NC0047597_Wasteload Allocation_19850927

State of North Carolina
Department of Natural Resources and Community Development
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor R. Paul Wilms
S. Thomas Rhodes, Secretary Director
September 27, 1985
A. T. Rolan, Director
Durham Dept. of Water Resources
101 City Hall Plaza
Durham, N.C. 27701
Dear Mr. Rolan,
The winter limits for the Farrington Road Wastewater Treatment Plant
(WWTP) have been re-evaluated by our water quality staff. The attached
report describes this review. We have concluded that the summer limits
of BOD = 7 mg/1, NH = 2 mg/1, DO 5 mg/1 should apply year-round.
The andlysis indicated that the limits may not be restrictive enough
to assure water quality protection. However, our model needs to be field
verified, so no changes in the BOD and NH limits will be made until a
field study is peformed. We anticipate thdt the field study will take
place ne ; fall- after _ thae w lii7z fe sub iris:o v- rat bel r 'tie - Affi sgtsun
Complete effluent limitations for the Farrington Road WWTP's permit
renewal were developed during our review of the winter limits. Monitoring
data collected at the Farrington Road plant indicates that discharges of
mercury and cyanide are violating our water quality standards for Class
"C" waters. Limits will be established to assure water quality protection
under 7Q10 conditions. Furthermore, a 1 mg/1 total phosphorus limit will
also be included. This limit is required by the NSW classification of
Jordan Lake and its tributaries.
As you know, efforts are being made to address the acute toxicity
of the Farrington Road WWTP's waste. Since discharges of zinc from this
facility are in violation of our action level for zinc in Class "C"
waters, we will include a review of zinc in our study.
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

A. T. Rolan, Director
September 27, 1985
- page two -
A final wasteload allocation will be developed for this facility
after completion of our toxicity evaluation. However, feel free to call
Meg Kerr (733-5083) or me with questions about these proposed limits.
cc:
Paul Wilms
Meg Kerr
Steve Tedder
Dave Adkins
Dennis Ramsey
Srely,
1,
Georgeverett, Chief
Water uuality Section

Justification for Effluent Limits Less Than 10 & 4
Discharger Name:
Suggested limits
Waste flow (mgd) :
Receiving Stream:
7Q10: O. /
rQ R re i n 9 -76-1 Pt() w (A W
BOD " NH : 02 6 DO: , ' J
5-
3
AJru, haw Cri L.dk e
DO minimum at assigned
limits:
DO minimum at 10 BOD5, 4 NH3:
DO min. at 15 BOD5, 4 NH3:
(if 7Q10 = 0 cf s )
Avg:
9!0 y/f
/3a "te
1 W/4
6 5g (fe,
it.) J67 dapn Zah_
PIA
Schematic diagram of discharge and Receiving Stream: (Show flow sites,
location of interacting dischargers and approximate
Flo w s CEP l--
USG-5 # O2.04 3 3.1'/o0 (1480
Surti,ni e✓
3Q1O- O.i
33
location of DO minimum).
11.6721
61,LIA
rebe.2 ' t /or, (D W7P
rnaD
j./ca, said-- /Loco
k n a 1 j>7%--D akr1/4A9
yru v.e //,-ni L.
00n1?5-
c.7'' .Je/A cam

4
The water quality policy, "Maximum Treatment Requirements for Wasteload
Allocations for Dischargers of Domestic Wastewater" signed by the Director of
the Division of Environmental Management on August 31, 1984, allows effluent
limits more restrictive than 10 and 4 for the following cases:
1.,
2.
3.
Dischargers to
Dischargers to
waters
Large proposed
to have severe
flowing streams
zero flow streams which impact downstream flowing
dischargers to zero flow streams which are predicted
impacts on water quality (cases where no discharge
is not an alternative).
In all three of these cases, strict effluent limits are required to
protect the aquatic habitat. Flowing streams support viable fish and
insect populations which can be stressed and damaged by violations of the
dissolved oxygen water quality standard. The steady - state Streeter
Phelps Level B model used by the Technical Support Group to simulate
dissolved oxygen reactions in flowing streams can reliably predict conditions
in these systems. When limits of 10 mg/1 BOD5, 4 mg/1 NH3 are simulated by
the model, low dissolved oxygen concentrations are predicted. These concen-
trations can be expected to damage the aquatic ecosystem.

DIVISION OF ENVIRONMENTAL MANAGEMENT
September 19, 1985
MEMORANDUM
TO: Steve Tedder
Dennis Ramsey
FROM: Meg Kerr
SUBJECT: Farrington Road WWTP
I have received two requests from the City of Durham to re-evaluate
winter limits for the Farrington Road WWTP. Since the permit expires in
February 1986, I took the opportunity to review all effluent limitations
for the facility. The attached report summarizes my findings.
Please review the report and return with comments. I will send
Terry Rolan a copy with your approval.
MK:mlt
Attachment

1
EFFLUENT LIMITATIONS FOR FARRINGTON ROAD WWTP
I. Introduction
The Farrington Road WWTP discharges to New Hope Creek 4.5 miles
upstream of Jordan Lake. The plant's design flow is 10.0 mgd and the
current permit has winter and summer limitations of:
BOD5 = 7 mg/1
NH3 = 2 mg/1
DO = 5 mg/1
TSS = 30 mg/1
fecal coliform = 1000/100 ml
pH = 6-9 SU
The limits were originally based on a Level C model calibrated
to data collected in August, September and October 1973. Conditions
in the watershed have changed substantially since 1973, so the present
analysis was performed using DEM's standard desktop modeling procedures.
I1. Desciption of Model
The attached appendix describes the Division's desktop modeling
procedure. Details specific to the Farrington facility are described
below:
Qw
10.0 mgd
Slope = 3.6 ft/m
l
reek
:w dope
USGS #
02.0973.1400 1980
eS
ti S7Q 10 = 0.1 cfs
o,• W7Q10 = 1.0 cfs
DA = 76.0 sq mi
QA = 78.0 cfs

