SW5200702_Stormwater Narrative_20200723

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Snow Hill Road Pump Station — Phase 2 NNE E.
1. Existing Conditions
The SHRPS is currently owned and operated by Durham County, and located at 2525 Snow Hill Road,
Durham, NC 27712, a parcel owned by the State of North Carolina (Durham Technical Community
College (DTCC), North Campus). Existing easements at the south end of the parcel consist of Duke
Power and City of Durham's easement for the existing pump station. Additionally, a 5.79-acre easement
at the south end of the parcel is being acquired from DTCC to house a new pump station on the parcel.
The parcel currently contains administrative buildings, parking lots, a gravel power easement access road,
and the existing Snow Hill Road Pump Station, all existing as of the baseline date of March 2001.
According to Durham County GIS, the DTCC campus has a piped stormwater network that Therefore, all
impervious on site is considered existing for this analysis.
2. Proposed Work
The existing pump station at 2525 Snow Hill Road is currently undersized for future development in the
region and must be replaced with a larger capacity pump station, with additional facilities for odor control
and electrical housing. Additionally, the existing pump station and most of the length of the access road
are situated in the mapped 100-year flood zone (future condition). Therefore, the proposed pump station
will be in a different location, outside of the floodplain, and in an area currently wooded.
The proposed activities for this project include the following:
• Construction of new Pump Station and accessory facilities outside of the floodplain
• Construction of driveway access off Snow Hill Road, and access loop around facility
• Demolition of the existing pump station and gravel parking area
A total of approximately three acres of land will be disturbed with this project. In addition to area
disturbed for the construction of the proposed facilities, land disturbance for this project includes
g LCHIPUld.ly 121yuUWII/JLUcxtJllc WCU dIIu UISLuiuwiuc lcqullcu LU cUIIIIccL LU ulc uXISLlIIg PUIIIP JLULluu III LIIc
Mfloodplain. Refer to Contract Drawings for extent of the limits of disturbance, including erosion control
M measures to protect downstream properties during construction.
o
New impervious on site includes the new pump station, electrical generator, odor control, and chemical
tank. Additionally, to allow for truck access to this facility, a 24' wide loop drive is proposed for around
the new pump station. New impervious by category is listed in Appendix C, Land Use Tables. It is
Hazen and Sawyer • 4011 WestChase Boulevard, Suite 500 • Raleigh, NC 27607 • 919.833.7152

Hazen
June 3, 2020
important to note that the proposed work at the SHRPS site adds as little impervious area as practical, to
not affect the natural drainage patterns of the site.
2.1 Stormwater Requirements
The project is located within the Falls Lake Lower Basin Overlay (F/J-B). According to the Table in
8.7.213 of Durham's Unified Development Ordinance (UDO), the low -density option impervious surface
limit for F/J-B watersheds is 24%. The existing parcel is 16% impervious, and the proposed work
increases this area to 19% impervious, falling into the low -density option for the watershed.
The site will maintain low -density development through the construction of vegetated swales for
stormwater capture throughout the site. Considering the site's location in the Water Supply Watershed
(F/J-B), the following requirements are identified for this parcel:
k Discharge Requirements
Mitigatlu o o�?���*�� �'=eVor the 2 and 10 yea desi st rms
�k�w andue�nteaPto
Mitigation o peacs or ir, water ie r e year storm
Durham Development Services Center (DSC)
S Requirements for review and approval.
T,Co rpyhnv{rl R50/ rp(hictirm of %CC inr irll ",91V iM0,9!-VioJ1S SZl3'faCeS
Water Quality Requirements (not reviewed by DSC)
1. Mitigation of nutrient exports to Falls Lake standards
2.1.1 Nutrient Calculations
The SNAP Tool Version 4.1 was used to determine the nutrient treatment required for the SHRPS. It is
important to note the existing development on site as of the Falls Lake baseline of March 9, 2001: several
DTCC buildings and parking lots and an access road. These areas were removed from the SNAP Tool
inputs to produce the nutrient loading requirements. The proposed project adds approximately 33,300 sf
of new impervious and 1,500 sf of new open-air tanks to the parcel.
Nutrient calculations have been included in Appendix C; results are summarized below:
Table 3: Nutrient Loading
Pre-
development
Post-
development
Falls Lake
Limits
Nitrogen Loading (Ib/ac/yr)
0.73
1.16
2.2
Phosphorus Loading (Ib/ac/yr)
0.16
0.24
0.33
Since the site falls below the Falls Lake limits, SCMs are not required to meet water quality standards.
Stormwater Narrative Page 2 of 2
Snow Hill Road Pump Station — Phase 2

