NC0025305_Historical information_20071231

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VICE HANCELLOR FOR FINANCE & ADMINISTRATION
UNIVERSITY OF NC AT CHAPEL HILL
300 SOUTH BUILDING, CB# 1000
CHAPEL HILL NC 27599-1000
20.IULY2007 SURFACE HOBAN NCOO253O5 ORANGE CO
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MR. RICHARD MANN
VICE HANCELLOR FOR FINANCE & ADMINISTRATION
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300 SOUTH BUILDING. CB# 1000 ( / (&
CHAPEL HILL NC 27599-1000 (
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MR RICHARD MANN
VICE CHANCELLOR FOR FINANCE & ADMINISTRA TION
UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL
300 SOUTH BUILDINC, CB 1000
CHAPEL HILL, NC 27599-1000
C. I. ORANGE. CO. NC0025305.6/26/07. SWP. AH
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MR. RICHARD MANN
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UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL
300 SOI JTH BUILDING, CB # 1000
CHAPEL HII.L, NC 27599-1000 | J DO
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OPERATIONS SUPERINTENDENT
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acdenri
North Carolina Department ol ®
Environment and Natural Resources
^^s~r D b P& £)
Facilities Services - Cogeneration Systems
. !
Request for SWIS Exemption
March 2007
Cogeneration Plant
Steam Tunnel Replacement
Bid Package 2: Tunnel Replacement
University of North Carolina
at Chapel Hill
March 6,2007
Subject:
Dear Ms. Burke:
■ Release Rate Management;
■ Volume Management;
■ Water Quality Management;
■ Nutrient Loading Calculations;
■ Maintenance and Operation Plan; and
■ Stormwater Management Facilities.
consulting •engineering - construction - operations
5400 Glenwood Avenue, Suite 300
Raleigh, North Carolina 27612
tel: [phone]
fax: [phone]
Sue Burke, P.E., C.F.M.
Stormwater Engineer
Town of Chapel Hill
209 N. Columbia St.
Chapel Hill, NC 27514
University of North Carolina at Chapel Hill
Facility Services - Cogeneration Systems
Cogeneration Plant Steam Tunnel Replacement
Bid Package 2: Tunnel Replacement
UNC Steam Tunnel Request for SWIS Exemption
These information requirements are detailed in Sections 5.4.4 and 5.4.5 of the Land Use
Management Ordinance and in Appendix 2-G of the Town's Engineering Design Manual.
Guidelines for submitting a "mini-SWIS" are discussed in the SWIS Exemption and
Stormwater Facility Waiver Process, which CDM obtained from the Town Stormwater
Engineer. The remainder of this document is intended to function as the Site Analysis and
This letter is to request a waiver by the Town Manager for a comprehensive Stormwater
Impact Statement (SWIS) and, also, present a "mini-SWIS" relating to the UNC Cogeneration
Plant Steam Tunnel Replacement (Project). The SWIS exemption request relates to the
following information requirements:
COM
1.
2.
3.
4.
5. Ability of natural drainage channel to convey additional volume, discharges, and
velocities;
6.Potential mitigation measures; and
I;
SWTS Exemption Request
March 6, 2007
Page 2
Site Analysis and Narrative
As recommended in Appendix 2-G of the Town's Engineering Design Manual, a pre­
application discussion was held between CDM and the town Stormwater Engineer on April
11, 2006. Since no significant change in hydrology or increase in impervious area is expected,
the town recommended that CDM apply for a SWIS exemption and complete a Site Analysis
and Narrative. The SWIS Site Analysis and Narrative requires information submittal on the
seven items listed below.
General Project Overview
CDM is working on a project to replace two existing tunnels (Tunnels 87 and 39) that pass
through the UNC campus and carry steam to the UNC Chapel Hill's Cogeneration Facility
(COGEN) facility. The structural integrity of these tunnels has degraded over time and a new
steam tunnel will be built to replace the old ones. Tunnel 87 will be demolished and replaced
Narrative, which makes up a "mini-SWIS". The justification for this request is that CDM
anticipates no significant change in pre-development hydrology resulting from the proposed
development.
Land use density, impervious surface area, and phasing;
Location, topography, on-site and off-site drainage conditions;
Upstream and/or downstream volumes, discharges and velocities;
Backwater impacts, effects on existing upstream/downstream drainage conveyance
facilities;
A general overview of the project, followed by a discussion of each of these seven items, is
presented below.
7. Delineation of the Resource Conservation District (RCD) for perennial and intermittent
streams as determined by the Town, jurisdictional wetlands, soil series, and regulatory
FEMA Special Flood Hazard Areas.
COM
SWIS Exemption Request
March 6, 2007
Page 3
if Erosion control measures will be enacted to minimize the amount of sediment from the
construction site that enters the drainage system and streams. Stockpiles of soil will be
covered with tarps or surrounded by silt fences to prevent erosion and sediment laden
discharge. Inlets will be fitted with filters or other BMPs to impede sediment transport into
the drainage system. Since the area of disturbance will be greater than one acre, the state
requires that an erosion control permit (ECP) be obtained prior to construction, which will
conform to all State and Local requirements for erosion control and the Town and County will
be provided a copy of the ECP application when it is submitted to the State.
During the replacement of the tunnel system, care will be taken to restore disturbed areas to
their present condition (i.e„ replace "like with like") such that there will not be an increase in
impervious cover. In fact, a decrease in impervious area is anticipated once the project is
complete. Furthermore, the existing hydrology is not expected to change significantly since
the direction of discharge of each basin draining to the construction corridor will be
preserved. Stormwater that accumulates in trenches during construction will be pumped out
of the corridor through a silt bag. The direction of discharge will be preserved and
conveyance channels will be reinforced to prevent erosion.
with a new one. Tunnel 39 will remain operational during construction to allow the COGEN
facility to operate and will be abandoned in place (filled with concrete) once the new tunnel is
operational. Figure 1 shows a general layout of the new tunnel.
The construction of the tunnel will impact the East Stormwater Pond (Pond 2) at the COGEN
facility and, consequently, the pond will be modified to accommodate the encroachment. The
proposed tunnel will limit the footprint available for the modified Pond 2 such that COGEN
would like to construct the modified pond with concrete sidewalls. As detailed in the
enclosed Pond 2 Analysis (see Appendix A), CDM is planning to replace the existing Pond 2
with a 75-foot long, 30-foot wide and 10-foot deep "pond" with improved hydraulic
performance over the existing pond. The New Pond 2 design reduces the existing peak flows
resulting from the 1-, 2-, 25- and 100-year design storms as documented in the Pond 2
Analysis. Since New Pond 2 (including the floor) will be made of concrete, it is considered
2,250 square feet of new impervious area. However, 400 feet of the existing 6-foot-wide steam
tunnel that is currently above ground will be buried with the new tunnel design. Therefore,
the 2,250 square feet of impervious area resulting from New Pond 2 will be offset by 2,400
square feet of pervious area caused by steam tunnel modifications. A Downstream Defender
pretreatment device is being installed upstream of New Pond 2 to provide enhanced TSS
removal over the existing pond.
COM
Information submittal for Items 1 through 7 listed above follows:
SWIS Exemption Request
March 6,2007
Page 4
The on-site and off-site drainage conditions are not expected to change with the project since
there will be no net increase in impervious cover, no significant alteration of the hydrology in
the contributing basins, and stormwater and erosion control measures will be in place during
construction.
Item 3: Upstream and/or Downstream Volumes, Discharges and Velocities
As mentioned in Item 2, upstream and downstream discharges were estimated as
documented in the attached Hydrologic Analysis. These estimated peak flows as well as
volumes and velocities are not expected to be affected by construction since there will be no
net increase in impervious cover, no significant alteration of the hydrology in the contributing
basins, and stormwater and erosion control measures will be in place during construction.
Item 1: Land Use Density, Impervious Surface Area, and Phasing
COM delineated the basins draining to the steam tunnel construction corridor using
topography along with road, building, and drainage system shapefiles provided by the town.
Aerial photos were examined and engineering judgment applied to assign land use
coefficients to each drainage basin for use of the rational method to calculate peak runoff
flows. These aerial photos were received from the town and are presented in Figure 1. The
process of assigning land use coefficients considers land use density and impervious surface
area as documented in the enclosed Hydrologic Analysis (see Appendix B). Stormwater and
sediment will be managed properly and consistently through all phases of the project.
Item 2: Location, Topography, On-Site and Off-Site Drainage Conditions
The location of this project is on the University of North Carolina's Chapel Hill campus. The
construction corridor is approximately 2,800 feet long and lies primarily between NC
Highway 86 and Roberson Street. The corridor is approximately 40 feet wide, which
corresponds to an area of disturbance of approximately 2.6 acres.
The town of Chapel Hill provided 2-foot contour topography data for CDM's use. These
contours were used to delineate the basins presented in Figure 1. Figure 2 shows the contours
of the site along with the deUneated basins. Peak flows were estimated for these basins using
the rational method as summarized in the attached Hydrologic Analysis.
CDM
SWIS Exemption Request
March 6,2007
Page 5
I r-
Item 4: Backwater Impacts, Effects on Existing Upstream and/or Downstream Drainage
Conveyance Facilities
As mentioned in the general overview, the tunnel construction will affect the existing Pond 2
at the COGEN facility. However, the replacement pond exceeds the performance of the
existing pond. Even with the pond modifications, there will be no net increase in impervious
cover, no significant alteration of the hydrology in the contributing basins, and stormwater
and erosion control measures will be in place during construction.
Item 5: Ability of Natural Drainage Channel to Convey Additional Volume, Discharges, and
Velocities
Any natural channels passing through the corridor will not need to convey additional
volume, discharge, or velocities since there will be no net increase in impervious cover, no
significant alteration of the hydrology in the contributing basins, and stormwater and erosion
control measures will be in place during construction.
Item 6: Potential Mitigation Measures
It is anticipated that no mitigation measures will be necessary for this project since there will
be no net increase in impervious cover, no significant alteration of the hydrology in the
contributing basins, and stormwater and erosion control measures will be in place during
construction.
Item 7: Delineation of the Resource Conservation District (RCD)for Perennial and
Intermittent Streams as Determined by the Town, Jurisdictional Wetlands, Soil Series, and
Regulatory FEMA Special Flood Hazard Areas
During the pre-application discussion, the Town Stormwater Engineer indicated that this
would not be necessary for this particular project due to its location on the UNG campus.
COM
Very truly yours.
cc:J. Masson, UNC
N. Cesarz, AEI
B. Petterson, AEI
D. Neamtu, COM
W. Michael Brinchek, P.E.
Project Engineer
COM
SWIS Exemption Request
March 6, 2007
Page 6
• ■')
Closure
The above information along with the enclosed drawings, maps, Hydrologic Analysis, and
Pond 2 Analysis completes our "mini SWIS" application. We appreciate the town's
consideration of our request for exemption. Please contact myself or Lee Sherman if you have
further questions or information requests. CDM looks forward to working with the town
towards the successful completion of the UNC Steam Tunnel Replacement project and
ensuring that sediment and stormwater are managed properly.
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Figure 2 - Contours and Drainage Basins for the UNC Steam Tunnel
Legend Elevation Contours L
<318Steam Tunnel
318-478Basins
480 - 488
490 - 498
■E
500 - 508
S
510 - 550
0 500
■ Feet
125 250
5®
Job No: 26933-42051
Pond 2 Modification Analysis
Objective:
Approach:
Development:
1) Develop Composite Curve Number(
A composite curve number was calculated as follows.
1
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
3)
4)
5)
1)
2)
L. Sherman
3/6/2007
Determine curve number of contributing drainage area.
Estimate peak flows for drainage area using the SCS curve number method in
HEC-HMS.
Model the existing pond in HEC-HMS
Design new pond to exceed performance of existing pond.
Comply with current detention pond guidelines as possible given restricted
footprint.
CNco>np
Basin N4, which drains to the detention pond, was delineated as detailed in the
Hydrologic Analysis (enclosed). Curve number values taken from Table 2.2 of the Town
of Chapel Hill Design Manual (Design Manual) were applied to each sub-area based
upon ground cover identified in GIS, To be conservative, it was assumed that the soils in
question are in Hydrologic Soil Group D. Figure 1 shows the subareas used to compute
the composite curve number while Table 1 summarizes the calculation.
Design a modified detention pond to equal or better the performance of existing detention
pond (Pond 2).
where CNCOmP is the composite curve number, Aj is a sub-area of die basin, and CN, is the
curve number assigned to the sub-area.
Job No: 26933-42051
'jji,
Table 1
Cover Type CN CN*Area
2) Estimate Peak Flows
2
Table 2.1 of the Design Manual, specifies that detention facilities must convey 24-hour
design storms as computed by the SCS method for recurrence intervals of 1-, 2-, and 25-
years. In addition, a check storm analysis must be performed for the 100-yr storm to
ensure that surcharge or overflow discharges will be conveyed in a controlled and safe
manner.
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
Rainfall depths were selected from Table 2-A-2 in the Design Manual as summarized in
Table 2.
L. Sherman
3/6/2007
5
Subarea
ID
1
2
3
4
5
grass__
__grass
grass
gravel
pavement
CN Composite
_2i6_
9.6
7.2
6.4
75.4
88.7
80
80
80
91
92
Area
(acres)
0.12
0.12
0.09
0.07
0.82
02 »»
/
Figure 1: Sub Areas
Job No: 26933-42051
Basin Model
Time of Concentration:
Basin Area:1.24 acres as computed in the Hydrologic Analysis.