The schematic shows the system evaluated with the model. The
distance from Farrington WWTP to Jordan Lake was measured to be 4.5
miles. The slope is at most 3.6 ft/mile (old measurements- attached
graph shows 3.14 ft/mile). The higher slope was used in the model.
The USGS estimated 7Q10 (summer) at Farrington WWTP is 0.1 cfs,
the winter 7Q10 is 1.0 cfs. The drainage area is 76 sq mi and the
average flow is 78 cfs.
The elevation of the discharge is 235 ft above MSL, resulting
in a design temperature for the summer of 26°C and 16°C for the winter.
Background conditions were assumed good with DO 90% saturated and BOD
ultimate concentrations very low (2 mg/1). Runoff was added along
New Hope Creek with 0.05 cfs/mile added under 7Q10 and 1.0 cfs/mile
added for average flows.
Calculated parameters (methods described in attached method)
were used for Reach #1. The Lake reach was modeled as a slow moving
stream with an advective velocity of 0.01 fps. All other rates were
predicted by the empirical equations.
Modeling results
The summer model showed that only 9 mg/1 of ultimate BOD could
be discharged (limits of BOD5 = 5, NH3 = 1) at an effluent Do of 5
mg/1 and still protect the D0 in the upper reaches of Jordan. In the
winter, 14 mg/1 BOD ultimate (BOD5 = 6, NH3 = 2) can be discharged at 5
mg/1 effluent D0.
These restrictive limits are needed to protect the D0 in the
upper arm of Jordan Lake. The assumed (probably quite realistic)
slow velocity traps BOD in the initial segment where its D0 demand
is exerted.

III. Additional Considerations
1. Wildlife subimpoundments
The Corps of Engineers is in the process of constructing sub -
impoundments on several arms of Jordan Lake. According to John Young
with the Corps office in Durham, one impoundment will be directly
below the Farrington WWTP discharge. These impoundments will be
operated by the NC Wildlife Resources Commission for water fowl
propagation. The operation of the impoundments has not been finally
determined, according to Don Baker. It is expected that the impound-
ments will be filled in the fall to a depth of 5- 10 feet at the dam
which will create a shallow, marshy pool. The water will be released
in the spring before trees begin to bud out. The waste discharge will
be a major inflow to the subimpoundment. The velocity of the waste
through the impoundment will probably be considerably slower than the
velocity predicted with our model. This could decrease the allowable
BOD loading from the plant.
2. Toxicity
The Farrington WWTP waste is acutely toxic according to DEM
screening tests and self -monitoring performed by the city. Efforts
are underway to address this problem.
Self -monitoring data indicate that Hg, CN, and Zn are consis-
tently above limits needed to protect water quality under 7Q10.
Table 1 summarizes measured metals concentrations and compares
these concentrations to limits based on water quality protection.
3. Phosphorus
As an existing facility in the New Hope Arm of Jordan Lake, the
Farrington WWTP is required to develop a schedule to meet 1 mg/1
Total P. Self -monitoring records (average 2/85 - 7/85) show that
the plant discharges 5.1 mg/1 total P.

Metal
Table 1
Metals in Farrington WWTP Discharge
Effluent concentration
Avg. Conc. * that will protect WQ
CN 0.1 mg/1
Hg 1.7 ug/1
Zn 83 ug/1
Cu <50 ug/1
Cr <50 ug/1
Ni <100 ug/1
Cd <50 .ug/1
Pb <100 ug/1
**
* Average of self -monitoring data 2/85 - 7/85
** Can not determine if WQ violations are occurring
0.005 mg/1
0.2 ug/1
50 ug/1 (AL)
15.1 ug/1
50.3 ug/1
50.3 ug/1
2.01 ug/1
25.2 ug/1

IV. Recommendations
Questions about appropriate eflfuent limitations for the Farrington
Road facility can not be adequately resolved without a complete field
study. The effects of the wildlife subimpoundments may not be measurable
for several years. I recommend, therefore, that we reissue the Farrington
Road permit with the existing BOD and NH3 limits, but include a reopener
to allow changes after completion of a field study. Limits for CN and
Hg should also be included. The facility should be required to monitor
other metals at detection levels that will allow evaluation of standards
violations. A total P limit should also be included.

Moddigi 9/Lizufzu,
�t� r (80i) /''1 in o C6C,
1. i Sv/)-rr e
4,5
lam r��oc
O, O l i-s
--// 1/_.ci o .5
O 4- 0-0 z /, O
liU on gvc
0 /Ur-- /t4t" /-"lj
121 / o-c DID AGO)/y
4 5 o_/. 5 c 5

.... ........ ........ .................... MODEL RESULTS ---
�Ep DUAHAM FAAAINCTON QD
lNC STREAM NEW HOPW CREEK
END D.O. IS 8.20 MC/L
-------------------------
aE END CBOD IS 0.00 MC/L
---------------------------
THE END NBOD IS 0.00 MG/L
THE D.O. MIN OF SEGMENT 1 IS 5.02 MG/1
THIS MINIMUM IS LOCATED AT SEGMENT MILEPOINT 0.00
WHICH IS LOCATED IN PEACH NUMBER 1
THE WLA FOR SEGMENT 1 REACH 1 IS 9 MC/L OF CBOD
THE WLA FOP SEGMENT I REACH 1 IS O MC/L OF NBOD
THE AEQUIPED EFFLUENT D.O. IS 5 nC/L
THE WASTEFLOW ENTERING SEC 1 PEACH 1 IS 10 MCD
THE WLA FOR SEGMENT 1 REACH 2 15 O MC/L OF CBOD
THE WLA FOR SEGMENT 1 REACH 2 IS 0 MC/L OF NBOD
THE REQUIRED EFFLUENT D.O. JE 0 MC/L
THE WASTEFLOW ENTERING SEC 1 PEACH 2 IS O MCD