Hazen
Appendix A:
Stormwater Management Permit Application
(one original, one copy)
June 3, 2020
Stormwater Narrative
Snow Hill Road Pump Station — Phase 2

DEMLR USE ONLY
Date Received
Fee Paid
Permit Number
Applicable Rules: ❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph II - Post Construction
(select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan
❑ Other WQ M t Plan:
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral and Land Resources
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Road Pumn Station
2. Location of Project (street address):
Snow Hill Road
City:Durham County:Durham Zip:27712
3. Directions to project (from nearest major intersection):
Head east three miles from the intersection of Snow Hill Rd and U.S. 501. Past the main entrance to Durham
Technical Comrngniy College on the left side of the road ored e Rd and the additional entrance to DTCC
A utW road leads to the existing urn station and the construction entrance to the proposed pump station.
4. Latitude:36° 05' 44" N Longitude:78° 51' 59" W of the main entrance to the project.
II. PERMIT INFORMATION:
1. a. Specify whether project is (check one): ®New ❑Modification ❑ Renewal w/ Modificationt
tReneioals with modifications also requires SWU 102 - Renewal Application Forth
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number , its issue date (if known.) , and the status of
construction: ❑Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification
2. Specify the type of project (check one):
®Low Density ❑High Density ❑Drains to an Offsite Stormwater System ❑Other
3. If this application is being submitted as the result of a previously returned application or a letter from
DEMLR requesting a state stormwater management permit application, list the stormwater project number,
if assigned, and the previous name of the project, if different than currently
proposed,
4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑CAMA Major ®Sedimentation/Erosion Control: 3.0 ac of Disturbed Area
❑NPDES Industrial Stormwater Z404/401 Permit: Proposed Impacts 0.13 acres
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:Erosion Control and 404 Permits are underway. Durham City/County
Planning reviewed water uanti requirements, and defers to the state for nutrient requirements since the
5. Is the project located within 5 miles of a public airport? ®No ❑Yes
If yes, see S.L. 2012-200, Part VI: http://l2ortal.ncdenr.org/web/lr/rules-and-regulations
Form SWU-101 Version Oct. 31, 2013 Page 1 of 6

III. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the project):
Applicant/Organization: Durham County
Signing Official & Title:Vincent Chirichella, PE, Durham County Engineering and Environmental Services
b. Contact information for person listed in item 1a above:
Street Address:5926 Highway`55 East
City:Durham State:NC Zip:27713
Mailing Address (if applicable):as above
City: -
Phone: [phone]
EmaiI:vchirichella@dconc. gov
State:- Zip
Fax: [phone]
Please check the appropriate box. The applicant listed above is:
❑ The property owner (Skip to Contact Information, item 3a)
❑ Lessee* (Attach a copy of the Iease agreement and complete Contact Information, item 2a and 2b below)
❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
® DeveIoper* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/Organization: Easement Owner City of Durham
Signing Official & Title:Don Greeley PE C4 of Durham Water Management
b. Contact information for person listed in item 2a above:
Street Address:1600 Mist Lake Drive
City:Durham
State:NC
Zip:27704
Mailing Address (If applicable):101 City Hall Plaza
City:Durham
Phone: (919 ) 560-4381
Email:[e-mail]
State:NC Zip:27701
Fax: (919 ) 560-4479
3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact Person/Organization: Corinne Wilson, PE / Hazen and Sawyer
Signing Official & Title:Corinne Wilson PE - Site QyLEngineer
b. Contact information for person listed in item 3a above:
Mailing Address:4011 WestChase Blvd, Suite 500
City:Raleigh State:NC Zip:27607
Phone: (919 ) 863-9257 Fax:
Email:[e-mail]
4. Local jurisdiction for building permits: Durham Development Services Center
Point of Contact:N/A - no building permit yet Phone #: 919 ) 5604137
Form SWU-101 Version Oct. 31, 2013 Page 2 of 6

IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
Stormwater runoff will sheet flow off of the pavement into roadside ditches that generally drain to the south
of the proposed site. No stormwater piping other than driveway culverts are proposed, to meet low densi
standards.
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
❑ Approval of a Site Specific Development Plan or PUD Approval Date:
❑ Valid Building Permit Issued Date:
❑ Other: Date:
b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
❑ Coastal SW -1995 ❑ Ph II - Post Construction
3. Stormwater runoff from this project drains to the Neuse River basin.
4. Total Property Area: 26.1
acres 5. Total Coastal Wetlands Area: 0 acres
6. Total Surface Water Area: 0 acres
7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project
Area+:26.1 acres
+ Total project area shall be calculated to exclude the followin : the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the Normal HiggIT Water (NRW line or Mean High Water
(MHM line, and coastal wetlands landward from the NHW (or MHVIj line. The resultant project area is used to
calculate overall percent built upon area (BUA). Non -Coastal wetlands landward of the NHW (or MHM line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 19
9. How many drainage areas does the project have? 1 (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
Basin Information
Drainage Area 1
Drainage Area _
Drainage Area _
Drainage Area _
Receiving Stream Name
Cabin Branch
Stream CIass *
WS-IV
Stream Index Number *
27-2-21-7
Total Drainage Area (sf)
1,136,000
On -site Drainage Area (so
1,136,000
Off -site Drainage Area (so
0
Proposed Impervious Area** so
28,812
% Impervious Area** total
19
Impervious' Surface Area
Drainage Area 1
Drainage Area _
Drainage Area _
Drainage Area _
On -site Buildings/Lots (sf)
2,830
On -site Streets (sf)
On -site Parking (sf)
25,982
On -site Sidewalks (so
Other on -site (sf)
Future (sf)
Off -site (sf)
Existing BUA*** (sf)
185,920
Total (so:
214,732
* Stream Class and Index Number can be determined at: http.A- ortaLncdenr.org aebfzvq[ps/cS1i/classT cations
*" Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
*** Report only that amount of existing B LIA that will remain after development. Do not report any existing B UA that
is to be removed and which will be replaced by new B UA.
Form SWU-101 Version Oct. 31, 2013 Page 3 of 6

11. How was the off -site impervious area listed above determined? Provide documentation.
N/A - water quantity calculations submitted to Durham DSC.
Proiects in Union County: Contact DEMLR Central Office staff to check if the project is located within a Threatened &
Endangered Species watershed that maybe subject to more stringent stormwater requirements as per 15A NCAC 02B .0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
from hM2://portal.ncderLr.org/web/wq/ws/su/bmp-manual.
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and
Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application
instruction sheet and BMP checklists are available from
http:/ /portal.ncdem.org/web/wq/ws/su/statesw/forms_docs. The complete application package should be
submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the
interactive online map at http://portal.ncdenr.org/web/wq/ws/su/maps.)
Please indicate that the following required information have been provided by initialing in the space provided
for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions
for each submitted application package from hqp://tiportal.ncdenr_or /web/wq/ws/su/statesw/forms docs.
Initials
1. Original and one copy of the Stormwater Management Permit Application Form.
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants
Form. (if required as per Part VII below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to
http://www.envhelp.org/pages/onestopexpress.html for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor
the project. This is required in addition to the brief summary provided in the Project
Information, item 1.
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the
receiving stream drains to class SA waters within 1/2 mile of the site boundary, include the 1/2
mile radius on the map.
7. Sealed, signed and dated calculations (one copy).
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
I. Details of roads, drainage features, collection systems, and stormwater control measures.
M. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations.
o. Drainage areas delineated (included in the main set of plans, not as a separate document).
CW
N/A
N/A - no SCMs
CW
CW
CW
CW
CW
Form SWU-101 Version Oct. 31, 2013 Page 4 of 6