Loss Method;SCS Curve Number as specified in the Design Manual.
Transform Method:SCS Unit Hydrograph as specified in the Design Manual.
Curve Number:89 (see above)
Initial Abstration:
% Impervious:
% Impervious =
Lag Time:Lt
3
-10 =0.25
7
1000
CN
I
I
Client: Town of Chapel Hill
Project: (JNC Steam Tunnel
Detail: Detention Pond Design
Computed to be 5 minutes via the Kirpich equation as
discussed in the Hydrologic Analysis.
L. Sherman
3/6/2007
= 0.6*tc
= 0.6*(5 mins)
= 3 mins
0.07+ 0.82
1.24
Precipitation
Depth
(inches)
1.71
3.6
6.4
8
_________Table 2
Recurrence
Interval
(years)
1
2
25
100
Precipitation depth calculated using
equation on Page 9 of the Design
Manual.
Peak flows and runoff hydrographs were computed with the Hydrologic Engineering
Center’s Hydrologic Modeling System (HEC-HMS) by the SCS Curve Number method.
Inputs for the HEC-HMS model were as follows:
Ia =0.2*
Considering gravel and pavement as impervious cover, the
numbers in Table 1 can be used to compute % Impervious
as follows:
*100% = 72%
Job No: 26933-42051
Meteorological Model:
Precipitation:SCS Storm as specified in the Design Manual.
Method:Type 2 as specified in the Design Manual.
Rainfall Depth:As summarized in Table 2.
Control Specifications:
Simulation Duration:96 hours
Time Interval:1 minute
Results:
N4
12
10-
8-
8-
4------
2-
Peak Flow
4
Client: Town of Chapel Hill
Project: (JNC Steam Tunnel
Detail: Detention Pond Design
Peak flows are summarized in Table 3 and Figure 2 shows an example of the outflow
hydrograph generated in HEC-HMS for the 25-yr storm.
L. Sherman
3/6/2007
y.
Ul.
(cfs)
2A
~5.6
10.3
13
_______Table 3
Recurrence
Interval
(years)
1
2
25
100
i - ------1——
i 12:00 00:00 12:00 00:0£
7 oajan20C8 | 10Jan2006 |
Figure 2: Hydrograph for 25-Yr Storm for Basin N4
Job No: 26933-42051
3) Model Existing Pond
Upstream Element:Basin N4
Downstream element:Sink-1
Method:Outflow Curve
Storage Method:Elevation-Area-Discharge
Elevation-Area Function:See Exhibit 2
Elevation - Discharge Function;
Initial Condition:Elevation = 472
5
The geometry of Pond 2, including the outlet structure were given in the UNC Boiler
Plant NPDES Permit supplied by COGEN staff and other documents produced by
AWARE and Carter Burgess. The original pond design and modeling was completed by
Greenhome and O’Mara. Exhibit 1 is a drawing of the outlet structure of the existing
Pond 2, while Exhibit 2 is the elevation and surface area relationship.
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
Developed a stage - discharge curve as discussed in
the subsequent section.
L. Sherman
3/6/2007
As can be seen in these documents, the existing outlet consists of stop logs stacked across
the face of a concrete riser structure. Flow through the structure is controlled through 2
orifices in the stop logs in as well as an overflow weir. Since Pond 2 is currently
operated with no spacers between the stop logs, it is assumed for this study that the
amount of flow passing between the logs is negligible. It is also assumed that the stop
logs are flush with the top of the concrete structure. The Greenhome and O’mara report
(October 1992) describes the 24-inch RCP pipe as operating under inlet control and it is
therefore assumed to be operating under inlet control for this study. The pipe accepts
flow passing through the three controls in the riser. Significant elevations of the existing
pond and outlet structure are summarized in Table 4.
The pond routing was performed in HEC-HMS. The pond is modeled as a reservoir that
has inflow, outflow and storage. Figure 3 shows the basin model for the existing pond.
The icon labeled “N4” is the upstream drainage area to Pond 2. The icon labeled “Sink”
represents the outlet of the basin mode and it has an inflow, but no outflow. The
following were inputs into the reservoir component of the HEC-HMS model:
Job No: 26933-42051
Table 4
Elevation
Note
Sink-1 =
Development of Stage - Discharge Curve for Existing Pond Outlet Structure
2 = 0.372*Cn/*«*(w)l
where
6
‘XSBasin Model [N4 Cogen]
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
Flow
Weir Coefficient (3 assumed for initial calculations)
Width of Weir Crest
L. Sherman
3/6/2007
(ft)
472
473
474.14
477.1
479.18
480
Pond Bottom
Invert of 24-inch RCP
Orifice 1 (2-inch square orifice)
Orifice 2 (7.3-ft x 3-inch rectangular orifice)
Top of stop logs forming 15-foot overflow weir1
Top of pond_________
'Fifteen feet excludes area covered by the wooden deck.
±______ 'in _| 2
Figure 3: HEC-HMS Basin Model for Existing Pond 2
Q cw
B
t^N4
|—-il Existing Pond 2
At water surface elevation increments of 0.5 inches (beginning with the pond bottom
elevation of 472 feet), flow through the outlet structure was computed using the equations
governing unsumberged and submerged culvert hydraulics under inlet control. If a
culvert is unsubmerged, it performs effectively as a weir and flow is estimated as follows
Job No: 26933-42051
HW Depth of Water Above Culvert Invert
W
Where
7
Client: Town of Chape! Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
Flow
Discharge Coefficient (0.6 assumed for initial calculations)
Depth of Water Above Culvert Center
Culvert Diameter
L. Sherman
3/6/2007
C.’
Q
Cd
HW
D
If the depth of water is greater than or equal to 1.3 times the culvert height, the culvert is
submerged and flow is estimated using the orifice equation as follows:
The original design calculations performed by Greenhorne and O’Mara confirmed that
the existing culvert operates under inlet control. The inlet control assumption is
appropriate given the size and slope of the pipe, which will be preserved for this project.
The stage discharge curve entered into HEC-HMS to model the outflow of the existing
pond for any given water surface elevation is shown in Figure 4.
Given the inputs described above, HEC-HMS is able to predict the outflow hydrograph of
the pond tor the design storms specified in Table 3. Figure 5 demonstrates the outflow
hydrograph of the 25-yr storm, while Table 5 summarizes the peak flows for each storm.
0 = 0.0437 *CJ*D2 *
Job No: 26933-42051
Table 5
Peak Outflow
T
Figure 4 - Stage - Discharge Relationship for the Existing Pond Outlet Structure
8
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
L. Sherman
3/6/2007
Recurrence
Interval
(years)
1
2
25
100
(cfs)
0.2
4.9
8.6
10.2
40 -
35 -
30
20 -
15 -
.10 •
5 ■
472 473 474 476475 477 478 479 480 481 482
Elevation
Job No: 26933-42051
Old Pond
9
9-
7-
6--
5- -
4-
3-
2-
1--
4) Design New Pond 2 to Equal or Exceed Existing Pond Performance
Pond Volume
9
00:00
I
00:00
I
-4
00:00
I
The existing NPDES Permit for the UNC Boiler Plant requires the New Pond 2 to be at
least 150,000 gallons. COGEN staff requested that the pond be as large as possible.
Therefore, the sizing of New Pond 2 maximizes volume while conforming to a footprint
restricted by proximity to the proposed steam tunnel path (to the north) and a steep slope
(to the south) and design guidelines summarized below.
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail. Detention Pond Design
12:00
11Jan2006
12:00
12Jan2OO6
12:00
10Jan2006
L. Sherman
3/6/2007
u.
y.
Iu
! 0i—“
i 12:00
H 09Jan2006
, Legend----------
I --------- RU1S4 YR ■ oa HR 5emem:0L0 POND Rfcs«*:OiMfk>a
Figure 5 - Existing Pond 2 Outflow Hydrograph from 25-Yr Design Storm
The dimensions of the proposed pond are 75 feet long by 30 feet wide by 10 feet deep.
These dimensions increase the storage volume of the pond to 22,500 ft3 (168,312 gal)
from the existing 14,000 ft3 (104,727 gal). The Elevation-Area relationship input to the
HEC-HMS model is shown as Table 6 below.
In order to design the pond outlet geometry, New Pond 2 was modeled in HEC-HMS as
was Existing Pond 2. Various combinations of Elevation-Area and Elevation-Outflow
curves were input and tested until design criteria were met. Except for the input of these
curves, the New Pond 2 model was identical to the Existing Pond 2 model described in
Section 3.
Job No: 26933-42051
2,250
Outlet Structure
Elevation-Outflow curves were developed for various outlet structure geometries
Table 7
Note
10
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
L. Sherman
3/6/2007
Pond Bottom
Invert of 24-inch RCP outlet pipe_______
Orifice 1 (2-inch circular orifice)________
Orifice 2 (4-inch circular orifice)________
Orifices 3 and 4 (2, 9-inch circular orifices)
Overflow weir (8 feet long)____________
Top of pond ___________
Table 6_______
Surface Area
(ft2)
(ft)
472
472
472
476
478
480
482
Elevation
(ft)
_472__
474
476
478
480
482
cuives were ueveiopea ror various outlet structure geometries as
described in Section 3. These curves were then input into the HEC-HMS model and
tested until design criteria were met. The proposed outlet structure is a 4-ft square by
8-ft tall riser. Similar to Existing Pond 2, a 24-inch RCP pipe accepts flow passing
through controls on the riser structure. The New Pond 2 riser structure is made
completely of reinforced concrete and contains five flow controls, which are
summarized in Table 7. Since New Pond 2 has a concrete floor, the invert of Orifice
1 was placed at the pond floor to ensure complete drainage. Orifices 2, 3, and 4
provide control of the 1-, 2-, 25-, and 100-yr (24 hr) design storms. Figure 6 is the
outflow curve resulting from this geometry.
Elevation
Job No: 26933-42051
Figure 6 - Elevation-Outflow Curve for New Pond 2
Design Guidelines
Design Guideline 1: Drain Within 72 Hours
Design Guideline 2: Capacity of Outlet Pipe Must Convey the 100-yr Design Flow
Design Guideline 3: Must Have an Operations and Maintenance Plan
The Operations and Maintenance Plan will be delivered upon construction.
IL
The remainder of this document demonstrates how the above geometry for New Pond 2
meets or exceeds design guidelines.
Exhibit 3 contains outflow hydrographs for all design storms modeled for New Pond 2.
In all cases, the time from which the peak flow occurs to when the flow is zero is 72
hours or less.
L. Sherman
3/6/2007
if
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
At the maximum allowable water surface elevation of 482, the head upon the 24-inch
RCP is 9 feet. For a 24-inch culvert with inlet control and 9 feet of head, the FHWA
Nomographs (1985) predict a flow of 43 cfs. This flow well exceeds the 100-year design
flow of 13 cfs.
50
45
40
35
10
5
474 480 482476 478
Elevation (ft)
0 -r-
472
i30
<x> £ 25
JZ o
.S2 20
Q
15
Job No: 26933-42051
Design Guideline 4: Must Have Access for Maintenance
Design Guideline 6: Maximum Depth of 10 Feet
The design depth of New Pond 2 is 10 feet.
Design Guideline 7: Minimum flow length to flow width ratio of 3:1
12
Design Guideline 9: Manage The Increase In Total Volume Of Runoff That Results
From Replacing The Pond
Design Guideline 8: Maintain existing 1-, 2- and 25-yr (24 hr) Peak Flows out of the
Existing Pond
Design Guideline 5: Must Provide for Sediment Storage Equal to 20% of Detention
Volume in Addition to Stormwater Runoff
Client: Town of Chapel Hill
Project: (JNC Steam Tunnel
Detail: Detention Pond Design
L. Sherman
3/6/2007
Since New Pond 2 will be made of concrete, it is considered 2,250 square feet of new
impervious area. However, 400 feet of the existing 6-foot-wide steam tunnel that is
currently above ground will be buried with the new tunnel design. Therefore, the 2,250
square feet of impervious area resulting from Pond 2 modifications will be offset by
2,400 square feet of pervious area caused by steam tunnel modifications.
As can be seen in the attached drawings, a baffle has been installed in New Pond 2 to
ensure there is no short circuiting. The resulting flow length to flow width ratio is
approximately 7.5: 1.
Design
Storm
(years)
1- yr
2- yr
25-yr
10O-yr
New
Pond
(cis)
0.1
0.2
2
5
Existing
Pond
(cfs)
0.2
5
9
10
___Table 8
Basin
N4
(cfs)
2.5
5.6
10.3
13
A downstream defender (3 meter diameter) will be placed upstream of the detention pond
to provide TSS removal. This pretreatment device meets the sediment storage
requirements.
Stairs arc being built to provide access for maintenance. In addition, a gate valve is being
placed on the outlet pipe so it can be closed for maintenance activities.
Table 8 compares the peak inflows and outflows of the new and existing ponds. The
comparison demonstrates that the peak flows are reduced for each design storm.
Job No: 26933-4205!
Design Guideline 10: Provide Treatment to Achieve TSS Removal
13
A downstream defender (3 meter diameter) will be placed upstream of the detention pond
to provide TSS removal. This pretreatment device is rated to achieve greater than 80%
TSS removal for flows up to 5.6 cfs, or up to the 2-year design storm. The capacity of
the downstream defender is 14.5 cfs, which will convey the 100-year design flow of 13
cfs, though the removal efficiency will be lower.
