NC0061204_wasteload allocation_19900522

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0061204
PERMI= NAME: Mr. Thomas M. Alphin / Scarlett Acres Mobile
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 001
Design Capacity: 0.024 MGD
Domestic (% of Flow): 100
Industrial (% of Flow): 0 %
Comments:
RECEIVING STREAM: an unnamed tributary to Mill Creek
Class: C
Sub -Basin: 03-07-04
Reference USGS Quad: C 18 NW
County: Forsyth
(please attach)
Regional Office: Winston-Salem Regional Office
Previous Exp. Date: 5/31/90 Treatment Plant Class: Class 2
Classification changes within three miles:
none
Requested by: Rosanne Barona Date: 2R/90
Prepared by: Date: 5dt 0
Reviewedby: Y 1�f.��•L �. � � � � Date: ,5 /a a
Modeler
Date Rec.
�,AA S
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Drainage Area (mil ) 19. �2,:_ Avg. Streamflow (cfs):.
7Q10 (cfs)Winterr 7Q10 (cfs) /)/).30Q2 (cfs)_
Toxicity Limits: IWC q / % Acut hronic
Instream Monitoring:
Col
Parameters_/012 �GM�2�Ca t o, P1�JC p(�`�kYY f OhC G�k�7
Upstream Location _Ct&l tP
Downstream k LocationLLL6wni,' -0,5 ,;?c-�i l
Effluent
Characteristics
Summer
Winter
BOD5 (mg/1)
30
NH3-N (mg/1)
f
l�
D.O. (mg/1)
TSS (mg/1)
F. Col. (/100 ml)
0?0 0
c;20 6
PH (SU)
�0_cb,b,
nments: s

Request No.: 5578
------------------- WASTELOAD ALLOCATION APPROVAL FORM -------------------
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Quad:
Mr. Thomas M.
NCO061204
Domestic
Existing
Renewal
ut Mill Creek
C
030704
Forsyth
WSRO
Rosanne Barona
2/9/90
C18NW
Alphin/Scarlett Acres MHP
► 1V
MAY 15 i990
PE?`IDran`ageq"'area:
0.220
sq mi
Summer
7Q10:
0.00
cfs
Winter
7Q10:
0.07
cfs
Average
flow:
0.23
cfs
30Q2:
0.08
cfs
-------------------- RECOMMENDED EFFLUENT
LIMITS
New Limits
Summer
Winter
Wasteflow (mgd):
0.024
0.024
BOD5 (mg/1) :
16
30
NH3N (mg/1) :
12
NR
DO (mg/1):
6
6
TSS (mg/1):
30
30
pH (su) :
6-9
6-9
Fecal Coliform (/100ml):
200
200
--------------------------
Existing Limits
Summer Winter
0.024 0.024
16 30
12 NR
6 6
30 30
6-9 6-9
1000 1000
Toxicity Testing Req.: Chronic/Ceriodaphnia/Quarterly<g�
---------------------------- MONITORING -----------------------------------
Upstream (Y/N): Y Location: above discharge location
Downstream (Y/N): Y Location: below discharge point at SR 2219
----------------------------- COMMENTS -----------------------------------
Recommend instream monitoring for DO, Temperature, Fecal Coliform, and
Conductivity. Facility will receive letter addressing chlorine toxicity.
Toxicity Test implemented due to effluent ammonia predicted to exceed
ammonia standard instream.
---------------------------------------------------------------------------
Recommended by: 041-f,& -t4a Date: S 7 76
Reviewed by
Instream Assessment:
Regional Supervisor:
Date:
Date:
Permits & Engineering: Date:
RETURN TO TECHNICAL SERVICES BY: JUN 0 6 1990

10/89
Facility Name I& l s���'C� �>��c!-eS Permit # rCUa (9 l ao�
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 M% (defined as treatment two in the North Carolina procedure
document). The permit holder shall perform quarte-rly monitoring using this procedure to establish
compliance with the permit condition. The first test will be performed after thirty days from
issuance of this permit during the months of Ah lkw. � AW Effluent
sampling for this testing shall be performed at the NPDES permitted final effluent 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 parameter
code TGP3B. Additionally, DEM Form AT-1 (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 chernical/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 performed by the North Carolina
Division of Environmental Management indicate potential impacts to the 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 4 cfs
Permited Flow 4 a aLP MGD
IWC% (06
Basin & Sub -basin $10
Receivin S tream 6 4- r i i l l C. b--e.l✓
County
Recommended by:
"Chronic Toxicity (Ceriodaphnia) P/F at .1 %, ek, l y. 4MW, See Part 3 , Condition .

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State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512. North Salisbury Street • Raleigh, North Carolina 27611
James G. Nlarlin, Governor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary June 19, 1990 Director
Mr. Thomas M. Alphin
Scarlett Acres MHP
5528 Old Walkertown Road
Walkertown, NC 27051
Subject: Chlorine Toxicity
NPDES Permit No. NCO061204
Forsyth County
Dear Mr. Alphin,
Chlorine, a widely used wastewater disinfectant for the treatment of coli-
form 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 environment
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 developed
an action level for chlorine of 17 ug/l (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 chlorine
for effluent disinfection. The Division is reviewing chlorine levels from all
existing dischargers as part of their NPDES permit renewal process.
Our records indicate that chlorine from your facility's effluent discharge
is considered toxic to the receiving stream under low flow conditions, i.e., the
amount of chlorine discharged caAes a violation of the instream action level
for chlorine (17 ug/1) under 7Q10 (the lowest consecutive 7 day average flow in
a 10 year period) conditions. 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/l`(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 alter-
nate disinfection should be included. However, please note that an authoriza-
tion to construct must be obtained from this Division prior to any alteration to
your treatment plant.
The Division is currently reviewing its water quality regulations pertain-
ing to chlorine. In the future, effluent limits and/or dechlorination may be
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
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required of existing facility's with chlorine problems. If the chlorine levels
in your facility's effluent remain unchanged, a chlorine limit or a whole efflu-
ent toxicity testing requirement may be added to your permit limitations.
Please feel free to call Steve Mauney of the Division's Regional Office at
[phone], if you have any questions or comments regarding this issue.
SWT/CMS
cc: Winston-Salem Regional Office
Central Files
WLA File
s
Sincerely,
Steve Tedder
Water Quality Section Chief