.00 1.00 1.00 1.00 1.00 2.50 5.00 5.00 5.00 5.00

MOUNT AIRY WWTP NC0021121
3 Year Average monthly data for NH3N
2012 January 0.28 2013 January 0.74 2014 January 0.31
February 0.13 February 0.18 February 0.13
March 0.12 March 1 March 0.13
April 0.13 April 0.95 April 0.33
May 0.52 May 0.14 May 0.45
June 0.12 June 0.82 June 0.83
July 1.69 July 0.29 July 0.1
August 0.27 August 0.1 August 0.12
September 0.11 September 0.12 September 0.12
October 0.11 October 0.18 October 0.18
November 0.12 November 0.41 November 0.38
December 0.71 December 0.56 December 0.11
3 year average 0.36
3 Year Effluent NH3N Summary 2012-2014
Monthly Average Permit Limit 13 mg/I
50%of Monthly Average Permit Limit 6.5 mg/I
3 Year Average Monthly mean 0.36 mg/I
200% of 13 mg/I Monthly Permit Limit 39 mg/I
#of Daily Results over 200% 0

Y
MOUNT AIRY WWTP NC0021121 EFFLUENT NH3N DATA 2012
January wk ave February wk avg March wk avg April wk avg May wk avg June wk avg July wk avg August wk avg September wk avg October wk avg November wk avg December wk avg
1 0.1 0.1 0.1 0.1
2 0.152 0.12 0.1 0.121 0.13 0.139 0.1 0.10
3 0.1 0.1 0.194 0.14 0.182 0.1 0.1 0.1 0.10 0.13
4 0.1 0.11 0.128 0.1 0.11 0.204
5 0.13 0.117 0.1 0.1 0.13 0.1 0.11 0.13 0.13
6 0.109 0.1 0.13 0.1 0.1
7 0.1 0.11 0.1 0.162 0.13 0.143
8 0.1 0.13 0.187 0.136 0.14
9 0.1 0.1 2.51 0.90 0.1 0.118
10 0.1 0.186 0.403 0.177 0.1 0.1 0.10 0.29
11 0.1 0.74 0.1 0.10 0.1 0.1 18.6 0.1
12 2.03 0.1 6.37 0.1 0.10 0.198 1.44
13 0.205 0.1 0.1 0.10 0.112 0.36 0.1
14 0.148 0.12 0.258 0.1 0.1 0.11 3.83
15 0.285 0.20 0.111 0.273 0.28 0.308 0.137
16 0.1 0.149 2.86 1.10 0.261
17 0.1 0.1 0.1 0.12 0.201 0.1 0.1 0.17 0.223
18 0.1 0.11 0.1 0.178 0.1 0.1 0.16
19 0.129 0.1 0.1 0.10 0.106 0.115 0.232 0.29
20 0.116 0.1 0.11 0.138 0.132 0.117 0.11
21 0.147 0.13 0.148 0.1 0.102 0.424
22 0.1 0.11 0.143 0.107 0.61 0.1
23 0.1 0.135 0.117 0.1 0.17 0.137
24 0.1 1.59 0.1 0.1 0.10
25 0.166 0.17 0.1 0.17 0.249 0.1 0.1 0.11
26 0.134 0.1 0.10 0.1 0.165 0.254
27 0.239 0.1 0.298 0.172 0.13 0.1 0.1 2.49 0.99
28 0.1 0.10 0.1 0.11 , 0.1 0.122 0.14, 0.21.5
29 0.1 0.286 0.105 0.256 0.23 0.1
30 0.1 0.256 0.29 0.1 0.10 0.134
31 0.315 0.348 0.1
Average 0.28 0.13 0.12 0.13 0.52 0.12 1.69 0.27 0.11 0.11 0.12 0.71
Max 2.03 0.29 0.15 0.30 2.86 0.19 18.60 1.59 0.20 0.31 0.17 3.83
Min 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.13