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Detention Pond Design
L. Sherman
3/6/2007
■■■■■
APPENDIX A
POND 2 ANALYSIS
EXHIBIT 1: EXISTING OUTLET STRUCTURE
"'ZSTXiSZZV ss
POND 1 - 20 STOP LOGS - TOP OF TIMBER WALL AT EL 462.46■i
POND 2 - 13 STOP LOGS - TOP OF TIMBER WALL AT EL 479.181
POND 1 -.USE 2 AT. 4“x3" SPACERS TO CREATE 7.3-x3.0‘ ORIFICE
ABOVE STOP LOG #14 AT EL 459.46
POND 1 - USE 2 AT S'-IVxS" STOP LOGS TO CREATE 2"x3“ ORIFICE ’
ABOVE STOR LOG #3 AT EL. 454.17“■I RIPRAP
POND 2 - USE SPACERS TO CREATE 2“x2- ORIFICEi
ABOVE STOP LOG #3 AT EL. 474.17 24- R.C.P.
s
r/zxw///
S^-O11
WALL TO PROTECT ORIFICE
DETAIL TO SHOW RECOMMENDED MODIFICATIONS TO POND 1 & 2 OUTLET STRUCTURES
NO SCALE riGunc i
WALKWAY
2. ASSUME STOP LOG #1 BURIED
APPROXIMATELY 2 3/4" INTO OUTLET
STRUCTURE - BOTH PONDS.
e i2"
E.W.-E.F.
■
cx>I
-4-
ft
v*>VJ
s§
ma u
ujo
LilO
lA—1
'J
tf 13"
W.-E.F
-ANCHOR MSxiO.D ro WOOD
STRUCTURE
AT TOP/CLIP ANGLE
81' I
£
%
%
% u
I la I
■J 'L—PLACE RIPRAP IN FRONT OF STOP LOG
POND 2 - USE 2 AT 4"X3- SPACERS TO CREATE 7.3’x3.0- ORIFICE
ABOVE STOP LOG #9 AT EL 477.10
ft
NOTES:
•1. 4-X6-X8' STOP LOGS SPECIFIED BY
ORIGINAL DESIGN (ASSUME NOMINAL
SIZE OF STOP LOGS 3 1/2‘xS 1/2x8 )
APPENDIX A
POND 2 ANALYSIS
EXHIBIT 2: ELEVATION AND SURFACE AREA RELATIONSHIP
POND DATA
Elevovation
<30-
472 74.6302
473 683.6136 124.5521
474 923.7606 143.8125
475 1199.9244 162.0260
476 1500.9041 179.8490
1820.6486 194.8490
478 2166.4816 209.71875
479 2536.7229 224.4792-25}
TORE
480 2931.8304 239.453125
1“ = 20’Af’F'ftOVED BY :
□ESJGNEO BY :
Peremeter
(ft)
December 06. 2005 10:28:26 o.m.
Drowing: DETENTION POND NO 2 AREA CALCUl_AHONS.DWG.OWC
3JO5-J MONROE RD. CHARLOTTE, NC 28270
POND No. 2
- -JUNO-COGEN SW STUDY)
CARTER—BURGESS, INC.
CHAPEL HILL, NORTH CAROLINA
J.K.S.
REVISED
DRAWING NOi
FIGURE 4
'j. ' ' '..
Contour
Area (sq.
ft-)
296.6838
DATt NOVEMBER 2005
Project number
N505-01
R'1 ( >
APPENDIX A
POND 2 ANALYSIS
EXHIBIT 3: NEW POND 2 OUTFLOW HYDROGRAPHS11 • : !
«
New Pond 2
0.12-
0.10-
0.08-
0.04-
0.02-
-------Run: 1 YR - 96 HR ElomentNEW POND 2 Rasull.Oulflow
I
00:00
I
00:00
I
I
00:00
I
0.00
12:00 .
09Jan2006
/
/
I
12:00
12Jan2006
12:00
13Jan2006
I
12:00
10Jan2006
r
12:00
11Jan2006.
i
00:00
i
1
I
/
!
I
I
/
A
I
\
\
\ ■
II \V\
wu.o
I 0.06-
LL
<
New Pond 2
0.20-
0.15-
0.10"
0.05-
•. <•'
------Run:2 YR • 96 HR ElementiNEW POND 2 ResultOutflow
o.oo-f—
12:00
09Jan2006
J
12:00
10Jan2006
12:00
13Jan2006
n
12:00
11Jan2006
I
12:00
12Jan2006
IL o
I
Ll
/
/
1
I
00:00 00:00
I
I
00:00
I
I
00.00
/
New Pond 2
1.6
1.4-
1.2-
1.0-
I0.8-
0.6-I
■ <
0.4"
0.2-
------Run:25 YR - 96 HR Elemenl’.NEW POND 2 ResultOutflow
I
00:00
i
00:00
I
/
o.or—
12:00
09Jan2006
I
12:00
10Jan2006
12:00
11Jan2006
------ -------
1200
12Jan2006
12:00
13Jan2006
5
“T-
00:00
I
I
00:00
(0
IL o
§
lL
New Pond 2
6
5-
4-
r
2'
1-
RuodOOYR - 93 HR ElemenliNEWPOND 2 ResultOutflow
I
00:00
o-r^
12:00
09Jan2006
I
12:00
10Jan2006
I
12:00
11Jan2006
i
12:00
12Jan2006
12:00
13Jan2006
r 1
I
w u.
a
5 o
tZ
I
00:00
I
00:00
I
I
00:00
I
Job No: 26933-42051
Hydrologic Analysis
Objective:
Background:
1) By the rational method, peak flow is computed as follows:
1) Delineate areas draining to construction corridor.
2) Estimate peak flows for each area using the rational method, as described in Town
of Chapel Hill Design Manual 2005 (Design Manual).
Development:
Estimate the peak flow rate of basins contributing to the steam tunnel construction
corridor.
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Peak Flow Calculations
2) Basins were delineated by analyzing elevation data and system characteristics.
Basin S3 is shown below.
Q = CiA
Where: C is the Runoff Coefficient, i is the Rainfall Intensity (in/hr), and A = Basin
Area (acres)
L. Sherman
12/21/06
Page 1
3) Composite runoff coefficients were assigned to all basins and are calculated as
follows:
\ Ba ’a
Job No: 26933-42051Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Peak Flow Calculations
The runoff coefficients used for this study are taken from Table 2-C-1 in the
Design Manual. For Basin S3 illustrated above, GIS technology was used to
measure sub-areas as detailed below:
Al = 0.90 acres
A2 = 0.71 acres
A3 = 0.39 acres
L. Sherman
12/21/06
Page 2
= Xa
This table specifies that C for paved areas should be 0.96, while C for residences
with 2 dwellings per acre should be 0.7 and C for Apartments, schools, and
churches should be 0.84. Therefore, the following coefficients were selected:
Area 1: C - 0.7
Area 2: C = 0.84
Area 3: C-0.96
amp
•aV
Where: Ccomp is the composite runoff coefficient. A, is a sub-area of the basin, and
Cj is the runoff coefficient assigned to the sub-area.
»
Job No: 26933-42051
is computed with the above equation as follows:
= 0.8
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Peak Flow Calculations
4) Time of concentration was computed using Kirpich’s equation, which is equation
9.4.2 in Dr. David Maidment’s Handbook of Hydrology and is detailed as follows
This tc was rounded to 5 minutes. All t^’s were less than or near 5 minutes and
were set equal to 5 minutes, which is the minimum value commonly accepted in
practice.
Where: is the time of concentration (minutes), L is the longest flow path (LFP)
(feet), and S is the average slope of the watershed (ft/ft). L was calculated in GIS
by drawing a longest flow path and computing the length for each basin (see
below). S was computed by taking the difference between the elevation contours
at the beginning and the end of the longest flow path and dividing by the longest
flow path. U was computed for Basin S3 as follows:
L. Sherman
12/21/06
Page 3
0.7 * 0.9 -4- 0.84 * 0.71 -F 0.96 * 0.39
0.9 + 0.71 + 0.39
and Ccomp
* £-0.385
tc = 0.0078 *5770-77
tc =5.2 minutes
r(.omp
c comp
tc = 0.0078 *LQT7
*0.016’°J85
Job No: 26933-42051
6) Peak flows were then computed with the rational method as follows:
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Peak Flow Calculations
i, 1 -yr = 4.52 in/hr
i, 2 -yr = 5.76 in/hr
i, 10-yr= 7.22 in/hr
i, 25-yr= 8.19 in/hr
i, 50-yr = 8.96 in/hr
i, 100-yr = 9.72 in/hr
C*i*A
0.8*2.01 acres*4.52 in/hr = 7.3 cfs
9.3 cfs
11.6 cfs
13.2 cfs
14.4 cfs
15.6 cfs
L. Sherman
12/21/06
Page 4
Qi-yr =
Ql-yr =
Ql-yr =
QlO-yr =
Q25-yr =
QjO-yr —
QlOOyr =
5) Rainfall intensities for a suite of design storms were selected for each basin using
Intensity-Duration-Frequency (IDF) Table in Appendix 2-A of the design manual.
According to the Handbook of Hydrology, the average rainfall intensity, i, has a
duration equal to the critical storm duration, which is normally taken as the time
of concentration. Therefore, the storm duration was set equal to the time of
concentration and rainfall intensities were selected for the 2, 10, 25, and 50-year
storm events from the IDF table. By this methodology, the following intensities
were selected for Basin S3:
Job No: 26933-42051
Table 1
C
■ o )
Table 2K
Basin
4.52 5.76 7.22 8.19 8.96 9.72
Client: Town of Chapel Hill
Project: UNC Steam Tunnel
Detail: Peak Flow Calculations
7) Table I shows the physical parameters for each subbasin and Table 2 shows the
calculation of peak flows.
L. Sherman
12/21/06
Page 5
_Jso
in/hr
125
in/hr
Ig
in/hr
ho
in/hr
boo
in/hr
SI
S2
S3
S4
S5
S6
N1
N2
N3
N4
N5
L
ft
196
193
577
279
527
292
72.3
218.8
323.9
570.1
807.8
H
12
5
9
10
24
10
14
6
18
U
38
Area
acres
0.51
0.53
2.01
2.24
0.67
0.09
0.45
0.81
0.28
1.24
8.60
0.84
0.84
0.8
0.7
0.7
0.9
0.9
0.6_
0.5
0.75
0.8
Tc
min
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
Qi
cfs
~L9
2.0
7.3
7.1
2.1
0.4
1.8
2.2
0.6
4.2
31.1
li
in/hr
Q2
cfs
2.5
2.6
9.3
9.0
2.7
0.5
2.3
2.8
0.8
5.4
39.6
Q25
cfs
3.5
3.6
13.2
12.8
3.8
0.7
3.3
4.0
1.1
7.6
56.3
Qso
cfs
3.8
4.0
14.4
14.0
4.2
0.7
3.6
4.4
1.3
8.3
61.6
S1
S2
S3
S4
S5
S6
N1
N2
N3
N4
N5
Q10
cfs
3.1
3.2
11.6
11.3
3.4
0.6
2.9
3.5
1.0
6.7
49.7
Q100
cfs
4.2
4.3
15.6
15.2
4.6
0^8
3.9
4.7
1.4
9.0
66.9
Basin
July 20, 2007
Raleigh, NC 27699-1617
Raleigh Regional Office - File
DWQ/Raleigh - Central Files
Certified Mail # 7006 0810 0002 6050 0199
Return Receipt Requested
Phone [phone]
Fax [phone]
Ms. Carolyn Efland
Assoc. Vice Chancellor-Facilities
300 South Building, CB#1000
Chapel Hill, NC 27599-1000
Mr. Timothy Aucoin
Operations Supt.
CB#1855, 501 Cameron
Chapel Hill, NC 27599
Mr. Allen Johnson
Plant Manager
CB#1855, 501 Cameron
Chapel Hill, NC 27599
NonhCarolina______Naturally
Customer Service
1-877-623-6748
/ha
O V._ -L. x-
Mr. Richard Mann
Vice Chancellor for Finance & Administration
University of North Carolina at Chapel Hill
300 South Building, CB# 1000
Chapel Hill, NC 27599-1000
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
Subject: NPDES Compliance Inspection Report
UNC Cogeneration Facility
NPDES Wastewater Permit No. NC0025305
Orange County
Sincerely,
Autumn Hoban
Environmental Specialist
Attachments
Cc:
Dear Mr. Mann:
The North Carolina Division of Water Quality conducted a recent inspection of the UNC At Chapel
• Hill Wastewater Treatment Facility on 6/13/2007. This inspection was conducted to verify that the
N* N€0025305ting COmpliance witl1 the conciitions and limitations specified in NPDES Permit
The purpose of this letter is to make a correction on comments noted on the inspection report dated
June 26, 2007 concerning the volume of make up cooling water reported to have spilled into Morgan
Creek on April 27, 2007. Please accept my apologies for any inconvenience this may have caused.