DISCHAACEA
�
:DUAHAM FAAAINCTON AD
AE `VINC STQEAM :NEW HOPW CAEEK
WASTEFLOW
5EC NO PEACH SEC MI | DO CBOD | NeOn | FI ...ow
1 1 0.0011 5.021, 8.961, 0.0011 15.60
1 A. 0.1011 5.03| 8.8*7| 0.0011 15.61
J. 1 0.If.'201. 5.0511 8.78 It 0.00| 15.61
1 1 0.30\ 5.07\ S.69| 0.0011 15.82
1 1 0.^1() , 5.091, 8.60| 0.0011 15.62
1 1 0.50| 5.10| 8.52. 0.00| 15.63
1 J. 0.601 5.121 8.x181, 0.0011 15.63
1 1 0.70| 5.14| 8.35| 0.00| 15.6^1
1 1 V.GU| 5.16| 8.270.001, 15.6^x
J. 1 0.90| 5.181, G.18| 0.0011 15.65
J. J. 1.00| 5.201 8.10| 0.00| 15.65
1 1 1.10| 5.221, 8.021, 0.0011 15.66
1 1 1..2011 5.24| 7.94| 0.0011 15.66
1 1 1.301. 5.26| 7.0611 0.0011 15.67
1 1 1.A0} 5.2811 7.7911 0.001, 15.67
J. 1 1.5V| 5.IS0| 7.711, 0.0011 15.6G
1 1 1.601, 5.321, 7.631 0.00| 15.68
J. J. 1.70| 5.S.el| 7.561, 0.0011 15.69
1 1 | 1.80| 5.36| 7.4Q11 0.0011 15.69
1 1 1.901 5.38| 7.411, 0.001. 15.70
1 1 2.00| rj.40| 7.331, 0.00| 15.70
J. 1 2.101 5.-e1211 7.261, 0.001, 15.71
1 1 12.2011 5.441 7.1910 0.001. 15.71
1 1 2.301, 5.Z161, 7.1211 0.00| 15.72
1 1 2.`1011 5.481, 7.051 0.0011 15.7a
J. 1 2.501, 5.50" 6.9 81, 0.0011 15.73
J. J. | 2.601, 5.52| 6.911, 0.0018 15.73
J. 1 2.7011 5.5All 6.EV1| 0.0011 15.7-el
1 J. 2.801, 5.5611 6.771 0.00| 15.^1
J. 1 2.903' 5.5811 6.701, 0.0011 15.75
1 1 3.0V5.601, 6.6^q| 0.001, 15.T5
J. 1 3.10| 5.621, 6.571, 0.00| 15.76
1 1 3.201, 5.64| 6.1`501 0.001, 15.76
1 1 3.30| 5.6*71 6.ZIA| 0.001, 15.77
1 1 3.^q01, 5.6911 6.3-81, 0.00| 15.77
1 1 3.5011 5.71( 8.3111 0.00| 15.78
1 1 3.60| 5.7311 6.25| 0.00| 15.7S
1 1 3.7011 5.751, 6.19| 0.00| 15.79
1 1 3.80| 5.771 6.131, 0.0011 15.79
1 1 3.901, 5.791, 8.071, 0.0011 15.80
1 1 4.00| 5.811 6.011, 0.001, 15.80
1 1 4.10| 5.83| 5.951, 0.0011 15.81
1 1 `1.20} 5.85. 5.891, 0.0010 :1.5.81
1 1 4.3011 5.871, 5.831, 0.0011 15.82
1 1 A. AO, 5.E-3911 5.771. 0.0011 15.82
1 1 4.50| 5.901, 5.7'11, 0.0011 15.B3
1 2 4.501, 5.9011 5.'711, 0.0011 15.83
J. 2 ^4.601, 5.261, 4.3111 0.00| 15.B3
1 2 4.7011 5.0711 3.25| 0.0011 15.84
J. 2 4.8V| 5.161, 2.`1511 0.001 15.E-3^1
1 2 4.9011 5.3911 1.851, 0.0011 15.85
1 2 5.0U| 5.701, 1.4011 0.Oo\ 15.85
1 2 5.1011 6.02's 1.0511 0.0011 15.88
J. 2 5.20| 6.8VI1 0.7911 0.001, 15.86
1 8 5.1') 0 i 6.631, 0.601 0.00| 15.87
J. 2 5.401, 6.891, 0.451, 0.0010 15.G7
12 5.50| 7.121, 0.84| 0.00 11 15.86
1 2 5.6011 7.911, 0.281 0.00| 15.88
1 2 5.70| 7.48| 0.20 11 0.m0| 15.89
1 2 5.801, 7.62| 0.151, 0.0011 15.89
'. -.. ~ ... " "°. ^M "°

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7.821
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8.011
8.051
8.081
8.101
8.121
8.141
8.151
8.161
8.171
6.181
8.181
8.181
8.191
8.191
8.191
8.191
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8.201
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O .061
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16.02
16.08

