20071105 Ver 2_More Info Received_20080228

I Oversight/Express Review Permitting Unit
50 Mail Services Center
leigh, NC 27604
Request for Additional Information
WQ Project #07-1105, version 2 Johnston County)
ar Ms. Karoly:
28 FEB 08
1,53
hided with this cover letter are the required items for the request of addition Aq!, Ek6R.NC'0
ormation regarding the River Oaks Tract. On January 28 2008, the property owners
eived a letter requesting additional information to- supplement the Pre-construction
tification submitted on December 31St 2007. This letter and package include all other
ms and required documentation requested from the previous correspondence as
lined below:
Please re-submit your site plans on full plan sheets at a scale of no smaller than
1 "=50'. Response- The requested scale of 1"=50' was not feasible on full (24"
3615) plan sheets due to the size of the tracts. Site plans are however, resubmitted
on full plan sheets for each proposed tract of the property at a scale no smaller
than I"=100' (one tract fit on a V'= 50').
2. Please provide an inventory of proposed project imperviousness area based on
the estimated built-out conditions. Please include all proposed building
rootprints, roads, driveways, sidewalks,'gravel-surfaced areas, amenity areas,
etc. Response- Inventories of proposed project imperviousness areas were
compiled according to the Johnston County Stormwater Design Manual. There
.are currently no estimated built-out conditions for the site. Son-Lan Dev. is only
applying for the requested stream crossing to provide access to the tract and not
attempting to develop the individual tracts. Any proposed development will
require a submission of a Stormwater Management Statement. We conducted a
meeting with Jamie Guerrero (Johnston Co. Public Utilities) to clarify our
response. He stated that all future development plans, regardless of the developer
will meet all state and county stormwater standards as well as necessitating a
Perimeter Setbacks for the tract layouts per the proposed zoning designation. A
wetlands, streams, and buffers are noted on tract layouts and their associated are
are enumerated. Additionally the environmentally sensitive areas (wetlands,
streams, and buffers) will be included in an overall conservation easement or
perpetual deed restriction, prohibiting building within, to be recorded at time of
sale. To reduce encroachment, we are providing additional setbacks as "No Bui
Zones" along the environmentally sensitive areas.
4. Please indicate proposed lot layout as overlays on the site plan. Response- One
large overall map, as well as an individual tract layout for each of the nine
proposed tracts is provided with associated setbacks as denoted in response to
Item #3.
5. Please locate all isolated or-non-isolated wetlands, streams, and other waters of
the State, along with topographic contours, as overlays on the site plan.
Response- Topographic features and areas to be conserved/restricted (buffers an(
wetlands) are designated on each individual tract layout. Also on overall site
plan.
6. Please locate all of the protected riparian buffers as overlays on the site plan
clearly showing Zone] and Zone 2. Res once- All buffers are shown on the
overall and individual tract layouts. Zones 1 and 2 are clearly defined and areas
in buffer, streams, and wetlands are calculated on a per tract basis. Also noted on
the individual and overall tract maps, is the 100' buffer along Swift Creek per
Johnston County.
Please submit electronic CAD files showing proposed stream crossing, via email
to ian.mcmillan@,ncmail net and provide a CD along with your response to the
additional information requested. The CD is included in this packet and an email
has been sent to Mr. Ian McMillan containing the crossing CAD files associated
with the response.
lope this packet fulfills any informational gaps or discrepancies with the initial PCN
e stream crossing. Please contact us if any further information is required.
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Johnston County
'tormwater
)esign Manual
igust 1998
:vised October 2000
:vised November 2004
gvised May 2005
Bvised March 2006
Wised January, 2008
?hnston County Dept. of Utilities
0. Box 2263
nithfield, NC 27577
?9-8333
i General Procedures
N construction and development within the planning jurisdiction of Johnston County are
yect to many ordinances and policies of the County. The Johnston County Planning
)artment can provide complete information on all applicable County ordinances and policies.
