SW7061202_CURRENT PERMIT_20070227

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE�Z���
YYYYMMDD

via:Fzo
Michael F. Easley, Governor
i William G. Ross Jr., Secretary
rNorth Carolina Department of Environment and Natural Resources
.� Alan W. Klimek, P.E. Director
Division of Water Quality
DIVISION OF WATER QUALITY
February 27, 2007
New Bern Building Supply, Inc. n ��
Attn: Mr. J.V. Williams /" G
PO Box 12305
New Bern, NC 28561 1(� 5c,
Subject: Stormwater Permit No. SW7061202
New Bern Building Supply Warehouse
High Density Stormwater Project
Craven County
Dear Mr. Williams:
The Washington Regional Office received a stormwater
application and supporting information for the subject project on
December 11, 2006. It has been determined that this project will
comply with the Stormwater Regulations set forth in Title 15A NCAC
2H.1000. We are forwarding Permit SW7061202 dated February 27,
2007 to New Bern Building Supply for the construction and
operation of a wet detention pond to serve New Bern Building
Supply located adjacent to Neuse Blvd. in New Bern, NC.
This permit shall be effective from the date of issuance
until February 27, 2017, and shall be subject to the conditions
and limitations as specified therein. Please pay special attention
to the Operation and Maintenance requirements in this permit.
Failure to establish an adequate system for operation and
maintenance of the stormwater management system will result in
future compliance problems.
If any parts, requirements, or limitations contained in this
permit are unacceptable, you have the right to request an
adjudicatory hearing upon written request within thirty (30) days
following receipt of this permit. This request must be in the
form of a written petition, conforming to Chapter 150B of the
North Carolina General Statutes, and filed with the Office of
Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-
7447. Unless such demands are made this permit shall be final and
binding.
North Carolina Division of Water Quality Internet: h2o.enrstate.ncus
943 Washington Square Mall Phone: [phone]
Washington, NC 27889 FAX [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled110% Post Consumer Paper
NorthCarolina
JVaturally

New Bern Building Supply, Inc.
February 27, 2007
Page Two
If you have any questions, or need additional information
concerning this matter, please contact Bill Moore at (252) 948-
3919.
S' ncerelyy,�,
LL
Al Hodge, Regional Supervisor
Surface Water Protection Section
Washington Regional Office
cc: Avolis Engineering
City of New Bern Planning/Inspections
Washington Regional Office
Central Files

State Stormwater Management Systems
Permit No. SW7061202
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143,
General Statutes of North Carolina as amended, and other
applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
New Bern Building Supply
Craven County
FOR THE
construction, operation and maintenance of stormwater management
systems in compliance with the provisions of 15A NCAC 2H.1000
(hereafter referred to as the "stormwater rules") and the approved
stormwater management plans and specifications and other
supporting data as attached and on file with and approved by the
Division of Water Quality and considered a part of this permit for
grass swales, vegetated buffers and a wet detehticn pond to serve
the New Bern Building Supply Warehouse project located adjacent to
Neuse Blvd. in New Bern, NC.
This permit shall be effective from the date of issuance until
February 27, 2017, and shall be subject to the following specified
conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and
volume of stormwater described in the application and other
supporting data.
2. This stormwater system has been approved for the management
of stormwater runoff as described on page 4 of this permit,
the Project Data Sheet.
3. Approved plans and specifications for this project are
incorporated by reference and are enforceable parts of the
permit.
3

DIVISION OF WATER QUALITY
PROJECT DATA
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Receiving Stream:
Stream Classification
Total Site Area:
Total Impervious:
Area Allowed
Pond Depth:
Required Storage Volume
Provided Storage Volume
Required Surface Area:
Provided Surface Area:
Controlling Orifice:
New Bern Building Supply
SW7061202
Craven County
New Bern Building Supply
PO Box 12305
New Bern, NC 28561
12/11/2006
UT-Neuse River
SC -NSW
7.01 acres
3.45 acres
4.0 ft
15,893 cf
15,893 cf
12,971 sf
13,257 sf
drawndown orifice 2.0-inch.at
elevation 94.5 ft.
n

