NC0024210_Permit Modification_19990111

Alate of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
January 11, 1999
Mr. Thomas P. Gore, Plants Division Manager
City of High Point
Public Services Department
P.O. Box 230
High Point, North Carolina 27261
NC ENR
NORTH CAROLINA DF-PARTmENT OF
ENVIRONMENT AND NA;rURAL RESOURCES
Subject: NPDES Permit Modification
Permit No. NCO024210
High Point—Eastside WWTP
Guilford County
Dear Mr. Gore:
A permit modification request and check for $100.00 (#302493) was received by the NPDES Unit on November
9, 1998. After review of the request, the modifications to your NPDES permit as discussed below have been
approved. This modification will become effective January 1, 1999.
The draft modifications, based on the Division's review, are listed below:
Cyanide daily maximum limit has changed to 22 gg/l, and a weekly average of 5.0 gg/l has been added.
A quantitation limit of 10 gg/1 has been specified.
Limits and monitoring for chromium and nickel have been removed.
Metals monitoring shall coincide with toxicity test monitoring.
Expiration date change to August 31, 2001.
Cyanide Monitoring
Because North Carolina's toxicant standards are based on chronic criteria, the Division will implement the
cyanide limit as a weekly average rather than a daily maximum at the facility's request. However, the strewn
must be protected against both acute and chronic effects. Therefore, a daily maximum limit based on EPA's
acute criterion for cyanide is also included in the permit.
In light of information available regarding cyanide measurement techniques, the Division also feels it is
reasonable to specify the total cyanide quantitation limit as 10 lig/l (10 ppb) in your NPDES permit. Levels
reported as "<10 gg/l" will be considered zero for compliance purposes.
Silver Monitoring
The facility requested removal of the silver monitoring requirement; however, the action level cited in your letter
of October 27, 1998 was incorrect. The action level in North Carolina for silver is 0.06 �Lgll, and past data
indicate there is reasonable potential for the discharge concentration to exceed this level. Therefore silver
monitoring remains unchanged.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

0
Reasonable Potential Analysis
The statistical method used by North Carolina for assessing reasonable potential to exceed a limit differs slightly
from the RPE procedure described in the technical support document referenced in the modification request.
North Carolina's method has been approved by the U.S. EPA, and the Division uses this approach for all facilities
in the State to determine whether or not metals limits are required in permits. Based on this analysis of the data
submitted, the Division is not removing the lead limit from the permit at this time.
General Monitoring Requirements
The facility requested that monitoring requirements for chromium, nickel, lead, mercury and silver be dropped
from the permit. Monitoring for lead remains unchanged since the limit still applies. Monitoring for silver is
unchanged because there is reasonable potential to exceed the action level. The Division also feels that quarterly
monitoring for mercury is not excessive. Monitoring for chromium and nickel, however, was removed because
the facility continues to monitor these parameters as part of the Long Term Monitoring Plan (LTMP).
Monitoring for mercury and silver cannot be discontinued because no data would exist for future reasonable
potential analyses, performed upon each permit renewal. Unless a toxicant is either eliminated as a pollutant of
concern or is included with sufficient frequency in tha LTMP, monitoring must remain in the permit. This permit
has also been modified to specify toxicity monitoring be done in conjunction with metals and cyanide monitoring.
This will assure that future comparison of data with toxicity test results is not erroneous.
Expiration Date
Please note also that this permit modification changes the expiration date for the subject permit to August 31,
2001. The Division is beginning the second five-year cycle of river basin planning and permit renewals. An
examination of the basin planning schedule has revealed that the timing of permit renewals does not allow an
evenly distributed workload as first envisioned. In an effort to improve customer service, and after a review of
the water quality issues in your area, the Division is changing the permit renewal schedule for NPDES permits in
your sub -basin.
Please find enclosed the amended effluent limitations pages for outfall 001 and cover page, both of which should
be inserted into your permit, The old effluent and cover pages should be discarded. All other terms and
conditions contained in the original permit remain unchanged and in full effect. This permit modification is
issued pursuant to the requirements of North Carolina General Statute 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 in the form of a written petition, conforming to Chapter
150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, Post Office
Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such demand is made, this decision shall be final
and binding.
If you have any questions regarding this modification to your permit, please contact Bethany Bolt at (919) 733-
5083, extension 551.
Sincerely,
Original Signed By
R,.,Wil A. VoIr
reston owar' n,r., P.E.
c
Enclosure
cc: NPDES Unit
Central File
Pretreatment Unit
Winston-Salem Regional Office[Water Quality Section

Permit No. NCO02421 0
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215. 1,
other lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act, as
amended,
City of High Point
is hereby authorized to discharge wastewater from a facility located at
High Point Eastside Wastewater Treatment Plant
on Riverdale Drive
east of High Point
Guilford County
to receiving waters designated as Richland Creek in the Cape Fear River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth
in Parts 1. 11, 111, and IV hereof.
This permit shall become effective January 11, 1999.
This permit and authorization to discharge shall expire at midnight on August 31, 200 1.
Signed this day January 11, 1999.
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Envirom-nental Management Commission

