NC0023973_wasteload allocation_19910225

NPDC:C DOCUMENT SCANNINO COVER :itliEET
NPDES Permit:
NCO023973
Wilmington - Southside WWTP
Document Type:
Permit Issuance
asteload Allocation
Authorization to Construct (AtC)
Permit Modification
Engineering Alternatives Analysis
201 Facilities Plan
Instream Assessment
Correspondence re: draft permit
Permit History
Date Range:
Document Date:
February 25, 1991
THIS DOCYNENT IS PRINTED ON REUSE PAPER - ICNORE ANY CONTENT ON THE
REVERSE SIDE

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO023973
PERMITI'EE NAME: City of Wilmington / M'Kean Maffitt WWTP
Facility Status: Existing
Permit Status: Renewal
Major _q Minor
Pipe No.: 001
Design Capacity:
12.0 MOD
Domestic (% of Flow):
Industrial (% of Flow):
Comments:
97.2 %
2.8 %
RECEIVING STREAM: the Cape Fear River
Class: SC
Sub -Basin: 03-06-17
Reference USGS Quad: K27NW (please attach)
County: New Hanover
Regional Office: Wilmington Regional Office
Previous Exp. Date: 6/30/91 Treatment Plant Class: Class 4
Classification changes within three miles:
none
Requested by: Rosanne Barona
Prepared by:
Reviewed by: 66
-Zofl„` 135
wck1e_ _ _
Date: 1/15/91
.,_._. n /o.) /o r
Modeler
Date Rec.
#
t l�
9 I
beo
Drainage'Area (mil ) MOO Avg. Streamflow (cfs):
7Q10 (cfs)// `f q Winter 7Q10 (cfs) 30Q2 (cfs)
Toxicity Limits: IWC l. 6 qo Acut Chronic
.4c✓k r Y ArAr } iY. j fnr In ti /M�. 1.1i '1064
InstreamMomtoring: mot, w� D,P� TuI.X
Parameters
Upstream Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BOD5 (m )
30.0
NH -N (mg/1)
3
�t
/,�"'0 y) 4-p,
D.O. (mg/1)
Mon; 4 r
TSS (mg/1)
30.0
F. Col. (/100 nil)
a00. 0
(/SU)�t,
G. 0 — C?. 5
/MpH
_
Chromium �o r
47
N; �!kl, Leal, z.•.

FACT SHEET FOR WASTELOAD ALLOCATIONS
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
Request 11 6004
City of Wilmington/M'Kean Maffitt
NC0023973
Domestic: 97.2% Industrial: 2.8%
Existing
Renewal
Cape Fear River
SC
03-06-17
New Hanover Stream Characteristic:
Wilmington USGS 11 T�u�l
RosanneBarona Date:
Hb ` 1991
WiL..!,-'on {;- Tonal Cff;ce
1/15/91 Drainage Area: 8800 mil
K27NW Summer 7Q10: 1149 cfs F %V*ov-�9( flew
Winter 7Q10:
Average Flow:
30Q2:
Wasteload Allocation Summary
- Limits for conventional parameters were renewed at their present
levels. These parameters will be reevaluated at the next permit
renewal, once the Basin Management Plan has been finalized and
implemented.
- After consultation with Ed Beck of the Wilmington Regional Office, the
pH limit has been changed from 6.8 - 8.5 to 6.0 - 8.5.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: �"7`"— Date: IIAPl9l
Reviewed by
Instream Assessment
Regional Supervisor
Permits & Engineering
ALL k D. &ol Date: I ZY q
Date: S V
Date: 9&/—,(
RETURN TO TECHNICAL SERVICES BY:
FEB 2' 1991

- 2 -
Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1)":
Fecal Col. (/100 ml):
pH (SU):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Recommended Limits:
CONVENTIONAL PARAMETERS
Monthly Ave.
Summer Winter
12.0
30.0
30.0
200.0
6.8-8.5
Monthly Ave.
Summer Winter
Wasteflow (MGD):
12.0
BOD5 (mg/1):
30.0
NH3N (mg/1) :
Mon' Oc
DO (mg/1):
MoRi+6C
TSS (mg/1):
30.0
Fecal Col. (/100 ml):
200.0
pH (SU):
6.0-8.5
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Limits Changes Due To: Parameter(s) Affected
Instream Data
Ammonia Toxicity
Chlorine
Nutrient Sensitive Waters
HQW
New 7Q10 flow data
Special Modeling Studies
New facility information
Other
(explanation of any modifications to past modeling analysis
including new flows, rates, field data, interacting discharges).
(See page 4 for Miscellaneous and special conditions if apply)