4..
MOUNT AIRY WWTP N00021121 EFFLUENT NH3N DATA 2013
January wk avg February wk avg March wk avg April wk avg May wk avg June wk avg July wk avg August wk avg September wk avg October wk avg November wk avg December wk avg
1 0.146 0.1 0.322 0.1
2 0.176 0.1 0.10 0.1 0.10 0.33
3 0.259 0.18 0.1 0.42 0.1 0.1 1.1.8 0.75 0.1 0.1
4 0.11 0.345 1.00 0.1 0.12 0.126 0.1 0.20
5 1 0.403 1.11 0.758 0.153 0.16
6 0.168 0.21 1.00 1.00 0.1 0.182 0.14 0.164
7 0.128 2.84 0.1 0.12 0.901
8 0.112 1.00 1 0.1 0.10 0.474 0.49 0.1
9 0.1 0.12 0.1 0.1 0.1 0.1 0.125
10 0.81 1.38 0.1 0.264 0.1 0.31
11 0.139 0.183 1.00 0.716 0.1 0.16 0.836 0.37
12 2.34 0.327 0.44 0.1 0.1
13 0.1 0.17 1.00 1.00 0.103 0.279 0.1 0.10 0.152
14 3.85 0.724 0.1 0.10 0.1 0.1
15 2.93 2.85 0.217 1.00 1 0.1 0.10 0.1
16 1.77 1 1.00 0.1 0.1 0.1 0.10 0.1
17 1 0.1 0.1 0.1 0.10
18 0.164 1.00 0.1 0.10 0.1 0.1 0.494 0.23
19 0.139 0.44 0.106 0.1
20 0.1 0.14 1.00 1.00 0.1 0.1 0.1 022 0.1
21 _ 1.08 0.1 0.10 0.1
22 0.24 0.143 1.00 1 0.178 0.27 0.103 0.146
23 0.155 0.22 0.102 0.1 0.1 0.12 2.31
24 0.25 1 1.00 0.521 0.646 0.1 0.10
25 0.181 1.00 0.1 0.10 0.151 0.1 0.91
26 0.209 0.20 1.00 1.00 1 1.41 1.27 0.1 0.1 0.107 1.27 0.281
27 0.209 1.00 0.1 3.61 0.126
28 0.216 0.1 1.75 0.1 0.10 0.1
29 0.216 0.31 0.128 0.14 0.181 0.1 0.10
30 0.504 0.184 0.1 0.18 0.1 1.48
31 0.244 0.1 1.2 0.90
Average 0.74 0.18 1.00 0.95 0.14 0.82 0.29 0.10 0.12 0.18 0.41 0.56
Max 3.85 0.35 1.00 2.34 0.52 2.84 1.18 0.15 0.28 0.90 3.61 2.31
Min 0.10 0.10 1.00 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10

•
MOUNT AIRY WWTP N00021121 EFFLUENT NH3N DATA 2014
January wk avg February wk avg Mardi wk avg April wk avg May wk avg June wk avg July wk avg August wk avg September wk avg October wk avg November wk avg December wk avg
1 0.21 0.1 0.1 0.1
2 0.1 0.161 0.19 0.368 0.1 0.10 0.137 0.133 0.11,
3 0.246 0.166 0.206 0.1 0.1 0.12 0.1 0.1 0.1 0.10
4 0.117 0.95 0.1 0.133
5 0.164 0.17 0.1 0.12 0.187 0.1 0.10 0.1
6 2.37 0.1
7 0.18 0.1 0.1 1.83 0.1 0.16 0.1 0.1 _
8 2.45 0.95 0.118 0.1 0.14 0.108 0.11 0.1
9 0.211 0.179 0.70 0.193 0.135 0.118 0.11 _ 0.124
10 0.116 0.1 0.1 0.1 0.11 0.1 0.1 0.10
11 0.1 , 0.1 0.11 0.1
12 0.1 0.11 0.1 0.11 0.313 0.1 0.1 0.10 0.1
13 0.1 0.1 0.1 0.284
14 0.102 0.135 0.113 3.55 1.32 0.1 _ _ 0.1
15 0.1 0.11 0.1 0.15 0.1 0.173 0.1 0.17, 0.1
16 0.23 0.1 , 0.199 0.1 0.10
17 0.141 0.1 0.1 0.1 0.14 0.124 1.11 0.1 0.10
18 I 0.108 0.20 0.1 0.227
19 0.141 0.11 0.1 0.11 0.249 0.132 1.34 0.88 0.1
20_ _ 0.298 0.1 0.92
21 0.1 0.1 0.121 0.107 0.135 0.19 0.1 0.18 ,
22 0.1 0.10 0.139 0.112 0.1 0.38 0.1
23 0.1 0.234 , 0.17 0.182 1.67 0.1 0.10 0.1 0.10
24 0.1 0.165 0.1 0.10 0.123 0.28
25 0.16 _ 2.15 2.05 0.1 0.139
26 0.1 0.12 0.1 0.16 0.1 0.72 0.42
27 0.213 0.154 _ 2.34 0.1 , 0.135
28 0.156 0.214 0.135 0.1 0.13 0.1 0.27
29 0.1 0.16 0.1 0.45 0.123 _ 0.1 0.10 0.1 0.1 0.11 0.1
30 1.12 0.1 0.1 0.14
31 0.171 0.1 0.23
Average 0.31 0.13 0.13 0.33 0.45 0.83 0.10 0.12 0.12 0.18 0.38, 0.11
Max 2.45 0.25 0.21 1.83 3.55 2.37 0.12 0.23 0.17 0.92 1.34, 0.23
Min 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10