20170799 Ver 1_Major Variance_20171108

PREPARED FOR:
CITY OF DURHAM - DEPARTMENT OF WATER MANAGEMENT
1600 MIST LAKE DRIVE
DURHAM, NC 27704
MIST LAKE FACILITIES EXPANSION
VARIANCE REQUEST
AUGUST 2017
PREPARED BY:
TIMMONS GROUP .•••••0
YOUR VISION ACHIEVED THROUGH OURS. • • 0
1001 BOULDERS PARKWAY, SUITE 300
RICHMOND, VIRGINIA 23225
PHONE: [phone]
FAX: [phone]
WWW.TiMMONS.COM
P.N. 39722.001

EXECUTIVE SUMMARY
On behalf of the City of Durham — Department of Water Management (Applicant),
Timmons Group is submitting this Variance Request for the expansion of its Mist Lake Facilities
(Project). The proposed Project is situated on a 55 -acre parcel and consists of the construction
of two buildings totaling approximately 116,000 square feet: one to house the administration,
warehouse, and the other to hold the equipment maintenance shop, as well as appurtenant
facilities (utilities, stormwater, etc.).
The purpose of the proposed Project is to expand the existing facility at Mist Lake, in
order to accommodate multiple City of Durham Department of Water Management (DWM)
divisions and allow for potential moderate growth over the next 20 years. The DWM Mist Lake
Facilities Expansion project consists of two buildings totaling approximately 116,000 square
feet, which will consist of a building for the administration (which will provide office space for the
five divisions), and a warehouse, shops, and laydown area to store equipment when not in use
or undergoing repair for the maintenance division. The Project is consistent with the zoning
requirements for this area (IL - industrial) and is being undertaken to consolidate multiple
divisions that at present are located across Durham in one location, which will create cost,
logistical, and overall savings for the locality.
This property has been owned since January 1997, and its purchase was intended for
this proposed Project. If the City cannot use the existing property to consolidate the five
divisions then the initial investment on the purchase of the property will be lost, additional
property will need to be purchased to relieve the additional space requirements needed at the
remote facilities, as well, the property cannot be used to consolidate the multiple divisions in one
location. Logistically this will cause inefficiencies, create other impacts associated with the
development of another greenfield property that are significantly more than the proposed
Project, and will not solve the original problems that were the impetus of consolidating the
divisions at one location.
To accomplish the goals of the Project, impacts to the Riparian Buffer are unavoidable.
A total of area of 24,935 square feet (SF) of unavoidable permanent impacts to riparian buffer is
necessary (Zone 1 — 13,083, Zone 2 — 11,852SF).
These unavoidable impacts will be mitigated through the purchase of compensatory
buffer credits through an approved wetland mitigation bank. The total compensatory mitigation
proposed is 57,027 SF of buffer credits. The purchase of this compensatory mitigation will
ensure the unavoidable impacts proposed by the Project and will not result in a buffer loss that
will affect the water quality within the watershed.
Variance Request Timmons Group
Mist Lake Facilities Expansion August 2017
Page i

MIST LAKE FACILITIES EXPANSION
VARIANCE REQUEST
TABLE OF CONTENTS
EXECUTIVE SUMMARY............................................................................................................ i
1.0 PROJECT INFORMATION SHEET................................................................................ 2
2.0 INTRODUCTION............................................................................................................ 3
3.0 SITE DESCRIPTION...................................................................................................... 3
3.1 Site Location............................................................................................... 3
3.2 Site Conditions........................................................................................... 3
4.0 PURPOSE AND NEED.................................................................................................. 4
6.0 RIPARIAN BUFFER IMPACTS...................................................................................... 4
7.0 DEMONSTRATION OF NEED FOR VARIANCE/AVOIDANCE AND MINIMIZATION ... 4
8.0 COMPENSATORY MITIGATION................................................................................... 6
FIGURES
Figure 1 Vicinity Map
Figure 2 FEMA Map
Figure 3 Jurisdictional Waters of the U.S. Impact Map
APPENDICES
Appendix A Variance Application
Appendix B Wetland Delineation Information
Appendix C Proposed Layout and Preliminary Stormwater Plans
Appendix D Original Layout
Appendix E Compensatory Mitigation Documents
Variance Request Timmons Group
Mist Lake Facilities Expansion August 2017
Page ii

1.0 PROJECT INFORMATION SHEET
Anticipated Permit Authorizations
• U.S. Army Corps of Engineers: NWP 39 — Commercial and Institutional Developments
• NC Department of Water Resources: 401 Water Quality Certification/Buffer Compliance
General
Project Name:
Mist Lake Facilities Expansion
State:
North Carolina
Location:
Durham County
Latitude:
36'01' 16.27" North (36.021)
Longitude:
-78'51'31.70" West (-78.858)
Subject Property Size:
55 acres (Study Area approximately 85-95 acre)
Limits of Disturbance:
21 acres (Project Area)
HUC Code:
03020201 (Upper Falls Lake, Neuse)
Waterbodies on Property:
UNT to Goose Creek and Palustrine forested (PFO) wetlands.
Correspondina Information
USGS Quad
Northeast Durham
USDA Soils Map:
http://websoilsurvey.nres.usda.gov/app/HomePage.htm
County:
Durham County, VA
Applicant
Name:
City of Durham — Department of Water Management
Address:
101 City Hall Plaza
Durham, NC 27701
Contact:
Mr. Donald Greeley, Director
Telephone:
[phone]
Email:
[e-mail]
Agent
Name:
Address:
Contact:
Telephone:
Email:
Variance Request
Mist Lake Facilities Expansion
Page 2
Timmons Group
1001 Boulders Parkway, Suite 300
Richmond, Virginia 23225
Mr. Todd Preuninger
[phone]
todd.preuninger(aDtimmons.com
Timmons Group
August2017