- 3 -
TOXICS
Toxicty Limit Monitoring Schedule
Existing Limit:
IWC 1.6%
Jun., Sept., Dec.,
Mar.
Recommended Limit:
IWC 1.6%
t, Dec.,
Jun., S7?-q'hr-
Mar.
ACUAe- �a'i%lt
K(NAOWNo
5;9n���cct��
Toxics
or metals limits
Existing Limits:
Monitoring
Requirements
Measurement
Frequency
Cadmium (ug/1):
Chromium (ug/1):
Monthly
Copper (ug/1):
Monthly
Nickel (ug/1):
Monthly
Lead (ug/1):
Monthly
Zinc (ug/1):
Monthly
Cyanide (ug/1):
Monthly
Phenols (ug/1):
Mercury (ug/1):
Silver (ug/1):
Chlorine (ug/1):
Recommended Limits: Monitoring Requirements
Measurement Frequency
Cadmium (ug/1):
Chromium (ug/1):
Monthly
Copper (ug/1):
Monthly
Nickel (ug/1):
Monthly
Lead (ug/1):
Monthly
Zinc (ug/1):
Monthly
Cyanide (ug/1):
Monthly
Phenols (ug/1):
Mercury (ug/1):
Silver (ug/1):
Monthly
Chlorine (ug/1):
Limits Changes Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
New pretreatment information
Failing toxicity test
Other
Parameter(s) Affected
x Silver

- 4 -
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Miscellaneous information pertinent to the renewal or new permit for
this discharge. Include relationship to the Basinwide management plan.
INSTREAM MONITORING REQUIREMENTS:
Upstream:
Downstream:
Parameters:
Location:
Location:
Special Instream monitoring locations or monitoring frequencies:
SPECIAL INSTRUCTIONS OR CONDITIONS
WASTELOAD SENT TO EPA?(Major) N_ (Y or N)
(if yes, then attach schematic, toxics spreadsheet, copy of model, or
if not modeled, then old assumptions that were made, and description
of how fits into basinwide plan)
Additional Information attached? Yes, Acute Toxicity Testing
Requirement.

Facility I -Jame (::�' lj7 of W"11`^ 4n L14411k+n A YW Iy 4'M'_1P Permit #
If/C 0 0 2717?
ACUTE TOXICITY TESTING REQUIREMENT (QRTRLY)
Fathead Minnow 24 hr - No SignificXn
ality
The permittee shall conduct acute toxicity tests on a r r sing protocols ed in the
North Carolina Procedure Document entitled "Pass/Fail MethFor Dete ing AcuteToxicity In A Single Effluent Concentration". The monitorine perfo as a Fathead
Minnow (Pimephales r m 1 24 hour static test using efflllec a 24 hourcomposite. The effluent concentrationat which there may be e cant acute mortality
in any two consecutive toxicity tests is 90% (defined as treatm' the North Carolinaprocedtire document). Effluent samples for self -monitoring pmust be obtained during
representative effluent discharge below all waste treatment. Ttest will be performed after
thirty days from issuance of this permit during the months o. 's ocC. '"A
All toxicity testing results required as p o rout didon ' entered on the Effluent
Discharge Monitoring Form (MR-1) for o th in ich it was ed, using the parameter
code TGE6C. Additionally, DEM (ori ' ) is t e followmg address:
Attentio ech s ch 1`
N lin ion Managemee
nt
al Box `
Raleigh, N.C.C. 27611
Test data shall be comp d to and t!f all suppo ch mica]/physical measurement
performed in ass oci th toxicity to well as all s ponse data. Total residual
chlorine of the effl i ' sample mu measured an re ed if chlorine is employed for
disinfection of the to am.
Should any s' u riy moni dicate a failure to meet specified limits, then monthly
monitorin e ' immediatel ch time that a single test is passed. Upon passing, this
monthly test(( ' ment w o quarterly in the months specified above.
Should any. data ther ese monitoring requirements or tests performed by the North
Carolina ' sion o nviro tal Management indicate potential impacts to the receiving stream,
this pe may be -opened and modified to include alternate monitoring requirements or limits.
NO Failure to achieve test conditions as specified in the cited document, such as minimum
co 1 organism survival and appropriate environmental controls, shall constitute an invalid test
will require immediate retesting(within 30 days of initial monitoring event). Failure to submit
uitable test results will constitute noncompliance with monitoring requirements.
7QI0 / / y4 cfs
Permitted Flow Ion• 0 MGD Recommended by:
IWC%a j--rT —
Basin & Sub -Basin 03- 06- 17
Receiving Stream Gann Fear /Z ~
County New Hww nvc- Date r/W/1l
"Acute Toxicity(Fathead Minnow 24hr) No Significant Mortality at 90%, In, ST-, Dec. Mar_ ,
rt 3 See Pa , Condition T-.
ti