** MODEL SUMMARY DATA ***
DISCHARGER t SUBBASIM i
. RECEIVING STREAM t STREAM CLASS:
701.0 CFS WINTER 7010 °. CFS
DESIGN TEMPERATURE 1 16 DEGREES C, WASTEFL OW MOIL
I LENGTH 1 SLOF'E 1 VELOCITY !DEPTH I K1 1 K1 1 K2 ! K2 I Kri 1
!MILES I FT/MI 1 FPS 1 FT 1 /DAY 1 (rf20 I /DAY 1 P20 I /T►AY 1
I I 1 1 1 1 1 1 1 1
SEGMENT 1 I 4.50 1 3.601 0.319 1 1.86 1 0.31 1 0.37 I 1.37 I 1.49 1 0.001
REACH 1 I 1 1 1 1 1 1 1 1 1
1 I 1 1 1 1 I 1 I 1
SEGMENT 1 1 4.00 1 0.001 0.010 1 10.56 I 0.29 1 0.35 I 0.29 1 0.32 1 0.001
REACH 2 1 1 1 1 1 1 1 1 ! 1
*** INPUT DATA SUMMARY ***
FLOW 1 CBOD 1 NBOD 1 D. O.
CFS 1 MC/L 1 MG/L 1 MG/L
SEGMENT :L REACH 1
WASTE
HEADWATERS
TRIBUTARY
RUNOFF
15+500 1 14.000
1.000 2.000
0.000 1 0.000
0.050 1 2.000
SEGMENT 1 REACH 2 1
WASTE 1.
TRIBUTARY 1
RUNOFF * I
0. 0'.©0 1.• .0.0 0 0
0.00o' 1 0+000
.0.000 1 0.000
0,000
0.000
0.000
jj
0 . 0 0 0
5.000
��
8.8%0
0.000
8.870
0.000
0.000
0.000
0.000
0.000
0.0,00
•
•
RUNOFF FLOW IS IN CFS/MILE
********** MODEL RESULTS **********
DISCHARGER
RECEIVING STREAM

/Gthil---
iti/bel /Iaf 21/tte al4G

*********************************************: ***:fc* ****:f4*•**: ***..t****
THE END D.O. IS 9.80 MG/I_.
** ********************* :*#:**::******************************************
THE E:ND CBOD IS 0,01. MG/L
:**)K*********:***********:*************************************)K********
THE END NBOD IS 0.00 MG/L
**********************************:****************************fit*******
THE D.0+ MIN. OF SEGMENT 1 IS 4.82 MG/L
THIS MINIMUM IS LOCATED AT SEGMENT MILEF`OINT 4.9
WHICH IS LOCATED IN REACH NUMBER 2
THE WLA FOR SEGMENT :1 REACH 1 IS :14 MG/L OF CBOL'
THE WLA FOR SEGMENT 1 REACH 1. IS 0 MG/L OF NBOD
THE REQUIRED EFFLUENT D.O. IS 5 MG/L
THE WASTEFLOW ENTERING SEG 1. REACH 1. IS 10 MGD
THE WLA FOR SEGMENT 1. REACH 2 IS 0 MO/L OF CBOD
THE WLA FOR SEGMENT 1 REACH 2 IS 0 MG/1_. OF NBOD
THE REQUIRED EFFLUENT D+0+ IS 0 MG/L
THE WASTEFLOW ENTERING SEG 1 REACH 2 IS 0 MGD
**********************************************************************
DISCHARGER }
RECEIVING STREAM
WASTEFLOW
1 SEG NO 1 REACH 1 SEG MI 1 LSO 1 CBOD 1 NROD 1 HOW 1
1 1 1 1 0+001 5.231 1. 3+ 27 1 0.001 16.501
1 I 1 1 1 0.101 I.281 13.:1 9 1 0+001 1 6.5 1. 1
1 1 1. 1 0.201 5.321 .17..f 1 1 0.001 .I6.511
1 1 1 1 0.301 5+361 13+031 0+001 16. ' 1
1 1 1 1 0+401 5+401 12.951 0.001 16+521
1 1 1. 1 0.501 5.451 12.871 0.001 1 6+ 53 1
1 1 :f. 1 0+601 5.491 12.791 0+001 16.531
I 1 1 1. 1 0.701 5.531 1 2. 71 1 0.001 1 6+ 54 1
1 1 1 1 1 0+801 5.561 1 2+63 1 0.001 16.541
1 1 1 1 1 0 +90 1 5+601 12 +55 1 0.001 16.551
1 1. 1 :1. 1 1 +00 1 5+641 12.4S1 0.001 16.551
1 1 1 1 1+101 5,b81 :12+401 0.001 :16.561
I 1 1 1 1 1.201 5. 72 1 12.321 0.001 1 6+ 6 1
I 1 1 1 1 1.301 5.751 12+251 0.001 .16+571
I 1 1 1 1 1+ 40 1 5.791 1. 2. 1.7 1 0.001 16.571
I 1 1 1 1 1 +50 1 5.821 :1 ?. 1,0 1 0.001 16,581
:l 1 1 1 1+ 60 1 5+ 86 1 1 2+ 02 1 0.001 16 .581
I 1 1 1 1.701 5.891 1 1. 95 1 0+001 16.591
I 1 1 1 1 1+ 80 1 5.931 1. 1+ 88 1 0.001 16.591
f 1 1 1 1 1.901 5.961 1 1+ 8 +0 1 0+001 16.601
1 1 1 1 1 2.001 5.991 1. 1 .7«} 1 0+00 1 16.601
1 1 1 1 1 '+1.01 6.021 11.661 0+001 1.6.611
1 1 1 1 2.201 6.061 1.1 .591 0.001 :1 6.61 1
f :1. 1 1 1 2.301 6.091 11.521 0.001 16,621
1. 1 1 1 2.401 6.121 1 1. 4 4 1 0+001 16.621
1 :1. 1 I 1 2.501 6 .. 1. 5 1 1.1. + 37 1 0+001 16.631
f :1. 1 1 1 2.601 n+ :1. S 1 1 1. . 3 0 1 0+001 16.631
1. 1 :1. 1 2.701 6.211 :1. 1 .27 1 0.001 1 6+ 64 1