A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (page I of 2 effluent pages) ]FU�4 k1t_, Permit No. NCO024210
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial
number 001. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT, CHARACTERISTICS:.-��,
LIMITS
MONITORING REQUIREMENTS
Monthly.:�.
Average
Weekly�
Average -
Daiffy'
Max, In
*mu
keasurement;'::j
Frequency,
Sample
Type
Sample
Location
Flow
16.0 MGD
Continuous
Recording
I or E
BOD, 5 day, 20*C (April 1 - October 3 1)1
8.0 mg/I
12.0 mg/1
Daily
Composite
1, E
BOD, 5 day, 20*C (November I - March 31)1
16.0 mg/I
24.0 mg/1
Daily
Composite
I, E
Total Suspended Solidsi
30.0 mg/I
45.0 mg/1
Daily
Composite
I, E
NH3 as N (April 1 - October 3 1)
3.0 mg/I
Daily
Composite
E
NH3 as N (November 1 - March 3 1)
6.0 mg/1
Daily
Composite
E
VH2
Daily
Grab
E
Dissolved Oxygen3
Daily
Grab
E, Ul D
Fecal Coliform (geometric mean)
400/100ml
Daily
Grab
E, Ut D
Total Residual Chlorine
Daily
Grab
E
Temperature *C
Daily
Grab
E, U9 D
Conductivity
Daily
Grab
E, U9 D
Total Nitrogen (NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
Monthlv
Com2osite
E
Chronic Toxicity4
Quarterly
Composite
E
Cadmium
2.0 gg/I
Weekly
Composite
E
Cyanide5
5.0 Ag/I
22 tig/I
Weekly
Grab
E
Lead
25 pg/I
Weekly
Composite
E, Ut Dt
Copper
2/Month
Composite
E
Iron
2/Month
Composite
E
Mercury
Quarterly
Composite
E
Silver
2/Monffi
omposite
E
Zinc
2/Month
Composite
E
Notes:
Sample locations: E - Effluent, I - Influent, U - Upstream (2 locations): (1) Richland Creek at least 100 feet above outfall, (2) Deep River at NCSR
1113, D - Downstream (2 locations): (1) Deep River at NCSR 1129, (2) Deep River at NCSR 192 1. Stream samples shall be grab samples and shall
be collected 3/Week during June -September and I/Week during the remaining months of the year.
t Upstream and downstream monitoring for lead and nickel shall be conducted monthly by grab sample at the first upstream site U(1) and the first
downstream site D(1).
I The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal).

A (1). LIMITATIONS AND MONITORING REQUEREMENTS (page 2 of 2 effluent pages) V t Permit No. NCO024210
V?jA _'
2 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
3 The daffy average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
4 Chronic Toxicity (Ceriodaphnia) P/F at 90%: January, April, July, and October; see Part III, Condition G. Toxicity monitoring shall, coincide with
metals and cyanide monitoring. *
s The quantitation. limit for cyanide shall be 10 pg/ I (10 ppb). Levels reported as "< 10 pg/ I" shall be considered zero for compliance purposes.
There shall be no discharge offloating solids or uisiblefoam in other than trace amounts.

r"T"U'a
EAST SIDE
NOTES FOR HIGH POINT
MODIFICATION REQUEST (NCO024210)
Summary:
10/27/98 Modification request to set cyanide quantitation limit at 10 �tg/l, as well as
drop limits and/or monitoring for chromium, silver, nickel, mercury and lead. In
addition, facility wishes to have a weekly average for cyanide instead of a daily max.
Basinwide Plan Information:
Facility discharges into Richland Cr, in the Cape Fear River Basin. Richland Cr is
listed as impaired on the 303 (d) list. Problem parameters are fecal, turbidity,
copper, and lindane.
Plan notes that High Point East Side is a contributing source of copper, as well as
the pesticide lindane. (this should be noted at renewal). Nutrients are also
elevated— High point is also a major contributor.
WLA Information:
History notes for 4/14/92 VILA revealed that although the 7Q10 of Richland is 1.0
cfs, limits for metals were intentionally set at standard/action level concentrations.
This was. the result of interacting dischargers contributin to the high
concentration of metals instream (assumed to be the standarls/action leveh).
Essentially, stream has reached its assimilative capacity for Cd, Cr, Pb, Ni, & Zn.
Data Review:
Facili submitted data, as well as the results of RPE "Reasonable Potential to
Excee-Y al is (method used was from EPA support Socument). A reasonable
s
potential anarysis (NC, method) was performed on data submitted, since this is
consistent with DWQ's approach to all NC facilities.
Results
• Analysis of past 60 data points submitted (7/97-6/98) supported that there was no
reasonable potential for chromium to exceed 50 gg/l. Chromium limit may be
dropped.
• Facily considered the action level for silver to be 60 gg/l, instead of 0.06 g�/I. At
least .hree data points since 2/98 were well above that level. Silver monitoring
should remain in permit as is.
• Analysis of data (7/97-6/98) supported that there was no reasonable potential for
nickel to exceed 88 gg/l. Nickel limit may be dropped.
Analysis of data (7/97-6/98) for lead indicated there was in fact reasonable potential
to exceed 25 gg/l. Even if the maximum value for that set (23.52 gg/1) were
omitted as an outlier, the analysis predicted a max. concentration of 26 gg/l, still
warranting a limit. Lead limit and monitoring should remain in permit as is.
As a part of this modification, it should be noted on the effluent page that toxicity
testing should be performed in conjunction with metals monitoring, especially since
this ficility has been identified as a major contributor to those. parameters with action
levels. This is consistent with more recent changes to monitoring requirements at
renewal.
01/08/99

NCO024210 BAB
CN
Finally, a CN quantitation limit of 10 jAg/l is reasonable and also consistent with other
recent permit modifications. Regarding the change of a daily max. limit into a weekly
average— in the past, we have converted the daily max limit into a weekly average and
replaced the daily max limit with either 1/2FAV (Final Acute Value adopted by EPA)
or the weekly average limit X 4, whichever is more stringent. �6 FAV = 22 �tg/l vs.
(5.0 x 4) = 20 gg/l.
Per Dave G., 12/8/98:
Current li is to a
Po icy pp!y only the 1/2 FAV for the daily max, not taking into
account dilution. This is because the criterion is based on acute effects and is
more appropriately applied as the full concentration. Therefore, the limit should
be 22 �ig/l.
Check LTMP. Monitoring for metals w/out limits should only be reduced to
2/Month unless frequent monitoring part of LTMP.
L TMP
Monitoring at discharge is 3 consecutive days per quarter (schedule attached).
Therefore, monitoring for Nickel and Chromium can be dropped from the
NPDES, permit.
Monitoring requirements
We can only �rant a request to eliminate monitoring for the above metals without
limits if there is sufficient monitoring in the Long Term Monitoring Plan (LTPM for
Pretreatment): There would be no way to peiform. reasonable potential analyses
without data in the future, unless the toxicant in question is no longer a pollutant of
concern. Monitoring can be reduced, however, to 2/Month. (Normal practice is to
assi nts without limits of 2/Month for Class III and IV
facrmonitoring f6r toxica,
,ties).
Since there were only 8 data soints for mercu. , and monitoring is alreaqy qnly
. ry
quarterly, I do not recom a reduction in monit ri frequency at this time.
Eight is the absolute minimum amount of points re ired for a reasonable potential
analysis (8-12, at least, are suggested), so I do not tvink this parameter can yet be
eliminated from the NPDES pe"r"m'it.
R qi o n -s Iqpu t
Eric Black of the WSRo concurred with the proposed. modifications. He also
requested I forward information regarding reasonable potential analysis to him.
Expiration date change to August 31, 2001.
01/08/99
2