2.0 INTRODUCTION
On behalf of the City of Durham — DWM (Applicant), Timmons Group is submitting this
Variance Request for the expansion of its Mist Lake Facilities (Project). The proposed Project is
situated on a 55 -acre parcel and consists of the construction of two buildings totaling
approximately 116,000 square feet: one to house the administration, warehouse, and the other
to hold the equipment maintenance shop, as well as appurtenant facilities (utilities, stormwater,
etc.).
3.0 SITE DESCRIPTION
3.1 Site Location
The site encompasses approximately 55 acres and is located at 1600 Mist Lake Drive, in
Durham County, North Carolina (see Figure 1: Vicinity Map). It is bound by 1-85 to the south,
an unnamed tributary to the west, and Camden Road to the north. The site is located within the
Neuse River Watershed (HUC 03020201) and entirely within the Piedmont Physiographic
Province.
The adjacent lands are composed of primarily industrial properties intermixed with
undeveloped land. The Project drains to unnamed tributaries, where surface waters enter into
Goose Creek. Surface waters from Goose Creek flow north to Ellerbee Creek before
discharging into Falls Lake, northeast of the Project.
A FEMA Flood Rate Insurance Map (FIRM) is included for review (Figure 2: FEMA FIRM
Map). The map shows that the Project area is located within an area identified as a X flood
zone. This designation by FEMA means the area is a minimal flood hazard, and is above the
500 -year flood level. Please note that a majority of the site has been designated as an "AE"
type flood zone with a 1% chance of annual flood hazard. The Project has been designed to
comply with applicable FEMA -approved state and local floodplain management requirements
and no increase in the 100 -year flood elevations is anticipated.
3.2 Site Conditions
The site currently houses several divisions of the DWM in a 20 -acre facility, along with
associated vehicles, equipment and inventory. The undeveloped areas, mainly along the
floodplain, are dominated by mid -successional mixed pine and hardwood forest with mixed
hardwoods adjacent to the drainage ways. The topography slopes gradually from the
southwestern corner to the north and east portion of the project limits.
The property was delineated by McAdams, during the Summer of 2017. Jason
Robinson, DWR, confirmed the Neuse Riparian Buffer locations on June 28, 2017, and a JD
request has been sent to Samantha Dailey, USACE. Documents pertaining to the wetland
delineation are provided in Appendix B: Wetland Delineation Information.
There are no wetlands, open water, stream and associated upland buffers within the
Project area that are under a deed restriction, conservation easement, restrictive covenant, or
other land use protective instrument.
Variance Request Timmons Group
Mist Lake Facilities Expansion August2017
Page 3

4.0 PURPOSE AND NEED
The purpose of the proposed Project is to expand the existing facility at Mist Lake, in
order to accommodate multiple City of Durham DWM divisions and allows for potential growth
over the next 20 years. The Department of Water Management Mist Lake Facilities Expansion
project consists of two buildings totaling approximately 116,000 square feet: one to house the
administration, warehouse, and shops and the other to hold the equipment maintenance shop.
The Project is consistent with the zoning requirements for this area (IL - industrial) and is being
undertaken to consolidate multiple divisions at one location.
The DWM currently operates several of its divisions at 1600 Mist Lake Drive (North
Campus). This 20 -acre facility houses approximately 82 staff of the Administration, Plant
Engineering & Maintenance, Regulatory Compliance, and Utility Engineering divisions of the
Department, along with associated vehicles, equipment, and inventory. Currently, 145 DWM
Water & Sewer Maintenance (WSM) employees are co -housed at a second location on Martin
Luther King, Jr. Drive, the Public Works Operations Center (PWOC) along with Public Works
staff. The WSM workgroups at PWOC are responsible for Outfall Maintenance, Rehabilitation
Maintenance, Meter Reading, Meter Maintenance, Service Installations, and Mainline
Installations, along with the necessary vehicles, light and heavy equipment, and inventory to
maintain and operate approximately 2,600 miles (combined) of water and sewer mains, 8,148
hydrants, 25,896 water valves, and more than 83,000 water meters. The project will expand the
DWM Mist Lake facility to accommodate the relocation of the WSM Division from the PWOC
facility to the Mist Lake complex and potential growth over the next 20 years.
6.0 RIPARIAN BUFFER IMPACTS
To accomplish the goals of the Project, impacts to the Riparian Buffer are unavoidable.
The location of impacts to the Neuse Riparian Buffer are shown on the attached Impacts Map
(Figure 3: Mist Lake Facility Expansion — Buffer Impacts Map — Sheets 1 - 3). A jurisdictional
determination for this area will be provided under separate cover.
Therefore, to accomplish the goals of the Project, a total of area of 24,935 square feet (Zone 1 —
13,083, Zone 2 — 11,852SF) of unavoidable permanent impacts to riparian buffer is necessary.
The stormwater and utility plans are included in Appendix C: Preliminary Stormwater Plans.
7.0 DEMONSTRATION OF NEED FOR VARIANCE/AVOIDANCE AND MINIMIZATION
Impacts to jurisdictional features and buffers were avoided and minimized to the
maximum extent practicable by incorporating resourceful site planning, including the utilization
of the wetland delineation to adjust the layout to avoid and minimize impacts. Avoidance and
minimization were also accomplished during the design phase of the Project. The Applicant has
avoided and minimized impacts to greatest extent practicable given the Project's Purpose and
Need. The proposed 24,935 square feet of stream buffer impacts are the result of the
necessary infrastructure and facility layout, without which, the Project goals would not be
realized.
Variance Request Timmons Group
Mist Lake Facilities Expansion August2017
Page 4