1. 1 1. f :_'. ,- i O 1 6 .. ? '4 I 1 1 .:I. / 1 U.001 1 6 . 6 1 1
1. I .1 ! 2.901 6,271 :I.1 • 1. 0 1 0.001 16.651
1 1 1 1 3,001 6.301 11.031 0.001 16.651
1. 1 .1 1 3.101 6.331 10.961 0,001 16,661
1 1 1 I 3.201 6.361 10,891 04001 164661
1 1 1 1 3.301 6.381 10.831 0.001 16.671
1 1 1 1 3,401 6.411 10.761 0.001 16.671
1 1 1 I 3.501 6.441 10.691 0.001 16,681
1 1 1 1 3.601 6.471 :I0.631 0,001 16.681
1. 1 1 1 3.701 6.491 10.561 0.001 16.691
1 ! 1 1 3.801 6.521 10,501 0+001 16.691
1 1 1 1 3.901 6,541 10,431 0.001 16.701
1 1 1 1 4,001 6.571 10.371 0.001 16.701
1 1 1 1 4.101 6.601 10.311 0.001 1 6.71 1
1 1 1 1 4.201 6.621 1.0.241 0.001 16.7:11
1 1 1 1 4.301 6.651 10.181 0.001 16.721
1 1 1 1 4.401 6.671 10.121 0.001 16.721
1 1 1 1 4.501 6.691 104051 0.001 16.731
1 1 2 I 4.501 6.691 10.051 0.001 16.731
1 1 2 I 4.601 5,721 8.411 0.001 16.731
1 1 2 ! 4.701 5.151 7.041 0+001 16.731
1 1 2 1 4.801 4.871 5.891 0.001 16.731
1 1 2 1 4.901 4.821 4+931 0.001 16.731
1 1 2 i 5.001 4.911 4.1.31 0.001 16.731
1 1 2 1 5.101 5. 1.1 1 3.451 0.001 16,731
1 1 2 1 5.201 5.381 2.891 0.001 16.731
1 1 2 1 5+301 5.691 2.421 0.001 16+731
1 1 2 1 5.401 6.011 2.031 0.001 16.731
1 1 i 1 5.501 6.341 1.691 0.001 16.731
1 1 2 1 5.601 6.671 1.421 0.001 1.6.731
1 i 1 5+701 6.981 1.191 0.001 16.731
1 1 2 1 5.801 7.281 0.991 0.001 16.731
1 1 2 1 5.901 7.561 0,831 0,001 16.731
1 I 2 1 6.001 7.811 0.701 0.001 16.731
1 1 2 1 6.101 8.051 0,581 0.001 16.731
1 1 2 l 6,201 8.261 0.491 0.001 16+731
1 1 7 1 6.301 8.451 0, 41 1 0.001 16.731
1 1 2 1 6.40I 8.621 0.341 0.001 16.731
1 1 2 1 6.501 8+771 0.291 0.001 16.731
1. 1 2 1 6.601 8.911 0.241 0+001 16.731
1 1 2 1 6.701 9.031 0,201 0.001 16.731
1 1 2 1 6.801 9.141 0.171 0.001 16.731
1 1 2 1 6.901 9.231 0.1.41 0.001 16.731
1 1 2 1 7.001 9+311 0.121 0.001 1.6.731
1 1 2 1 7.101 9,391 0.101 04001 16.731
1 21 7.201 9.45! 0.081 0.001 16.731
1 1 2 1 7.301 9.511 0.071 0+001 16.731
1 1 2 I 7.401 9,551 0.061 0+001 16.731
1 1 L 1 7.501 9.601 0.051 0.001 16.731
1 1 2 1 7.601 9,631 0.041 0.001 16+731
1 1 2 1 7,701 9.661 .0,031 0.001 16,731
1 1 2 1 7.801 9.691 0.031 0.001 1.6.731
1 1 2 1 7,901 9,711 0.021 0.001 16.731
1 1 2 1 8.001 9,731 0.021 0.001 16.731
1 1 2 I 8.1.01 9.751 0.021 0.001 16.731
1 I 2 1 8.201 9.771 0.011 0.001 16.731
1 1 2 1 8.301 9.781 0.011 0.001 16.731
1 1 2 I 8.401 9.791 0.011 0.001 16.731
1 1 2 1 8.501 9.801 0.011 0♦001 16.731
1 1 1 1 0.001 5.231 12.331 0.001 16.501
1 1 1 1 0.101 5.28! 12,261 0.001 16.511
1 1 1 I 0.201 5.331 12.1.81 0.001 16.511
1 1 :1 1 0.301 5.381 1.2.1.11 0.001 16.521
1. 1 1. 1 0.401 5.431 12.031 0.001 16.52i
1. 1 1 1 0.501 5,471 11.961 0,001 16.531
1 1 1 1 0.601 5,521 11.881 0.001 16.531