4. No homeowner/lot owner/developer shall be allowed to fill in,
alter, or pipe any vegetative practices (such as swales)
shown on the approved plans as part of the stormwater
management system without submitting a revision to the permit
and receiving approval from the Division.
5. The following items will require a modification to the
permit:
a. Any revision to the approved plans, regardless of size
b. Project name change
C. Transfer of ownership
d. Redesign or addition to the approved amount of built -
upon area
e. Further.subdivision of the project area.
In addition, the Director may determine that other revisions
to the project should require a modification to the permit.
6. The Director may notify the permittee when the permitted site
does not meet one or more of the minimum requirements of the
permit. Within the time frame specified in the notice, the
permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements.
The permittee shall provide copies of revised plans and
certification in writing to the Director that the changes
have been made.
II. SCHEDULE OF COMPLIANCE
1. The permittee will comply with the following schedule for
construction and maintenance of the stormwater management
system.
a. The stormwater management system shall be constructed
in its entirety, vegetated and operational for its
intended use prior to the construction of any built -
upon surfaces except roads.
b. During construction, erosion shall be kept to a minimum
and any eroded areas of the system will be repaired
immediately.
2. The facilities must be properly maintained and operated at
all times. the approved Operation and Maintenance.Plan must
be followed in its entirety and maintenance must occur at the
scheduled intervals.
3. The permittee shall at all times provide the operation and
maintenance necessary to assure the permitted stormwater
c �,ctom fi nrt ipnc at nntlmum eff1.ciency including, but not
J
limited to:
5

a. Semiannual scheduled inspections (every 6 months)
b. Sediment removal
C. Mowing and revegetation of side slopes
d. Immediate repair of eroded areas
e. Maintenance ofside slopes in accordance with approved
plans and specifications
f. Debris removal and unclogging of outlet structure,
orifice device and catch basins and piping.
4. Records of maintenance activities must be kept and made
available upon request to authorized personnel of DWQ. The
records will indicate the date, activity, name of person
performing the work and what actions were taken.
5. This permit shall become voidable unless the facilities are
constructed in accordance with the conditions of this permit,
the approved plans and specifications, and other supporting
data.
6. Upon completion of construction and prior to operation of
this permitted facility, a certification must be received
from an appropriate designer for the system installed
certifying that the permitted facility has been installed in
accordance with this' permit, the approved plans and
specifications, and other supporting documentation. Mail the
Certification to the Washington Regional Office, 943
Washington Square Mall, Washington, North Carolina, 27889,
attention Division of Water Quality.
7. A copy of the approved plans and specifications shall be
maintained on file by the Permittee for a minimum of five
years from the date of the completion of construction.
III. GENERAL CONDITIONS
1. This permit is not transferable. In the event there is a
desire for the facilities to change ownership, or there is a
name change of the Permittee, a formal permit request must be
submitted to the Division of Water Quality accompanied by an
application fee, documentation from the parties involved, and
other supporting materials as may be appropriate. The
approval of this request will be considered on its merits and
may or may not be approved.
2. Failure to abide by the conditions and limitations contained
in this permit may subject the Permittee to enforcement
action by the Division of Water Quality, in accordance with
North Carolina General Statute 143-215.6(a) to 143-215.6(c).
3. The issuance of this permit does not preclude the Permittee
from complying with any and all statutes, rules, regulations,
or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
6

4. In the event that the facilities fail to perform
satisfactorily, including the creation of nuisance
conditions,- the Permittee shall take immediate corrective
action, including those as may required by this Division,
such as the construction of additional or replacement
stormwater management systems..
5. The permit may be modified, revoked and reissued or
terminated for cause. The filing of a request for a permit
modification, revocation and reissuance or termination does
not stay any permit condition.
6. At least six months prior to the expiration date, the
permittee must submit a written request for permit renewal
to the Division of Water Quality, Washington Regional
Office.
Permit issued this the 27 th day of February, 2007.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.E. Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW7061202.
7

Stormwater Permit No. SW7061202
New Bern Building Supply
Swales, Vegetated Buffers, and Wet Pond
Craven County
Designer's Certification
I, , as a duly
registered Professional Engineer in the State of North Carolina,
having been authorized to observe (periodically/weekly/full time)
the construction of the project,
for
(Project)
(Project Owner)
hereby state that to the best of my abilities, due care and
diligence was used in the observation of the project construction
such that the construction was observed to be built within
substantial compliance and intent of the approved plans and
specifications.
Signature
Registration Number
Date