If you have any questions concerning this report, please contact me at 919-791-4317 in the Raleieh
Regional Office. 6
North Carolina Division of Water Quality 1617 Mail Service Center F_---------------------
ln,erne,: iiWw ncwaterqualitY.org Location: 512 N. Salisbury St. Raleigh.' NC ~27QM
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
1
ERA
NPDES
J17NC0025305
Remarks 66
211
Permit Effective DateEntry Time/Date
06/09/0107/06/1310:00 AM
Permit Expiration DateExit Time/Date
11/07/3107/06/1312:00 PM
Other Facility Data
Raymond E
Attach additional sheets of narrative and checklists as necessaiof Finding/Comments
(See attachment summary)
Agency/Office/Phone and Fax Numbers
" Point Source Compliance Unit///
HobanAutumn
lement Q A Rev)Signature of
'evious editions are obsolete.EPA Form 3560-3 (Rev 9-1
1Page #
3l
Section C: Areas Evaluated During Inspection
■ Flow Measurement
Facility Site Review
■ Storm WaterLaboratory
Section D: Summai
yr/mo/day
07/06/13
Contacted
No
QA
72Ld
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Inspection Work Days
67| I69
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Agency/Office/Phone and Fax Numbers
//
Name(s) and Signature(s) of Inspectof(s)
Facility Self-Monitoring Evaluation Rating
70LJ
Fac Type
2°LJ
Date
d//v7
Inspector
19EJ12l
Date
-p) /q 1~
73LU74
Name, Address of Responsible Official/Title/Phone and Fax Number
Dubose,Energy Services Chapel Hill NC 27599///
—Reserved-----
75l I I I I I I 180
Permit
■I Self-Monitoring Program
J11
UNC Cogeneration Facility
501 W Cameron Ave
Chapel Hill NC 27599
United States Environmental Protection Agency
Washington, D.C. 20460
Water Compliance Inspection Report--------
Section A: National Data System Coding (i.e., PCS)
Inspection Type
18[cJTransaction Code
1 u 2 LJ
B1
71 LI__
* — ~ Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW. also include
POTW name and NPDES permit Number)
- i (Check only those areas evaluated)
Operations & Maintenance | Records/Reports
Compliance Schedules | Effluent/Receiving Waters
f
J 5
J11 J17
as necessary)
NPDES
NC00253053l 12l
Stormwaler analytical sampling is required at the East and West detention pond outfalls at the beginning
Inrii 9nnRf 3 Permit.,erm’ unl.?ss there is no stormwater discharged at the facility. Sampling results from
April 2006 were reviewed and in compliance with the permit. A copy is attached to the inspection report.
A®fC?onAOAy1COn(tainment,is squired of section 313 of Title III Superfund Amendments and Reauthorization
Act (SARA) water priority chemicals or storage of hazardous materials to prevent leaks and spills from
contaminating stromwater runoff. Please review MSDS's. The Towerbrom 991 Microbiocide may fall under
the secondary containment requirement A.(5) Stormwater Pollution Prevention Plan b.2. PLEASE REVIEW
carefully and provide secondary containment as required.
(cont.) 1
Page # 2
yr/mo/day Inspection Type
07/06/13 |17 18[cJ
Summary of Finding/Comments (Attach additional sheets of narrative and checklists________Section D:
WASTEWATER INSPECTION COMMENTS:
h?hf artnierelWitMt2^o^ el'minate/reduce wastewater discharge from the CoGen Plant to
OWAS^hk N?DES D|Soharge permit with an option for emergency discharge should
OWASA be unable to handle the waste flow from the facility.
r“eS^Onpn2n006HTter ^0W dia9ran? are; The treated wastewater (approx. 55,600 gpd), cooling water
?47nn n5ndf0a0ndPd^ semtaly sewer (approx. 1,500 gpd), misc. process water (17,400 gpd), air wash water
to OWASAd Mason F^rmW^ W3ter (10,00° 9Pd)' Th'S 'S 3 tOtal maX V0,Ume of 175'000 9Pd
Kparn aPPr°x- 2201000 9al,ons of cooling water makeup was discharged to
i hlTh d reported t° DyyQ: Lhe fac?ty has reP°rted that the installation of a gate valve at the stream
e" approved 'n the budget. This would allow the plant to retain spills, emergency waste flow
on-site, and further prevent the possibhty of discharges to the stream.
Ind nnfenn^?Larid^ai-ntenar?Ce of the w.?ste treatment process is well documented in past inspections,
ano not covered in this inspection, since the plant is not currently discharging waste flow to the stream.
STORMWATER INSPECTION COMMENTS:
PERMIT:
!
)
1.
Page 2-1
2. Compliance Schedules:
The permit does not have any outstanding compliance schedules for this facility.
Section D: Summary of Findings/Comments
(Attach additional sheets of narrative and checklists as necessary)
5. Records/Reports:
a) A review of the daily monitoring data submitted during the previous 12-month period
indicates the facility was in compliance with the permit requirements and/or limitations.
The facility was issued no Penalty Assessments and no Notice(s) of Violation for the 12-
month period.
The permittee currently does not have any unpaid penalties. The permittee is remitided_of
his obligation to pay any penalties levied by the State of North Carolina for non-compliance
with your NPDES permit.
3. Facility Site Review:
The overall condition of the plant site was satisfactory. The appearance of the facility was in
acceptable condition indicating that the current housekeeping practices are very good.
4. Self-Monitoring Program:
You are reminded that your monitoring samples must be collected, preserved, and analyzed by
appropriate procedures and methods. You should maintain records of the sampler temperature,
and a certified laboratory must calibrate the sample thermometers annually.
Your operator is reminded that he/she must keep a logbook of all operation/maintenance
activities undertaken at the facility. The logbook should include all daily process control
activities including any field measurements conducted for process control. A visitation log for
the facility must also be maintained.
The facility is currently in compliance with these requirements.
Permit:
Your permit became effective September 1, 2006 and will not expire until July 31, 2011. The
facility is not currently under a Special Order by Consent.
The permit does not contain a limit for Total Residual Chlorine (TRC). The facility application
for the permit renewal did not specify that a source of chlorine existed. Please review MSDS's
for treatment products that contain available chlorine that are part of the waste stream.
Towerbrom 991 Cooling Water Treatment does contain chlorine, as well as, any potable water
that may be used in make-up, could contain chlorine. The DWQ policy requires facilities that
use chlorine to have a TRC limit of 17 ug/L for (WSIV - Class C Waters). Due to a recent
construction incident, approx. 120,000 gallons of cooling water makeup was discharged to the
stream and reported to DWQ. Sampling during the incident was also reported to DWQ and
showed a TRC of 0.15 mg/L. The facility reported no fish fatalies with this particular incident.
The facility or DWQ may re-open the permit to add a TRC limit, or may review information
upon permit renewal.
The permittee is reminded to read, understand and comply with all of the terms and conditions
contained in the permit. If you have questions concerning your responsibilities, call the Raleigh
Regional Office to speak to a Division of Water Quality Surface Water staff member.
I
)
http://h2o.enr.state.nc.us/tacu/WPCSDForm.doc
and operators o f this facility’ do an excellent job.
6.
7.
9.
Page 2-2
The facility is currently in compliance with these requirements. This facility is classified as
qfihysical Chemical Grade 2 (PC-2), the Operator in Responsible ChargefORC) is Timothy
Aucoin. He holds a PC-2 (Cert, No.985610), and the back up ORC holds a PC-1, The ORC
Flow Measurement:
If the permit requires a flow measurement device for determining the effluent flow, the flow
measurement device must be calibrated annually.
Not applicable unless an emergency wastewater discharge at the outfall is required. Flow to
OWASA is monitored in the operator control room.
8. Effluent/Receiving Waters:
The effluent discharge should be clear with a continuous flow with no visible changes to the
receiving waters.
The_ effluent discharge was clear and flow was continuous. The receiying waters looked clear
with no yisible changes from the effluent discharge.
Laboratory:
For all analytical data submitted for compliance monitoring purposes, a certified laboratory
must be utilized for all laboratory analysis. Additionally, if field parameter testing is conducted,
an operator certified to perform the specified field parameter analysis is also required. The
operator needs to be sure to calibrate all meters/instrumentation before each use and retain all
calibration records.
The facility is currently in compliance with these requirements and utilizes Tritest, Inc., certified
laboratory, Cert. No. 67.
Pretreatment:
This facility effluent stream consists ot domestic and industrial wastewater that is discharged to
OWASA-Mason Farm WWTP.
b) The facility must designate a certified Operator-in-Responsible-Charge (ORC) having a
certification level equal to or greater than the facility classification. A Back-up ORC must
also be designated with a minimum certification level at least one level less than the facility
classification.
The Division of Water Quality records do not indicate the current ORC, Contact, and
Owner information for UNC CoGen, Energy Services Department. Please submit updated
designation information for the Primary ORC, Backup ORC, Vice Chancellor for Finance
and Administration, and Plant Operations Manager to the attention of Steve Reid with the
Division’s Technical Assistance and Certification Unit using the form located here:
This inspection did not include an evaluation of requirements for pre-treatment. The facility’
should review when pre-treatment is required. The facility is obligated to meet any
requirements that may be set forth by any agreement governing the discharge to the OWASA-
Mason Farms WWTP.
J
)
b) This facility is conscientious and has taken proactive measures in water pollution prevention^
13. Compliance Status:
~] Neither3 Non-compliant1X1 Compliant
Page 2-3
7'^0f
Date
12. Operations & Maintenance:
The following items were noted during the inspection:
11. Compliance Sampling:
Compliance sampling was not conducted during the inspection.
Name and Signature of Inspector:
/ / /
Aii tunjh Hoban (
Surface Water Protection Section
Raleigh Regional Office
a) The facility has reported that the installation o f a gate valve at the stream outfall has been
approved in the budget. The installation of this valve would allow the plant to retain spills
or emergency waste flow onsite, and further prevent the possibdity of dischatges_lo the
stream. The prompt installation of this valve is strongly recommended.
10. Solids Handling/Disposal:
The facility must dispose of solids by an acceptable method such as a landfill or utilize the
services of an approved solids hauling and disposal contractor, which requires the facility to be
included under the contractor’s non-discharge permit (i.e. land application). The facility is
reminded to maintain adequate records (i.e. shipment dates, quantities, etc.) of any solids
hauling and/or disposal activities.
The facility should be prepared to comply with this requirement should disposal or _splids
handling be utilized in relation to this NPDES wastewater discharge permit.
)
Permit Yes No NA NE
0 ■
■
# Are there any special conditions for the permit?■ o o
Is access to the plant site restricted to the general public?■
■ ODO
Compliance Schedules Yes No NA NE
Is there a compliance schedule for this facility? o ■ o
■
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping?
The ORC does an excellent job. This facility is conscientious and proactive
(See Summary)
Effluent Sampling Yes No NA NE
Is composite sampling flow proportional? ■
Is sample collected below all treatment units? ■ O
Is proper volume collected? ■
Is the tubing clean? ■
o o ■ o
required by the permit (frequency, sampling type representative)?■ 000
Page #3
Permit: NC0025305
Inspection Date: 06/13/2007
Owner - Facility: UNC Cogeneration Facility
Inspection Type: Compliance Evaluation
Judge, and other that are applicable?
Comment: ” —“J
in water pollution prevention.
Is the facility compliant with the permit and conditions for the review period?
Comment:
■ ODO
Does the facility analyze process control parameters, for ex: MLSS, MORT, Settleable Solids, pH, DO, Sludqe ■ O
jLJdnA ann nthpr that ara onrvlif'ohloO 25
Is proper temperature set for sample storage (kept at 1.0 to 4.4 degrees Celsius)?
Is the facility sampling performed as
Is the inspector granted access to all areas for inspection?
Commont: The permit does not contain a limit for Total Residual Chlorine (TRC). The
facility application for the permit renewal did not specify that a source of chlorine
existed. Please review MSDS's for all treatment products that contain available chlorine
that are part of the waste stream. Towerbrom 991 Cooling Water Treatment does
contain ch onne, as well as, any potable water that may be used in make-up, could (
contain chlorine The DWQ policy requires facilities that use chlorine to have a TRC
limit of 17 ug/L for (WSIV - Class C Waters). Due to a recent construction incident,
approx 120 000 gallons of cooling water makeup was discharged to the stream and
reported to DWQ. Sampling during the incident was also reported to DWQ and showed
mJ The facillty rePorted no fish fatalities with this particular incident.
The facility or DWQ may re-open the permit to add a TRC limit, or may review
information upon permit renewal, (see comments section)
(If the present permit expires in 6 months or less). Has the permittee submitted a new application?
Is the facility as described in the permit?
)
Yes No NA NE
■
Comment:
Yes No NA NE
■
■ O
■ O
O ■
■
■Incubator (BOD) set to 20.0 degrees Celsius +/-1.0 degrees?
Comment:
Yes No NA NE
■ o
■ Is all required information readily available, complete and current?
■ o o Are all records maintained for 3 years (lab. reg. required 5 years)?
■ o o Are analytical results consistent with data reported on DMRs?
■ o Is the chain-of-custody complete?
Dates, times and location of sampling
Name of individual performing the sampling
Results of analysis and calibration
Dates of analysis
Name of person performing analyses
■
o ■
■
Page #4
Transported COCs
Are DMRs complete: do they include all permit parameters?
Owner - Facility: UNO Cogeneration Facility
Inspection Type: Compliance Evaluation
# Is the facility using a contract lab?
Is proper temperature set for sample storage (kept at 1.0 to 4.4 degrees Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius*/- 0.2 degrees?
Permit: NC0025305
Inspection Date: 06/13/2007
Has the facility submitted its annual compliance report to users and DWQ?
(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator on each shift?
Upstream I Downstream Sampling
Is the facility sampling performed as required by the permit (frequency, sampling type, and sampling location)?