WLA Notes
SRB
1/25/91
#6004
City Of Wilmington / M'Kean Maffit WWTP
NCO023973
- Wilmington has requested a renewal of their 12.0 MGD
permit. Existing limits for conventional parameters will be
renewed at present levels, any new limits will be assessed
once the lower basin model is completed -(next renewal).
- Metal limits will be revised if pretreatment information
indicates a need. -Industrial flow is 2.8%.
- Wilmington has requested that they be exempted from the
85% removal. Wilmington is presently adjudicating to change
% removal and this will be worked in the renewal when a
decision is made (Contact Rosanne Barona). Reg. 40 CFR
133.103 (d).
- Wilmington has -requested that they receive a pH range of
6-9 rather than the present.range of 6.8 - 8.5. The
receiving stream, the Cape Fear River, is classified SC and
the narrower range is appropriate. Two nearby ambient data
stations.provide estimates of pH in the Cape Fear River.
Ambient Stations:
02108736, Cape Fear River @ Channel Marker 55 @ Wilmington:
Ave. pH: 7.02 (1985-90, n=23)
02108757, Cape Fear River @ Chan. Marker'50 near Wilmington:
Ave. pH: 7.20 (1985-90, n=26)
Effluent -Data shows that pH ranges from 6.0 to 7.4. Ed Beck
of the Wilmington. regional Office suggests giving a range of
6.0 to 8.5. This range will still protect water quality and
will allow Wilmington to comply with this limit.
-Toxicity Requirement. Fathead Minnow Acute Toxicity was
recommended because the system is tidal.