rrdricgrgwNffFin1 "iS
OFFICE USE ONLY t
Date Received Fee Paid Permit Number
DEC 1 6
DWp V ARO State of North Carolina S wA � K k�/ �/� t
` Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
New Bern Building Supply, Inc.
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
J.V. Williams, President
3. Mailing Address for person listed in item 2 above:
P.O. Box 12305
New Bern
Telephone Number:
252 ) 638-5861
Me
28561
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
New Bern Building Supply Warehouse Addition
5. Location of Project (street address):
3301 Neuse Boulevard
City: New Bern County: Craven
6. Directions to project (from nearest major intersection):
400 feet southeast of the intersection of Racetrack Road and Neuse Boulevard
(NC 43) on the south side of Neuse Boulevard.
7. Latitude: N 35°-7.7771' Longitude: W 770-5.552' ofproject
8. Contact person who can answer questions about the project:
Name:Joseph C. Avolis P.E. Telephone Number: ( 252 ) 633-0068
II. PERMIT INFORMATION:'r
1. Specify whether project is (check one): X New Renewal Modification
,r
Form SWU-101 Version 3.99 Pagel of4

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number N/A and its issue date (if known) N/A
3. Specify the type of project (check one):
_Low Density X High Density _Redevelop __General Permit Other
4. Additional Project Requirements (check applicable blanks):
_CAMA Major X Sedimentation/Erosion Control _404/401 Permit _NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
III. PROJECT INFORMATION
In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project .
This project is 100% a redevelopment project. Stormwater will be collected in
a ination of grass swales and catch basins/piping and then discharged into
a wet detention pond.
2. Stormwater runoff from this project drains to the
3. Total Project Area: 7.01 acres
5. How many drainage areas does the project have?.
Neuse
River basin.
4. Project Built Upon Area: 49.33
6. Complete the following information for each drainage area. If there are more than two 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 2
Receiving Stream Name
UT to Neuse River
Receiving Stream Class
SC; Sw, NSW
Drainage Area
305,201 SF
Existing Impervious Area
298877 SF (To be Demcli
hed)
Proposed Impervious'Area
150 564 SF
% Impervious Area (total)
49.33%
Impervious* Surface Area
Drainage Area 1
Drainage Area 2
On -site Buildings
28 850 SF
On -site Streets
0 SF
On -site Parking-,124
714 SF
On -site Sidewalks
0 SF
Other on -site
0 SF
Off -site
0 SF
Total: 150,564 SF
Total:
impervious area is detmed as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
FormSWU-lot Version3.99 Page 2of4

7. How was the off -site impervious area listed above(
Site visit and topographic survey.
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdiv±lions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table
listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment.
I. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number
as issued by the Division of Water Quality. These covenants may not be
changed or deleted without the consent of the State.
2. No more than _150 r 564 square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt, gravel, concrete, brick. stone. slate or similar material but do not include wood
decking or the tvater surface of swimming pools.
3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity
and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, 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 State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and a% ailabih!y or these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
Form SWU-101 Version 3.99 Page 3 of 4

fr '
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ),
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Original and one copy of the Stonnwater Management Permit Application Form
One copy of the applicable Supplement Form(s) for each BMP
Permit application processing fee of $420 (payable to NCDENR)
Detailed narrative description of stormwater treatment/management
Two copies of plans and specifications, including:
-Development/Project name
- Engineer and firm
- Legend
- North arrow
- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm): Avolis Engineering, P.A.
Mailing Address: P.O. Box 15564
City: New Bern State: NC
Zip: 28561
Phone: ( 252 1 633-0068 Fax: ( 252 i 633-6507
VIII. APPLICANT'S CERTIFICATION
I. (print or type name of person listed in General Information, item 2) J.V. Williams Jr
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 15A
NCAC 2H .1000.
Signatu
Form SWU-101 Version 3.99 Page 4 of
Date: November 10, 2006

Permit No.
(to be provided br D111Q)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWO Stortwater Management Plan Review
A complete stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
I. PROJECT INFORMATION
Project Name: New Bern Building Supply Warehouse Addition
Contact Person: Joseph C. Avolis, P.E. Phone Number. (252 ) 633-0068
For projects with multiple basins. specify which basin this v+orksheet applies to:
elevations
Basin Bottom Elevation
Permanent Pool Elevation
Temporary Pool Elevation
areas
90.5 ft
94.5 ft. /
95.61 ft. ✓
a
(floor of the basin)
(eleaticm Of the orifice)
(elevation of the discharge sn,ucture over/loll
Permanent Pool Surface Area 13,257 sq. ft.. (ivate)-sufoce area at the orifice elevation)
Drainage .Area 7.01 ac. (on -site and off -sire drainage to the basin)
Impervious Area 3.46 ac. (on -she and off -site drainage to the basin)
volumes
Permanent Pool Volume 27,802 cu. ft. (combined volume of main basin and forebov)
Temporary Pool Volume 15, 893 cu. ft. (volume detained above the permanent pooh
Forebay Volume 5,200 cu. ft. (approximately 20% of total volume)
Other parameters
SA/DA
Diameter of Orifice
Design Rainfall
Design TSS Removal '-
4.25
2 in.
1 in.
(surface area to drainage area ratio fn-onz DhVO table)
(2 to 5 day tempormy pool draw -down required)
90 % (mininnnn 85% )-equired)
Form SWU-102 Rev 3.99 Nee I of 4