Ncoo-242 to
Eastside LTMP
G, H. Sawling schedule
SAMPLING SCHEDULE for Eastside
Note: "All 12" does not include oraanics.
Monitoring Initial Thereafter
Point
1 Influent March 15-19 3 consecutive
1993. * days per quarter
la Influent
2 discharge
la Effluent
3 Primary
effluent
4 & 5 raw
sludge
6 Digested
sludge
7 N/A
8 Trickling
Filter
9 Septage
Upereek
Recovery
zone
April
March 15-20
April
March 15-19
March 15-19
April 15-19
March 15-19
Mar. 15, 1993
First 5 loads
See Narrative
See narrative
4 consecutive
days, every
6 months
3 consecutive
days per quarter
4 consecutive
days, every
6 months
As above
Annually
Annually
3 consecutive
days per quarter
1 Per month
4 per month
during summer
4 per month
during summer
POCS
All 12
& PH
Organics**
00,
All 12, VY,
no BOD on
3-20
Organics**
All 12
All but
TSS & BOD
Metals
BOD, COD,
NH3
Metals,
COD, CN
pH
See
narrative
I as above
* Those sampling points marked above are already sampled
on a regular basis. ** Please explain what is needed.
I. Detection level and methods Both shall meet the
criteria in the LTMP model.

Long Term Monitoring Plan
Subject: Long Term Monitoring Plan
Date: Wed, 09 Dec 1998 08:03:12 -0500
From: "Paul Clark" <[e-mail]> Internal
To: [e-mail]
FYI - I read something in the guidance manual that applies to our
discussion yesterday. It appears that influent and effluent monitoring
frequency guidelines are as follows:
- If the headworks is going to be completed within six months and no
previous LTMP data collected (this is uncommon), collect 10 work days
for initial data, then quarterly monitoring on a work day
- Otherwise, monthly monitoring on workday for first year, then
quarterly monitoring on a workday for following years.
Note: the monthly/quarterly requirement was instituted to allow
effluent sampling to coincide wl NPDES monitoring and was considered
less stringent than 3 consecutive days per quarter.
.Thus, my impression is that facilities will be moving away from the
consecutive days to monthly/quarterly. Any questions, please ask.
I of 1 12/14/98 7:50 AM

Reasonable Potential Analysis: High Point -East Side (NCO024210) 03-06-08
RIGH POINT -EAST
Facility Name =
NPDES # =
Q- (MGD) =
7Q10 (cfs)*=
I WC (-/.) =
Chromium
Max. Pred Cw (jig/1)
FINAL RESULTS
NO LIMIT
35
Allowable Cw (pgll)
50
Silver
Max. Pred Cw (jig/1)
ABOVE ACTION LEVEL
I I
Allowable Cw (pg/1)
0.06
Nickel
Max. Pred Cw (pgll)
NO LIMIT
38
Allowable Cw (jagll)
88
Lead
Max. Pred Cw (ligil)
LIMIT
49,
_� Ta�ble Cw (jig/1)
25
*Actually 1.0 efs. but because several dischargers interact
and contribute to high instrewn metals concentrations,
previous models assumed levelsfor these metals were at
water quality standardslaction levels. and therefore limits
should be set at the standards (see history of 1992 WLA).
I examined past 60 points of data, with the exception of
silver, which had three points exceeding the action level of
0.06 VgA in 1998 (action level cited by facility as 60 V&A,
which is inconrect.)
Data points considered outliers ane shaded.
Parameter - Chromium
Standard = 1 50 pg/l
n
BDL=1/2DL
(pg1l)
Actua
Data (ggill
980625
2.50
<5.00
980618
2.30
<5.00
980611
2.50
<5.00
980604
2.30
<5.00
980528
2.50
<5.00
980521
2.50
<5.05
980514
2.50
<5.00
980507
2.56
-<5.00,
980430
2.50
<,5.00
980423
2.50
<5.00
980417
17.43
17.43
980414
2.50
<5.00
980409
2.50
<5.00
980402
2.50
<5.00
980326
2.50
<5.00
980319
2.50
<5.00
980312
2.50
<5.00
980305
2.50
<5.00
980226
2.50
<5.00
980219
2.50
<5.06
980213
2.50
<5.00
980212
2.50
<5.00
980210
2.50
<5.00
980205
2.50
<5.00,
980129
2.50
<5.00
980123
2.50
<5.00
990122
2.50
<5.00
980120
2.50
<5M
980115
2.50
<5.00
980108
2.50
<5.00
971231
2.50
<5.00
971223
2.50
<5.00.
971218
2.50
<5.00
971211
2.50
<5.00
971204
2.50
<5.00
271 1i 2�
2�350
1-00
9�� �01
0
<5.00
9711131
2.50
<5.00
RESULTS
jStd Dev.
1 2.52
IMean
1 2.93
jC.V.
1 0.86
Mult Factor (n=60)
Max. Value 17.4 pg/l
Pyfa_xPred Cw 34.9 itg/l
Allowable Cw 50 Ag/l

