SW8890902_HISTORICAL FILE_19891026

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 %cgoq oz
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
® HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
Ic1<:�q kU2.0
YYYYMMDD

STATE OF NORTII CAROLINA
Department of Environment, Health and Natural Resources
Wilmington Regional Office
James G. Martin, Governor
William W. Cobey, Jr., Secretary
DIVISION OF ENVIRONMENTAL MANAGEMENT
SEPTEMBER 28, 1989
Mr. John F. Davis
P.O. Box 642
Fayetteville, North Carolina 28302
Subject: Bay Tree Apartments
Stormwater Project
No. 890902
Onslow County
Dear Mr. Davis:
Rob Lnnicson
Regional Manager
Per our conversation September 28, 1989 concerning Lhe
Directors Certification of Bay Tree Apartments project. The
following is a summary of the items mentioned in our
conversation.
1. The use of the onsite concrete pipe is an effect way to
route the water off the site but lacks the treatment
needed for the protection of the receiving stream.
2. The total impervious surfaces at the site are far above
the allowable 300.
3. Due to the location and nature of this project it is the
opinion of this office at this time that you should
explore the low density option or an Engineered system as
indicated in the current Stormwater regulations .
As discussed there are several areas in the project that may
be reduced or removed to more closely adhere to the current
regulations. An example of such areas is the access road for the
dumpster sites. Removal of this area will reduce the impervious
surfaces by approximatily 5208 sq.ft..
7?15\;/r y;h D.viI I, /Avrnur,WiInlinlaim, N,(..)11.11) 1'1,. V,•'I r I rI'h, f. 'h.11'.1
An liqual Opportunity Nlinnlivc Aclinn Pninlriv—

Mr. Davis
September 28, 1989
Page -2-
Attached is an additional information form for the review
for either the Low Density approach or a Engineered system.
If you have any further questions feel free to call me at (919)
256-4161.
Si r jy;
Sul E. Rawls
Environmental Technician V
PER:BAYTREE.SEP
cc: WiRO,, CF

DIVISION OF ENVIRONMENTAL MANAGEMENT
U
lL7�1►I��iuT.1//��ld
Subject: Pr 'ect No.
County
Dear Sir:
The Wilmington Regional Office received a copy of the plans for
on
At this time your submittal concerning Stormwater Management is not complete.
The following information is needed to complete your submittal.
For projects using density limits approach.
_IZA site plan that clearly indicates all built -upon areas
(i.e., streets, driveways, walkways, building footprints,
etc.).
Computations showing the percent built upon areas, both
existing and planned.
_.�A copy of deed restriction(s) and restrictive covenants
which include the State as a beneficiary.
_zThe attached submittal form should be completed for
�roJects using the density limits approach.
Other
t/For projects involving an engineered Stormwater Management
System:
Plan and profile drawings of the collection and/or
disposal systems.
imputations or other criteria used to support design of the
system.
/ Volume of runoff.
1✓/Volume of containment/disposal system.
;/ Dewatering time of containment/disposal system.
�Z Length of vegetative filter strip needed.
=XOther

Supporting data concerning the hydrogeology of the s:i.te:
Seasonal high water table.
/ / /Infiltration capacity - saturated hydraulic conductivity.
Other.
Drainage pattern(s) for design storm event, and drainage
pattern(s) for runoff in excess of design storm event.
A complete stormwater maintenance manual including responsible
party, quantitative and qualitative criteria which would
indicate when corrective maintenance is required, and a
periodic maintenance table as needed.
'Other
proposed monitoring program for the system.
J Other
This information should be received by this office no later than
,; tion or your project will be returned as incomplete.
Please be reminded that construction of the subject project may not
commence prior to af9Poval oe Stormwater Management Plan. We will make
every attempt to %s" } u� an way we can. If youhave any questions,
lease call Uff �/ at telephone number (919)
256-4161
Qcia
,1T onald Safrit
Regional Water Quality Supervisor
DS:trw
cc: Bill Mills
WiRO, CF

Send Form To:
Washington Reoion
Water Quality Supervisor
Div. of Envir. Mgmt.
1505 North Market Street
Washington, N.C. 27009
[phone]
For the Following Counties:
Beaufort, Bertie, Camden, Chowan,
Craven, Currituck, Dare, Gates
Hertford, Hyde, Pamlico, Pasquotank,
Perquimmans, Tyrrell, Washington
Wilmington Reo ion
Water Quality Supervisor
Division of Envir. Mgmt.
7225 Wrightsville Ave.
Wilmington, N.C. 28403
[phone]
For the Following Counties
Carteret, Brunswick, New Hanover
Hanover, Qnslow, Pender