Record Keeping
Are records kept and maintained as required by the permit?
Effluent Sampling
Comment: The facility sampled as required during a recent cooling water make up line
discharge that occurred during a construction incident.
The facility normally has no discharge to the stream. The plants effluent is discharged
to the OWASA - Mason Farm WWTP.
Laboratory
Are field parameters performed by certified personnel or laboratory?
Are all other parameters(excluding field parameters) performed by a certified lab?
Yes No NA NE
L
)
Record Keeping Yes No NA NE
Is the ORC visitation log available and current?■ 0
■ o
■ o
■ o
■
Page #5
Permit: NC0025305
Inspection Date: 06/13/2007
Owner - Facility: UNO Cogeneration Facility
Inspection Type: Compliance Evaluation
Is the ORC certified at grade equal to or higher than the facility classification?
Is the backup operator certified at one grade less or greater than the facility classification?
Is a copy of the current NPDES permit available on site?
Facility has copy of previous year’s Annual Report on file for review?
Comment: DMR's are supplied monthly as required by the permit. The flow is
recorded as zero, unless there is a discharge.
June 26, 2007
Certified Mail #7006 0810 0002 6048 7667
SUBJECT:
Dear Mr. Aucoin:
Enclosures
Cc:
I
Raleigh Regional Office-Stormwater Files
Raleigh - Central files
Stormwater Permitting Unit
NPS and Compliance Oversight, Danny Smith
Mr. Timothy Aucoin
Operations Superintendent
UNC Cogeneration Services
CB #1855, 501 Cameron Avenue
Chapel Hill, NC 27599-1855
Mr. Allen Johnson
Plant Manager
UNC Cogeneration Services
CB#1855, 501 Cameron Avenue
Chapel Hill, NC 27599-1855
Sincerely,
Autumn
Environmental Specialist
Michael F. Easley, Governor
Mnr+h r-, r William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
On June 13, 2007, Autumn Hoban, of the Division of Water Quality, Raleigh Regional Office performed a stormwater
h!?!hn°?dOh he SUbJe? fcC"ltyf The fac'lity is in “MPLIANCE with minor deficiencies regarding seconda™ containment
( should be reviewed. Specifically, secondary containment at a temporary storage building that holds treatment
products in close proximity to a Morgan Creek Tributary Drain. uuuumg mar noias treatment
919a79ir^7.the altaChed rePOrt 'f y°U °r y0Ur S‘aff haV6 any questions’d0 not hesitate 10 contact Autumn Hoban at
127 Cardinal Drive Extension, Wilmington, North Carolina 28405-3845
Phone: [phone] / Fax: [phone] / Internet: h2o.enr.state.nc.us
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
Compliance Evaluation Inspection
Facility Name UNC Cogeneration Services
Permit Number NC0025305
County Orange
NorthCarolina
Jyaturally
IDUJGII
)
Facility:
Location Address:Permit#:NC0025305
Contact Name:Phone Number:[phone]
Contact Mailing Address:County:
Directions:
x Rescission Request
A.Yes No N/A Comments
1.x
2.x
3.x
4.x
B.Yes No N/A
1.x
2.x
3.x
4.x
5.
x
6.x
7.x
C.Yes No N/A
1.x
2.x
3.x
4.x
5.x
6.x
D.Yes No N/A
1.x
2.x
*This Checklist
comments on
Unloading of bulk oil
and chemicals.
NCDENR
—U
Date: 6/
Are containers for temporary storage of wastes labeled?
Are waste materials recycled?
Are hazardous wastes properly handled and disposed of?
Is processed debris removed regularly?
Is there secondary containment for liquid wastes?
Are current waste management BMPs adequate?
MATERIAL STORAGE
UNC Cogeneration Systems
(new) 575 Cameron Ave. Chapel Hill, NC
Allen Johnson, Timothy Aucoin
CB# 1855, 575 Cameron Ave. Chapel Hill, NC
1-40 to Hwy 54 West (2nd Hwy 54 exit past Durham) Right
Routine Compliance Inspection
Complaint Investigation
areas inspected? Loading and
Other - Explain
STORM WATER POLLUTION PREVENTION PLAN
Is a copy of the signed and certified SWPPP at the facility?
Does the facility’s SWPPP address the minimum BMP requirements?
Are amendments to the SWPPP clearly documented?
Is the current SWPPP complete?
VEHICLE EQUIPMENT
Were the vehicle/equipment maintenance
unloading was inspected.
Orange
on Country Club to Cameron Ave
Are there appropriate BMPs for outdoor storage of raw materials,
products, and byproducts?
Are containers for chemical substances labeled?
Is vehicle/equipment washing done in a designed area so that wash water
can be properly managed? BMP’s in place.
Was the vehicle fueling area inspected? BMP’s in place.
Are vehicle maintenance activities kept indoors?
Were the vehicle/equipment storage areas inspected?
Are current BMPs in vehicle/equipment/fueling areas adequate?
WASTE MANAGEMENT
Are vehicle/machinery leaks and drips properly managed? BMP’s in
2 DEPARTMENT OF ENVIRON’ ID NATURAL RESOURCES
f JSTRIAL STORM WATER IN FORM
RALEIGH REGIONAL OFFICE
3.Is there secondary contain.brl’storage?
4.x
E.SPILL CONTROL Yes No N/A Comments
1.x
2.x
3.x
4.x
F.Yes No N/A
1.Are unpaved outdoor areas protected from water/wind erosion?x
2.x
3.x
G.Yes No N/A
1.x
2.
3.
H.Yes No N/A
1.x
2.Has monitoring been done?x
I.STREAM OBSERVATION/IMPACTS Yes No N/A
1.Were there any stream impacts?x
Are drainage ditches or the areas around the outfalls free of erosion?
Do implemented BMPs appear effective in controlling erosion?
NON-STORM WATER MANAGEMENT
Are used absorbent materials disposed of in a timely manner?
Are current spill BMPs adequate?
EROSION
Yes, as required by the
wastewater permit
There are unpaved
outdoor areas
associated with on­
going construction on
the new cooling tower.
Contractors were
utilizing silt fences and
erosion control
practices.
PROCESS WASTEWATER CONTROLS AND MONITORING
Are wastewater treatment facilities properly maintained?This facility retains a
wastewater discharge
permit.
The “ temporary”
chemical storage
building by the cooling
tower does not have
secondary
containment.
Please review the
BMP’s regarding
secondary
containment and
provide for secondary
containment as
required. SEE
COMMENT O.
BELOW
J Are current BMPs in material storage areas adequate?
Have all illicit water discharges been eliminated or permitted?
Are BMPs tor authorized non-storm water discharges properly
implemented?
Are there procedures for spill response and cleanup?
Are appropriate spill containment and cleanup materials kept on-site and
in convenient locations?
Are current BMPs adequate for management of authorized non-storm
water discharges?
ken_21 “ pH or DO?2.
3.
4.
x
5.
x
6.
x
J.
K.
1.
2.
1,2
(6/21/2007)
3.
4.
5.
[6.
Inspected by: Autumn Hoban
map, draw one or request that the facility provide you
A map was provided and is attached.
M. The vicinity map is on file.
N. The following records that were reviewed.
Were there any stream standard violations/
Were there excessive solids in the stream?
Were pictures taken?
Were samples taken?
RATING LEVEL (CIRCLE ONE: 1-6)
Industry in substantial compliance
Industry in compliance with minor deficiencies noted.
x
x
SUMMARY / ADDITIONAL COMMENTS
See Comments Below
Major deficiencies or discharges noted and require prompt correction. Revisit scheduled for
Critical deficiencies or discharges noted and require immediate correction. Revisit scheduled for
Rescission is appropriate.
Rescission is not appropriate.
| Were field paramete-
The facility outfall is located at an unnamed tributary of Morean Creek that eventually flows
to Jordan Lake. ------
MSDS’s for treatment chemicals on-site were reviewed..
° ^-Ondlary CoMainmeM^ required of Section 313 of Title III of Superfund Amendments and
Reauthonzation Act (SARA) water priority chemicals or storage of hazardous materials to
prevent leaks and spills from contaminating stormwater runoff. Please review MSDS's The
T^werbrom 991 Microbiocide may fall under the secondary containment requirement A (5)
Stormwater Pollution Prevention Plan b.2. PLEASE REV lEW this carefully and provide
secondary containment as required.
The Core “One Plan ’’ contained the SWP3 Plan and the required BMP’s. The complete
document was reviewed. ' ----
p fac,llty. bas, secwdarv containment for two -500,000 gallons #2 Fuel Oil Tanks that have
release valves that were locked. No water, waste product, sheen, etc, was observed within the
s_econdary containment area the day of the inspection. The facility should review all SPCC.
guidelines concerning secondary containment requirements.
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10:58 UNC COGEN^RATI^''PAGE 02
Page 1 of 1
Laboratory Report
Work Order #;0604-00018
UN1167
Test Performed Method Results Qualifier
Reviewed by:
forTritest, Inc
Total Suspended Solids
Chemical Oxygen Demand
Oil & Grease
Telephone: [phone]
Fax: (919)83^0497
Project No.: CHECK PROJECTS
Project ID:
EPA 180.2
EPA 410.4
EPA 16S4A
Time Sampled
13:20
Cust. Code:
Oust. P.O.#:
Report Date:
Date Received:
Sample Type
Grab
4/5f06
4/8/06
4/7/06
NC/WW Cert #: 067
NC/DW Cert. #: 37731
4/13/2006
4/4/2006
-- Prepared for —
David Burton
UNC Power Plant
501 Cameron Ave.
CB# 1800
Chapel Hill, NC 27599
12.2 ma/l-
98.4 mg/L
<5.0mg/L
Matrix
SW
Analyzed
Date Time
■11:10
9:05
8:00
Condition
4 +A 2 deg G
Date Sampled
4/4/2006
0
o
raoTEST
6701 Conference Drive
Raleigh, NC 27607
O19962437606/25/2007
, I
No. Sample ID
^rr west pond
June 26, 2007
Certified Mail #7006 0810 0002 6048 7667
9
SUBJECT:
Dear Mr. Aucoin:
Sincerely,
Environmental Specialist
Enclosures
Cc:
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
ram
{
I
127 Cardinal Drive Extension, Wilmington, North Carolina 28405-3845
Phone: [phone] / Fax: [phone] / Internet: h2o.enr.state.nc.us
On June 13, 2007, Autumn Hoban, of the Division of Water Quality, Raleigh Regional Office, performed a stormwater
inspection of the subject facility. The facility is in COMPLIANCE with minor deficiencies regarding secondary containment
that should be reviewed. Specifically, secondary containment at a temporary storage building that holds treatment
products in close proximity to a Morgan Creek Tributary Drain.
Raleigh Regional Office-Stormwater Files
Raleigh - Central files
Stormwater Permitting Unit
NPS and Compliance Oversight, Danny Smith
Compliance Evaluation Inspection
Facility Name UNC Cogeneration Services
Permit Number NC0025305
County Orange
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
Mr. Timothy Aucoin
Operations Superintendent
UNC Cogeneration Services
CB #1855, 501 Cameron Avenue
Chapel Hill, NC 27599-1855
Mr. Allen Johnson
Plant Manager
UNC Cogeneration Services
CB#1855, 501 Cameron Avenue
Chapel Hill, NC 27599-1855
Please review the attached report. If you or your staff have any questions, do not hesitate to contact Autumn Hoban at
919-791-4317.
foua
OneNorthCarolinaNaturally
\
. Facility:LTNC Cogeneration Systems Date:6/l 3/2007
Location Address:(new) 575 Cameron Ave. Chapel Hill, NC Permit#:NC0025305
Contact Name:Allen Johnson, Timothy Aucoin Phone Number:[phone]
Contact Mailing Address:CB# 1855, 575 Cameron Ave. Chapel Hill, NC County:Orange
1-40 to Hwy 54 West (2nd Hwy 54 exit past Durham) Right on Country Club to Cameron AveDirections:
Routine Compliance Inspection Rescission Requestx
Complaint Investigation Other - Explain
STORM WATER POLLUTION PREVENTION PLANA.Yes No N/A Comments
Is a copy of the signed and certified SWPPP at the facility?1.x
2.Does the facility’s SWPPP address the minimum BMP requirements?x
3.Are amendments to the SWPPP clearly documented?x
Is the current SWPPP complete?4.x
B.VEHICLE EQUIPMENT Yes No N/A
1.x
2.x
3.x
Was the vehicle fueling area inspected? BMP’s in place.4.x
Are vehicle maintenance activities kept indoors?5.x
6.Were the vehicle/equipment storage areas inspected?x
7.Are current BMPs in vehicle/equipment/fueling areas adequate?x
WASTE MANAGEMENTC.Yes No N/A
1.Are containers for temporary storage of wastes labeled?x
2.Are waste materials recycled?x
3.Are hazardous wastes properly handled and disposed of?x
Is processed debris removed regularly?4.x
Is there secondary containment for liquid wastes?5.x
6.Are current waste management BMPs adequate?x
D.MATERIAL STORAGE Yes No N/A
1.x
2.Are containers for chemical substances labeled?x
Are there appropriate BMPs for outdoor storage of raw materials,
products, and byproducts?
Are vehicle/machinery leaks and drips properly managed? BMP’s in
place.
Is vehicle/equipment washing done in a designed area so that w'ash water
can be properly managed? BMP’s in place.