1 1 :1. 1 0. 0 1 5. 5 6 1 11.811 0.001 J6.541
• 1. 1 1 1 0+801 5.601 11.741 0.001 16,541
. 1.• 1 1 1 0.901 5.651 1.1 .67 1 0.001 16.551
1 1 1 1 1.001 5.691 11.591 0.001 16.551
1 1 1 1 1.101 5.731 11.521 0.001 16.561
1 1 1 1 1.201 5.771 11.451 0.001 16.561
1 1 1 1 1,301 5.811 11.381 0.001 16,571
1 1 1 1 1,401 5.851 11.311 0.001 16.571
1 1 1 1 1.50E 5.891 11.241 0.001 16.581
1 1 1. 1 1.601 5.931 1.1.1.71 0.001 16.581
1 1 1 1 1.701 5,961 11.101 0.001 16.591
1 1 1 1 1.801 6.001 1.1,041 0.001 16.59E
1 1 1 1 1.901 6.041 10.971 0.00E 1.6.601
1 1 1 1 2.001 6.071 10.901 0.001 16.601
1 1 1 1 2.101 6.111 10.831 0.001 16.611
1 1 1 1 2.201 6.141 10,771 0.001 1.6.611
1 1 1 1 2.301 6.181 10.701 0.001 16.621
1 1 1 1 2.401 6.211 10.641 0.001 16.621
1 1 1 1 2.501 6.241 10.571 0.001 16.631
1 1 1 1 2+601 6.281 10.501 0.001 16.631
1 1 1 1 2.701 6.311 10.441 0.001 1.6.641
1 1 1 1 2.801 6.341 10.381 0.001 16.641
1 1 1 1 2.901 6.37E 1.0.311 0.001 16.651
1 1 1 1 3.001 6.40E 10.251 0.001 16.651
1 1 1 1 3.101 6.431 1.0.191 0.001 16.661
1 1 1 1 3.201 6.461 10.121 0.001 :1.6.661
1 1 1 1 3.301 6.491 1.0.061 0.00E 16.671
1 1 1 1 3.40E 6.521 10.00E 0.001 16.671
1 1 1 1 3.501 6.55E 9.941 0.001 16.681
1 1 1. 1 3.601 6.581 9.881 0.001 16.681
1 1 1 1 3.701 6.611 9.821 0.001 16.691
1 1 1 1 3.801 6.641 9+761 0.00E 1

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OFFICE OF
THE DIRECTOR
CITY OF DURHAM
NORTH CAROLINA
eparp rent of )Water Resources
I:c
1
WATER QUA! ITy
SLC I:or4 .7anuary 31,
Mr. Robert F. Helms, Director
Department Natural Resources
and Community Development
Division of Environmental Management
Post Office Box 27687
Raleigh, North Carolina 27611
Dear Mr. Helms:
1985
lcfl I V liD
FEB 5 1985
Diu. C4 bt.
RECe`ttit
F F B iG 1985
WATER QUALITY SECTION
OPERATIONS BRANCH
SUBJECT: Permit No. NC0047597
City of Durham
Farrington Road Waste-
water Treatment Plant
In accordance with the above NPDES Permit, the City of Durham was
given a period of sixty days following start-up to bring the
Farrington Road Wastewater Treatment Plant into compliance with
the final effluent limits. Within fourteen days following this
period, the City is required to submit a report on the compliance
or noncompliance of the Plant.
A copy of the monitoring report for December, 1984, is attached.
Please note that the Plant meets all effluent limits except those
for biochemical oxygen demand (BOD5) and ammonia nitrogen.
The permit limit is seven milligrams per liter (mg/L) for BOD5
and the monthly average for BOD was eight mg/L. The BOD5 average
for the first twenty days of January, 1985, was less than seven
mg/L (6.75 mg/L). The permit limitation for ammonia nitrogen is
2.0 mg/L and the average for December, 1984, was 2.7 mg/L. The
average for the first twenty days of January, 1985, was 0.7 mg/L.
We are therefore happy to report that within the sixty day com-
pliance period, the Farrington Road Wastewater Treatment Plant
was able to achieve the final effluent limits required by the
permit.
We anticipate that the facility will continue to produce an
effluent of this quality. However we do foresee a continuance of
the close tolerance of BOD5 results during cold weather months.
101 CITY HALL PLAZA, DURHAM, NORTH CAROLINA 27701
[phone]
AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER

Mr. Robert F. Helms
Page 2
prewould therefore like to request that our application for
ieasonal effluent limits (see attached letter dated May 31, 1983)
be given further consideration. Your letter dated January 21,
1985, denying our request was received today. It is our under-
standing that both the Mason Farm Plant (OWASA) and the Durham
County Plant, have previously been given seasonal effluent
limits. We therefore, do not understand the basis for denying
our request. We would like to request that your staff provide us
with the detailed data and analysis upon which your decision was
based. It is our strong opinion that there is very little docu-
mented evidence to support that apparent conclusions of your
model. We are aware of no significant problems in the receiving
stream during the winter months in the past, even though the
waste discharges of the four existing plants replaced by the
Farrington Road Wastewater Treatment Plant, had significantly
higher BOD5 and ammonia levels in their discharges. „Based on
this fact, we would be very interested in reviewing data and
model analysis so that we might better understand the basis for
the denial of our request. The potential savings in operating
cost to the City of Durham if this seasonal effluent limit re-
quest were granted, could be substantial. Your assistance in
providing the requested information and the reconsideration of
this request will be greatly appreciated.
Please do not hestiate to contact us if we can provide any
further information.
Sincerely,
DEP:RTME OF WATER RESOURCES
Ad
/A. 4T. Rolan
Director
ATR/cgb
Attachments
cc: Cecil A. Brown, Assistant City Manager
Mr. William W. Telford, Jr., Superintendent of Treatment
Plants I
W. M. Piatt and Company
Mr. Donald E. Francisco, Lecturer