This property has been owned since January 1997 and its purchase was intended for
this proposed Project. If the City cannot use the existing property to consolidate the five
divisions then the initial investment on the purchase of the property will be lost, additional
property will need to be purchased to relieve the additional space requirements needed at the
remote facilities, as well, the property cannot be used to consolidate the multiple divisions in one
location. Logistically this will cause inefficiencies, create other impacts associated with the
development of another greenfield property that are significantly more than the proposed
Project, and will not solve the original problems that were the impetus of consolidating the
divisions at one location. In order to provide adequate space for parking and buildings, a
minimum of 21 acres of buildable land is necessary. The southwestern portion of the site is
relatively narrow and is constrained by setbacks along the Interstate and wetlands to the north.
A stream and its corresponding buffer bi-sect the property in this area and cannot be avoided.
An additional constraint to the site is the need to provide access for emergency vehicles
in the event of a fire. To comply with current IFC and local fire codes, pavement is proposed
around the site, such that fire apparatus vehicles have access to within 150 feet from all parts of
the building. To comply with this requirement, impacts to the buffer cannot be avoided.
Offsite alternative sites were explored for this Project; however, in order to provide
adequate building space and parking for all divisions, at least 21 acres of buildable land are
needed, as well as an adjacent roadway infrastructure that supports heavy truck use. The
current location allows for future growth, provides better utilization of existing personnel and
equipment, utilizes parts/tools warehousing and non -duplication of housing parts, provides for
better internal communication between divisions, and provides protection of parked vehicles and
equipment during flooding, which is now experienced at the current location of the Public Works
WSM Division, located southwest of this facility. In addition, the proposed layout provides more
acceptable storage and in-house work area conditions (e.g. dedicated pedestrian walkways),
which provides for a safer work environment for personnel, while utilizing the existing utility and
road infrastructure.
Given the design constraints associated with a shared use facility (i.e. administration
buildings, maintenance warehouses, work vehicles, equipment storage) and the local zoning
requirements, the applicant has minimized impacts to the greatest extent practicable.
Specifically, there is a setback associated with Interstate 85 along the southern property
boundary. This 50 -foot setback limited useable space for parking and buildings along the
southern property line and pushed the development to the north, towards the wetlands and
stream buffer. Moreover, the southwestern portion of the property is bisected by a
stream/buffer, and in order to provide space for a building and parking, buffer impacts could not
be avoided. The applicant explored the use of retaining walls along the northern portion of the
parking lot; however, this option provided very limited avoidance, as space is still needed for
parking and emergency vehicle access. Furthermore most of the vehicles and equipment being
stored at the site are large construction vehicles and equipment, which required more storage
area than a passenger car or truck. Construction equipment and vehicles require more space to
maneuver (i.e. larger turning radii, larger parking areas, etc.), as well, when being serviced
these vehicles require large services bays, as well as additional areas with the lay down area for
the large equipment (lifts, hoists, cranes, etc.) needed to service the larger equipment.
Therefore, the typical parking requirements for an office building do not apply, and are
considerably larger based on the type and number of pieces of equipment.
Variance Request Timmons Group
Mist Lake Facilities Expansion August2017
Page 5

Approximately 368 parking spaces are required for the site. This includes parking for the
visitors, employees, and fleet vehicles (both large and small), as well as the additional handicap
spaces required by the City Ordinance.
The original layout (Appendix D — Original Layout) proposed additional impacts to the
wetlands and a stream channel in the northern portion of the property for an entrance road and
the proposed fill slope for the parking areas and pad sites extended into the wetlands in the
central portion of the property. The layout was re -designed, in order to avoid impacts to the
forested wetlands and stream channel through the use of retaining walls.
The entrance road from Camden Avenue is a safety requirement, in order to provide
safe ingress and egress, as well as allow for multiple access points for emergency responders
(i.e. fire, EMS, etc.). The road was re -located in an area that avoids impacts to streams and
wetlands. Moreover, stream impacts have been completely avoided through the use of a
bridge.
Other measures taken to minimize impacts include the use of a suite of stormwater
devices (e.g. underground sand filters, underground detention, and filter strips) for stormwater
treatment. This reduced the need for detention ponds, which further reduced and minimized the
impacts to the adjacent stream channels, wetlands, and/or riparian buffers.
A project -specific Erosion and Sediment Control (ESC) plan will be developed and
submitted to Durham for approval of the land disturbing activity. The ESC plan will be prepared
in accordance with the North Carolina Erosion & Sediment Control Laws and Regulations and
the most current version of the Erosion & Sediment Control Planning and Design Manual. The
ESC plan will be approved by the locality prior to any land -disturbing activity associated with the
Project. All regulated land -disturbing activities associated with the Project, including on- and off-
site access roads, staging areas, borrow areas, stockpiles, and soil intentionally transported
from the Project Area will be covered by the project specific ESC plan. During construction
activities, the ESC Best Management Practices (BMPs) will be inspected and maintained
throughout the life of the construction activity providing for enhanced protection for the avoided
jurisdictional areas and further minimizing impacts to the aquatic resources.
8.0 COMPENSATORY MITIGATION
Compensatory mitigation for these unavoidable impacts will be achieved through the purchase
of off-site mitigation credits from a mitigation bank, which is approved for use in the Neuse
Watershed (Hydrologic Unit Code 03020201). Buffer mitigation credits will be purchased using
the Standard Compensatory Mitigation Ratios at ratios of 3:1 for Zone 1 (39,249 SF) and 1.5:1
for Zone 2 (17,778 SF). This equates to a total compensatory mitigation obligation of 57,027 SF
of buffer credits. Credit availability letters from the North Fork Little River Buffer Bank an
approved wetland and stream mitigation bank located in HUC 03020201, are located in
Appendix E: Compensatory Mitigation Documents.
Variance Request Timmons Group
Mist Lake Facilities Expansion August2017
Page 6

