NC0038822_Speculative Limits_20061115

r
DIVISION OF WATER QUALITY
November 15, 2006
To: Mike Mickey, Environmental Engineer
Surface Water, Winston-Salem Regional Office
From: Susan A. Wilson, Supervisor
Western NPDES Program
Subject: Speculative Limits Request°
Central Care, Inc.
NPDES Permit No. NC0038822
Surry County
The NPDES Program has performed a preliminary model for the potential relocation of the
discharge from the Central Care WWTP. For the proposed location on the unnamed tributary
to Stewarts Creek at Highway 601, the following flows were estimated (reference USGS Low
Flow Report)' based on a drainage area of 1.61 mi2:
7Q 1 Os = 0.21 cfs
7Q IOw = 0.34 cfs
Qavg = 2.17 cfs
Using these flows, a Level B model was performed for the permitted flow of 0.01 MGD. The
results of the Level B model indicated the following limits would be protective:
PF = 0.01 MGD
BOD5 = 30 mg/1
NH3-N (summer) = 11.mg/1 (no winter limit)
Residual chlorine = 28 ug/1
(no effluent D.O. limit)
Other limits would remain the same.
If you have any questions, please contact me at (919) 733 - 5083, ext. 510.

SUMMER
MODEL RESULTS
Discharger
:
CENTRAL CARE
Receiving Stream :
UT STEWARTS CREEK
----------------------------------------------------------------------
The End D.O.
is 7.80
mg/l.
The End CBOD
is 3.22
mg/l.
The End NBOD
----------------------------------------------------------------------
is 1.98
mg/l.
WLA
WLA
WLA
DO Min
CBOD
NBOD
DO Waste Flow
(mg/1)
------
Milepoint Reach #
----------------
(mg/1)
----
(mg/1)
----
(mg/1) (mgd)
-- ----------
Segment 1
6.93
0.00 1
Reach 1
45.00
49.50
0.00 0.01000

SUMMER
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4.01
0.23
1
1
0.35
7.39
4.-55
3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23
1
1
1.40
7.74
3.51
2.31
0.23
1
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4.01
0.23
1
1
0.35
7.39
4.55
3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71-
3.66
2.50
0.23
1
1
1.40
7.74
3.51
2.31
0.23
1
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4.01
0.23
1
1
0.35
7.39
4.55
3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23
1
1
1.40
7.74
3.51
2.31
0.23
1
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD '
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4.01
0.23
1
1
0.35
7.39
4.55
3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23
1
1
1.40
7.74
3.51
2.31
0.23
1
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4.01
0.23
1
1
0.35
7.39
4.55
3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23

1
1
1.40
7.74
3.51
2.31
0.23
1
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4:01
0.23
1
1
0.35
7.39
4.55
3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23
1
1
1.40
7.74
3.51
2.31
0.23
1
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4.01
0.23
1
1
0.35
7.39
4.55
•3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23
1
1
1.40
7.74
3.51
2.31
0.23
1
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4.01
0.23
1
1
0.35
7.39
4.55
3.70
0.23
1
1
0.53
7.49•
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23.
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23
1
1
1.40
7.74
3.51
2.31
0.23
1,
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22
4.75
4.01
0.23
1
1
0.35
7.39
4.55
3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23
1
1
1.40
7.74
3.51
2.31
0.23
1
1
1.58
7.77
3.36
2.14
0.23
1
1
1.75
7.80
3.22
1.98
0.23
Seg
#
Reach
#
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.93
4.96
4.33
0.23
1
1
0.18
7.22.
4.75
4.01
0.23
1
1
0.35
7.39
4.55
3.70
0.23
1
1
0.53
7.49
4.35
3.42
0.23
1
1
0.70
7.57
4.17
3.16
0.23
1
1
0.88
7.62
3.99
2.93
0.23
1
1
1.05
7.67
3.83
2.70
0.23
1
1
1.23
7.71
3.66
2.50
0.23