O1/28/91 ver 3.1
Facility:
NPDES Permit.No.:
Status (E, P, or M):
Permitted Flow:
Actual Average Flow:
Subbasin:
Receiving Stream:
Stream Classification:
7010:
IWC:
Stn' d / Bkg
Pollutant AL Cone.
(ug/1) (ug/1)
Cadmium S
Chromium S
Copper AL
Nickel S
Lead S
Zinc AL
Cyanide S
Mercury S
Silver AL
Selenium S
Arsenic S
Phenols S
NH3-N C
T.R.Chlor.AL
Pollutant
Cadmium S
Chromium S
Copper AL
Nickel S
Lead S
Zinc AL
Cyanide S
Mercury S
Silver AL
Selenium S
Arsenic S
Phenols S
NH3-N C
T.R.Chlor.AL
5.0
20.0
3.0
8.3
25.0
86.0
1.0
0.025
0.10
71.00
50.00
NA
17.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Allowable
Load
(#/d)
62.50
250.01
31.25
64.85
312.51
767.89
8.93
0.16
0.83
443.77
312.51
T 0 X I C S R E V I E W
CITY OF WILMINGTON/M'KEAN MAFFITT WWTP
NC002373
E
12.0 mgd
6.7 mgd
3.0
CAPE FEAR RIVER I--------- PRETREATMENT DATA -------------- I ---- EFLLUENT DATA---- I
SC I ACTUAL PERMITTEDI I
1,149.O cfs I Ind. + Ind. + I FREQUENCY 1
1.59 $ I Domestic PERMITTED Domestic I OBSERVED of Chronicl
I Removal Domestic Act.Ind. Total Industrial Total I Eflluent Criteria I
I Eff. Load Load Load Load Load I Cone. Violationsl
I (#/d) (#/d) (#/d) (#/d) (#/d) I (ug/1) (#vio/#sam)l
I-------- -------- -------- -------- --------- -------- I -------- --------- I
I 5096 0.2 0.0 0.20 0.0 0.190 I I
I 5096 0.4 0.2 0.55 1.5 1.880 1 12.2 I I
* 40% 1.8 0.2 2.01 0.8 2.560 1 19.7 1 N
1 20% 0.4 0.1 0.41 2.3 2.640 I 10.0 I P
1 50% 0.4 0.2 0.52 2.3 2.640 1 12.0 I U
1 30% 5.4 0.8 6.16 0.4 5.770 1 47.7 1 T
I 309d 0.4 0.0 0.39 0.0 0.380 I I
I 0lk I I S
I 25% 0.4 0.2 0.59 0.4 0.740 I 1 E
I 0% I I C
I 0% I I T
I 0% I I 1
I 0% I I 0
I 0% I I N
I I I
I I I
I I I
ALLOWABLE PRDCT'D PRDCT'D PRDCT'D--------- MONITOR/LIMIT --------- 1--ADTN'L RECMMDTN'S--
Effluent Effluent Effluent Instream 1 Recomm'd
Cone. using using Cone. Based on Based on Based on 1 FREQUENCY INSTREAM
CHRONIC ACTUAL PERMIT using ACTUAL PERMITTED OBSERVED I Eff. Mon. Monitor.
Criteria Influent Influent OBSERVED Influent Influent Effluent 1 based on Recomm'd ?
(ug/1) (ug/1) (ug/1) (ug/1) Loading Loading Data I OBSERVED (YES/NO)
------------------------- ---------------------------------I-----------------
313.871 1.781 1.692 0.00 I
1255.484 4.897 16.737 0.19 Monitor I NCAC NO
188.323 21.474 27.350 0.31 Monitor Monitor Monitor I Monthly NO
521.026 5.840 37.606 0.16 Monitor Monitor Monitor I NCAC NO
1569.355 4.629 23.503 0.19 Monitor I NCAC NO
5398.581 76.778 71.917 0.76 Monitor Monitor I Monthly NO
62.774 4.861 4.736 0.00 Monitor Monitor I
1.569 0.000 0.000 0.00 I
6.277 7.879 9.882 0.00 Monitor Monitor I
4456.968 0.000 0.000 0.00 I
3138.710 0.000 6.000 0.00 I
0.000 0.000 0.000 0.00 I
0.000 0.00 1
1067.161 0.00 1
I
I

NPDES PREPRFATMFNT INFOFMTION REQUFST FORM
q/Dl0'rg/
FACILITY NAME: NPDFS NO. NCO
I
!REQUESTER: DATE: / / / 9/ REGION
r
I
a 9. ��
I
I
I
I
This
facility
has no SIUs and should not
have pretreatment language.
This
facility
should and/or is developing
a pretreatment program.
Please include the following conditions-
I
Program Development
Phase I due
I
Phase II due '
Additional Conditions
—/--�Mis
facility
is currently imple eating a
(attached)
pretreatment program.
Please include
the following conditions:
I
I
Program Implgnentation ;
Additional Conditions
(attached)
I
I
SIGNIFICANT INDUSTRIAL USERS' (SIUs) CONTRIBUTIONS
SIU FLOW - TOTAL:
I -
®. MGD '
p, I
- COMPO`'ITION: TEXTILE: 0, '(` t1GD
METAL FIN�ISHING: MGD
' OTHER: 1 `Ci' It MGD '
I
� I
I
HEA IORKS REVIEW
I
PARAMETER !�ARLE
----DAILY LOAD IN LBS/DAY DCMESTIC PERM�
Cd I
Cr 6 I ND( nog 5D
15�fi EllNi O
Pb — � C) co 2 , 2'�d 5 2®
Zn � CO. a ..� 6
.�' 3CN ® I,
Other
30
I � -
RECEIVED: —Ld/—w REVIEWED BY: RETIRNED-
_ _ I
44

MEMO
TO: „ c�jlegvv
DATE
,/z �4/ '�,
SUBJECT: "v L�—
C9,µ-QD�i�' % ✓ZIYrn�Qr�-J � �`-°- �'`'`.`z� Jt.P�¢'�`" I w��
(33, )0 3 (d
�v
North Carolina Department of Environment,
Wig' Health, and Natural Resources