Reasonable Potential Analysis: High Point. -East Side (NCO024210) 03-06-08
Chrondu^ cont.
971106
2.50
<5.00
971030
2.50
<5.00
971023
2.50
<5.50
971016
2.50
<5.00
971010
8.67
8.67
971009
2.50
<5.00
971007
2.50
<5.00
971002
2.50
<5.00
970925
2.50
<5.00
970918
2.50
<5.00
970911
2.50
<5.00
970904
2.50
<5.00
970828
2.50
<5.00
970821
2.50
<5.00
980814
2.50
<5.00
970807
2.50
<5.0 0
970731
2.50
<5.00
970724
2.50
<5.50
970718
2.50
<5.00
970717
2.50
<5.00
970715
2.50
<5.50
970710
2.50
<5.00
1
611

Reasonable Potential Analysis: High Point --East Side (NCO024210) 03-06-08
Facility Name =
NPDES # =
Qw (MGD) =
7Q 10 (cfs) =
I WC (V/O) =
HIGH POINT -
EAST SIDE (001)
NCO024210
16.0
0.0
100.00
Parameter = Silver
Standard = 0.06 pg/I (AL)
n
BDL=1/2DL
(Pg/l)
Actual Date
(Rg/1)
980625
2.50
<5.00
980618
2.50
<5.00
980611
2.50
<5.00
980604
2.50
<5.00
980528
2.50
<5.00
980521
2.50
<5.00
980514
2.50
<5.00
980507
2.50
<5.00
980430
2.50
<5.00
980423
2.50
<5.00
980417
3' .85
5.854
980414
2.50
<5.00
980409
2.50
<5.00
980402
2.50
<5.00
980326
2.50
<5.00
980319
5.57
5.57
980312
2.50
<5.00
980305
2.50
<5.00
980226
6
6
20
RESULTS
Std Dev.
1.24
Mean
3.02
C.V.
0.41
Mult Factor (n=19)
Max. Value 6 gg/I
Max. Pred Cw I I Ag/I
Allowable Cw 0.06 pg/l
No need for remaining data points.

Reasonable Potential Analysis: High Point -East Side (NCO024210) 03-06-08
Facility Name =
NPDES # =
Qw (MGD) =
7Q 10 (cfs) =
I WC (0/,) =
HIGH POINT -
EAST SIDE (001)
NCO024210
16.0
0.0
100.00
Parameter = Nickel
Standard = 88 jug/l
n
BDL=1/2DL
(pg/1)
Actual Data
(pg/1)
980625
13.6
13.6
980618
23.75
23.75
980611
5.00
< 10.00
980604
5.00
< 10.00
980528
10.85
980521
<10.00
980514
.5.00
5.00
<10.00
980507
5.00
<10.00
980430
<50.00
980423
5.00
<10.00
980417
14.86
14.86
980414
5.00
<10.00
980409
5.00
<10.00
980402
5.00
<10.00
980326
5.00
<10.00
980319
5.00
<10.00
980312
5.00
<10.00
980305
5.00
<10.00
980226
5.00
< 10.00
980219
5.00
< 10.00
980213
5.00
<10.00
980212
5.00
< 10.00
980210
5.00
< 10.00
980205
5.00
<10.00
980129
5.00
< 10.00
980123
5.00
<10.00
980122
11.23
11.23
980120
5.00
< 10.00
980115
5.00
< 10.00
980108
5.00
<10.00
971231
5.00
<10.00
971223
5.00
<10.00
971218
5.00
<10.00
971211
5.00
<10.00
971204
5.00
<10.00
971126
5.00
<10.00
9711201
5.00
<10.00
9711131
5.001
<10.00
RESULTS
Std Dev.
3.42
Mean
6.04
Cv.
0.517
Mull Factor
(n=59)
Max. Value
23.75 pg/I
Max. Pred Cw
38 pg/I
Allowable Cw
88 pg/I

Reasonable Potential Analysis: High Point -East Side (NCO024210) 03-06-08
Nickel, cont.
971106
5.00
<10.00
971030
5.00
<10.00
971023
5.00
<10.00
971016
5.00
<10.00
971010
5.00
<10.00
971009
5.00
<10.00
971007
5.00
<10.00
971002
5.00
<10.00
970925
5.00
<10.00
970918
5.00
<10.00
970911
5.00
<10.00
970904
5.00
<10.00
970828
5.00
<1 0.00
970821
5.00
< 10.00
980814
5.00
< 10.00
970807
5.00
<10.00
970731
5.00
< 10.00
970724
17.1
17.1
970718
5.00
<10.00
970717
5.00
<10.00
970715
5.00
<10.00
970710,
5.001
<10.001
611

Reasonable Potential Analysis: High Point -East Side (NCO024210) 03-06-08
Facility Name =
NPDES#=
Qw (MGD) =
7Q 10 (cfis) =
I WC (0/0) =
HIGH POINT -
EAST SIDE (001)
NCO024210
16.0
0.0
100.00
Parameter = Lead
Standard = 25,Pg/l
n
BDL=1/2DL
(Ag/1)
Actual Data
(Ag1l)
980625
1.0
<2.0
980618
2.5
2.5
980611
10.44
10.44
980604
5.8
5.8
980528
2.50
<5.00
980521
2.50
<5.00
980514
2.50
<5.00
980507
2.50
<5.00
980430
2.50
<5.00
980423
2.50
<5.00
980417
15.34
15.34
980414
6.166
6.166
980409
2.50
<5.00
980402
2.50
<5.00
980326
2.50
<5.00
980319
7.26
7.26
980312
2.50
<5.00
980305
2.50
<5.00
980226
2.50
<5.00
980219
2.50
<5.00
980213
2.50
<5.00
980212
2.50
<5.00
980210
2.50
<5.00
980205
2.50
<5.00
980129
2.50
<5.00
980123
2.50
<5.00
980122
2.50
<5.00
980120
2.50
<5.00
980115
2.50
<5.00
980108
2.50
<5.00
971231
2.50
<5.00
971223
2.50
<5.00
971218
2.50
<5.00
971211
2.50
<5.00
971204
2.50
<5.00
971126
2.50
<5.00
9711201
2.50
<5.00
9711131
23.52
23.52
RESULTS
Std Dev.
3.4 1
Mean
3.4
C.V.
0.99]
Mult Factor
(n=60)
Max. Value
23.52 pg/1
Max. Pred Cw
49 pg/l
Allowable Cw
25 pg/l
(Even if 23.52 ivere considered ar
outlier, the mult. factor would be
1.7, which predicts a maximum
Lconcentration of 26 mg/l.)