JOHN F. DAVIS & ASSOCIATES
P.O. Box 042
120 GILLESPIE ST.
PA1'ETTE.VILLE, N.C. 28302
Storm Drainage Study
Proposed Bay Tree Apartments
Richlands, North Carolina
Onslow County
I. Area of Interest:
TELEPHONE
919-484-0976
919-484-1077
R D W I E
SEP 1 8 1989
rRoi # X iQ-M-2
The area of interest encompasses an area of approximately
19 acres, bounded by Franck Street on the North, Onslow Street
to the East and Sylvester Street to the South. This area is
composed of single family residences ( 57%+-), apartment complex
( 30% +-), undeveloped areas ( wooded,OB%+_).and impermeable
surfaces ( 05.% +-).
Topography is gently sloping ( 2%+-) and soils profile consist
of a mixture of Leon fine sand and Norfolk loamy fine sand
according to USDA - SCS soil maps. The main point of
interest is the existing 24' diameter rcp road.culvert under
Sylvester Street which is the main discharge point for this
study area. This point is important since it will also
serve as the main discharge point for the proposed Bay Tree
Apartments Complex.
II. The method employed in analizing the area of interest was
the Rational.Method. The Rational Method is a classic
approach to storm water drainage which is defined as:
Q=CIA
where Q= runoff
C= coefficient of runoff, dimensionless
I= intensity of storm event, with a duration equal to
time of concentration, tc of a particular design
storm 1h/hr
A= drainage area, acres
and by convention 1 CFS = 1 Ac - in/hr
The following assumptions where made based on the available
information:
1. Minimum pipeslopewas used in determining pipe
capcity and flow time where plans were not available.
2. A weighted coefficent of runoff, Cc was used based
on the assumed percentage of tributary area..
3. Median values of individual coefficient of runoff,
Cc were used in determining Cc.
4. All pipes are flowing full. The design data used
was the 10 year design storm and the Wilmington,area
rainfall duration/intensity chart in determining
the peak runoff values. Pipe flow and over land flow
was used in determining the time of concentration,tc.
III. Existing Drainage:
The Northern most contributary section bordered by Franck

JOHN F. DAVIS & ASSOCIATES
P.O. BOX 642
120 GILLESPIE ST.
FAME"17EVILLF, N.C. 28302
'TELEPHONE
919-484-0976
919-484-1077
Street, Onslow Street and Cooper Street is drained by a
fairly uniform open ditch channel which discharges this
flow to an existing catch basin at the corner of Cooper
and•Onslow Streets. This catch basin also picks up a
majority of the flow from the existing storm drainage system
of the Trade Winds Apartment Complex. The flow from this area
is conveyedfromthis catch basin by a 24' diameter RCP
Pipe system under Cooper Street, running parallel with Onslow
Street until it reaches Mill Street. The contributary
section of Cooper Street, Onslow Street, and Mills Street is
drained primarily by a relatively uniform open ditch
channel discharging through an 18" diameter RCP to the 24"
diameter RCP system.
At the intersection of Mills Street and Onslow Street the
24" daimeter Rcp reduces to 18" diameter Rcp crossing Mills
Street. This reduction in size should not cause a construction
problem even though it is not a conventional design approach.
The discharge at the receiving end of the 18" Rcp is
approximately 20.56 CFS. At the existing slope this pipe
is capable of passing approximately,25 CFS at full pipe flow
thus localized flooding should not be a problem.
This 18" RCP pipe discharges directly into an uniform open
channel which conveys the runoff to the point of interest.
The flow from the ditch to the receiving end of the 24" RCP
is approximately 34 CFS. The existing slope and size of
pipe is only capable of passing approximately 12 CFS of
runoff. This does .not appear to be problem since
topographic considerations allow for some ponding without
undo damage to street or adjacent area.
IV. Developmental Impact Assesment
The impact at the point of interest should be favorable
with the development of the Bay Tree Apartment Complex,because
of little increase in the runoff flow. The runoff increased
to 35 CFS after development. This small increase in
magnitude is contricuted to the following factors:
1. The time of concentration increased from 18.4+- mins
to 20+- mins, thus decreasing the rainfall intensity,I.
2. The composite coefficient of runoff increased from 0.4+-
to 0.45+-.
Thus the increase in Cc and to appears to have offset any
localized increase in Cc directly associated with the Site