Footnotes:
When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
actual impervious % and permanent pool depth. Lincar interpolation should be employed to determine the correct value for non-
standard table entries.
-' In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90%TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal.
11. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section_ 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an anent in the StormWater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The forebay volume is approximately equal to 20% of the basin volume.
The temporary pool controls runoff from the design stomi event.
The temporary pool draws down in 2 to 5 days.
If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flog
calculations)
The basin length to width ratio is greater than 3:1.
The basin side slopes above the permanent pool are no steeper than 3:1.
A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
Vegetative cover above the permanent pool elevation is specified.
A trash rack or similar device is provided for both the overflow and orifice.
A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
I. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
m. A mechanism is specified which will drain the basin for maintenance or an emergency.
III. R'ET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
This system (check one) OOM Rdoes not incorporate a vegetated filter at the outlet.
This system (creek one) el does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum heieht of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain
proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wet detention basin or stream, etc.).
The measurinia device used to determine the sediment elevation shall be such that it will Live an accurate
depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 3
\\ hen the permanent pool depth reads 3
Sediment Rc oeal El. 91 .5
Bottom Ele eon 90.5
FOREBAY
feet in the main pond, the sediment shall be removed.
feet in the forebay. the sediment shall be removed.
BASIN DIAGRAM
(fill in the blaekv)
Permanent Pool Elevation 94. 5
Sediment Removal Elevation 91 . 5 1 759 o
Bottom Elevation 90.5 V 75%
MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Form SWU-102 Rev 3.99 Pare 3 of

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible parry.
Print name: J.V. Williams, Jr.
Title: President
Address: P.O. Box 12305, New Bern, NC 28561
Note: The legally responsible pany should not be a homeo�cncrs association unless more than i0% of the lots have been sold and a
resident of the subdivision has been named the president.
Beth Simmons
a Notary Public for the State of North Carolina
County of Craven do hereby certify that J.V. Williams, Jr.
personally appeared before me this 10th day of November 2006 ,and ackno t'ledE!c the due
execution of the forgoing "et detention basin maintenance requirements. \Vitness my hand and official seal.
NOTARY l' r
PUBLIC `� -► 1��-%�
SEAL
\4y commission expires April 22, 2009
Form S%VU-102 Rev 3.99 Pane 4 of 4

STORMWATER MANAGEMENT NARRATIVE
New Bern Building Supply Warehouse Addition
3301 Neuse Boulevard
New Bern, North Carolina
This project is primarily a redevelopment project. 5.74 acres of the project was formerly the
long time Unicon concrete block manufacturing plant site. Over the years, virtually the entire
site has been covered with impervious surfaces consisting primarily of concrete with some
gravel. Recently, the adjacent New Bern Building Supply purchased the site and now intends to
construct a building supply storage facility. The large areas of existing concrete on the site are
going to be demolished with the concrete being crushed and recycled.
In addition to the warehouse, future development on the site is possible but no plans are solid
yet. Therefore, impervious surface allowances are accommodated in the new stormwater design
and include a future vehicle maintenance garage (4,800 SF Building & 10,000 SF Parking) and a
cabinet shop (3,600 SF Building & 3,600 SF Parking).
The project also includes improvements to and expansion of the main front parking area to the
building supply facility.
Part of the former Unicon Block Plant site lies within the railroad right-of-way behind the new
warehouse and stormwater detention pond. This area will remain as it presently exists and is
outside of the project stormwater drainage watershead.
Due to the large area of concrete demolition on the site, the final project built -upon area will be
less than it is today. There are presently no stormwater controls or treatment on the site. The
new project will provide stormwater treatment for a large area which is presently receiving none.
The final peak runoff rate for the site will be less than the existing conditions.
The project proposes the use of a wet detention pond with a four foot permanent pool depth. The
pond is sized for 90% TSS and will not incorporate a vegetated filter strip. A planted forebay
and perimeter shelf are specified. Stormwater is directed to the detention pond via a
combination of grassed swales and piping.