Reasonable Potential Analysis: High Point --East Side (NCO024210) 03-06-08
Lead, cont.
971106
2.50
<5.00
971030
2.50
<5.00
971023
2.50
<5.00
971016
2.50
<5.00
971010
2.50
<5.00
971009
2.50
<5.00
971007
7.19
7.19
971002
2.50
<5.00
970925
2.50
<5.00
970918
2.50
<5.00
970911
2.50
<5.00
970904
2.50
<5.00
970828
2.50
<5.00
970821
2.50
<5.00
980814
2.50
<5.00
970807
2.50
<5.00
970731
2.50
<5.00
970724
2.50
<5.00
970718
2.50
<5.00
970717
2.50
<5.00
970715
2.50
<5.00
9707101
2.501
<5.00
611
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CITY OFHIGH POINT
NORTH CAROLINA
October 27, 1998
146623.PA.TS
Mr. Dave Goodrich
NPDES Permit Group
Division of Water Quality
North Carolina Department of
Enviroment and Natural Resources
P.O. Box 29535
512 N. Salisbury Street
Raleigh, NC 27626-0535
Dear Mr. Goodrich:
Subject Request for Major Permit Modification for Cyanide and Metals Monitoring
City of High Point, Eastside Wastewater Treatment Plant (WWTP)
NPDES Pern-dt NCO024210
Guilford County
The purpose of this letter is to request that a quantitation level for cyanide be added to the
pern-dt immediately as a minor permit modification and to request that permit
limits/monitoring of certain metals where justifiable be removed from the permit. k 0
co
Cyanide
The City of High Point is requesting that a quantitation level of 10 gg/L for cyanide be Z:
included in the NPDES permit for the Eastside WWTP. We understand that the Divisio&f
Water Quality has determined that 10 ug/L is an appropriate quantitation level for cyariWe
for compliance purposes unless specific studies are conducted to develop an alternative=
quantitation level. It is also our understanding that all cyanide values less than this W
quantitation level would be reported and averaged as zero for compliance monitoring
C:)
purposes. This change can be accomplished with a minor pern-tit modification.
The City of High Point also submitted a letter on April 23, 1997, requesting a minor
modification to convert the daily cyanide limit into a weekly average for both the Eastside
PUBLIC SERVICEs DEPARTMENT, P.O. Box 230, High Point, North Carolina 27261
Telephone [phone] FAX [phone] TDD [phone]

Mr. Dave Goodrich
Page 2
October 27,1998
and Westside WWTPs. A check in the amount of $200 was submitted on May 30,1997, for
these minor modifications. The permits have not been modified. Please let us know if we
need to resubmit this request, or if the previously submitted fees could be applied to the
requested minor permit modification.
Metals
Reasonable potential to exceed (RPE) values were calculated for effluent metals
concentrations for the period of July 1, 1995, through June 30, 1998, for the Eastside WVVTP.
The RPE calculation is based on EPA's Technical Support Docunwnt (TSD) for Water Quality -
Based Toxics Control, Table E-1, Daily Maximum Permit Limit Calculation: This table
presents a RPE value calculation procedure if all values in the dataset are above the
detection level and a procedure if the dataset contains values that are below the detection
level. Both procedures were used. RPE values were calculated for the 99thpercentile and
compared against daily maximum permit limits. If the RPE value is less than the permit
limit for a particular metal, then the City of High Point feels that there is no reasonable
potential to exceed the permit limit or action level and requests that monitoring for that
metal be discontinued. The results of the calculation are summarized in Table 1. The
complete data set is presented in Attachment A.
Table I
Eastside WWTP Summary of Metals and Cyanide Data
Data from July 1, 1995 through June 30,1998
(All values pg1l unless noted)
Daily
991,
Monitoring
Standard
Maximum
Percentile
Frequency
Average
Deviation
Maximum
Count
Detections
Limit
RPE
Cadmium
Weekly
0.14
3.39
8.88
126
5
2
4.6
Chromium
Weekly
0.89
7.24
29.09
125
8
50
20.5
Copper
2/month
14.18
9.80
101
123
122
7(a)
37.7
Total Iron
2/month
151.02
500.09
3221
131
52
1000
1263.3
Lead
Weekly
0.79
5.92
23.52
123
10
25
16.6
Nickel
Weekly
3.64
12.52
63
123
22
88
39,5
0 0 6
Silver
2/month
0.89
18.14
57.89
123
8
C60�)
26/8
Zinc
2/month
63.37
33.64
345
133
128
50
167.0
Mercury Quarterly 0 8 0 <0.2
Bold italics denotes a North Carolina action level

Mr. Dave Goodrich
Page 3
October 27,1998
The metals with permit limits greater than the 99thpercentile RPE include:
Chromium
Silver
Nickel
Lead
Therefore, the City of High Point requests that the permit limits and monitoring
requirements for these metals be dropped from the NPDES permit. In addition, mercury
has not been detected in the effluent for the period of July 1, 1995, through June 30, 1998.
Therefore, the City of High Point also requests that mercury monitoring be dropped.
Based on previous discussions with your staff, the addition of a quantitation level is
considered a minor permit modification. However, we understand that removing the
monitoring requirement for some metals would be considered a major modification.
Therefore, we have included a check in the amount of $500 in accordance with 15A NCAC
2H.0105 (b)(5).
We appreciate your consideration of these comments. ff you have any questions, please do
not hesitate to call. me at [phone].
Sincerely,
Thomas P. Gore
Plants Division Manager
City of High Point
c: Ms. Colleen H. Sullins, P.E. - NC DENR/DWQ
Winston-Salem Regional Office
Bill Kreutzberger/CH2M HILL
American Canoe Association