Environmental Protection Agency
[49 PR 37006, Sept. 20, 1984; 49 PR 40405,
Oct. 16, 19841
fi 133.103 Special considerations.
(a) Combined sewers. Treatment
works subject to this part may not be
capable of meeting the percentage re-
moval requirementsestablished under
§§ 133.102(a)(3) and 133.102(b)(3), or
§§ 133.105(a)(3) and 133.105(b)(3)
during wet weather where the treat-
ment works receive flows from com-
bined sewers (i.e., sewers which are de-
signed to transport both storm water
and sanitary sewage). For such treat-
ment works, the decision must be
made on a case -by -case basis as to
whether any attainable percentage re-
moval level can be defined, and if so,
what the level should be.
(b) Industrial wastes. For certain In-
dust catriaT egories, the discharge to
navigable waters of BOD, and SS per-
mitted under sections 301(b)(1)(AM),
(b)(2)(E) or 306 of the Act may be less
stringent than the values given in
§§ 133.102(a)(1), 133.102(a)(4)(t),
133.102(b)(1), 133.105(a)(1),
133.105(b)(1) and 133.105(e)(1)(i). In
cases when wastes would be intro-
duced from such an industrial catego-
ry into a publicly owned treatment
works, the values for BOD, and SS in
§§ 133.102(a)(1), 133.102(a)(4)(1),
133.102(b)(1), 133.105(a)(1),
133.105(b)(1), and 133.105(e)(1)(i) may
be adjusted upwards provided that: (1)
The permitted discharge of such pol-
lutants, aE rI u a le to the industrial
category, would not be greater than
that which would bepermittedunder
sections 301(b)(1)(A)(t), 301(b)(2)(E) or
306 of the Act if such industrial cate-
gory were to discharge directly into
the navigable waters, and (2) the flow
or loading of such pollutants intro-
duced by the industrial category ex-
ceeds 10 permnLof the design flow or
oa mr—g 67 the publ c y oii wned_rr
ment works. When such an adjust-
ment is made, the values for BOD, or
SS in §§ 133.102(a)(2), 133.102(a)(4)(ii),
§ 133.102(b)(2), 133.105(a)(2),
133.105(b)(2), and 133.105(e)(1)(ii)
should be adjusted proportionately.
(c) Waste stabilization ponds. The
Regional Administrator, or, if appro-
priate, State .Director subject to EPA
approval, is authorized to adjust the
93-I33 0-87-3
§ 133.103
minimum levels of effluent quality set
.forth in § 133.105 (b)(1), (b)(2), and
(b)(3) for treatment works subject to
this part, to conform to the SS concen-
trations achievable with waste stabili-
zation ponds, provided that: (1) Waste
stabllzation ponds are the principal
process used for secondary treatment;
and (2) operation and maintenance
data indicate that the SS values speci-
fied in § 133.105 (b)(1), (b)(2), and
(b)(3) cannot be achieved. The term
"SS concentrations achievable with
waste stabilization ponds" means a SS
value, determined by the Regional Ad-
ministrator, or, if appropriate, State
Director subject to EPA approval,
which is equal to the effluent concen-
tration achieved 90 percent of the
time within a State or appropriate
contiguous geographical area by waste
stabilization ponds that are achieving
the levels of effluent quality for BOD,
specified in § 133.105(a)(1). [cf. 43 PR
552791.
(d) Less concentrated influent
wastewater for separate sewers. The
Regional Administrator or, if appro-
priate, State Director is authorized to
substitute either a lower percent re-
moval requirement or a mass loading
limit for the percent removal require-
ments set forth in §§ 133.102(a)(3),
133.102(a)(4)(iii), 133.102(b)(3),
102.105(a)(3), 133.105(b)(3) and
133.105(e)(1)(iii) provided that the
permittee satisfactorily demonstrates
that: (1) The treatment works is con-
sistently meeting, or will consistently
meet, its permit effluent concentra-
tion limits but its percent removal re-
quirements cannot be met due to less
concentrated influent wastewater, (2)
to meet the percent removal require-
ments, the treatment works would
have to achieve significantly more
stringent limitations than would oth-
erwise be required by the concentra-
tion -based standards, and (3) .the less
concentrated influent wastewater is
not the result of excessive I/I. The de-
termination of whether the less con-
centrated wastewater is the result of
excessive I/I will use the definition of
excessive I/I in 40 CPR 35.2005(b)(16)
plus the additional criterion that
inflow is nonexcessive if the total flow
to the POTW (i.e., wastewater plus
247

