NC0074233_Wasteload Allocation_19950404

NPDES WASTE LOAD ALLOCATION
PERMIT NO.. NC0074233
PERMITTEE NAME: Catawba County Board of Education
FACILITY NAME: Blackburn Middle School
Facility Status: Existing
Permit Status: Renewal
Major
Pipe No.: 001
Minor `I
Design Capacity: 0.015 MGD
Domestic (% of Flow): 100 %
Industrial (% of Flow):
Comments:
RECEIVING STREAM: Haas Creek
Class: C
Sub -Basin: 03-08-35
Reference USGS Quad: E13SE (please attach)
County: Catawba
Regional Office: Mooresville Regional Office
Previous Exp. Date: 7/31/94 Treatment Plant Class: I
Classification changes within three miles:
Requested by: Charles Alvarez Date: 1/3/94
Prepared b Date: y 3
Review b . Date: `f 4
o 7Z S 4l
Modeler
Date Rec.
#
J:SAA
%?OG
Drainage Area (mi ) o, y6 Avg. Streamflow (cfs): 0 6 0
7Q10 (cfs) 0. /-r Winter 7Q10 (cfs) o• /s 30Q2 (cfs) e.zo
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring: IVe
Parameters
Upstream Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BOD5 (m )
30
3e
NH3-N (mg/1)
D.O. (mom)
h✓
h✓
TSS (mg/l)
30
.70
F. Col. V100 ml)
Z06
ZOO
pH (SU)
.ents: �'�°"- G�� s......,,, s (.y, c "V117 7sw'

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:
FACT SHEET FOR WASTELOAD ALLOCATION
Blackburn Middle School
NCO074233
Domestic - 100%
Existing
Renewal
Haas Creek
C
030835
Catawba
Mooresville- ',aFc
Alvarez
1/4/94
E13SE
Request# 7706
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
0.46
Summer 7Q10 (cfs):
0.15
Winter 7Q10 (cfs):
0.15
Average Flow (cfs):
0.60
30Q2 (cfs):
0.20
IWC (%):
13
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Facility requesting renewal of existing permit. Recommend renewal of existing limits and facility
should be given NH3 Choice Option of summer/winter limits of 6 & 12, respectively or chronic
toxicity testof 13%. Fat,jt &/ 5hoold ham laeevt vsv CTB36 e5TRt:*fKLINf-
PaIKcql, ho46iNU U)bgwasndpe6kd r�x,-aKWq, .*ij ttW
n
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:
Reviewed by
Instream Assessment
Regional Supervisor:
Permits & Engineerin
12,
RETURN TO TECHNICAL SERVICE BY:
VIM T,Hg
ONMENALT
& NATURAL RESOURCES
MAR 8 1995
APR 0 2 M5
3NVINI OF ENVIRONMENTAL MANAGEMENT
MOORE'14E.REO/gam OFnrr

CONVENTIONAL PARAMETERS
Existing Limits:
Monthly Average
Summer Winter
Wasteflow (MGD):
0.015
BOD5 (mg/1):
30
NH3N (mg/1):
monitor
DO (mg/1):
nr
TSS (mg/1):
30
Fecal Col. 000 ml):
1000
pH (SU):
6-9
Residual Chlorine (µg/l):
monitor
Temperature (C):
monitor
Recommended Limits:
Monthly Average with Monthly Average with
Toxicity Test
Ammonia
Limit
Summer Winter
Summer
Winter WQ or EL
Wasteflow (MGD):
0.015
0.015
0.015
BOD5 (mg/1):
30
30
30
NH3N (mg/1):
monitor
6
12
DO (mg/1):
nr
nr
nr
TSS (mg/1):
30
30
30
Fecal Col. (/100 ml):
200
200
200
pH (SU):
6-9
6-9
6-9
Residual Chlorine (µg/1):
monitor
monitor
monitor
Temperature (C):
monitor
monitor
monitor
Toxicity test (P/F):
Chronic Ceriodaphnia @ 13 %
Limits Changes Due To: Paramet ,�) Affected
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures Fecal Coliform, NH3
New facility information
Parameter(s) are water quality limited For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
No parameters are water quality limited, but this discharge may affect future allocations.

3
INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISC -T T -ANEOUS INFORMATION & SPECIAL CONDITIONS
Adgquacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
N yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Wasteload sent to EPA? (Major) (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 it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

l0 East 25th Street • Newton, North Caro7ma 28658 • 704-464-8333
n ^ March 24, 1995
Kim H. Colson, P.E.
N. C. Division of Environmental Management
Q1Q n!. Main St.
Mooresville, NC 28115
Dear Kim:
J
Subject: Proposed Wasteload Allocation
Blackburn Middle School
NPDES Permit No. NCO074233
Catawba County, NC
As per letter of March 10, 1995, concerning wasteload allocations, I
choose NH3-N limits.
Yours truly,
Mark Bumgarner
Directer of Maintenance
Catawba County Schools