Attachment A
City of High Point Eastside WWTP
RPE Analysis Data

City of Hight Point
Eastside VVWTP
Effluent Data for
RPE Analysis
Total
Cd
Cr
Cu
Fe
Pb
N!
Ag
Zn
CN
Hg
(ugil)
(ug/1)
(ugil)
(ug/1)
(ugil)
(ugil)
(ugil)
(ug/1) (ug/1)
(ug/1)
Average
0.14
0.89
14.18
151.0
0.79
3.64
0.89
63.37
6.03
Stdev
3.39
7.24
9.80
500.1
5.92
12.52
18.14
33.64
8.56
Minimum
1.024
5.4
2.15
94
2.5
10.07
5.37
4
5
Maximum
8.88
29.09
101
3221
23.52
63
57.89
345
40
0
Count
126
125
123
131
123
123
123
133
144
8
Detections
5
8
122
52
10
22
8
128
66
0
7/6/95
<1.0
<5.0
5.54
104
<5.0
<50
<5.0
61
<5.0
7/13/95
<1.0
<5.0
10.21
129
<5.0
34.1
6.88
69
9
7/20/95
<1.0
11.91
14.13
150
<5.0
<50
<5.0
17
15
7/27/95
5
29.09
10.68
115
<5.0
27.8
<5.0
40
14
8/3/95
<1.0
15.85
24.4
295
<5.0
63
<5.0
36
39
8/10/95
<1.0
<5.0
153
<5.0
30.9
<5.0
43
7
8/17/95
<1.0
<5.0
21.09
325
9.54
14.8
15.04
38
40
8/23/95
<5.0
8/24/95
<1.0
<5.0
128
14.9
<5.0
69
16
8/31/95
<1.0
<5.0
25.07
507
9.2
23.1
5.37
<1 0.0
13
9/7/95
>1.0
<5.0
34.45
196
<5.0
<1 0.0
<5.0
74
<5.0
9/14/95
<1.0
<5.0
11.9
182
<5.0
12.4
<5.0
4
10
9/21/95
<1.0
<5.0
9.17
171
<5.0
<10.0
<5.0
50
16
9/28/95
<1.0
<5.0
10.46
161
<5.0
<1 0.0
<5.0
52
21
10/5/95
<1.0
10.34
18.66
675
<5.0
12.6
7.01
119.0
<5.0
10/12/95
<1.0
>5.0
10.24
215
<5.0
<1 0.0
<5.0
102.0
<5.0
10/19/95
<1.0
<5.0
12.28
219
<5.0
11.6
<5.0
85.0
<5.0
10/26/95
<1 .0
<5.0
17.75
187
<5.0
<1 0.0
<5.0
68.0
<6.0
11/1/95
<1.00
<5.00
10.48
157
<5.00
<1 0.0
<5.00
72
<5.0
11/9/95
<1.00
<5.00
9.53
142
<5.00
<1 0.0
<5.00
58
<5.0
11/16/95
<1.00
<5.00
29.74
165
<5.00
<1 0.0
<5.00
91
6
11/22/95
<1.00
<5.00
31.92
137
<5.00
<1 0.0
<5.00
70
<5.0
11/30/95
<1.0
11.95
11.91
126
<5.00
<1 0.0
<5.00
60
<5.0
12/7/95
<1.0
<5.0
15.87
149
<5.00
<1 0.0
<5.0
88.0
<5.0
12/14/95
<1.0
<5.0
12.24
123
<5.0
15.9
<5.0
60.0
<5.0
12/21/95
<1 .0
<5.0
24.51
193
<5.0
<1 0.0
<5.0
34.0
12/28/95
<1 .0
<5.0
9.42
94
<5.0
<1 0.0
<5.0
<10
<5.0
1/7/96
<5.0
2/1/96
<5.0
2/8/96
<5.0
3/7/96
<1.0
<5.0
20.65
438
<5.0
10.32
<5.0
69
5
3/14/96
<1.0
<5.0
9.11
103
<5.0
<1 0.0
<5.0
53
<5.0
3/21/96
<1.0
<5.0
8.9
103
<5.0
<10.0
<5.0
41
<5.0
3/28/96
<1.0
<5.0
<2.0
111
<5.0
<1 0.0
<5.0
52
<5.0
4/3/96
485
70
<5.0
4/11/96
275
91
4/18/96
143
84
4/25/96
847
95
5/2/96
<2.0
<5.0
9.94
63
<5.0
rpedata.xis East 10/30/98 1 of 9