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Impacts Table
Impact ID
Riparian Buffer (sq. ft)
Impact
Temporary
Permanent
B 1-Z1
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B 1-Z2
5- CIO] J
11,852
Total
0 sq ft
24,935 sq ft
0.00 ac
0.57 ac
Legend
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Project Study Limits
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Limits of Disturbance - 21 Acres
5- CIO] J
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Riparian Buffer Zone 1 Impact
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Neuse Riparian Buffer Zone 1 Impact
it
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-
Wetland
Pond
\ 16111 3
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Path: R:\805\39722.001 -Mist Lake\GIS\Wetland Impacts\MistLake-WTIM_Notes.mxd
These plans and associated documents are the exclusive property of TIMMONS GROUP and may not be reproduced in whole or in part and shall not be used for any purpose whatsoever, inclusive, but not
limited to construction, bidding, and/or construction staking without the express written consent of TIMMONS GROUP.
Legend
C:.11 Project Study Limits
a®� Limits of Disturbance - 21 Acres
Riparian Buffer Zone 1 Impact
® Riparian Buffer Zone 2 Impact
Stream Centerline
Stream Top of Bank
--- Retaining Wall
= m Neuse Riparian Buffer
Neuse Riparian Buffer Zone 1 Impact
® Neuse Riparian Buffer Zone 2 Impact
= Wetland
® Pond
NOTES:
1. WATERS OF THE U.S. WITHIN THE PROJECT STUDY
LIMITS ARE SOURCED FROM MCADAMS
2. WATERS OF THE U.S. HAVE NOT BEEN CONFIRMED
BY
THE U.S. ARMY CORPS OF ENGINEERS.
3. PROJECT LIMITS ARE APPROXIMATE.
4. TOPOGRAPHY BASED ON USGS LIDAR DATA.
Impacts Table
Riparian Buffer (sq. ft)
Impact ID Impact
Temporary Permanent
B 1-Z1 13, 083
B1 -Z2 11,852
0 sq ft 24, 935 sq ft
Tota I
0.00 ac 0.57 ac
TIMMONS G
r THIS DRAW ING PREPARED AT THE
� VOURwpN OURS CORPORATE OFFICE
IdllVl'yTMRapH
'�F 10018oultlers Parkway, Suite 3001 Richmontl, VA 23225
� TEL 80/.Y00.6500 FAX [phone] www.timmons.com
Site Development I Residential I Infrastructure I Technology I Environmental
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MIST LAKE FACILITIES EXPANSION
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PRELIMINARY NEUSE RIPARIAN BUFFER IMPACTS MAP - NOTES
These plans and associated documents are the exclusive property of TIMMONS GROUP and may not be reproduced in whole or in part and shall not be used for any purpose whatsoever, inclusive, but not
limited to construction, bidding, and/or construction staking without the express written consent of TIMMONS GROUP.

SIOLM.el:40

APPENDIX A
VARIANCE REQUEST FORM

State of North Carolina
DWR Department of Environment and Natural Resources
Division of Water Resources
]Division of Water Resources
15A NCAC 02B .0233 (8)(b), .0243 (8)(b), .0250 (11)(b), .0259 (8)(b), .0267 (11)(c), .0607 (e)(2)
Protection and Maintenance of Riparian Areas Rules - Variance Application
FORM: VAR 10-2013
PLEASE IDENTIFY WHICH RIPARIAN AREA PROTECTION RULE APPLIES:
X Neuse River Basin (15A NCAC 02B.0233)
x Major Variance ❑ Minor Variance
❑ Catawba River Basin (15A NCAC 02B.0243)
❑ Randleman Lake Water Supply Watershed (15A NCAC 0213.0250)
❑ Major Variance ❑ Minor Variance
❑ Tar -Pamlico River Basin (15A NCAC 0213.0259)
❑ Major Variance ❑ Minor Variance
❑ Jordan Lake Water Supply Nutrient Strategy (15A NCAC 0213.0267)
❑ Major Variance ❑ Minor Variance
❑ Goose Creek Watershed (15A NCAC 0213.0606 & 15A NCAC 0213.0607)
A. General Information
1. Applicant's Information(if other than the current property owner):
Name: City of Durham — Department of Water Management
Title: Attn: Mr. Don Greeley - Director
Street Address: 1600 Mist Lake Drive
City, State & Zip
Telephone:
Durham, NC 27704
919-560-4381
Email: [e-mail]
2. Property Owner/Signing Official (person legally responsible for the property and its compliance):
Name:
Title:
Street Address:
City, State & Zip:
Telephone:
Email:
FORM: VAR 10-2013

3. Agent Information:
3a. Name:
Company Affiliation:
Street Address:
City, State & Zip:
Telephone:
E-mail:
Todd Preuninger
1001 Boulders Parkway, Suite 300
Richmond. VA
804-200-6399
[e-mail]
3b. Attach a signed and dated copy of the Agent Authorization letter if the Agent has signatory authority for the owner.
4. Project Name (Subdivision, facility, or establishment name):
Mist Lake Facility Expansion
5. Project Location:
5a. Street Address
City, State & Zip:
5b. County:
Mist Lake D
Durham, NC 27704
Durham
5c. Site Coordinates (in decimal degrees): 36.021 Latitude -78.8595 Longitude
5d. Attach an 8 % x 11 excerpt from the most recent version of the USGS topographic map indicating the location of the site.
5e. Attach an 8 % x 11 excerpt from the most recent version of the published County NRCS Soil Survey Map depicting the
project site.
6. Property Information:
6a. Property identification number (parcel ID): 0842-09-16-0876 (DB 7997, pg. 68), 0842-09-16-3052 (DB 8055, pg. 544), 0842-
09-16-5055 (DB 8006, pg. 182), 0842-09-16-0876 (DB 7997, pg. 68), 0842-09-16-8832 (DB 1630, pg. 228), 0842-09-16-8832 (DB
6b. Date property was purchased: January 1, 1997 (please note that a portion of the project extends into an adjacent property
that was purchased in September 2016, however the buffer extends across both parcels).
6c. Deed book and page number
6d. Map book
and page number
6e. Attach a copy of the recorded map that indicates when the lot was last platted.
7. Is your project in one of the 20 Coastal Counties covered under the Coastal Area Management Act (CAMA)?
❑ YES x NO
7a. If you answered yes above, in which AEC do you fall (30 ft or 75 ft)?
7b. If you answered yes above, what is the total percent of impervious cover that you have proposed within the AEC?
FORM: VAR 10-2013 Page 2 of 7