p. Vegetated buffers (where required). N/A
9. Copy of any applicable soils report with the associated SHWT elevations (Please identify
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"x11" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DEMLR to venfij the SHWT prior
to submittal, [phone].)
10, A copy of the most current property deed. Deed book: Page No: To be included once obtained
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC N/A
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item la, 2a, and/or 3a per 15A NCAC 2H.1003(e).
The corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
http://www.secretary.state.ne.us/Cori2orations/CSearch.aWx
VIL DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from http://portal.ncdenr.org/web/Ir/state-stormwatex-
forms docs. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, that the covenants will be binding on all parties and persons claiming
under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the NC DEMLR, and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer: Corinne Wilson PE
Consulting Firm: Hazen and Sa er
Mailing Address:4011 WestChase Blvd, Suite 500
City:Raleigh
Phone: (919 ) 863-9257
Email: [e-mail]
State:NC
Zip:27607
Fax: (n/ a
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out complete this
section)
1, (print or type name of person listed in Contact Information, item 2a) Cihl of Durham (Don Greeley) , certify that I
own the property identified in this permit application, and thus give permission to (print or�hjpe name of person
listed in Contact Information, item 1a) Vincent Chirichella with (print or hjpe name of organization Iisted in
Contact Information, item 1a) Durham County to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.
Form SWU-101 Version Oct. 31, 2013 Page 5 of 6

As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back
to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and
submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater
treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility
without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement
action including the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
Signature: Date: G ?Z 2d
I, �[3P`�iQ a Notary Public for the State of �Aor.� 1ina , County of
l�u+1ri do hereby certify that personally appeared
d
before me this a2may of ::�'J Ante 4D - and acknowledge the due execution of the application for
a stormwater permit. Witness my hand and official seal,
jEE
140TA
Ady
CC%1 lft0'V axpAEs
AUBLIC v
X. APPLICANT'S CERTIFICATION
SEAL
My commission expires cr-- � ,er as �10
I, (print or type name of person listed in Contact Information, item 1a) Vincent Chirichella
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of the
applicable stormwater rules under 15A NCAC 2H .1000 and any other applicable state stormwater requirements.
Signature: Date:
I, , a Notary Public for the State of County of
do hereby certify that
before me this _ day of
personally appeared
and acknowledge the due execution of the application for
a stormwater permit. Witness my hand and official seal,
SEAL
My commission expires
Form SWU-101 Version Oct. 31, 2013 Page 6 of 6

Hazen
Appendix B : USGS Map
June 3, 2020
Stormwater Narrative
Snow Hill Road Pump Station — Phase 2

U.S. DEPARTMENT 01 THE INTERIOR NORTHEAST DURHAM QUADRANGLE
U.S. GEOLOGICAL SURVEY HURT CAROLINA
MUSGS 0.,; Rlo—p'o 7.5 MINUTE SERIES
ICAU�= ROAD- I- - - S­ M-1-11-.1
ImrxiaIm
................
;
. . .................
NORTHEAST DURHAM, NC
F1 2ol9

Hazen
Appen di x C : Storm -water Calculations
Exhibit 1: Pre -Development Land Use Map
Exhibit 2: Post -Development Land Use Map
Exhibit 3: Land Use Table
Exhibit 4: SNAP Tool
June 3, 2020
Stormwater Narrative
Snow Hill Road Pump Station — Phase 2

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Hazen Exhibit 3
Prepared by Hazen and Sawyer
Corinne Wilson, PE
Date of Calculation 4/10/2020
Client City of Durham
Project Name Snow Hill Road Pump Station - Phase 2
Description Land Use Table
Existing (pre
2001)
This Project
Proposed
CN (sf)
(sf)
(sf)
Parcel / Drainage Area*
-
1,136,001
Impervious
nvofs
98 185,920
41,600
28,812
2,830
214,732
44,430
Drive/Sidewalk
144,320
25,982
170,302
Total Impervious %
16%
3%
19%
Grassed
74 258,712
68,006
326,718
Wooded
70 691,369
-98,339
593,030
Open Air Tanks
- 0
1,521
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