City of Hight Point
Eastside WWTP
Effluent Data for
RPE Analysis
Total
Cd
Cr
Cu
Fe
Pb Ni
Ag
Zn
CN
Hg
(Ug/1)
(Ug/1)
(Ugil)
(Ugil)
(U911) (Ugil)
(Ug/1) (Ug/1) (Ug1l)
(Ug/1)
5/9/96
<2.0
<5.0
14.92
71
<5.0
5/16/96
<5.0
<0.2
7/3/96
154
345
<5.0
7/12/96
148
118
7/18/96
112
65
7125/96
141
31
8/2/96
<5.0
10/4/96
<5.0
10/10/96
<5.0
12/5/96
<1.00
<5.00
19.66
152
<5.00 <10.0
<5.00
148
<0.2
12/12/96
<1.00
<5.00
14.3
131
<5.00 <10.0
<5.00
75
<5.0
12/15/96
<1.00
<0.2
12/16/96
7
12/19/96
<1.00
<5.00
14.26
196
<5.00 <1 0.0
<5.00
67
12/26/96
<1.00
<5.00
18.5
160
<5.00 <1 0.0
<5.00
84
<5.0
1/2/97
<1.00
<5.00
12.24
<500
<5.00 <10.00
<5.0
50
<5.0
1/7/97
<1.00
<5.00
20.9
<500
<5.00 30.95
<5.0
73
1/9/97
<1.00
<5.00
16.64
<500
<5.00 <1 0.00
<5.0
65
1/10/97
<1.00
<5.00
13.74
<500
<5.00 <10.00
<5.0
53
10.5
1/15/97
17
1/16/97
<1.00
<5.00
14.78
<500
<5.00 <10.00
<5.0
58
1/17/97
9.5
1/23/97
<1.00
5.4
13.36
<500
<5.00 10.85
<5.0
85
1/24/97
5
1/30/97
<1.00
<5.00
12.08
<500
<5.00 <1 0.00
<5.0
82
1/31/97
11.5
2/6/97
<1.00
<5.00
13.9
<500
<5.00 <10.00
<5.00
62
2M97
12
2/13/97
<1.00
<5.00
14.12
<500
<5.00 <10.00
<5.00
63
2/14197
<5.0
2/20/97
<1.00
<5.00
12.51
<500
<5.00 <10.00
<5.00
42
2/21/97
5
2/27/97
8.88
<5.00
11.7
<500
<5.00 32.57
<5.00
56
2/28/97
7.5
3/6/97
<1.00
<5.00
12.94
576
<5.00 <10.00
<5.00
65
3/7/97
13
3/13/97
<1.00
<5.00
8.67
<500
<5.00 <10.00
<5.00
71
3/14/97
6.5
3120/97
<1.00
<5.00
8.53
<500
<5.00 <10.00
<5.00
63
3/21/97
16
3/27/97
<1.00
<5.00
7.88
<500
<5.00 <10.00
<5.00
87
3/28/97
18
4/3/97
<1.00
<5.00
9.89
<500
<5.00 <10.00
<5.00
48
<0.2
4/4/97
25
4/10/97
<1.00
<5.00
8.89
<500
<5.00 <1 0.00
<5.00
63
4/11/97
6
rpedata.xis East 10/30/98 2 of 9

City of Hight Point
Eastside WWTP
Effluent Data for
RPE Analysis
Total
Cd
Cr
Cu
Fe
Pb NI
Ag
Zn
CN Hg
(Ugil)
(Ugil)
(Ug1l)
(Ug1l)
(Ug1l) (UgIQ
(Ug1l) (Ugil) (Ug1l) (Ug/1)
4/17/97
<1.00
<5.00
9.1
<500
<5.00 <10.00
<5.00
77
4/18/97
<5.0
4/24197
<1.00
<5.00
9.89
<500
<5.00 <10.00
<5.00
43
4/25/97
19.5
4/30/97
14
5/1/97
<1.00
<5.00
13.67
949
<5.00 <10.00
<5.00
36
11
5/2/97
28
5/7/97
8
5/8/97
<1.00
<5.00
10.28
<500
<5.00 <10.00
<5.00
81
14
5/9/97
8.5
5/14/97
<5.0
5/15/97
<1.00
<5.00
9.62
<500
<5.00 <10.00
<5.00
89
8
5/16/97
13
5/21/97
<5.0
5/22/97
<1.00
<5.00
9.06
<500
<5.00 <10.00
<5.00
76
<5.0
5/28/97
13
5/29/97
<1.00
<5.00
4
<500
<5.00 <10.00
<5.00
47
32
5/30/97
36
6/4197
9
6/5/97
<1.00
<5.00
7.59
<500
<5.00 <10.00
<5.00
69
15
6/6/97
<5.0
6/11/97
6
6/12/97
<1.00
<5.00
8.7
<500
<5.00 10.07
<5.00
65
11
6/13/97
8
6/18/97
7
6/19/97
18
6/20/97
<1.00
<5.00
9
<500
<5.00 <10.00
<5.00
65
7.5
6/25/97
<5.0
6/26/97
<1.00
<5.00
8.31
<500
<5.00 <10.00
<5.00
98
14
6/27/97
5
7/2/97
<1.00
<5.00
7.14
<500
<5.00 <10.00
<5.00
48
31
7/3/97
<5.0 <0.2
7/4/97
5.5
7/9/97
<5.0
7/10/97
<1.00
<5.00
9.64
<500
<5.00 <10.00
<5.00
64
5
7/11/97
5
7/15/97
<1.00
<5.00
10.82
<500
<5.00 <1 0.00
<5.00
143
7/17/97
<1.00
<5.00
14.81
<500
<5.00 <1 0.00
<5.00
55
7/18/97
<1.00
<5.00
2.15
<500
<5.00 <1 0.00
57.89
<25
<5.0
7/24/97
<1.00
<5.00
9.96
<500
<5.00 17.1
<5.00
47
<5.0
7/31/97
<1.00
<5.00
12.75
<500
<5.00 <10.00
<5.00
60
<5.0
8/7/97
<1.00
<5.00
10.22
<500
<5.00 <10-00
<5.00
<25
5
8/14/97
<1.00
<5.00
10.45
<500
<5.00 <10-00
<5.00
45
7
8/21/97
<1.00
<5.00
10.15
<500
<5.00 <10.00
<5.00
<25
<5.0
8/28/97
<1.00
<5.00
18.58
<500
<5.00 <1 0.00
<5.00
27
<5.0
9/4/97
<1.00
<5.00
11.12
<500
<5.00 <1 0.00
<5.00
44
<5.0
rpedata.xIs East 10/30/98 3 of 9