Were the vehicle/equipment maintenance areas inspected? Loading and
unloading was inspected.
*This Checklist
comments on
Unloading of bulk oil
and chemicals.
NCDENR
DEPARTMENT OF EN\TRO>Ja|NT^D NATURAL RESOURCES
STRIAE STORM WATER l.W.C" FORM
RALEIGH REGIONAL OFFICE
1
Is there secondary contain storage?3;
Are current BMPs in material storage areas adequate?4.x
SPILL CONTROLE.Yes N/A CommentsNo
Are there procedures for spill response and cleanup?1.x
2.x
Are used absorbent materials disposed of in a timely manner?3.x
Are current spill BMPs adequate?4.x
EROSIONF.Yes No N/A
Are unpaved outdoor areas protected from water/wind erosion?1.x
2.Are drainage ditches or the areas around the outfalls free of erosion?x
Do implemented BMPs appear effective in controlling erosion?3.x
G.NON-STORM WATER MANAGEMENT Yes N/ANo
Have all illicit water discharges been eliminated or permitted?1.x
2.
3.
H.PROCESS WASTEWATER CONTROLS AND MONITORING Yes No N/A
1.Are wastewater treatment facilities properly maintained?x
2.Has monitoring been done?x
STREAM OBSERVATION/IMPACTSI.Yes N/ANo
Were there any stream impacts?1.x
There are unpaved
outdoor areas
associated with on­
going construction on
the new cooling tower.
Contractors were
utilizing silt fences and
erosion control
practices.
Are current BMPs adequate for management of authorized non-storm
water discharges?
Are BMPs for authorized non-storm water discharges properly
implemented?
Are appropriate spill containment and cleanup materials kept on-site and
in convenient locations?
This facility retains a
wastewater discharge
permit.
Yes, as required by the
wastewater permit
The “ temporary”
chemical storage
building by the cooling
tower does not have
secondary
containment.
Please review the
BMP’s regarding
secondary
containment and
provide for secondary
containment as
required. SEE
COMMENT O.
BELOW
Were field paramett H or DO?:en2:
3.Were there any stream standard violations/
Were there excessive solids in the stream?4.x
5.Were pictures taken?x
6.Were samples taken?x
SUMMARY / ADDITIONAL COMMENTSJ.
See Comments Below
K.RATING LEVEL (CIRCLE ONE: 1-6)
Industry in substantial compliance1.
Industry in compliance with minor deficiencies noted.2.1,2
(6/21/2007)
Major deficiencies or discharges noted and require prompt correction. Revisit scheduled for3.
4.Critical deficiencies or discharges noted and require immediate correction. Revisit scheduled for
5.Rescission is appropriate.
6.Rescission is not appropriate.
Inspected by: Autumn Hoban
A map was provided and is attached.
M. The vicinity map is on file.
N.The following records that were reviewed.
MSDS's for treatment chemicals on-site were reviewed..
O.
P.
x
X
The Core “One Plan ” contained the SWP3 Plan and the required BMP’s. The complete
document was reviewed.
Secondary Containment is required of Section 313 of Title III of Superfund Amendments and
Reauthorization Act (SARA) water priority chemicals or storage of hazardous materials to
prevent leaks and spills from contaminating stormwater runoff. Please review MSDS 's. The
Towerbrom 991 Microbiocide may fall under the secondary containment requirement A.(5)
Stormwater Pollution Prevention Plan b.2. PLEASE REVIEW this carefully and provide
secondary containment as required.
The facility' has secondary containment for two -500,000 gallons #2 Fuel Oil Tanks that have
release valves that were locked. No water, waste product, sheen, etc, was observed within the
secondary containment area the day of the inspection. The facility should review all SPCC
guidelines concerning secondary containment requirements.
The facility outfall is located at an unnamed tributary' of Morgan Creek that eventually flows
to Jordan Lake.
L. Include a Map of the facility. This drawing should depict the building, parking, process, and
storage areas. If you do not have a map, draw one or request that the facility provide you one in
your written correspondence.
Q. House keeping fance o f BMPs) were good. .'ai*
R. Identify outfalls and receiving waters. List any observation or concerns.
was^^ell^^ind best management practice\
The current floyv in the unnamed tributary' by the plant appears to be from a spring. The facility
reported testing and confirming that the flow is not a discharge at the plant. The flow is located
in the unnamed tributary. The closest stormwater pond was dry. Observations during the
inspection were consistent with the plant’s findings. The "spring flow” does not appear to be in
the stormmwater conveyance system and would be allowed, if it were so, by the permit.
Outfalls were observed and the unnamed tributary’ to Morgan Creek was observed at several
locations. No significant concerns were observed the day of the inspection.
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UNC-CH Cogeneration Facility
Manhole Color code
To Morgan Creek Tributary
To Oil Water Separator
To East Detention Pond
To West Detention Pond
Sanitary Sewer are not painted
06/25/2007 10: 58 UNC COGE]!ATL PAGE 02
Page 1 of 1
Laboratory Report
Work Order #:0604-00018
UN1167
Test Performed Method Results Qualifier
Reviewed by:
for Tritest. Inc
Total Suspended Solids
Chemical Oxygen Demand
Oil & Grease
Telephone: [phone]
Fax: (919) 83^5497
Project No.: CHECK PROJECTS
Project ID:
ERA 180.2
EPA 410.4
EPA 1664A
Time Sampied
13:20
12.2 mg/L
98.4 mg/L
<5.0 mg/L
Report Date:
Date Received:
Sample Type
Grab
NC/WWC#rt #: 067
NC/DWCert. #: 37731
4/5/06
4/B/06
4/7/06
Analyzed
Date Time
4/13/2006
4/4/2006
Condition
4 +A 2 deg c
6701 Conference Drive
Raleigh, NC 27607
Date Sampled
4/4/2005
0o
moTEST
Cust. Cede:
Oust. P.O.#:
Matrix
SW
11:10
9:05
8:00
— Prepared for —
David Burton
UNC Power Plant
501 Cameron Ave.
CB#1800
Chapel Hill, NC 27599
^^96^^76
No. Sample ID
-WT WEST POND
July 20, 2007
Cc:
Raleigh Regional Office - File
DWQ/Raleigh - Central Files
The purpose of this letter is to make a correction on comments noted on the inspection report dated
June 26, 2007 concerning the volume of make up cooling water reported to have spilled into Morgan
Creek on April 27, 2007. Please accept my apologies for any inconvenience this may have caused.
If you have any questions concerning this report, please contact me at 919-791-4317 in the Raleigh
Regional Office.
Subject: NPDES Compliance Inspection Report
UNC Cogeneration Facility
NPDES Wastewater Permit No. NC0025305
Orange County
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
Phone [phone]
Fax [phone]
Ms. Carolyn Efland
Assoc. Vice Chancellor-Facilities
300 South Building, CB#1000
Chapel Hill, NC 27599-1000
Mr. Allen Johnson
Plant Manager
CB#1855, 501 Cameron
Chapel Hill, NC 27599
Mr. Timothy Aucoin
Operations Supt.
CB#1855, 501 Cameron
Chapel Hill, NC 27599
Dear Mr. Mann:
The North Carolina Division of Water Quality conducted a recent inspection of the UNC At Chapel
Hill Wastewater Treatment Facility on 6/13/2007. This inspection was conducted to verify that the
facility is operating in compliance with the conditions and limitations specified in NPDES Permit
No. NC0025305.
Certified Mail # 7006 0810 0002 6050 0199
Return Receipt Requested
NorthCurolina______Naturally
Customer Service
1-877-623-6748
Mr. Richard Mann
Vice Chancellor for Finance & Administration
University of North Carolina at Chapel Hill
300 South Building, CB# 1000
Chapel Hill, NC 27599-1000
Sincerely, .
Autumn Hoban
Environmental Specialist
Attachments
fbuiqt
o V_
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617
Internet: www.ncwaterqualitv.org Location: 512 N. Salisbury St. Raleigh, NC 27604
An Equal Opportunity/Affirmative Action Employer-50% Recycled/10% Post Consumer Paper
EPA
NPDES
’213lNC0025305
6(3
Permit Effective DateEntry Time/Date
06/09/0107/06/1310:00 AM
UNC Cogeneration Facility
Permit Expiration DateExit Time/Date501 W Cameron Ave
11/07/3107/06/1312:00 PMChapel Hill NC 27599
Other Facility Data
Name, Address of Responsible Official/Title/Phone and Fax Number
Raymond E Dubose,Energy Services Chapel Hill NC 27599///
Records/Reports
Effluent/Receiving Waters
(See attachment summary)
Agency/Office/Phone and Fax Numbers
Point Source Compliance Unit///HobanAutumn
z 2
igement Q A ReviSignature of
4
‘evious editions are obsolete.EPA Form 3560-3 (Rev 9-S
Page #1
United States Environmental Protection Agency
Washington. D.C. 20460
yr/mo/day
07/06/13
Operations & Maintenance
Compliance Schedules
Contacted
No
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Facility Self-Monitoring Evaluation Rating
7°LJ
Agency/Office/Phone and Fax Numbers
//
Date
■7/2o/d 7
QA
72Ld
Inspection Work Days
671| 69
J17
Fac Type
20U
Inspection Type
18EJ
Date
7-//0 ?"
Inspector
19H
Name(s) and Signature(s) of Inspects)
/
J1’
Bl
71 u_
____________________________________________Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES permit Number)
73| I I74
Water Compliance Inspection Report
Section A: National Data System Coding (i.e., PCS)
________________Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
■ Permit | Flow Measurement
■ Self-Monitoring Program Facility Site Review
■ Laboratory | Storm Water
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Transaction Code
1 b 2 Lil
Remarks
21l I I I I I I I I I I I I I I I I I I I I I III I I I I I I I I I I I I I I I I I I I I I I
-—Reserved---------------------
75| | I | I I I I80
(cont.)1NPDES
NC0025305
STORMWATER INSPECTION COMMENTS:
PERMIT:
Page #2
yr/mo/day
07/06/13
Stormwater analytical sampling is required at the East and West detention pond outfalls at the beginning
and end of a permit term, unless there is no stormwater discharged at the facility. Sampling results from
April 2006 were reviewed and in compliance with the permit. A copy is attached to the inspection report.
Secondary containment is required of section 313 of Title III Superfund Amendments and Reauthorization
Act (SARA) water priority chemicals or storage of hazardous materials to prevent leaks and spills from
contaminating stromwater runoff. Please review MSDS's. The Towerbrom 991 Microbiocide may fall under
the secondary containment requirement A.(5) Stormwater Pollution Prevention Plan b.2. PLEASE REVIEW
carefully and provide secondary containment as required.
The operations and maintenance of the waste treatment process is well documented in past inspections,
and not covered in this inspection, since the plant is not currently discharging waste flow to the stream.
The facility has partnered with OWASA to eliminate/reduce wastewater discharge from the CoGen Plant to
the stream. They retain the NPDES Discharge permit with an option for emergency discharge should
OWASA be unable to handle the waste flow from the facility.
Estimates on 2006 water flow diagram are: The treated wastewater (approx. 55,600 gpd), cooling water
(approx. 55,800 gpd), sanitary sewer (approx. 1,500 gpd), misc. process water (17,400 gpd), air wash water
(34,700 gpd), and demineralizer backwash water (10,000 gpd). This is a total max volume of 175,000 gpd
to OWASA - Mason Farm WWTP.
Due to a recent construction incident, approx. 120,000 gallons of cooling water makeup was discharged to
the stream and reported to DWQ. The facility has reported that the installation of a gate valve at the stream
outfall has been approved in the budget. This would allow the plant to retain spills, emergency waste flow
on-site, and further prevent the possiblity of discharges to the stream.
,2l3l
Inspection Type
18i iLJi11 12i i 17J | 07/06/13 |
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
WASTEWATER INSPECTION COMMENTS:
1.
Page 2-1
Section D: Summary of Findings/Comments
(Attach additional sheets of narrative and checklists as necessary)
Permit:
Your permit became effective September 1, 2006 and will not expire until July 31, 2011. The
facility is not currently under a Special Order by Consent.
The permit does not contain a limit for Total Residual Chlorine (TRC). The facility application
for the permit renewal did not specify that a source of chlorine existed. Please review MSDS's
for treatment products that contain available chlorine that are part of the waste stream.
Towerbrom 991 Cooling Water Treatment does contain chlorine, as well as, any potable water
that may be used in make-up, could contain chlorine. The DWQ policy requires facilities that
use chlorine to have a TRC limit of 17 ug/L for (WSIV - Class C Waters). Due to a recent
construction incident, approx. 120,000 gallons of cooling water makeup was discharged to the
stream and reported to DWQ. Sampling during the incident was also reported to DWQ and
showed a TRC of 0.15 mg/L. The facility reported no fish fatalies with this particular incident.
The facility or DWQ may re-open the permit to add a TRC limit, or may review information
upon permit renewal.
The permittee is reminded to read, understand and comply with all of the terms and conditions
contained in the permit. If you have questions concerning your responsibilities, call the Raleigh
Regional Office to speak to a Division of Water Quality Surface Water staff member.
5. Records/Reports:
a) A review of the daily monitoring data submitted during the previous 12-month period
indicates the facility was in compliance with the permit requirements and/or limitations.
The facility was issued no Penalty Assessments and no Notice(s) of Violation for the 12-
month period.
The permittee currently does not have any unpaid penalties. The permittee is reminded of
his obligation to pay any penalties levied by the State of North Carolina for non-compliance
with your NPDES permit.