8. Directions to site from nearest major intersection:
The site is located south of the intersection of E. Club Boulevard (SR1669) and Camden Road (SR1671) at 1600 Mist Lake Drive,
in Durham, NC (vicinity map attached).
9. Stream associated with riparian buffer to be impacted by the proposed activity:
Name Water Quality Classification
UT to Goose Creek WS -IV, NSW
9a. For Goose Creek only: Is the buffer in the 100 -year floodplain? ❑ YES NO
10. List any permits/approvals that have been requested or obtained for this project in the past (including all prior phases).
Date Applied: Date Received: Permit Type:
B. Proposed Activity
1. Project Description
1a. Provide a detailed description of the proposed activity including its purpose:
The purpose of the proposed project is to expand the existing facility at Mist Lake, in order to accommodate multiple City of
Durham Department of Water Management (DWM) divisions and allow for potential moderate growth over the next 20
years. The DWM Mist Lake Facility Expansion prosect consists of two buildings totaling approximately 116,000 square feet,
which will consist of a building for the administration (which will provide office space for the five divisions), a warehouse,
shops, and laydown area to store equipment when not in use or undergoing repair for the maintenance division. The
project is consistent with the zoning requirements for this area (IL - industrial) and is being undertaken to consolidate
multiple divisions that at present are located across Durham in one location, which will create cost, logistical, and overall
savings for the locality.
TheDWM currently operates several of its divisions at 1600 Mist Lake Drive (North Campus). This 20 -acre facility houses
approximately 82 staff of the Administration, Plant Engineering & Maintenance, Regulatory Compliance, and Utility
Engineering divisions of the Department, along with associated vehicles, equipment, and inventory. Currently, 145 DWM
Water & Sewer Maintenance (WSM) employees are co -housed at a second location on Martin Luther King, Jr. Drive, the
Public Works Operations Center (PWOC) along with Public Works staff. The WSM workgroups at PWOC are responsible for
Outfall Maintenance, Rehabilitation Maintenance, Meter Reading, Meter Maintenance, Service Installations, and Mainline
Installations, along with the necessary vehicles, light and heavy equipment, and inventory to maintain and operate
approximately 2,600 miles (combined) of water and sewer mains, 8,148 hydrants, 25,896 water valves, and more than
83,000 water meters. The project will expand the DWM Mist Lake facility to accommodate the relocation of the WSM
Division from the PWOC facility to the Mist Lake complex and potential growth over the next 20 years, without additional
impacts.
FORM: VAR 10-2013 Page 3 of 7

1b. Attach a site plan showing the following items as applicable to the project:
0 Development/Project name
0 Revision number & date
0 North arrow
0 Scale (1" = 50' is preferred)
0 Property/project boundary with dimensions
0 Adjacent streets and roads labeled with names and/or NC State Road numbers
0 Original contours and proposed contours
0 Perennial and intermittent streams, ponds, lakes, rivers and estuaries
0 Mean high water line (if applicable)
0 Wetlands delineated, or a note on plans that none exist
0 Location of forest vegetation along the streams, ponds, lakes, rivers and estuaries
0 Extent of riparian buffers on the land including Zone 1 and Zone where applicable
0 Location and dimension of the proposed buffer impact (label the area of buffer impact in ft' on the plan)
0 Details of roads, parking areas, cul-de-sacs, sidewalks, and curb and gutter systems
0 Footprint of any proposed buildings or other structures
0 Discharge points of gutters on existing structures and proposed buildings
0 Existing drainage (including off-site), drainage easements, and pipe dimensions
0 Drainage areas delineated
C. Proposed Impacts and Mitigation
1. Individually list the square footage of each proposed impact to the protected riparian buffers:
Buffer Impact
Number'—
Permanent (P) or
Temporary (T)
Reason for Impact
Buffer Zone 1 Impact Zone 2 Impact
Mitigation (square feet) (square feet)
Required
61 -EP ❑ T
Parking/Fire Lane
x Yes ❑ No 13,083 11,852
B2 - ❑P ❑T
Mitigation
❑ Yes oNo
B3 - ❑P ❑T
❑ Yes oNo
Total Buffer Impacts 24,935
'Label on site plan
2. Identify the square feet of impact to each zone of the riparian buffer that requires mitigation from the table above. Calculate
the amount of mitigation required.
'For projects in the Goose Creek Watershed, list all riparian buffer impacts as Zone 1
and use Zone 1 multiplier.
3. Provide a description of how mitigation will be achieved at your site pursuant to the mitigation requirements of the applicable
river basin/watershed.
Compensatory mitigation for these unavoidable imaacts will be achieved through the Durchase of off-site mitigation credits
from a mitigation bank, which is approved for use in the Neuse Watershed (Hydrologic Unit Code 03020201). Buffer mitigation
credits will be purchased using the Standard Compensatory Mitigation Ratios at ratios of 3:1 for Zone 1 (39,249 SF) and 1.5:1 for
Zone 2 (17.778 SF). This eauates to a total comDensatory mitieation oblieation of 57.027 SF of buffer credits. Credit availabilitv
FORM: VAR 10-2013 Page 4 of 7
Required
Zone
Total Impact
Multiplier
Mitigation
(square feet)
(square feet)
Zone 1'
13,083
3
39,249
(2 for Catawba only)
Zone 2
11,852
1.5
17,778
Total Buffer Mitigation Required:
57,027
'For projects in the Goose Creek Watershed, list all riparian buffer impacts as Zone 1
and use Zone 1 multiplier.
3. Provide a description of how mitigation will be achieved at your site pursuant to the mitigation requirements of the applicable
river basin/watershed.
Compensatory mitigation for these unavoidable imaacts will be achieved through the Durchase of off-site mitigation credits
from a mitigation bank, which is approved for use in the Neuse Watershed (Hydrologic Unit Code 03020201). Buffer mitigation
credits will be purchased using the Standard Compensatory Mitigation Ratios at ratios of 3:1 for Zone 1 (39,249 SF) and 1.5:1 for
Zone 2 (17.778 SF). This eauates to a total comDensatory mitieation oblieation of 57.027 SF of buffer credits. Credit availabilitv
FORM: VAR 10-2013 Page 4 of 7