INFLUENT SAMPLES
A. CITY OF DURHAM/DURHAM COUNTY B. DECEMBER 1984
C. NC0047597102 FARRINGTON
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
00400 00010 00545 00310 00610 00500 00530 38260 00076 00340 71900 01042 01034 01067 01092 00625 00665 00720 01027 01051
DATE OF GRAB COMP pH TEMP SETT.M SOD-5 NH3-N TOT.RES TSR MBAS TURBID COD Hg Cu Cr Ni In TKN TOTAL P CYAN Cd Pb
SAMPLE TINE TIME Units Deg.C. •1/1 mg/1 mg/I ■g/1 mg/1 mg/1 NTU mg/1 ug/1 ug/1 ug/I ug/1 ug/1 mg/I mg/I mg/1 ug/1 ug/1
1 24 190 144
2 24 160 18.6 128
3 24 7.4 193 9.9 446
4 24 7.1 170 14.1 190
5 1300 24 7.4 360 12.7 535 249 5.5 2.5 540 50 100 230 5.2 50 100
6 24 7.2 100. 157
7 24 7.1 198 125 0.14
8 24 163 122
9 24 152 16.3 133
10 24 7.1 300 15.8 175
11 24 7.0 330 16.8 534 240 9.0 770 1.9 80 50 100 240 23.8 4.7 50 100
12 24 7.4 210 15.1 189
13 1340 24 7.2 418 17.3 342 0.14
14 1315 24 7.2 200 270
15 1310 24 7.2 270 163
16 1305 24 7.2 210 17.4 296
17 1315 24 7.8 210 18.5 302 5.5
18 1400 24 7.1 390 13.8 605 514 4.3 3.2 380 50 100 ' 1100 50 100
19 1245 24 7.1 210 16.3 436 0.19
20 1400 24 7.0 230 208
21 1245 24 7.2 200 15.2 139
22 24 6.8 182 90
23 24 7.1 183 172
24 24 6.9 260 103
25 1310 24 6.9 470 311
26 1315 24 7.0 480 17.5 390 755 2.5 50 50 100 50 50 100
27 1325 24 7.2 225 18.3 144 0.27
28 1530 24 7.1 200 116
29 1245 24 7.7 220 158
30 1125 24 7.0 170 13.5 114
31 24 240 173
MONTHLY AVERAGE XXXX 244 15.7 558 217 6.3 763 2.5 263 50 100 405 23.8 5.1 0.19 50 100
MONTHLY MAXIMUM 7.8 480 18.6 605 514 9.0 770 3.2 540 50 100 1100 23.8 5.5 0.27 50 100
MONTHLY MINIMUM 6.8 100 9.9 534 90 4.3 755 1.9 50 50 100 50 23.8 4.7 0.14 50 100
TYPE OF I COMP XXXXX XXXXXXXXXXXXXX
SAMPLE I GRAB X

EFFLUENT SAMPLES
6. DECEMBER 1984 H. NC0047597103 FARRINGTON
E. FLOW MEASURED AS: INFLUENT A. CITY OF DURHAM/DURHAM COUNTY
1 2 3 4 5 6 7 B 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 ' 26
50047 50048 50050 00010 00400 00545 50060 00310 00340 00610 00500 00530 00665 00556 31616 00076 01042 01034 00300 00625 38260 00720 71900
DATE OF GRAB COMP (WASTEWATER FLOW-MSDX TEMP pH SETMTR RESC12 B00-5 COD NH3-N TOT.RES TSR TOT.P 0&6 FECAL TURBID Cu Cr D.O. TKN MBAS CN Hg
SAMPLE TIME LENGTH I MAX MIN TOTAL: Deg.0 Units m1/1 mg/1 mg/1 mg/1 mg/1 mg/1 mg/1 mg/1 ag/1 4/100m1 NTU ug/1 ug/1 mg/1 ag/1 ag/1 mg/1 ug/1
1 930 24 8.0 5.60 18 6.9 10 7 8.4
2 1000 24 8.5 5.89 16 7.0 5 7.2 12 8.5
3 835 24 17.5 10.80 16 7.3 16 6.3 24 18000 8.5
4 815 24 9.0 8.71 15 6.9 7 4.1 11 32 8.9
5 1305 24 19.0 11.23 15 7.0 0.1 7 3.8 289 22 2.6 27 50 50 8.9 0.2 0.4
6 805 24 19.0 14.01 7.4 16 43 3800 0.11
7 24 10.0 9.02 7.1 18 17 9
8 915 24 9.6 7.96 15 6.8 9 52 8.6
9 900 24 10.0 6.74 13 7.1 4 4.8 26 9.4 _
10 24 10.0 7.40 6.5 7 5.0 20 1000000
11 24 9.0 7.62 17 6.5 8 100 2.8 401 52 4.3 9 50 50 8.9 9.4 0.2 1.6
12 24 9.0 7.63 16 7.0 19 3.6 64 .1091 8.6
13 1345 24 8.0 7.43 17 6.2 4 1.4 7 7.9 0.08
14 1320 24 7.0 7.75 19 6.7 2 20 •4 70 8.1
15 1315 24 9.5 6.75 17 6.7 5 4 8.3
16 1315 24 10.0 6.38 16 6.3 3 0.2 6 8.3
17 1320 24 8.6 6.61 17 6.9 0.1 2 0.1 6 5.9 11 7.8
18 1405 24 9.0 7.41 18 6.9 0.1 4 1.3 315 6 9 50 50 7.8 0.3 1.1
19 1250 24 9.0 7.01 18 6.7 0.1 7 0.4 8 2600 8.1 0.08
20 1405 24 9.0 6.23 18 6.6 0.1 5 6 5.1 167 8.3
21 1245 24 9.0 7.03 18 7.0 11 1.9 9 1000000 4.6
22 1300 24 8.5 6.56 18 7.0 6 4 5.7
23 1350 24 9.0 5.57 17 6.7 0.1 9 6 8.6
24 1400 24 9.0 5.89 16 6.2 # 11 8.4
25 1315 24 9.5 5.74 16 6.3 0 8 8.8
26 1320 24 9.0 5.47 16 6.2 25 0.1 9 8.9
27 1315 24 8.2 5.73 16 6.9 0.1 5 2.8 10 3 50 50 8.7 0.07 0.9
28 1520 24 9.5 5.56 16 6.8 0.1 5 10 9 8.7
29 1255 24 9.5 5.45 18 7.2 6 8 8.5
30 1135 24 18.0 5.74 19 6.5 0.1 10 8.7
31 1340 24 9.0 5.37 18 6.2 0.1 10 8.6
MONTHLY AVERAGE 10.2 ERR 7.17 17 XXXX 0.1 ERR c)13 63 2.7 F 335 16✓ 4.3 5.1 274 50 50 8.3 9.4 0.2 0.09 1.0
MONTHLY MAXIMUM 19.0 ERR 14.01 19 7.4 0.1 ERR 100 7.2 401 64 5.9 5.1 1000000 50 50 9.4 9.4 0.3 0.11 1.6
MONTHLY MINIMUM 7.0 ERR 5.37 13 6.2 0.1 ERR 2 25 0.1 289 4 2.6 5.1 3 50 50 4.6 9.4 0.2 0.07 0.4
• TYPE OF I COMP XXXXXX X X XXXX
SAMPLE 0 GRAB X X X X X X X
N. FARRINGTON ROAD WASTEWATER TREATMENT PLANT
O. SAMPLES COLLECTED BY:ISAIAH D. BARTLETT P. CERTIFIED BY
t .w Rome. n •ir n-Rn n.�R.rl r P�1�RHr.
11�� , • �V u TrI r"r n !C