;.01 Stormwater Management Plan Permit Application
approved Stormwater Management Plan is required for all new development. The
rmwater Management Ordinance defines new development as:
activity that disturbs more than one acre of land or creates more than 17,000
are feet of impervious surfaces for a single family or duplex residential
elopment, recreational facility, or multifamily, institutional, commercial or
istrial development
tormwater Management Plan Permit Application shall be submitted on behalf of the
ier or developer of the site where new development is proposed. The owner or
eloper must sign the application and provide the required contact and development
rmation on the application. An application form is included in Appendix B.
The completed and signed application form.
The review fee for the Stormwater Management Plan Permit Application. See
fiction 1.5.02 for more information. All checks should be made payable to
,hnston County.
The parcel number or North Carolina PIN should be provided for the tract where
s development is proposed.
Impervious area calculations in accordance with Section 2 of this manual.
Total Nitrogen Export calculations in accordance with Section 4 of this manual.
tevised 1/08
A vicinity map, showing the location of the development within the County. The
ale of this map must be adequate to show multiple cross streets.
An overall map showing the current zoning and land use of all surrounding
)perty, both up and downstream, which could be directly impacted by the
)posed stormwater management system.
One complete set of development plans, signed and sealed by the professional
aineer or land surveyor.
Jne set of site specific Stormwater Management Plans and details, signed and
sled by the design professional. The following information should be included
he Stormwater Management plans as applicable:
)etailed existing topographic information for the entire site. A minimum
?-foot contours is required. Where existing slopes exceed 12%, a
jimum of 10-foot contours will be accepted.
e: The County prefers topographic information to extend 50'
,ond the site property lines, where it can be provided.
'roposed road profiles with existing and proposed elevations. Profiles
uld include storm sewer piping where proposed. Storm sewer
Files, with existing and proposed ground elevations, should be
tided where storm sewer is not located within the road profile.
'he Vertical Datum utilized.
'he 100-year flood plain boundaries and elevations from the most recent
M.
A jurisdictional wetland boundaries on site.
I water features, as found on the USGS Quadrangles and the Johnston
my Soil Survey. The plans must also show the required Riparian
ers surrounding each feature. See section 1.5.04 for additional
-mation on Riparian Buffers.
II proposed stormwater management facilities.
II existing stormwater management facilities should be shown. Existing
:tures should be labeled with inverts, size, material and ground
ations.
Mails of all stormwater management facilities. Specific design
!nsions should be indicated as appropriate.
3inage easements, as discussed in Section 6 of this manual.
construction sequence, to specifically discuss the proposed installation
g of all stormwater management facilities proposed.
,,ised 1/08
. Design calculations and details for, all proposed Best Management Practices
VIP's). All BMP's must meet the design guidelines listed in Chapter 5 of this
mual. If other guidelines are utilized, the calculations should document the
urce utilized and confirm that the source contains design guidelines acceptable
Johnston County Public Utilities.
Written Inspection and Maintenance agreements, to be recorded, for all
Irmwater management facilities proposed as a BMP. Additional maintenance
reements may be required for other stormwater management facilities.
A copy of the approval letter from the NC Department of Environment and
tural Resources, Land Quality Section for the site sedimentation and erosion
itrol plan.
Where applicable, a revised Stormwater Management Statement. Statements
3 required for preliminary plat approval, if the proposed development is
,dified after the Statement is submitted, a revised Statement should be
luded with the Stormwater Management Plan application.
)ction 2 Impervious Area Limitations
I Requirements
new development shall be held to the following impervious area limits:
ale 2.1 Impervious Area Limits
pe of Development
pervious Area Limitation
>ide the ESOD Outside the ESOD
n4.1.. 7 1 ?---
U??? L. 1 1111JIVI VIuu5 /Area LIM ITS

T
f D Impervious Area Limitation
ype o
evelopment Inside the ESOD Outside the ESOD
Single Family Residential 12% 15%
Other Development-
Commercial, Industrial,
Institutional and Multi-family 50% 60%
gle Family Residential includes all subdivisions where. no more than one dwelling unit is
posed per lot. The development must be subdivided with single-family homes proposed.
;reation areas and open space associated with a single-family subdivision is also included in
total development maximum impervious area allowed.
er Development includes all commercial, industrial, institutional and multi-familv