NC0062219_Wasteload Allocation_19900820

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO062219
PERIVIITTEE NAME: Carolina Water Service, Inc. of N.C. / Kings
Facility Status: Existing
Permit Status: Renewal
Major Minor. �1
Pipe No.: 001
Design Capacity: 0.210 MGD
Domestic (% of Flow): 100
Industrial (% of Flow):
Comments:
RECEIVING STREAM: an unnamed tributary to Poplar Creek
Class: C-NSW
Sub -Basin: 03-04-02
Reference USGS Quad: E25NW (please attach)
County: Wake
Regional Office: Raleigh Regional Office
Previous Exp. Date: 2/28/91 Treatment Plant Class: 2
Classification changes within three miles:
No chanize within three miles.
Requested by: Mack Wiggins
Prepared by:
Reviewed by:
Date: 5/31/90
Date: 81 g q 0
Date:
Modeler
Date Rec.
#
SC M
3c �0
5 1Z3
Drainage Area (mi 2 ) 0. 2, Avg. Streamflow (cfs): n. z
7Q10 (cfs) Winter 7Q10 (cfs) (9.0 (, 30Q2 (cfs) 0. 0 8
Toxicity Limits: IWC Cl q % Acute FonDic
Instream Monitoring: n
Parameters W � e'^�� l co �� /Q
Upstream Location 7-
Downstream `( Location �r �� � 1111 1vtv Q
Ow�S u,n� •
Effluent
Characteristics
Summer
Winter
BOD5(m )
NH3-N (mg/1)
Z O
D.O. (mg/1)
6
6
TSS (mg/1)
3 p
3 Q
F. Col. (/100 ml)
O'D
.Z O
pH (SU)
6 — q
6-9
-PLVOff
r'
, i)
Comments:

0
Request No.: 5723
------------------- WASTELOAD ALLOCATION APPROVAL FORM -----------`-=-=---
Facility Name:
NPDES No.:
Type of Waste:
Status:
Receiving Stream:
Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Quad:
Carolina Water Service/Kings Grant 66 6 AYU
NC0062219
Domestic
Existing/Renewal
UT to Poplar Creek
C-NSW
030402
Wake
Raleigh
Mack Wiggins
053190
E 25 NW
QFRMITs R, PICINF,Nr
90 0208740925
Drainage
area:
0.210
sq mi
Summer
7Q10:
0.00
cfs
Winter
7Q10:
0.06
cfs
Average
flow:
0.24
cfs
30Q2:
0.08
cfs
9
-------------------- RECOMMENDED EFFLUENT LIMITS
-------------------------
EXISTING
EXISTING
PROPOSED
PROPOSED
SUMMER
WINTER
SUMMER
WINTER
Wasteflow (mgd):
0.21
0.21
0.21
0.21
BOD5 (mg/1) :
26
30
26
30
NH3N (mg/1) :
20
20
DO (mg/1) :
6
6
6
6
TSS (mg/1) :
30
30
30
30
Fecal coliform (#/100ml):
1000
1000
200
200
PH (su) :
6-9
6-9
6-9
6-9
Toxicity Testing Req.:
n/a
n/a Chronic
Ceriod/QRTRLY/990
----------------------------
MONITORING
----------------------------------
Upstream (Y/N): Y
Location: 200
ft above
discharge
Downstream (Y/N): Y
Location: At
bridge immediately downstream
----------------------------- COMMENTS --------- --------------------------
The following instream parameters should be monitored: DO, temp, cond,
PH and fecal coliform. The RRO should inform the permittee that DEM may
require the elimination of discharges to intermittent streams. Therefore,
the permittee should investigate waste disposal alternatives before further
resources are allocated toward expansion of existing treatment works.
-------------------------------------- ----------------------------------
Prepared by: Date: (2 r�
Juan C. Mangles
Reviewed by
Instream Assessment:
y Regional Supervisor:
Permits & Engineering:
RETURN TO TECHNICAL SUPPORT BY: ,JUL 26 1990
Date: 15
i
Date
Date:

10/89
Facility Name 1(mq)e Gv'a4.Permit # �3 c �0 • G 2.21 G
CHRONIC TOXICITY TESTING REQUIREMENT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity in any two consecutive toxicity tests,
using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic
Bioassay Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is _qq_% (defined as treatment two in the North Carolina procedure
document). The permit holder shall perform Cuarterl monitoring using this procedure to establish
compliance with the permit condition. The firs est will 'e perfo d after /tidy days from
issuance of this permit during the months of aA v J ILeL . Effluent
sampling for this testing shall be performed at the NPD rmitted finaleffluent discharge below
all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the ameter
par
code TGP3B. Additionally, DEM Fore AT (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
P.O. Box 27687
Raleigh, N.C. 27611
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this
monthly test requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests perfonned by the North Carolina
Division of Environmental Management indicate potential impacts to die receiving stream, this
permit may be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate retesting(within 30 days of initial monitoring event). Failure to submit
suitable test results will constitute noncompliance with monitoring requirements.
7Q10 Q cfs
Permited Flow 0 . 2 1 -0 MGD Recommended by:
IWC% 0
Basin & Sub -basin
Receivinmolu�
tm pt� o
County
Date _ 2.
**Chronic Toxicity (Ceriodaphnia) P/F atq—q%
See Part _, Condition

AMMONIA ANALYSIS
7Q10: 0.0000 cfs
NH3-N Effl. Conc: 20.0000 mg/1
NH3-N STDRD (5=1000;W=1800): 1000 ug/1
Upstream NH3-N Conc.: 220.0000 ug/1
Design Flow: 0.2100 MGD
Predicted NH3-N Downstream: 20000 ug/l
20 mg/1
NH3-N Allowable: 1000 ug/1
1 mg/l
Existing limit does not protect the WQ criteria
Ex. limit
S= 1.0 mg/l; W= 1.8 m
LIMIT

AMMONIA ANALYSIS summer
7Q10: 0.0000 cfs
NH3-N Effl. Conc: 1.9900 mg/l max
NH3-N STDRD (5=1000;W=1800): 1000 ug/l S= 1.0 mg/l; W= 1.8 m
Upstream NH3-N Conc.: 220.0000 ug/l
Design Flow: 0.2100 MGD
Predicted NH3-N Downstream: 1990 ug/l
1.99 mg/l
NH3-N Allowable: 1000 ug/l LIMIT
1 mg/l
DMR's indicate criteria is not protected; SOP: assign existing limit
and whole eff. tox.

AMMONIA ANALYSIS winter
7Q10: 0.0000 cfs
NH3-N Effl. Conc: 1.9900 mg/l max
NH3-N STDRD (5=1000;W=1800): 1800 ug/1 S= 1.0 mg/l; W= 1.8 m
- Upstream NH3-N Conc.: 220.0000 ug/1
Design Flow: 0.2100 MGD
Predicted NH3-N Downstream: 1990 ug/l
1.99 mg/l
NH3-N Allowable: 1800 ug/l LIMIT
1.8 mg/1
DMR's indicate criteria is not protected; SOP: assign existing limit
and whole eff. tox.

INSTREAM SELF -MONITORING DATA
MONTHLY AVERAGES
Discharger: � I'lelo C Permit No.:
Receiving Stream: V 4 Sub -basin:
Upstream Location: Downstream Location
DATE
DEC-90
NOV- 90
OCT-90
SEP-90
AUG- 90
JUL-90
JUN-90
MAY-90
APR-90
MAR- 90
FEB- 90
JAN-90
DEC-89
NOV- 89
OCT-89
SEP-89
AUG-89
JUL-89
JUN-89
MAY-89
APR-89
MAR-89
FEB-89
JAN-89
DEC-88
NOV- 88
OCT-88
SEP-88
AUG-88
JUL-88
JUN-88
MAY-88
APR-88
MAR- 88
FEB-88
JAN-88
DEC-87
NOV- 87
OCT-87
SEP-87
AUG-87
JUL-87
JUN-87
MAY-87
APR-87
MAR- 87
FEB-87
JAN-87
TEMP
NCoo 'Z 2 l q
03 0
Upstream Downstream
D.O.fl
���
COND TEMP D.O. B4D5; COND
83�7
00 3