BLACKBURN MIDDLE SCHOOL
HAAS CREEK C
030835
JMN
12/27/94
Facility requesting renewal of existing NPDES permit. Current limits are secondary w/
fecal coliform limit of 1000. Will revise fecal limit to 200/100m1. School has an average
fecal concentration of 78/100ml. School is also averaging 10,000 GPD discharge,
approx. 67% capacity.
NH3 toxicity review indicates that facility should be given NH3 choice option between
summer & winter NH3 limits of 6 and 12 mg/l, respectively, or a chronic toxicity test @
13%. Current average NH3 concentration is 4.4 mg/l. It would appear that school could
meet the s/w tox limits of 6 & 12 easily.
Background
Blackburn School initially requested a NPDES permit in 1988 to convert from a non -
discharge system to a discharging sand filter system. There was some confusion about the
proposed discharge point and three wasteloads were done for this school, one at UT Haas
Creek, two direct discharges to Haas Creek. P&E and MRO straightened out the correct
receiving stream and a wasteload allocation was finalized in 6/89 for the current discharge
point.
RECOMMENDATION
Facility should renew existing limits w/ NH3 Choice Option given of
summer & winter NH3 limits of 6 & 12, respectively or Chronic
Ceriodaphnia -Toxicity Test @ 13%.

11-1 wilt 1, E- 1 1 Ii TA i k, . 1.5015K
Residual Chlorine
Ammonia as NH3
(summer)
7010 (CFS)
0.15
7010 (CFS)
0.15
DESIGN FLOW (MGD)
0.015
DESIGN FLOW (MGD)
0.015
DESIGN FLOW (CFS)
0.02325
DESIGN FLOW (CFS)
0.02325
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 (%)
13.42
IWC (%)
13.42
Allowable Concentration (ug/1)
126.68
Allowable Concentration (mg/1)
6.03
Ammonia as NH3
(winter)
7010 (CFS)
0.15
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
0.015
Ratio of &5 :1
DESIGN FLOW (CFS)
0.02325
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
13.42
Allowable Concentration (mg/l)
11.99
NCO074233 12/27/94

To: Permits and Engineering Unit
Water QualitySection
Attention:4'0-'@Lx
1s:A1-va r e z
SOC PRIORITY PROJECT: No
Date: December 6, 1993
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Catawba
NPDES Permit No.: NC0037'a 3.3
MRO No.: 93-264
PART I - GENERAL INFORMATION
1. Facility and Address: Blackburn Elementary School
`-Tc/o Catawba County Board of Education
Post Office Box 1000
Newton, N.C. 28658
2. Date of Investigation: November 2, 1993
3. Report Prepared By: Michael L. Parker, Environ. Engr. II
4. Person Contacted and Telephone Number: Mark Bumgarner,
[phone].
5. Directions to Site: Blackburn School is located in the
southeast quadrant of the jct. of NC Hwy. 10 and SR 2030
(Old State Rd.)
6. Discharge Point(s), List for all discharge Points: -
Latitude: 35° 36' 46"
Longitude: 81' 20' 05"
Attach a USES Map Extract and indicate treatment plant site
and discharge point on map.
USES Quad No.: E 13 SE
7. Site size and expansion area consistent with application:
Yes,
8. Topography (relationship to flood plain included):
9. Location of Nearest Dwelling: Approx. 500+ feet from the
WWTP site.

a
Page Two
10. Receiving Stream or Affected Surface Waters: Haas Creek*
Permit currently lists receiving stream as Haas Branch.
This should be changed.
a. Classification: C
b. River Basin and Subbasin No.: Catawba 030835
C. Describe receiving stream features and pertinent
downstream uses: Flow observed in receiving stream (1-
3 feet wide x 3-6 inches deep) at the time of the site
inspection. The area is generally rural with
agriculture being the primary use. There are no other
dischargers and/or water intakes within one mile below
this discharge.
�• w
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater: 0.0149 MGD (Design Capacity)
b. What is the current permitted capacity: 0.015 MGD
C. Actual treatment capacity of current facility (current
design capacity): 0.0149 MGD
d. Date(s) and construction activities allowed by previous
ATCs issued in the previous two years: N/A
e. Description of existing or substantially constructed
WWT facilities: The existing WWT facilities consists of
a septic tank followed by a recirculating sand filter,
a recirculation tank, tablet disinfection and cascade
aeration.
f. Description of proposed WWT facilities: N/A
g. Possible toxic impacts to surface waters: Chlorine is
added to the waste stream.
h. Pretreatment Program (POTWs only): Not Needed.
2. Residual handling and utilization/disposal scheme: Septage
is removed by a contract hauler and disposed of at a City of
Hickory WWTP.
3. Treatment Plant Classification: Less than 5 points; no
rating (include rating sheet). Class I
4. SIC Code(s): 8211
Wastewater Code(s):
Primary: 03
Secondary: N/A
5. MTU Code(s): 45007

Page Three
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved (municipals only)?
No
2. Special monitoring or limitations (including toxicity)
requests: None at this time,
3. Important SOC/JOG or Compliance Schedule dates: N/A
4. Alternative Analysis Evaluation
a. Spray Irrigation: Insufficient area available.
b. Connect to regional sewer system: None available.
C. Subsurface: Insufficient area available.
d. Other disposal options: N/A
PART IV - EVALUATION AND RECOMMENDATIONS
CatAwba County schools requests renewal of the subject
Permit. There have been no changes and/or modifications to this
facility since the Permit was last issued. The existing facility
was in excellent operational condition at the time of the site
inspection.
It is recommended that the Permit be renewed as requested.
z l4e, - � 12 —� --f-3
Si ature of Report Preparer Date
- /� , /?-, Cz 1z 611.,92
Water Quality Regional Supervisor Date

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