4. Self-Monitoring Program:
You are reminded that your monitoring samples must be collected, preserved, and analyzed by
appropriate procedures and methods. You should maintain records of the sampler temperature,
and a certified laboratory must calibrate the sample thermometers annually.
Your operator is reminded that he/she must keep a logbook of all operation/maintenance
activities undertaken at the facility. The logbook should include all daily process control
activities including any field measurements conducted for process control. A visitation log for
the facility must also be maintained.
The facility is currently in compliance with these requirements.
3. Facility Site Review:
The overall condition of the plant site was satisfactory. The appearance of the facility was in
acceptable condition indicating that the current housekeeping practices are very good.
2. Compliance Schedules:
The permit does not have any outstanding compliance schedules for this facility.
http://h2o.enr.state.nc.us/tacu/WPCSDForm.doc
6.Laboratory:
Flow Measurement:7.
8.
9.
Page 2-2
b) The facility must designate a certified Operator-in-Responsible-Charge (ORC) having a
certification level equal to or greater than the facility classification. A Back-up ORC must
also be designated with a minimum certification level at least one level less than the facility
classification.
Pretreatment:
This facility effluent stream consists of domestic and industrial wastewater that is discharged to
OWASA-Mason Farm WWTP.
The facility is currently in compliance with these requirements. This facility is classified as
a Physical Chemical Grade 2 (PC-2), the Operator in Responsible ChargejORC) is Timothy
Aucoin. He holds a PC-2 (Cert. No.985610), and the back up ORC holds a PC-1. The ORC
and operators of this facility do an excellent job.
Effluent/Receiving Waters:
The effluent discharge should be clear with a continuous flow with no visible changes to the
receiving waters.
The effluent discharge was clear and flow was continuous. The receiving waters looked clear
with no visible changes from the effluent discharge.
The Division of Water Quality records do not indicate the current ORC, Contact, and
Owner information for UNC CoGen, Energy Services Department. Please submit updated
designation information for the Primary ORC, Backup ORC, Vice Chancellor for Finance
and Administration, and Plant Operations Manager to the attention of Steve Reid with the
Division's Technical Assistance and Certification Unit using the form located here:
For all analytical data submitted for compliance monitoring purposes, a certified laboratory
must be utilized for all laboratory analysis. Additionally, if field parameter testing is conducted,
an operator certified to perform the specified field parameter analysis is also required. The
operator needs to be sure to calibrate all meters/instrumentation before each use and retain all
calibration records.
The facility is currently in compliance with these requirements and utilizes Tritest, Inc., certified
laboratory, Cert. No. 67.
This inspection did not include an evaluation of requirements for pre-treatment. The facilit},
should review when pre-treatment is required. The facility’ is obligated to meet any
requirements that may be set forth by any agreement governing the discharge to the OWASA-
Mason Farms WWTP.
If the permit requires a flow measurement device for determining the effluent flow, the flow
measurement device must be calibrated annually.
Not applicable unless an emergency wastewater discharge at the outfall is required. Flow to
OWASA is monitored in the operator control room.
b) This facility’ is conscientious and has taken proactive measures in water pollution prevention.
13. Compliance Status:
[3 Compliant O Non-compliant □ Neither
Page 2-3
12. Operations & Maintenance:
The following items were noted during the inspection:
Date
a) The facility’ has reported that the installation of a gate valve at the stream outfall has been
approved in the budget. The installation of this valve would allow the plant to retain spills
or emergency waste flow onsite, and further prevent the possibility of discharges to the
stream. The prompt installation of this valve is strongly recommended.
11. Compliance Sampling:
Compliance sampling was not conducted during the inspection.
10. Solids Handling/Disposal:
The facility must dispose of solids by an acceptable method such as a landfdl or utilize the
services of an approved solids hauling and disposal contractor, which requires the facility to be
included under the contractor’s non-discharge permit (i.e. land application). The facility is
reminded to maintain adequate records (i.e. shipment dates, quantities, etc.) of any solids
hauling and/or disposal activities.
The facility' should be prepared to comply with this requirement should disposal or solids
handling be utilized in relation to this NPDES wastewater discharge permit.
Name and Signature of Inspector:
Auturph Hoban (
Surface Water Protection Section
Raleigh Regional Office
Yes No NA NEPermit
■ (If the present permit expires in 6 months or less). Has the permittee submitted a new application?
■ Is the facility as described in the permit?
■ # Are there any special conditions for the permit?
■ Is access to the plant site restricted to the general public?
■
Yes No NA NECompliance Schedules
0 ■ oIs there a compliance schedule for this facility?
■ Is the facility compliant with the permit and conditions for the review period?
Comment:
Yes No NA NEOperations & Maintenance
■ Is the plant generally clean with acceptable housekeeping?
(See Summary)
Yes No NA NEEffluent Sampling
■ Is composite sampling flow proportional?
■ Is sample collected below all treatment units?
■ Is proper volume collected?
■ 0Is the tubing clean?
■ Is proper temperature set for sample storage (kept at 1.0 to 4.4 degrees Celsius)?
■ 0Is the facility sampling performed as required by the permit (frequency, sampling type representative)?
Page #3
Owner - Facility: UNO Cogeneration Facility
Inspection Type: Compliance Evaluation
Permit: NC0025305
Inspection Date: 06/13/2007
Is the inspector granted access to all areas for inspection?
Comment: The permit does not contain a limit for Total Residual Chlorine (TRC). The
facility application for the permit renewal did not specify that a source of chlorine
existed. Please review MSDS's for all treatment products that contain available chlorine
that are part of the waste stream. Towerbrom 991 Cooling Water Treatment does
contain chlorine, as well as, any potable water that may be used in make-up, could
contain chlorine. The DWQ policy requires facilities that use chlorine to have a TRC
limit of 17 ug/L for (WSIV - Class C Waters). Due to a recent construction incident,
approx. 120,000 gallons of cooling water makeup was discharged to the stream and
reported to DWQ. Sampling during the incident was also reported to DWQ and showed
a TRC of 0.15 mg/L. The facility reported no fish fatalities with this particular incident.
The facility or DWQ may re-open the permit to add a TRC limit, or may review
information upon permit renewal, (see comments section)
Comment: The ORC does an excellent job. This facility is conscientious and proactive
in water pollution prevention.
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable Solids, pH, DO, Sludge ■ODD
Judge, and other that are applicable?
Permit: NC0025305
Inspection Date: 06/13/2007
Yes No NA NEEffluent Sampling
Yes No NA NEUpstream I Downstream SampIjng
Comment:
Yes No NA NELaboratory
■ Are field parameters performed by certified personnel or laboratory?
■ Are all other parameters(excluding field parameters) performed by a certified lab?
■ 0# Is the facility using a contract lab?
■Is proper temperature set for sample storage (kept at 1.0 to 4.4 degrees Celsius)?
■Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
■Incubator (BOD) set to 20.0 degrees Celsius +/-1.0 degrees?
Comment:
Yes No NA NERecord Keeping
■ Are records kept and maintained as required by the permit?
■ Is all required information readily available, complete and current?
■ 0 Are all records maintained for 3 years (lab. reg. required 5 years)?
■ Are analytical results consistent with data reported on DMRs?
■ Is the chain-of-custody complete?
Dates, times and location of sampling
Name of individual performing the sampling
Results of analysis and calibration
Dates of analysis
Name of person performing analyses
Transported COCs
■ 0 Are DMRs complete: do they include all permit parameters?
■Has the facility submitted its annual compliance report to users and DWQ?
■ (If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator on each shift?
Page #4
Owner - Facility: UNC Cogeneration Facility
Inspection Type: Compliance Evaluation
The facility normally has no discharge to the stream. The plants effluent is discharged
to the OWASA - Mason Farm WWTP.
Comment: The facility sampled as required during a recent cooling water make up line
discharge that occurred during a construction incident.
Is the facility sampling performed as required by the permit (frequency, sampling type, and sampling location)? D O ■ O
Yes No NA NERecord Keeping
■ Is the ORC visitation log available and current?
■ 0 Is the ORC certified at grade equal to or higher than the facility classification?
■ 0 Is the backup operator certified at one grade less or greater than the facility classification?
■ Is a copy of the current NPDES permit available on site?
■Facility has copy of previous year's Annual Report on file for review?
Page #5
Owner - Facility: UNC Cogeneration Facility
Inspection Type: Compliance Evaluation
Permit: NC0025305
Inspection Date: 06/13/2007
Comment: DMR's are supplied monthly as required by the permit. The flow is
recorded as zero, unless there is a discharge.
June 26, 2007
Dear Mr. Mann:■
Cc:
A summary of the findings and comments noted during this inspection is provided in Section D on
Page 2 of the attached copy of the complete inspection report entitled "Water Compliance Inspection
Report”. There were no significant issues or findings noted during this inspection and therefore, a
response to this inspection report is not required.
If you have any questions concerning this report, please contact me at 919-791-4317 in the Raleigh
.Regional Office.
North Carolina Division of Water Quality
Internet: www ncwaterqualitv.org
Raleigh Regional Office - File
DWQ/Raleigh - Central Files
Subject: NPDES Compliance Inspection Report
UNC Cogeneration Facility
NPDES Wastewater Permit No. NC0025305
Orange County
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
Phone[phone]
Fax [phone]
Certified Mail # 7006 0810 0002 6048 8497
Return Receipt Requested
Mr. Bruce Runberg
Assoc. Vice Chancellor-Facilities
300 South Building, CB#1000
Chapel Hill, NC 27599-1000
Mr. Allen Johnson
Plant Manager
CB#1855, 501 Cameron
Chapel Hill, NC 27599
Mr. Timothy Aucoin
Operations Supt.
CB#1855, 501 Cameron
Chapel Hill, NC 27599
The North Carolina Division of Water Quality conducted a recent inspection of the UNC At Chapel
Hill Wastewater Treatment Facility on 6/13/2007. This inspection was conducted to verify that the
facility is operating in compliance with the conditions and limitations specified in NPDES Permit
No. NC0025305.
Mr. Richard Mann
Vice Chancellor for Finance & Administration
University of North Carolina at Chapel Hill
300 South Building, CB# 1000
Chapel Hill, NC 27599-1000
DUO
* x-
• Sincerely,
Autumn Hoban
Environmental Specialist
Attachments
NorthCarolina______Naturally
Customer Service
1-877-623-6748
1617 Mail Service Center Raleigh. NC 27699-1617
Location: 512 N. Salisbury St. Raleigh, NC 27604
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
EPA
NPDES
1 12lNC0025305
21| | I I I I I I I | | | | |
Entry Time/Date Permit Effective Date
06/09/0107/06/1310:00 AMUNC Cogeneration Facility
Exit Time/Date Permit Expiration Date501 W Cameron Ave
Chapel Hill NC 27599 11/07/3112:00 PM 07/06/13
Other Facility Data
Name, Address of Responsible Official/Title/Phone and Fax Number
Raymond E Dubose,Energy Services Chapel Hill NC 27599///
Flow Measurement
Effluent/Receiving Waters
Storm Water
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s)Agency/Office/Phone and Fax Numbers Date
Point Source Compliance Unit///Autumn
Signature of M;lement Q A Revjj
EPA Form 3560-3 (Rev 9-94) Previous ions are obsolete.
Page #1
3l
United States Environmental Protection Agency
Washington, D C. 20460
Contacted
No
yr/mo/day
07/06/13
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Agency/Office/Phone and Fax Numbers
u
Inspector
19l2l
QA
72El
Facility Self-Monitoring Evaluation Rating
70 LI
Date
C/ju /o 7
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)______
Operations & Maintenance | Records/Reports
Compliance Schedules
Inspection Type
18EJ
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES permit Number)
Fac Type
20 LIJ17
I I I I I I I I I lK
J11
Inspection Work Days
671 I 69
Transaction Code
LI 2 UJ
Remarks
I I I I I I I I I I I I I I I I I I I I I I I
73| | I74
—Reserved------------------------
75| I I I I I I I 80
Bl
71 LI
Water Compliance Inspection Report
Section A: National Data System Coding (i.e., PCS)
■ Permit
Self-Monitoring Program Facility Site Review
■ Laboratory
Hoban / t .
(cont.)1NPDES
NC0025305
STORMWATER INSPECTION COMMENTS:
PERMIT:
Page #2
yr/mo/day
07/06/13
Stormwater analytical sampling is required at the East and West detention pond outfalls at the beginning
and end of a permit term, unless there is no stormwater discharged at the facility. Sampling results from
April 2006 were reviewed and in compliance with the permit. A copy is attached to the inspection report.
The operations and maintenance of the waste treatment process is well documented in past inspections,
and not covered in this inspection, since the plant is not currently discharging waste flow to the stream.
The facility has partnered with OWASA to eliminate/reduce wastewater discharge from the CoGen Plant to
the stream. They retain the NPDES Discharge permit with an option for emergency discharge should
OWASA be unable to handle the waste flow from the facility.
Estimates on 2006 water flow diagram are: The treated wastewater (approx. 55,600 gpd), cooling water
(approx. 55,800 gpd), sanitary sewer (approx. 1,500 gpd), misc. process water (17,400 gpd), air wash water
(34,700 gpd), and demineralizer backwash water (10,000 gpd). This is a total max volume of 175,000 gpd
to OWASA - Mason Farm WWTP.