§ 133.104
inflow plus infiltration) is less than
275 gallons per capita per day.
149 FR 37006, Sept. 20, 1984, as amended at
50 FR 23387, June 3, 1985: 50 FR 36880,
Sept. 10, 19851
9 133.104 Sampling and test procedures.
(a) Sampling and test procedures for
Pollutants listed in this part shall be
in accordance with guidelines promul-
gated by the Administrator in 40 CFR
Part 136.
(b) Chemical oxygen demand (COD)
or total organic carbon (TOC) may be
substituted for BOD, when a long-
term BOD:COD or BOD:TOC correla-
tion has been demonstrated.
§ 133.105 Treatment equivalent to second.
ary treatment.
This section describes the minimum
level of effluent quality attainable by
facilities eligible for treatment equiva.
lent to secondary treatment
(i 133.101(g)) in terms of the param-
eters—BOD,, SS and pH. All require-
ments for the specified parameters in
Paragraphs (a), (b) and (c) of this sec-
tion shall be achieved except as pro-
vided for in § 133.103, or paragraphs
(d), (e) or (f) of this section.
(a) BOD,. (1) The 30-day average
shall not exceed 45 mg/l.
(2) The 7-day average shall not
exceed 65 mg/1.
(3) The 30-day average percent re-
moval shall not be less than 65 per-
cent.
(b) SS. Except where SS values have
been adjusted in accordance with
§ 133.103(c).
(1) The 30-day average shall not
exceed 45 mg/l.
(2) The 7-day average shall not
exceed 65 mg/l.
(3) The 30-day average percent re-
moval shall not be less than 65 per-
cent.
(c) pH. - The requirements of
§ 133.102(c) shall be met.
(d) Alternative State requirements.
Except as limited by paragraph (f) of
this section, and after notice and op-
portunity for public comment, the Re-
gional Administrator, or, if appropri-
ate, State Director subject to EPA ap-
proval, is authorized to adjust the
minimum levels of effluent quality set
forth in paragraphs (a)(1), (a)(2),
40 CFR Ch. 1 (7-1-87 Edition
(b)(1) and (b)(2) of this section fe
trickling filter facilities and in part
graphs (a)(1) and (a)(2) of this sectio:
for waste stabilization pond facilities
to conform to the BOD, and SS efflt
ent concentrations consistently achiel
able through proper operation an
maintenance (§ 133.301(f)) by - tii
median (50th percentile) facility W-.
representative sample of facilitie
within a State or appropriate contiga
ous geographical area that meetth
definition of facilities eligible fo
treatment equivalent to secondar,
treatment (§ 133.101(g)).
(The information collection requirement
contained in this rule have been approve.
by OMB and assigned control number 2040
0051.)
(e) CBOD, limitations:
(1) Where data are available to es
tablish CBOD, limitations for a treat
ment works subject to this section, thi
NPDES permitting authority may sub
stitute the parameter CBOD, for thi
Parameter BOD, In §§ 133.105(a)(1)
133.105(a)(2) and 133.105(a)(3), on i
case -by -case basis provided that thi
levels of CBOD, effluent' quality an
not less stringent than the following:.,
(i) The 30-day average shall not
exceed 40 mg/l.
(ii) The 7-days average shall not
exceed 60 mg/1.
(lii) The 30-day average percent re
moval shall not be less than 65 per
cent.
(2) Where data are available, the pa
rameter CBODs may be used for efflu
ent quality limitations establishes
under paragraph (d) of this section
Where concurrent BOD effluent date
are available, they must be submitted
with the CBOD data as a part of the
approval process outlined in pars.
graph (d) of this section.
(f) Permit adjustments. Any permit
adjustment made pursuant to this
part may not be any less stringent
than the limitations required pursuant
to § 133.105(a)-(e). Furthermore, per-
mitting authorities shall require more
stringent limitations when adjusting
Permits if: (1) Par existing facilities
the permitting authority determines
that the 30-day average and 7-day av-
erage BOD, and SS effluent values
that could be achievable through
248