letters from the North Fork Little River Buffer Bank, an approved wetland and stream mitigation bank located in HUC 03020201,
are located in Appendix E: Compensatory Mitigation Documents.
3a. Is buffer restoration or enhancement proposed? ❑ Yes x No
If yes, attach a detailed planting plan to include plant type, date of plantings, the date of the one-time fertilization in the
protected riparian buffers, and a plan sheet showing the proposed location of the plantings.
3b. Is payment into a buffer restoration fund proposed? x Yes ❑ No
If yes, attach an acceptance letter from the mitigation bank you propose to use or the NC Ecosystem Enhancement
Program stating they have the mitigation credits available for the mitigation requested.
D. Stormwater
1. Provide a description of how diffuse flow will be maintained through the protected riparian buffers (e.g., re -planting vegetation
or enhancement of existing vegetation, gutter splash pads, level spreader to control of runoff from impervious surfaces, etc.).
Stormwater will be treated with 4 underground sand filters in conjunction with 2 UG detention systems and will be released at
non-erosive flow into the buffer or wetlands. Additional details are provided in Appendix C — Preliminary Stormwater Plans.
1a. Show the location of diffuse flow measure(s) on your site plan.
1b. Attach a completed Level Spreader Supplement Form or BMP Supplement Form with all required items for each proposed
measure.
1c. Attach an Operation and Maintenance (O&M) Form for each proposed level spreader or BMP.
2. For Major, Catawba, and Goose Creek variance requests, provide a description of all best management practices (BMPs) that
will be used to minimize disturbance and control the discharge of nutrients and sediments from stormwater.
Stormwater will be treated with four underground sand filters in conjunction with two UG detention systems and will be
released at non-erosive flows into the buffer or wetlands though filter strips. Additional details are provided in Appendix C —
Layout and Preliminary Stormwater Plans.
2a. Show the location of BMPs on your site plan.
2b. Attach a Supplement Form for each structural BMP proposed.
2c. Attach an Operation and Maintenance (O&M) Form for each structural BMP proposed.
E. Demonstration of Need for a Variance
The variance provision of the riparian buffer rules allows the Division or the Environmental Management Commission to grant a
variance when there are practical difficulties or unnecessary hardships that prevent compliance with the strict letter of riparian
buffer protection.
1. Explain how complying with the provisions of the applicable rule would prevent you from securing a reasonable return from or
make reasonable use of your property. Merely proving that the variance would permit a greater profit from the property shall
not be considered adequate justification for a variance. The Division will consider whether the variance is the minimum possible
deviation from the terms of the applicable Buffer Rule that shall make reasonable use of the property possible.
In order to provide adequate space for parking and buildings, a minimum of 21 acres of buildable land is necessary. The
southwestern portion of the site is relatively narrow and is constrained by setbacks along the Interstate and wetlands to the
north. A stream and its corresponding buffer bi-sect the property in this area and cannot be avoided. This property has been
owned orior to Julv 1997. and its current and or000sed use was intended for this oroiect. If the Citv cannot use the existing
FORM: VAR 10-2013 Page 5 of 7

propertV to consolidate the five divisions then the initial investment on the purchase of the property will be lost, additional
Property will need to be purchased to relieve the additional space requirements needed at the remote facilities, as well, the
property cannot be used to consolidate the multiple divisions in one location. Logistically this will cause inefficiencies, create
other impacts associated with the development of another greenfield property that are significantly more than the proposed
project, and will not solve the original problems that were the impetus of consolidating the divisions at one location.
2. Explain how the hardship results from application of the Buffer Rule to the property rather from other factors such as deed
restrictions or other hardships (e.g. zoning setbacks, floodplains, etc).
Given the design constraints associated with a shared use facility (i.e. administration buildings, maintenance warehouses, work
vehicles, equipment storage) and the local zoning requirements, the applicant has minimized impacts to the greatest extent
practicable. Specifically, there is a setback associated with Interstate 85 along the southern propertV boundary. This 50 -foot
setback limited useable space for parking and buildings along the southern propertV line and pushed the development to the
north. towards the wetlands and stream buffer. Moreover. the southwestern portion of the property is bisected by a
stream/buffer, and in order to provide space for a building and parking, buffer impacts could not be avoided. The applicant
explored the use of retaining walls along the northern portion of the parking lot; however, this option provided very limited
avoidance, as space is still needed for parking and emergency vehicle access; furthermore, most of the vehicles and equipment
being stored at the site are large construction vehicles and equipment, which required more storage area than a passenger car
or truck. Construction equipment and vehicles require more space to maneuver (i.e. larger turning radii, larger parking areas,
etc.). When being serviced these vehicles require large services bays, as well as additional areas with the lay down area for the
large equipment (lifts, hoists, cranes, etc.) needed to service the larger equipment. Therefore, the typical parking requirements
for an office building do not apply, and are considerably larger based on the type and number of pieces of equipment.
proposed additional impacts to the wetlands in the northern portion of the propertV, associated with roadways. However, the
layout was re -designed, in order to avoid impacts to the forested wetlands and buffers within the central portion of the
propertV.
3. Explain how the hardship results from physical nature of the property, such as its size, shape, or topography, which is different
from that of neighboring property.
As stated above, the southwestern portion of the propertV is narrow and constrained by an interstate to the south and wetlands
and stream channels to the north and west. A stream channel bi-sects the property in this location and cannot be avoided in
order to access the uplands on either side of the channel. Additional hardships include steep slopes, floodplain, and wetlands
abutting the project, which severely impact the amount of developable area. In order to provide access for emergency vehicles,
Local Fire Code requires a paved roadway around the buildings, which will allow fire apparatus vehicles within a minimum of
150 feet of anv portion of the buildine.
Offsite alternative sites were explored for this project; however, in order to provide adequate building space and parking for all
divisions, at least 21 acres of buildable land are needed, as well as an adjacent roadway infrastructure that supports heavy truck
use. The current location allows for future growth, provides better utilization of existing personnel and equipment, utilizes
parts/tools warehousing and non -duplication of housing parts, provides for better internal communication between divisions,
and provides protection of parked vehicles and equipment during flooding, which is now experienced at the current location of
the Public Works WSM Division, southwest of this site. In addition, the proposed layout provides more acceptable storage and
in-house work area conditions. and dedicated pedestrian walkways. which provides for a safer work environment for personnel.
while utilizing the existing utility and road infrastructure.
4. Explain whether the hardship was caused by the applicant knowingly or unknowingly violating the applicable Buffer Rule.
The applicant has not violated the buffer rules.
5. For Neuse, Tar -Pamlico, Jordan Lake and Goose Creek only: Did the applicant purchase the property after the effective date of
the applicable Buffer Rule and then request a variance?
No — the applicant purchased the property in January 1997, prior to the effective date of the Buffer Rules. However, a
portion of the project does extend into land purchased in 2016.
FORM: VAR 10-2013 Page 6 of 7