CHLORINE
7Q10: 0.0000
CL2 Effl. Conc: 0.9000
AL (17/19 ug/1) : 17.0000
Upstream CL2 Conc.: 0.0000
Design Flow: 0.2100
Predicted CL2 Downstream: 900.0000
0.9
CL2 Limit: 17
0.017
ANALYSIS
cfs
mg/l
ug/l
ug/1
MGD
ug/1
mg/l
ug/1
mg/l

JCM
6-25-90
Carolina Water Service/Kings Grant
030402
- The major issue with this renewal is thetDEM is investigating the possi-
bility to eliminate discharges to 7Q10=0/30Q2>0 flow streams in the near future.
Therefore, if this facility is not constructed already to design capacity, the
permittee should be informed about investigating non -discharge alternatives before
more resources are spent into expansion of existing WWTP.
-A whole effluent tox test is required based on ammonia toxicity
-A letter recommending reduction of chlorine in effluent will be mailed to
permittee.

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street 0 Raleigh, North Carolina 27611
James G. Martin, Govemor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary July 5, 1990 Director
Mr. Carl Daniel
Carolina Water Service, Inc.
P.O. Box 240705
Charlotte, North Carolina 28224
Subject: Chlorine Toxicity
NPDES Permit No. NC0062219.
Kings Grant Subdivision
Wake County
Dear Mr. Daniel:
Chlorine, a widely used wastewater disinfectant for the treatment of
coliform organisms, often remains instream in residual amounts that may prove
to be toxic under critical low stream flow conditions. In the last decade,
EPA assessed the potential adverse effects of chlorine to the aquatic envi-
ronment and has taken steps to reduce the impacts through the development of
federal criteria. In 1986, EPA recommended that all states have a chlorine
standard by their next triennial review of water quality standards.
In revising its water quality standards in 1989, North Carolina devel-
oped an action level for chlorine of 17 ug/1 (freshwater classes only). In
addition, the fecal coliform limit was reduced from 1000 colonies/100 ml to
200 colonies/ 100 ml. Under a new DEM procedure, dechlorination and chlorine
limits are now recommended for all new or expanding dischargers proposing the
use of.ohlorine for effluent disinfection. The Division is reviewing chlo-
rine levels from all existing dischargers as part of their NPDES permit
renewal process.
Our records indicate that chlorine from your facility's effluent dis-
charge is considered toxic to the receiving stream under low flow conditions,
i.e., the amount of chlorine discharged causes a violation of the instream
action level for chlorine (17 ug/1) under 7Q10 conditions (the lowest average
flow for seven (7) consecutive days during a ten (10) year period). Action
should be taken to reduce the effluent concentration of chlorine to an
acceptable level. Based on your facility's instream waste concentration of
100%, an acceptable level of chlorine in your effluent is 17 ug/1 (0.017
mg/1). If this level is not feasible, you should consider dechlorination or
alternate methods of disinfection for your facility to ensure that both
chlorine and bacterial limits are met. In addition, if your facility plans
to undertake any phase of construction, dechlorination or alternate disinfec-
tion should be included. However, please note that an authorization to con-
struct must be obtained from this Division prior to any alteration to your
treatment plant.
Pollution Pnsvention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]

Mr. Carl Daniel
Page Two
The Division is currently reviewing its water quality regulations per-
taining to chlorine. In the future, effluent limits and/or dechlorination
may be required of existing facility's with chlorine problems. If the chlo-
rine levels in your facility's effluent remain unchanged, a chlorine limit or
a whole effluent toxicity testing requirement may be added to your permit
limitations.
Please feel free to call Mr. Tim Donnelly of the Division's Regional
Office at [phone], if you have any questions or comments regarding
this issue.
Sincerely,
Steve Tedder
Water Quality Section Chief
SWT/JCM
cc: Raleigh Regional Office
Central Files
Kings Grant Subdivision WLA File