Due to a recent construction incident, approx. 975,000 gallons of cooling water makeup was discharged to
the stream and reported to DWQ. The facility has reported that the installation of a gate valve at the stream
outfall has been approved in the budget. This would allow the plant to retain spills, emergency waste flow
on-site, and further prevent the possiblity of discharges to the stream.
3I
Inspection Type
18i il£j
Secondary containment is required of section 313 of Title III Superfund Amendments and Reauthorization
Act (SARA) water priority chemicals or storage of hazardous materials to prevent leaks and spills from
contaminating stromwater runoff. Please review MSDS's. The Towerbrom 991 Microbiocide may fall under
the secondary containment requirement A.(5) Stormwater Pollution Prevention Plan b.2. PLEASE REVIEW
carefully and provide secondary containment as required.
|11 12| 07/06/13 |17
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
WASTEWATER INSPECTION COMMENTS:
Permit:1.
2.
3.
4.
5.
Page 2-1
Section D: Summary of Findings/Comments
(Attach additional sheets of narrative and checklists as necessary)
Facility Site Review:
The overall condition of the plant site was satisfactory. The appearance of the facility was in
acceptable condition indicating that the current housekeeping practices are very good.
Compliance Schedules:
The permit does not have any outstanding compliance schedules for this facility.
Self-Monitorin" Program:
You are reminded that your monitoring samples must be collected, preserved, and analyzed by
appropriate procedures and methods. You should maintain records of the sampler temperature,
and a certified laboratory must calibrate the sample thermometers annually.
Your operator is reminded that he/she must keep a logbook of all operation/maintenance
activities undertaken at the facility. The logbook should include all daily process control
activities including any field measurements conducted for process control. A visitation log for
the facility must also be maintained.
The facility is currently in compliance with these requirements.
Your permit became effective September 1, 2006 and will not expire until July 31, 2011. The
facility is not currently under a Special Order by Consent.
The permit does not contain a limit for Total Residual Chlorine (TRC). The facility application
for the permit renewal did not specify that a source of chlorine existed. Please review MSDS’s
for treatment products that contain available chlorine that are part of the waste stream.
Towerbrom 991 Cooling Water Treatment does contain chlorine, as well as, any potable water
that may be used in make-up, could contain chlorine. The DWQ policy requires facilities that
use chlorine to have a TRC limit of 17 ug/L for (WSIV - Class C Waters). Due to a recent
construction incident, approx. 975,000 gallons of cooling water makeup was discharged to the
stream and reported to DWQ. Sampling during the incident was also reported to DWQ and
showed a TRC of 0.15 mg/L. The facility reported no fish fatalies with this particular incident.
The facility or DWQ may re-open the permit to add a TRC limit, or may review information
upon permit renewal.
The permittee is reminded to read, understand and comply with all of the terms and conditions
contained in the permit. If you have questions concerning your responsibilities, call the Raleigh
Regional Office to speak to a Division of Water Quality Surface Water staff member.
Records/Reports:
a) A review of the daily monitoring data submitted during the previous 12-month period
indicates the facility was in compliance with the permit requirements and/or limitations.
The facility was issued no Penalty Assessments and no Notice(s) of Violation for the 12-
month period.
The permittee currently does not have any unpaid penalties. The permittee is reminded of
his obligation to pay any penalties levied by the State of North Carolina for non-compliance
with your NPDES permit.
http://h2o.enr.state.nc.us/tacu/WPCSDForm.doc
7.
Page 2-2
9. Pretreatment:
This facility effluent stream consists of domestic and industrial wastewater that is discharged to
OWASA-Mason Farm WWTP.
The facility is currently in compliance with these requirements. This facility is classified as
a Physical Chemical Grade 2 (PC-2), the Operator in Responsible Charge(ORC) is Timothy
Aucoin. He holds a PC-2 (Cert. No.985610), and the back up ORC holds a PC-1, The ORC
and operators of this facility do an excellent job.
The Diyision of Water Quality' records do not indicate the current ORC, Contact, and
Owner information for UNC CoGen, Energy Services Department, Please submit updated
designation information for the Primary ORC, Backup ORC, Vice Chancellor for Finance
and Administration, and Plant Operations Manager to the attention of Steve Reid with the
Division's Technical Assistance and Certification Unit using the form located here:
6. Laboratory:
For all analytical data submitted for compliance monitoring purposes, a certified laboratory
must be utilized for all laboratory analysis. Additionally, if field parameter testing is conducted,
an operator certified to perform the specified field parameter analysis is also required. The
operator needs to be sure to calibrate all meters/instrumentation before each use and retain all
calibration records.
The facility is currently in compliance with these requirements and utilizes Tritest, Inc., certified
laboratory, Cert. No. 67.
8. Effluent/Receiving Waters:
The effluent discharge should be clear with a continuous flow with no visible changes to the
receiving waters.
■e-^fUhmt-discJuuge was-elxiar andflowxvas-pryntimtous^ The receiving waters looked clear
with no visible changes from the effluent discharge.
b) The facility must designate a certified Operator-in-Responsible-Charge (ORC) having a
certification level equal to or greater than the facility classification. A Back-up ORC must
also be designated with a minimum certification level at least one level less than the facility
classification.
Flow Measurement:
If the permit requires a flow measurement device for determining the effluent flow, the flow
measurement device must be calibrated annually.
Not applicable unless an emergency wastewater discharge at the outfall is required. Flow to
OWASA is monitored in the operator control room.
This inspection did not include an evaluation of requirements for pre-treatment. The facility
should review when pre-treatment is required. The facility is obligated to meet any
requirements that may be set forth by any agreement governing the discharge to the OWASA-
Mason Farms WWTP.
b) This facility’ is conscientious and has taken proactive measures in water pollution prevention.
13. Compliance Status:
[X] Compliant □ Non-compliant □ Neither
Name and Signature of Inspector:
Page 2-3
12. Operations & Maintenance:
The following items were noted during the inspection:
11. Compliance Sampling:
Compliance sampling was not conducted during the inspection.
10. Solids Handling/Disposal:
The facility must dispose of solids by an acceptable method such as a landfill or utilize the
services of an approved solids hauling and disposal contractor, which requires the facility to be
included under the contractor’s non-discharge permit (i.e. land application). The facility is
reminded to maintain adequate records (i.e. shipment dates, quantities, etc.) of any solids
hauling and/or disposal activities.
The facility should be prepared to comply with this requirement should disposal or solids
handling be utilized in relation to this NPDES wastewater discharge permit.
^7 r"
Date
a) The facility has reported that the installation of a gate valve at the stream outfall has been
approved in the budget. The installation of this valve would allow the plant to retain spills
or emergency waste flow onsite, and further prevent the possibility of discharges to the
stream. The prompt installation of this valve is strongly recommended.
—
NiX&rtn Hoban
Surface Water Protection Section
Raleigh Regional Office
Yes No NA NEPermit
■ (If the present permit expires in 6 months or less). Has the permittee submitted a new application?
■ 0 Is the facility as described in the permit?
■ # Are there any special conditions for the permit?
■ Is access to the plant site restricted to the general public?
■ o
Compliance Schedules Yes No NA NE
■ Is there a compliance schedule for this facility?
■ Is the facility compliant with the permit and conditions for the review period?
Comment:
Operations & Maintenance Yes No NA NE
■ 0 0 Is the plant generally clean with acceptable housekeeping?
Does the facility analyze process control parameters, for ex: MISS, MCRT, Settleable Solids, pH, DO, Sludge ■
Judge, and other that are applicable?
(See Summary)
Effluent Sampling Yes No NA NE
■ Is composite sampling flow proportional?
■ Is sample collected below all treatment units?
■ Is proper volume collected?
0 ■ Is the tubing clean?
■ Is proper temperature set for sample storage (kept at 1.0 to 4.4 degrees Celsius)?
■ 0 Is the facility sampling performed as required by the permit (frequency, sampling type representative)?
Page #3
Owner - Facility: UNC Cogeneration Facility
Inspection Type: Compliance Evaluation
Permit: NC0025305
Inspection Date: 06/13/2007
Is the inspector granted access to all areas for inspection?
Comment: The permit does not contain a limit for Total Residual Chlorine (TRC). The
facility application for the permit renewal did not specify that a source of chlorine
existed. Please review MSDS’s for all treatment products that contain available chlorine
that are part of the waste stream. Towerbrom 991 Cooling Water Treatment does
contain chlorine, as well as, any potable water that may be used in make-up, could
contain chlorine. The DWQ policy requires facilities that use chlorine to have a TRC
limit of 17 ug/L for (WSIV - Class C Waters). Due to a recent construction incident,
approx. 975,000 gallons of cooling water makeup was discharged to the stream and
reported to DWQ. Sampling during the incident was also reported to DWQ and showed
a TRC of 0.15 mg/L. The facility reported no fish fatalities with this particular incident.
The facility or DWQ may re-open the permit to add a TRC limit, or may review
information upon permit renewal, (see comments section)
Comment: The ORC does an excellent job. This facility is conscientious and proactive
in water pollution prevention.
♦
Yes No NA NE
Yes No NA NE
Comment:
Yes No NA NELaboratory
■ Are field parameters performed by certified personnel or laboratory?
■ □00Are all other parameters(excluding field parameters) performed by a certified lab?
■ non# Is the facility using a contract lab?
0 n ■Is proper temperature set for sample storage (kept at 1.0 to 4.4 degrees Celsius)?
D 0 O ■Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
D 0 ■Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees?
Comment:
Yes No NA NERecord Keep!ng
■ nonAre records kept and maintained as required by the permit?
■ 000Is all required information readily available, complete and current?
■ ODDAre all records maintained for 3 years (lab. reg. required 5 years)?
■ nonAre analytical results consistent with data reported on DMRs?
■ nooIs the chain-of-custody complete?
Dates, times and location of sampling
Name of individual performing the sampling
Results of analysis and calibration
Dates of analysis
Name of person performing analyses
Transported COCs
■ nonAre DMRs complete: do they include all permit parameters?
n n o ■Has the facility submitted its annual compliance report to users and DWQ?
0 ■ 0(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator on each shift?
Page #4
I
Upstream / Downstream Sampling
Is the facility sampling performed as required by the permit (frequency, sampling type, and sampling location)? 0 ■
Owner - Facility: UNC Cogeneration Facility
Inspection Type: Compliance Evaluation
Permit: NC0025305
Inspection Date: 06/13/2007
The facility normally has no discharge to the stream. The plants effluent is discharged
to the OWASA - Mason Farm WWTP.
Effluent Sampling
Comment: The facility sampled as required during a recent cooling water make up line
discharge that occurred during a construction incident.
♦
Permit: NC0025305
Inspection Date: 06/13/2007
Yes No NA NERecord Keeping
■ Is the ORC visitation log available and current?
■ oIs the ORC certified at grade equal to or higher than the facility classification?
■ Is the backup operator certified at one grade less or greater than the facility classification?
■ Is a copy of the current NPDES permit available on site?
■Facility has copy of previous year's Annual Report on file for review?
Page #5
Owner - Facility: UNC Cogeneration Facility
Inspection Type: Compliance Evaluation
Comment: DMR's are supplied monthly as required by the permit. The flow is
recorded as zero, unless there is a discharge.
t
1
©©[PY
August 8Z 2007
Subject: Authorization to Construct Exemption
Dear Mr. Wakild:
■ Construction of permitted treatment facilities.
V
THE UNIVERSITY
of NORTH CAROLINA
at CHAPEL HILL
ENERGY SERVICES
DEPARTMENT
Charles Wakild, Regional Supervisor
Surface Water Protection Section
Raleigh Regional Office
1628 Mail Service Center
Raleigh, NC 27699-1628
RAYMOND E. DUBOSE
Director
73 0 AIRPORT ROAD
CAMPUS BOX 1855
CHAPEL HILL. NC 27599-1855
T 919.966.4100
F 9J9-843-7328
E Kay. Hu Bose tii. energy.une.edu
Based upon a review of the North Carolina Department of Environment and Natural
Resources, Division of Water Quality (DWQ) Authorization to Construct Guidance
Document, it is our understanding that any activity defined below will require an
Authorization to Construct (ATC):
- 9 PW
The University of North Carolina at Chapel Hill is currently constructing a new
steam tunnel to replace two existing tunnels carrying steam from the Cogeneration
Facility to the UNC campus. To maintain continuous service to the campus, one of
the two existing tunnels will remain in service while the new steam tunnel is
constructed. The new steam tunnel will be aligned to the tunnel taken out of service
to avoid impacting the remaining in-service tunnel.
■ The addition, deletion or modification of equipment, components or processes at
an existing facility which has the potential to affect the treatment process.
■ Upgrade or replacement of older equipment of a different capacity (other than
what was originally permitted), or
■ Installation of piping which may by-pass equipment, components or processes
A fc.
0 I
The alignment of the new tunnel impacts the north side of an existing Stormwater
Pond on the east side of the Cogeneration Facility. The University plans to proceed
with a like kind replacement of the existing pond.
I
Sincerely,
RED/tla
Cc:
Allen Johnson
Stan Taylor
William Lowery
Raymond E. DuBose
Director, Energy Services
Since this is a like-kind replacement that does not change the capacity of the facility,
result m any by-passes, or have the potential to affect the treatment process, it is our
interpretation that an ATC is not required for this project.
If you have any questions or i
Timothy L. Aucoin at [phone].
require any additional information, please contact
1
Bcc:
Kara Simmons
Richard Miller
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