JOHN F. DAVIS & ASSOCIATES
P.O. BOX 642
120 GILLISPIE ST.
FAYETTEVILLE, N.C. 28302
TELEPHONE
919-484-0976
919-484-1077
development. Further, the open throat yard inlet should act
as a temporary holding structure once the existing road culvert
has reached it's cepcity. This inlet is capable of holding an
efficient amount of runoff hydrulically without causing serious
flooding to the surrounding area. The increase in runoff and
the distance to the closest recieving water course should not
cause a significant impact down stream from the culvert.
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%oC�\
RUNOFF,EROSION AND SEDIMENT
CONTROL PLAN
BAY TREE APARTMENTS
RICHLANDS,ONSLOW COUNTY
NORTH CAROLINA
Property OF; Baytree Associates
P.O. Box 768,Fayetteville,N.C.
28302 919-424-1243
Plan Prepared By: John F. Davis
P.O. Box 642,Fayetteville, N.C.
28302 919 484-0976 `
t, ,

JOHN F. DAVIS & ASSOCIATES
P.O. BOX 642 TELEPHONE
120 GILLESPIE ST. 919-484-0976
PAYETTEVILLF, N.C. 2H3112 Page One 919-484-1077
RUNOFF , EROSION AND SEDIMENT CONTROL PLAN.
BAY TREE APARTMENTS.
RICHLANOS,ONSLOW COUNTY,NORTH CAROLINA.
SCOPE OF PROJECT.
Bay.Tree Apartments is a twenty four unit multi -family apartment
complex for the elderly located ❑n the East side of Richlands at
the intersection of Dnslow Street with Mills and Sylvester Streets.
The twenty four units are located in five building with one
community building. Total land area is 3.433 acres of land.
Soil conditions according to the USDA-SCS maps indicate a
mixture of Leon fine sand and Norfolk Loamy fine sand . The Site
is covered with small and large undergrowth with a drainage ditch
flowing from the Northeast corner Southwestward to a twenty four
inch culvert under Sylvester Street. This ditch will be .piped and
relocated through the building site, all on site storm water will
be collected in catch basins and piped into the relocated storm
sewer. All Catch basins shall be utilized as on site temporary
sediment basins and maintained as such.during the construction
period.
Sanitary sewer and water mains shall be extended into the proposed
building site from Sylvester and Dnslow Streets as per the attached
plan. After construction..is complete these utilities will be main-
tained by the Town of Richlands.
During the construction period approximately three ( 3.0) acres
of area will be disturbed . The construction entrances into the
site shall be off Sylvester and Mills Street.and shall be protected
with a thirty by fifty foot mud pad of six inch ballast stone at
each entrance. Construction time for the above project will be
approximately eight months.

JOHN F. DAVIS & ASSOCIATES
P.O. Box 642
120 GILLESPIE ST.
PAYE' TI VILLE, N.C. 28302
BAY TREE APARTMENTS
Page Two
RICHLANDS.ONSLOW COUNTY.N.C.
CONSTRUCTION STAGING.
TELEPHONE
919-484-0976
919-484-1077
1. Clearing and grubbing of all building locations, utility and
and drainage easements, driveways and parking lots. At this
time all silt fences shown on the plan shall be installed.'
2. Rough grading ,:.cut..andifill of all building padsr;;, drives
etc and the installation of the relocated storm sewer and
accompanying storm sewers and catch basins. All catch basins
shall be converted into temporary sediment basins at this
time and the mud pads at the construction entrances laid.
3. Installation of sanitary sewer and water mains, underground
power and telephone lines and the constructions of all buildings.
4. Final grading, curb and gutterinstallation, paving of all drives
and parking lots and the necessary seeding of All exposed areas
as per the the NOrth Carolina Sediment and Control ordiances.
See the attached plan for seeding information.
Desion Criteria
All storm sewer structures and pipe sizes for this project have
been designed based on the runoff from a ten year storm and accepted
engineering practices. Computations are by the Rational formula
based on a concentration time of five minutes. See the attached
plan for area computations, pipe sizes, fence construction,etc.
All seeding shall be done as per the attached information and
recommendations of the North Carolina Soil Conservation Service.

JOHN F. DAVIS & ASSOCIATES
11.0. BOX 642 TELEPHONE
120 GIL.LESPIE ST. 919-484-0976
FAYETTEVILLE, N.C. 28302 919-484-1077
Page three
BAY TREE APARTMENTS.
INSPECTION OF EROSION AND SEDIMENT CONTROL MEASURES.
The Grading and utility contractors shall be responsible
for the proper construction and periodic inspection,:of all
control measures specified by the Sediment and Erosion control
plan.In addition to the above , if additional control measures
are deemed necessary by the inspecting authorities and upon
their recommendations such measures shall be implemented at
once. All construction areas. shall be inspected after'each''
heavy rainfall and/or on a weekly basis. '
See page four for additional construction specifications
for rip -rap aprons.