6. Explain how the hardship is rare or unique to the applicant's property, rather than the result of conditions that are widespread.
The subject property was purchased in January 1997, prior to the implementation of the buffer rules. There is an existing 20 -
acre facility that houses approximately 82 staff of the Administration, Plant Engineering & Maintenance, Regulatory Compliance,
and Utility Engineering divisions of the Department, along with associated vehicles, equipment, and inventory. The applicant
wishes to consolidate relocate multiple Divisions of the Department into one facility. After exploring offsite alternatives it was
determined that this site is uniquely suited to achieve this goal. The adjacent roadways will support heavy truck use and the
amount of useable land should allow for continued growth of the facility over the next 20 years.
F. Deed Restrictions
By your signature in Section G of this application, you certify that all structural stormwater BMPs required by this variance shall
be located in recorded drainage easements, that the easements will run with the land, that the easements cannot be changed
or deleted without concurrence from the State, and that the easements will be recorded prior to the sale of any lot.
G. Applicant's Certification
I, "vc —. ��� �Z4�i/ (print or type name of person listed in Section A, Item 2), certify that
the information included on this permit application form is correct, that the project will be constructed in conformance with the
approved plans and that the deed restrictions in accordance with Section F of this form will be recorded with all required permit
conditions.
Signature:
Date:
FORM: VAR 10-2013 Page 7 of 7

APPENDIX B
WETLAND DELINEATION INFORMATION

Water Resources
ENVIRONMENTAL QUALITY
July 19, 2017
City of Durham
Property and Facility Management
Attn; General Services Real Estate Division
101 City Hall Plaza
Durham, NC 27701
ROY COOPER
Governor
MICHAEL S. REGAN
Secretan-
S. JAY ZIMMERMAN
Director
Subject: Buffer Determination Letter
NBRRO #17-192
Durham County
Determination Type:
Buffer
Intermittent/Perennial
® Neuse (15A NCAC 2B .0233)
Start(q
❑ Tar -Pamlico (15A NCAC 26 .0259)
® Intermittent/Perennial Determination (where local buffer
USGS
To o
ordinances apply)
❑ Jordan 05A NCAC 213 .0267)
(governmental and/or interjurisdictional
Throughout Property
projects)
X
Project Name
Address/Location:
Stream(s):
Mist Lake Facility Expansion
2905 Meridian
Goose Creek and UTs
Durham, NC 27713
Determination Date: June 2$, 2017 Staff: Jason Robinson
Stream
E/IfP*
Not Subject
Subject
Start(q
StopcT
Soil
Survey
USGS
To o
A
P
X
Throughout Property
X
X
B
P
X
Throughout Property
X
X
D
P
X
Throughout Property
X
X
E
I
X
DWR Flag
36.022118
-78.861238
Stream A
X
H
i
X
DWR Flag
--36.020327
-78.859938
DWR Flag
--35,020639
-78.860345
X
Pond P
X
X
X
I
E
X
X
*EIVP = EphenierrjllInterniittentlPerennial
Division of Water Resources, [Zaleigh Regional Office. Water • Quality Operation., Section wq Llp•
I628 hlaiI Service Center. Raleigh, NC 27699-1628 Phone: [phone]
Location: 3800 Barrett Drivc, Ralcigh< NC 27609 Fax: [phone]

Mist Lake Facility Expansion
Durham County
July 19, 2017
Page 2 of 2
Explanation: The stream(s) listed above has been located on the most recent published NRCS Soil Survey of
Durham County, North Carolina and/or the most recent copy of the USGS Topographic map at a 1:24,600 scale.
Each stream that is checked "Not Subject" has been determined to not be at least intermittent or is not present.
Streams that are checked "Subject" have been located on the property and possess characteristics that qualify it to be
at least an intermittent stream. There may be other streams located on the property that do not show up on the maps
referenced above but may be considered jurisdictional according to the US Army Corps of Engineers.
This on-site determination shall expire five (5) years from the date of this letter. Landowners or affected
parties that dispute a determination made by the D'*VR may request a determination by the Director. An
appeal request must be made within sixty (60) days of date of this letter. A request for a determination by the
Director shall be referred to the Director in writing. If sending via CIS Pastal Service: c/o Karen Higgins;
DWR --- 401 & Buffer Permitting Unit, 1617 Mail Service Center; Raleigh, NC 27699-1617. If sending via
delivery service (UPS, FedEx, etc.): Karen Higgins; DWR — 401 & Buffer Permitting Unit; 512 N. Salisbury
Street; Raleigh, NC 17604.
This determination is final and binding unless, as detailed above, unless an appeal is requested within sixty
(60) days.
This project may require a Section 404/401 Permit for the proposed activity. Any inquiries should be
directed to the US Army Corp of Engineers (Raleigh Regulatory Field Office) at (919)-554-4884.
If you have questions regarding this determination, please feel free to contact Jason Robinson at [phone].
S' cer ly,
J 7ater
Danny SmitSupervisor,Quality Regional Operations Center
cc: RRO DWR File Copy
Kelly Roth, McAdams Company: 2945 Meridian Parkway, Durham, NC 27713