1 2.31 0.23
2.14 0.23
1.98 0.23
NBOD Flow
1
1.40
7.74
3.51
1
1
1.58
7.77
3.36
1
1
1.75
7.80
3.22
Seg #
I Reach #
I Seg Mi
D.O.
CBOD

*** MODEL SUMMARY DATA ***
Discharger
Receiving Stream
Summer 7Q10
Design Temperature:
CENTRAL CARE Subbasin : 030703
UT STEWARTS CREEK Stream Class: C
0.21 Winter 7Q10 0.34
25.0
VELOCITY
DEPTH
Kd
Ka
------------
ILmileHI
-------------------------------------------------------------------
ft/mEI
I Idesdignl
@200
Idesignj
@200
Idesigni
Segment 1
I 1.751
33.00I
0.100
10.39 10.40
10.32
16.62 I
5.941
0.73
Reach 1
Flow
CBOD
NBOD
D.O.
cfs
I mg/1
I mg/1
mg/1
Segment 1
Reach 1
Waste
0.015
45.000
49.500
0.000
Headwaters
0.210
2.000
1.000
7.440
Tributary
0.000
2.000
1.000
7.440
* Runoff
0.000
2.000
1.000
7.440
* Runoff flow is in cfs/mile

DA = 1.61 mil
Facility: Central Care 7Q10s = 0.21 cfs
Discharge to: UT to Stewarts Creek 7Q10w = 0.34 cfs
Residual Chlorine
Ammonia as NH3
(summer)
7Q10 (CFS)
0.21
7Q10 (CFS)
0.21
DESIGN FLOW (MGD)
0.01
DESIGN FLOW (MGD)
0.01
DESIGN FLOW (CFS)
0.0155
DESIGN FLOW (CFS)
0.0155
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (UG/L)
0
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
6.8T
IWC (%)
6.87
Allowable Conc. (ug/1)
247.32
Allowable Concentration (mg/1)
11.57
Ammonia as NH3
(winter)
7Q10 (CFS)
0.34
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
0.01
Ratio of 13.5 :1
DESIGN FLOW (CFS)
0.0155
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
4.36
Allowable Concentration (mg/1)
36.46
For Minor domestic -type facilities:
Minimum of 2 mg/I (summer) NH3-N; 4 mg/I (winter) NH3-N
Chlorine:
Residual chlorine must be capped at 28 ug/I to protect for acute toxicity effects

MODEL INPUTS FOR LEVEL B ANALYSIS
GENERAL INFORMATION
Facility Name:
hR� Gt
NPDES No.:
Ncm38s3ZZ
_ _,
Type of Waste:
Facility Status:
Receiving Stream:
6r.
Stream Classification:
Subbasin:
c) *3 O
County:
U (P q
Regional Office:
Topo Quad:
p 1J
FLOW INFORMATION
USGS#
Date of Flow Estimates
Drainage Area (n- 2):
1�91
Summer 7Q10 (cfs):
D
Winter 7Q10 (cfs):
, s-
Average Flow (cfs):
Z ,1 7
30Q2 (cfs):
--''
TWC at Point of Discharge (%): _
4`v
Cummulative IWC (%):
MODEL INPUT INFORMATION
LENGTH OF REACH (miles)
f 7�
INCREMENTAL LENGTH (miles)
0.17 }
WASTE CHARACTERISTICS
FLOW (MGD)
0.01
CBOD (mg/1)
4S 30
NBOD (mg/1)
S
D.O. (mg/1)
^'
RUNOFF CHARACTERISTICS a,- 4 (? C S
7Q10 (cfs/mi2)
QA (cfs/mil)
CBOD (mg/1)
NBOD (mg/1)
D.O. (mg/l)
TRIBUTARY CHARACTERISTICS
7Q10 (cfs)
QA (cfs)
CBOD (mg/1)
NBOD (mg/1)
D.O. (mg/1)
SLOPE (fpm)
"
Name of facility