City of Hight Point
Eastside WWTP
Effluent Data for
RPE Analysis
Total
Cd
Cr
Cu
Fe
Pb NI
Ag
Zn
CN
Hg
WWI)
(Ug")
NO)
(Ug/1)
(Ug/1) (Ug/1)
(Ug/1) (Ug1l) (Ug1l)
(Ug/1)
9/11/97
<1.00
<5.00
12.82
<500
<5.00 <10.00
<5.00
26
<5.0
9/18/97
<1.00
<5.00
12.74
<500
<5.00 <1 0.00
<5.00
64
<5.0
9/25197
<1.00
<5.00
14.1
<500
<5.00 <10.00
<5.00
38
<5.0
10/2/97
<1.00
<5.00
17.67
<500
<5.00 <10.00
<5.00
52
<5.0
10/7/97
<1.00
<5.00
13.44
<500
7.1,9 <10.00
<5.00
65
10/9/97
<1.00
<5.00
14.55
<500
<5.00 <10.00
<5.00
52
6
<0.2
10/10/97
<1.00
8.67
16.04
<500
<5.00 <1 0.00
<5.00
45
10/16/97
<1.00
<5.00
18.04
<500
<5.00 <10.00
<5.00
55
<5.0
10/23/97
<1.00
<5.00
16.98
<500
<5.00 <10.00
<5.00
58
<5.0
10/30/97
<1.00
<5.00
19.2
<500
<5.00 <10.00
<5.00
49
<5.0
11/6/97
<1.00
<5.00
14.36
<500
<5.00 <1 0.00
<5.00
57
<5.0
11/13/97
<1.00
<5.00
26.82
<500
23.52 <1 0.00
<5.00
54
<5.0
11/20/97
<1.00
<5.00
19.4
<500
<5.00 <1 0.00
<5.00
77
<5.0
11/26/97
<1.00
<5.00
12.56
<500
<5.00 <1 0.00
<5.00
60
<5.0
12/4/97
<1.00
<5.00
10.91
<500
<5.00 <1 0.00
<5.00
66
9.5
12/11/97
<1.00
<5.00
11.3
<500
<5.00 <1 0.00
<5.00
62
<5.0
12/18/97
<1.00
<5.00
12.54
<500
<5.00 <10.00
<5.00
65
<5.0
12/23/97
<1.00
<5.00
12.05
<500
<5.00 <1 0.00
<5.00
66
<5.0
12/31/97
<1.00
<5.00
4.49
<500
<5.00 <10-00
<5.00
49
<5.0
1/8/98
<1.00
<5.00
17.41
1057
<5.00 <1 0.00
<5.00
58
8
<0.2
1/15/98
<1.00
<5.00
14.06
<500
<5.00 <1 0.00
<5.00
61
<5.0
1/20/98
1.41
<5.00
3.75
<500
<5.00 <10-00
<5.00
70
1/22/98
<1.00
<5.00
17.57
<500
<5.00 11.23
<5.00
76
<5.0
1/23/98
<1.00
<5.00
26.12
917
<5.00 <10.00
<5.00
66
1/29/98
<1.00
<5.00
15.39
563
<5.00 <10.00
<5.00
57
13.5
215/98
<1.00
<5.00
26.29
855
<5.00 <10.00
<5.00
72
<5.0
2/10/98
<1.00
<5.00
10.56
<500
<5.00 <10.00
<5.00
53
2/12/98
<1.00
<5.00
12.28
<500
<5.00 <10.00
<5.00
72
7
2/13/98
<1.00
<5.00
11.23
<500
<5.00 <10.00
<5.00
63
2/19/98
<1.00
<5.00
13.71
<500
<5.00 <10.00
<5.00
63
9
2/26/98
<1.00
<5.00
11.96
<500
<5.00 <10.00
6
30
<5.0
3/5/98
<1.00
<5.00
15.83
<500
<5.00 <10-00
<5.00
87
9
3/12/98
<1.00
<5.00
9.77
<500
<5.00 <1 0.00
<5.00
77
<5.0
3/19/98
<1.00
<5.00
28.78
1268
7.26 <10.00
5.57
68
<5.0
3/26/98
<1.00
<5.00
10.52
<500
<5.00 <1 0.00
<5.00
57
<5.0
4/2/98
1.024
<5.00
5.655
<500
<5.00 <1 0.00
<5.00
61
<5.0
4/9/98
<1.00
<5.00
7.483
<500
<5.00 <1 0.00
<5.00
78
<5.0
4/14/98
<1.00
<5.00
10
<500
6.166 <1 0.00
<5.00
99
4/16/98
<5.0
4/17/98
1.406
17.43
101
3221
15.34 14.86
5.854
155
4/23/98
<1.00
<5.00
9.385
576
<5.00 <10-00
<5.00
43
<0.2
4/24/98
18
4/30/98
<1.00
<5.00
7.388
<500
<5.00 <50.00
<5.00
56
<5.0
5M98
<1.00
<5.00
18.27
904
<5.00 <1 0.00
<5.00
74
13
5/14/98
<1.00
<5.00
7.831
<500
<5.00 <1 0.00
<5.00
34
<5.0
5/21/98
<1.00
<5.00
19.18
<500
<5.00 <10.00
<5.00
45
<5.0
rpedata.xIs East 10/30/98 4 of 9

City of Hight Point
Eastside VVWTP
Effluent Data for RPE Analysis
Total
Cd
Cr
Cu
Fe
Pb Ni Ag Zn
(Ug/1)
(Ug/1)
(Ugh)
(Ug/1)
(Ug/1) (Ug/1) (Ugil) (Ug1l)
5/28/98
<1.00
<5.00
12.78
<500
<5.00 10.85 <5.00 50
6/4/98
<1.00
<5.00
13.99
<500
5.8 <1 0.00 <5.00 49
6/11/98
<1.00
<5.00
20.97
<500
10.44 <1 0.00 <5.00 39
6/18/98
<1.00
<5.00
10.81
<500
2.5 23.75 <5.00 48
6/25/98
<1.00
<5.00
12.49
<500
<2.0 13.6 <5.00 60
CN Hg
(Ug1l) (Ug/1)
<5.0
31
<5.0
<5.0
<5.0
rpedata.xis East 10/30/98 5 of 9