NC0028711_Wasteload Allocation_19930204

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0028711
Berryhill Elementary
WWTP
Document Type:
Permit Issuance
.‘-*4'.
Tasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Correspondence
Speculative Limits
Instream Assessment (67b)
Environmental Assessment (EA)
Permit
History
Document Date:
February 4, 1993
Thlus document is printed oa reu,se paper - ignore any
couterat ciam. the reYersce side

MEMORANDUM
TO: Coleen Sullins
THRU:
DIVISION OF ENVIRONMENTAL MANAGEMENT
Trevor Clemente.
Ruth SwanekR25
Carla Sanderson
February 4, 1993
eni 4...
tee
ROM: Jacquelyn M. Nowe1 1,(JN
SU._JECT: Revision of Effluent Limits for E rryhi 11 Elementary
NPCtES Permit No. NC0O28711 03083�
Meoklenburg County Lak CJctvi
Technical Support has reviewed the request from the subject __i i ity
regarding • .vision c f the effluent limitations for„D -
�_'V•al!':�t1�Jt?��.?T'�le self monitoring G _• and %i-:: After mil
ng data collected ec�ted by the school end the :.. 31
staff r'epor't , the facility appears to be well operated. T'
never exceeded 25 niy 1 and NH3 values were con. -tent 1
limit of 9 mg/1 and the requested limit of 6 mg/i, T t.• 1y
dure for di schar"gers to streams with 7 Q1D=O and 3OQ2 'O • equ i r_
renewal of existing limits. The Berryhill School's r.. _. que.t for. athe limits would have almost ultimate _ equivalent u�T'1me ROD, t:her=:+[Zi =
�•upport r� .:ommends the current limits t_ be revised. The " � thats� „_ new i
limits should be as follows:
itOCR5
NH3-N
DO
pH
Chlorine
5 mg/1
6 mg/1
5 me/1
20
monitor
The facility should be made aware that the Laid Wylie
that -
statesall existing dischargers to the lake m.W;i ns': Jm a:r=..
should be encouraged to be removed when alternatives
alternative that could he reviewed by E=rryhi1 i .::hoo1
s tier line extension project.
If there are any questions, please vont:a•::t me,
cc: Rex Gleason
on
Mack Wiggins
Central Files
WLA Files

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1170/
DIVISION OF ENVIRONMENTAL MANAGEMENT
August 27, 1992
MEMORANDUM TO: Colleen Sullins
FROM:
PREPARED BY: Richard Bridgeman
SUBJECT:
`V
D. Rex Gleason 1)
Request for Permit Revision/Effluent Limits
Charlotte -Mecklenburg Schools/Berryhill Elementary
NPDES Permit No. NC0028711
Mecklenburg County
Enclosed please find a copy of a response to a Compliance
Evaluation Inspection Report, in which the Permittee makes a
request to modify effluent limits for BOD5 and NH3, and presents a
supporting argument for the request.
MRO defers to the Technical Support Branch on this matter, and
will support their recommendation.
Please advise if you need further information or action.
Enclosure
RMB

Charlotte -Mecklenburg Schools
Maintenance Department
3101 Wilkinson Boulevard
Charlotte, North Carolina 28208
Telephone [phone]
Pr
August 17, 1992
Mr. D. Rex Gleason, P.E.
Water Quality Regional Supervisor
State of North Carolina
Department of Environment, Health, and
Mooresville Regional Office
919 North Main Street
Mooresville, North Carolina 28115
SUBJECT:
Request for Effluent Limits
Change NPDES NCOO 28711
Berryhill Elementary School
Dear Mr. Gleason:
b 0,"
Y ft-
John A. Murphy
1 Superintendent
rarra
OF NATU�L
RESOURCES
0)Iy DEVE
AUG 2 01992
StOA OF Vtv1ROW110.�tCE
waaRaIIuE a � � 01
Natural Resources
In response to the July 7, 1992 Compliance Inspection Report,
concerning elevated BOD5 concentrations between July 1991 and
February 1992, the following procedural changes have been
initiated:
1. The effluent structure to the chlorinator is hosed daily.
2. All sample containers will be rinsed with distilled water
prior to use.
3. Due to low waste concentrations during the summer months, a
nutrient compound is being added to maintain a proper biomass.
4. The custodial and cafeteria staff have been asked to reduce
disinfectant use to an absolute minimum.
These changes should improve our treatment performance and ensure
that representative sampling is maintained. Also, any information
that your organization has concerning supplemental nutrient
addition would be appreciated.
In addition to these changes, I am requesting that our effluent
limits for BOD5 and ammonia nitrogen be changed to more closely
reflect our operating conditions.
When using the modeling equation to determine ultimate Biochemical
Oxygen Demand (BODu) for small domestic waste dischargers, I find
that even though we may violate our existing BOD5 limit, we are not
close to violating the BODu. To illustrate this statement,
Administrative Offices Education Center 701 East Second Street

August 17, 1992
Page 2
attached is a study of the data for each month from January 1990 to
June 1992 using the modeling formula for BODu.
We are hereby requesting that our limits for BOD5 and ammonia
nitrogen be changed from 17 mg/L and 9 mg/L to 25 mg/L and 6 mg/L,
respectively. Based on our calculations, this ratio is more
suitable to our actual operating conditions than the ratio in our
existing NPDES permit.
If you have any further questions, please do not hesitate to call
me.
Sincerely,
,
arvey F. humpert, Jr
Director
Attachment

BODu Equation
BODu = 1.5 BOD5(mg/L) + 4.5 NH3-N(mg/L)
Permitted BODu(mg/L) = 66
Date
Reported
BOD5(mg/L)
Reported
NH3-N(mg/L)*
Calculated
BODu(mg/L)
1990:
January 11. 1 21.0
February 25 1 42.0
March 12 1 22.5
April 13 1 24.0
May 14 1 25.5
June 12 1 22.5
July 11 1 21.0
August 18 1 31.5
September 19 1 33.0
October 20 3.05 43.7
November 17 1 30.0
December 16 1 28.5
1991:
January 14 1 25.5
February 13 '1 24.0
March 11 1 21.0
April 12 1.31 23.9
May 13 1 23.5
June 13 1 23.5
July 25 1 42.0
August 14 1 25.5
September 19 1 33.0
October 17 1 30.0
November 16 1 28.5
December 19 1 33.0
1992:
January 14 1 25.5
February 18 1 31.5
March 15 1 27.0
April 11 1 21.0
May 16 1 28.5
June 21 1 36.0
*A11 less than 1 values are calculated as 1 mg/L