17-192 Mist Lake Facility Expansion
(Joins sheet i 8] 1
Legend:
-Approximate Site
boundary:
-Approximate Start/Stop
Map provided by NCQEo
Division of Water Re-
sources
Locations are approxi-
mate and are provided for
reference only !: A

P
w
17-192 Mist Lake Facility Expansion
srar�u Map provided by NCDEQ
Legend:`,°¢ Division of Water Re-
t �
05
-Approximate Site �;;, sources
Locations area proxi-
bounday.- yA�u, mate and are provided for
reference only

r w.
SUBJECT PROPERTY
rugA I _
END STREAM B
END STREAM A -
Q
\ \� WETLAND H
+/ 1.00 AC.
START ST
(NOT BUF
tr. 4y. 1 WETLAND D
END STREAM F
ETLAND F y t +/ 0.57 AC.
+/ 0.78 AC.
POND X
STREAM Y +/- 0.12 AC.
(NOT BUFFERED) / WETLAND C
+/ 0.19 AC.
i/ END STREAM E
STREAM G
(NOT BUFFERED)
�•� START STREAM E
WETLAND G
+/ 0.41 AC. I !✓f t"�/f a!s' ^76
j
I' WETLAND E
I +/- 7.62 AC. ✓.: 4
WETLAND B
+/ 0.38 AC.
POND P
+/- 2.87 AC.
WETLANI
+l- 0.27 P
I
TREAM Z END STREAM H
JOT BUFFERED) I I
` Pond is not subject to
' V START STREAM H d w Buffer Rules, as per
DWR site visit.
START STREAM B
kM D —
START STREAM A
LEGEND
STREAM
WETLAND
WATER BODY
50 -FT NEUSE RIPARIAN BUFFER
SUBJECT PROPERTY
PARCELS
Source: Es i, 4Q&alG'lobe, G ye, art star 2 -FT CONTOURS
Get appih.g, Aerogrid, IGN, IGF; swisstopo, a
!J0 125 250
STREAM, WETLAND, & BUFFER DELINEATION Feet
FIGURE 3. EXISTING CONDITIONS 1 inch = 250 feet
MIST LAKE FACILITY EXPANSION DATE: 7/6/2017
,�j qDH �DURHAM, NORTH CAROLINA JOB NO: DUR-16010
W ` ' M `+ � DRAWN BY: roth
X:\Protects\DUR\DUR-16010\Storm\Wetlands\Mist Lake Expansion\GIS\DUR16010 Fiqure 3 MistLake North 11x17 7-6-2017.mxd, 7/6/2017 12:10:55 PM, roth

APPENDIX C
PRELIMINARY STORMWATER AND UTILITY PLANS

1 12 13 14 15 16 17 18 19 110
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COPYRIGHT 2011 - RNL. This document, and the ideas and design concepts incorporated herein,
as an instrument of professional service, can not be used, in whole or in partfor this or any other
project, without the written authorization of RNL.
PROJECT No: 39722.001
DATE: 08/25/2017
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project, without the written authorization of RNL.
PROJECT No: 39722.001
DATE: 08/25/2017
SCALE: AS SHOWN
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APPENDIX D
ORIGINAL LAYOUT

APPENDIX E
COMPENSATORY MITIGATION DOCUMENTS

WILD LANDS AM
HOLDINGS
Neuse 01 Riparian Buffer Credits Statement of Availability
July 27, 2017
Mr. Todd Preuninger
Timmons Group
1001 Boulders parkway, Suite 300
Richmond, VA 23225
RE: Availability of Riparian Buffer Credits for the Mist Lake Facility Expansion project
Bank Name: North Fork Little River Nutrient Offset & Buffer Bank
Bank Sponsor: Wildlands Holdings, II, LLC
DWR Project Number: 2016-0130
Permittee: City of Durham — Department of Water Management
Riparian Buffer Credits Needed: 57,027 sq. ft.
Riparian Buffer Credits Available: 181,645 sq. ft.
Neuse 03020201 River Basin (Upper Falls Watershed)
Dear Todd:
Wildlands Holdings III, LLC currently has sufficient riparian Buffer credits from the North Fork Little River Nutrient Offset
& Buffer Bank to satisfy the riparian buffer mitigation requirements related to the above-mentioned project. The
project is located within the service area (HUC 03020201 Upper Falls Watershed) of the Bank.
This letter is simply a statement of availability of credits as of the date written. It is not a guarantee of availability as
credits will be sold on a first come, first serve basis. An invoice for this transaction will be sent upon your request and
we will formally reserve both the credits and price quoted for a period of 30 days from the invoice.
Final transfer of the credits will be made upon receipt of a copy of the 401 Water Quality Certification Authorization
Certificate from the NC Department of Environmental Quality approving the Riparian Buffer mitigation purchase from
the Bank and upon receipt of your payment to Wildlands Holding III, LLC. We will then issue a credit transfer certificate
verifying your credit purchase to the North Carolina Division of Water Resources and to you for your records
We appreciate the opportunity to assist you with your mitigation requirements. Please contact me at 704-719-2100 or
[e-mail] if you have any questions or need any additional information.
Sincerely,
Robert W. Bugg
NC & SC Realtor°, Broker, ALC
Director: Mitigation Development & Credit Sales
Wildlands Engineering, Inc.
[e-mail]
o) 704-332-7754 ex. 105
m) 704-719-2100
Wildlands Holding III, LLC • Wildlands Engineering, Inc • 312 West Millbrook Road, Suite 225, Raleigh, NC 27609

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