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Re: Central Care
Subject: Re: Central Care
From: Charles Weaver <[e-mail]>
Date: Wed, 30 Aug 2006 08:57:33 -0400
To: Mike Mickey <[e-mail]>
CC: Susan A Wilson <[e-mail]>
Mike Mickey wrote:
Charles - Steve wants to tell Central Care what their limits would be if if they relocated. Can we
get a set of speculative limits if I sent a topo showing the proposed location? Mainly interested in
NH3-N. Mike.
Yes. Only Jackie & Toya do modeling, so it will take a little while.
Paul informed me that we would do a spec in this case. Normally we don't do them for private
facilities.
Send me the.request. I'll meet with Susan to see who will model it.
CHW
On 8/25/2006 6:34 AM, Charles Weaver wrote:
Mike Mickey wrote:
Charles - We are meeting on Monday with Central Care, Inc. to discuss their
noncompliance situation.
One compliance option is for them to extend the outfall to a positive flow stream. What
criteria is used to determine if a facility gets a NH3-N limit?
The ammonia toxicity policy is attached. I think it answers your question ... I think.
CHW
1 of 1 8/31/2006 2:50 PM

Permit NC0038822
KR
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on August 1, 2005 and lasting until expiration, the Permittee
is authorized to discharge from outfall 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
yCEC FIiFAIsIIAFGN. T`. R$tSA ,'ICS;�"+�'
TE
xl'# .,,g ii* `�i+ a
. . � s •�o `��'q�.,'"is� �?•����:.
IT�
'Sry51- e �'� ' Ya14Ttdl�i r�
tp' q _..'.Y`..::.., ,,4 ""--1*i •.":i ZeV
t)tly �� g a.�l.
w�'3-�.0'�it.: �'`�d+h'' ; �
NITO�
eRtp4IzrFN�G�.0.o-Rrv,E. C�. IR' EIJ�E
^.MO'l�'
.;
ea�su7£een �Satnp eTe SmrLocatron
ar Q f�C
Weekly Instantaneous Influent or Effluent
Flow
0.010 MGD
BOD, 5-day (202C)
30.0 mg/L
45.0 mg/L
2/Month
Grab
Effluent
Total Suspended Solids
30.0 mg/L
45.0 mg/L
2/Month
Grab
Effluent
NH3 as N
(April 1- October 31
2.0 mg/L
10.0 mg/L
Monthly
Grab
Effluent
NH3 as N
November 1— March 31
4.0 mg/L
20.0 mg/L
Monthly
Grab
Effluent
Dissolved Oxygen
Weekly
Grab
Effluent, .
Upstream & Downstream
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
2/Month
Grab
Effluent
Total Residual Chlorine2
17pg/L
2/Week
Grab
Effluent .
Temperature (2C)
Daily
Grab
Effluent
Temperature (2C)
Weekly
Grab
Upstream & Downstream
pH
> 6.0 and < 9.0 standard units
2/Month
Grab
Effluent
Footnotes:
1. Upstream = at least 100 feet above discharge location. Downstream = at least 300 feet
below discharge location.
2. This limit will become effective February 1, 2007. - Until then, the Permittee shall
monitor TRC [with no effluent limit].
There shall be no discharge of floating solids or visible foam in other than trace amounts

Central Care Inc. relocation
Residual Chlorine
Ammonia as NI.13
(summer)
7Q10 (CFS)
0.4
7Q10 (CFS)
0.4
DESIGN FLOW (MGD)
0.01
DESIGN FLOW (MGD)
0.01
DESIGN FLOW (CFS)
0.0155
DESIGN FLOW (CFS)
0.0155
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (1
0
UPS BACKGROUND LEVEL
0.22
IWC (%)
3.73
IWC (%)
3.73
Allowable Concentration (ugj
455.71
Allowable Concentration (m
21.13
Ammonia as NH3
(winter)
7Q10 (CFS)
0.7
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
0.01
Ratio of 25.8 :1
DESIGN FLOW (CFS)
0.0155
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL
0.22
IWC (%)
2.17
Allowable Concentration (m
73.15
9/7/2006

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