UPSTREAM SAMPLES
B. DECEMBER 1984 C. NC0047597101 A. CITY OF DURHAM/DURHAM COUNTY FARRINGTON
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
00010 00300 00400 00310 00340 31616 31614 .00530 00545 00076 32730 38260 71900 01042 01034 01067 01092 00065 00665 00556 00610 00625
DATE OF GRAB TEMP D.O. pH BOD-5 COD FEC-MF FEC-MPN TSR SETMTR TURBID PHENOL MBAS Hg Cu Cr Ni Zn Sf.Gg TOTAL-P D&8 NH3-N TKN NO3-N NO2-N
SAMPLE TIME Deg.0 mg/1 Units sg/1 sg/I 1/100s1 1/100s1 mg/1 41/1 NTU ug/1 .g/1 ug/l ug/1 'ug/1 ug/1 ug/1 FEET mg/1 mg/1 mg/1 sg/1 mg/1 mg/1
1
2
3
4
5 1005 7 9.4 7.3 3 400
6
7
8
9
10
11
12 850 7 10.1 7.7 4 30 694
13
14
15
16
17
18
19 840 10 7.9 6.9 1 360
20
21
22
23
24
25
26
27 820 6 8.8 6.0 4 5 390
28
29
30
31
MONTHLY AVERAGE 8 9.1 XXXX 3 18 444
MONTHLY MAXIMUM 10 10.1 7.7 4 30 694
MONTHLY MINIMUM 6 7.9 6.0 1 5 360
N CTRroM u.Nr AUn CCNpI r I fir:1TTn►1. unrr rrrri/ AT w' um,/ rq

DOWNSTREAM SAMPLES
8. DECEMBER 1984 D. NC0047597104
A. CITY OF DURHAM/DURHAM COUNTY FARRINGTON
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 - 19 20 21 22 23 24 2 26
00010 00300 00400 00310 00340 31616 31614 00530 00545 00076 32730 38260 71900 01042 01034 01067 01092 00065 00665 00556 00610 00625
DATE OF GRAB TEMP D.Q. pH BOD-5 COD FEC-MF FEC-MPN TSR SETMTR TURBID PHENOL MBAS Hg Cu Cr Ni Zn Sf.6g TOTAL-P O&6 NH3-N TKN NO3-N NO2-N
SAMPLE TIME Deg.0 ag/I Units eg/1 mg/1 11/100e1 4/1004 ag/1 e1/1 NTU ugll ®g/1 ug/1 ug/1 ug/1 ug/1 ug/I FEET ag/1 ag/1 ag/1 eg/1 mg/1 eg/1
1
2
3
4
5 955 8 8.7 7.2 4 440
6
7
8
9
10
11
12 840 5 7.8 7.4 8 60 22000
13
14
15
16
17
18
19 845 12 6.4 6.9 2 2600
20
21
22
23
24
25
26
27 805 10 7.6 7.0 3 15 10
28
29
30
31
2.4 1.4
2.1 2.3 5.3 2.7 0.23
2.6 0.6
MONTHLY AVERAGE 9 7.6 XXXX 4 38 708 2.4 1.4 5.3 2.7 0.23
MONTHLY MAXIMUM 12 8.7 7.4 8 60 22000 2.6 2.3 5.3 2.7 0.23
MONTHLY MINIMUM 5 6.4 6.9 2 15 10 2.1 0.6 5.3 2.7 0.23
M. STREAM NAME AND SAMPLE LOCATION: NEN HOPE CREEK AT ST.RD.1107

DIVISION OF ENVIRONMENTAL MANAGEMENT
January 7, 1985
MEMORANDUM
TO: Steve Tedder
THRU: Jay Sauberj,t6e37L---
FROM: Robert Farmer
SUBJECT: Status of the Farrington WWTP
I last talked with Terry Roland on 3 January, 1985 about the status
of the Farrington WWTP. Terry is with the Durham Public Works Depart-
ment.
Terry says the Farrington Plant is fully operational. It is now
treating 6-7 MGD. Design flow is 10 MGD.
The plant replaces and incorporates 4 other Durham County WWTP.
They are the 3rd Fork plant, Sandy Creek Plant, the New Hope Creek Plant,
and the Hope Valley Plant. The 3rd Fork and New Hope Plants may at some
time be used for pretreatment.
The plant has extended aeration (fine bubble diffuse air). They are
using 2 of the 4 aeration basins they have available, providing a 12 hour
retention time.
The discharge point is on New Hope Creek approximately 1 mile down-
stream of Hwy 54. Permit limits are a BOD5 of 7, NH3 of 2.
They are requesting summer -winter effluent limits be changed. They
do not see the need for the low NH3 limits during the winter months.
RF/gh
cc: Jim Overton
Meg Kerr