NC0083828_Staff Report_19940414

NPDES DOCUMENT 5CANNINO COVER SHEET
NC0083828
J . Mackintosh WTP
NPDES Permit:
Document Type• r//
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Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Staff Report)
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Permit
History
Document Date:
April 14, 1994
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DATE: April 14, 1994
Page 1 of 4
DEM-Water Quality Section
SOC Project: Yes No_X_ If yes, SOC No.
**** Attention: Review Engineer: Jay B. Lucas ****
Supernatant Discharge from WTP-Discharge PERMIT: AC0083828
STAFF REPORT AND RECOMMENDATIONS
County: Alamance
PART I -GENERAL INFORMATION
1. Facility and Address: Facility: City of Burlington's Lake
Mackintosh WTP, 3400 Harris Road, Burlington, NC
Mailing Address: Mr. W.R. Baker, City Manager, City of
Burlington, P.O. Box 1458, Burlington, NC 27216
2 Date of On -Site Investigation: March 8, 1994. On site
inspection conducted with Tom Muir -Chief Operator.
3. Report Prepared by: Arthur R. Hagstrom, Environmental
Engineer, DEM, WSRO, WQ.
4. Persons Contacted and Telephone Number:
A. D. Isley, Chemist, with City of Burlington 910-584-1393
Tom Muir, Chief Operator, Mackintosh WTP 910-584-1393
5. Directions to the site: Exit I-40/85 at Elon College Exit
and go south on Huffman Mill Road (3 1/2 +/- miles) and turn
left on Harris Road and go to the WTP.
6. Site size and expansion area consistent with application?
_X_ Yes _ No. If No, explain:
7. Topography (relationship to the 100 year flood plain
included): In front of dam for the lake for the discharge
and on graded area at near top for the input. Input is not
in flood prone area. Discharge will be downstream from
future turbine:

Mackintosh WTP/Supernatant AC0083828
March 11, 1994
Page 2 of 4
8.The discharge location is near:
Latitude: 36 deg 02' min 28 sec
Longitude: 79 deg 30 min 08 sec +/- Elevation: 490' +/-
A Marked USGS map showing treatment facility site is
attached. USGS Quad No.C21SE/ USGS Quad Name Gibsonville
8. Location of nearest dwelling: Over 1000 feet
9. Watershed Stream Basin Information: Will go into Big
Alamance Creek
a. Watershed classification: Class "C-NSW "
b. River Basin and Subbasin: Cape Fear/ 03-06-03
c. Discharges of supernatant will go directly into the
surface water. The downstream goes to the Haw River south of
the Burlington area.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. The existing WTP has to dispose of supernatant from its
sludge basins. This new transfer system will provide an
appropriate way.
a. What is the current permitted capacity of the facility?
450,000 GPD (Ultimate Design Capacity) +/- NOL
b.The daily discharge flow from the new lagoons for the WTP
is estimated at.450 MGD+/-. When this A to C is completed.
c. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two (2)
years: N/A
d.What is the actual treatment capacity of the current
facility design? .450 MGD per design from sludge
from back washing filters and washdown of settling basins.
d.Please provide a description of existing or substantially
constructed wastewater treatment facilities: The WTP is in
need of the tansfer system that will be provided by this A
to C. The system will pump or gravity drain the supernatant
to an existing surface storm drainage system.
2.Please provide a description of proposed wastewater
treatment facilities: Add piping, valves, and pumps to
enable discharge of supernatant.

Mackintosh WTP/Supernatant AC0083828
April 11, 1994 .
Page 3 of 4
3.Residuals handling and utilization/disposal scheme:
On -site storage in existing sludge ponds.
a.If residuals are being land applied, please specify DEM
permit No. N/A
b.Residuals stabilization: PSRP: N/A PFRP: N/A
Other: Settling and dewatering by decanting.
Landfill: N/A
d. Other disposal/utilization scheme (Specify): When
removal is needed the entire operation will be contracted
out.
4. Treatment plant classification (attach completed rating
sheet): Class " I ", 10 points
5.SIC Code(s): 4941
Wastewater Code(s) of actual wastewater, not particular
facilities:
Primary 21 Secondary N/A
.Main Treatment Unit Code: 5 0 0 X 0
6.Important SOC, JOC or Compliance Schedule dates: (Please
indicate): None pate N/A
Submission of Plans and Specifications
Begin Construction
Complete Construction
Part III -Other Pertinent Information
1. Is this facility being constructed with Construction
Grant Funds (municipals only) ? No
2. Special monitoring requests: No
3. JOC or SOC dates: None
4. Other Special Items: The future City disposals of alum
sludges will be contracted.

Mackintosh WTP/ Supernatant AC0083828
April 11, 1994
Page 4 of 4
PART III - EVALUATION AND RECOMMENDATIONS
The WSRO recommends that the system upgrade be permitted as
requested.
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Arthur R. HagstrO Preparer
Water Quality Super isor
Q Y p
Date