SW8941015_Historical File_19941118 (2)

State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor DIVISION OF ENVIRONMENTAL MANAGEMENT Bob Jamieson
Jonathan B. Howes, Secretary WATER QUALITY SECTION Regional Manager
November 18, 1994
Mr. Mark B. Pearsall
PVC, Incorporated
Post Office Box 7246
Rocky Mount, North Carolina 27804
Subject: CERTIFICATION OF COMPLIANCE
with Stormwater Regulations
Stormwater Project No. SW8 941015
Holiday Inn Wrightsville Beach
New Hanover County
Dear Mr. Pearsall:
This Certification is pursuant to the application for the Holiday Inn Wrightsville Beach received
on October 26, 1993, with additional information received November 16, 1994. Staff review of the
project plans and specifications has determined that the stormwater control system as proposed will
comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1003(h). Stormwater runoff
will be treated by an infiltration basin sized to contain the first inch of runoff from 137,983 square feet
of buildings, parking and sidewalks located on the site.
Any modification of the plans submitted to and approved by this Office or further- development
of this site regardless of the fact that such modification may be less than 1 acre, will require an additional
Stormwater Submittal/Modification and approval prior to initiation of construction. Modifications include
but are not limited to; project name changes, transfer of ownership, redesign of built -upon surfaces,
addition of built -upon surfaces, redesign or further subdivision of the project area as shown on the plans
submitted to and approved by this Office.
This Certification shall be effective from the date of issuance until rescinded. The project shall
be constructed and maintained in accordance with the plans and specifications approved by the
Wilmington Regional Office. This Certification does not supersede any other permit or approval. The
developer is responsible for obtaining any and all permits and approvals necessary for the development
of this project. This could include the Division of Coastal Management under CAMA requirements, The
Division of Environmental Management undrPr Wetland 401 Water Quality Certification, and/or a Dredge
and Fill Permit, and/or a Sewer Extension/Collection Permit, U.S. Army Corps of Engineers 404
Wetland Permit, NPDES Stormwater Permit if disturbing five acres or more, local County or Town
Agency permits under their local ordinances, or others that may be required.
127 Cardinal Drive Extension, Wilmington, N.C. 29405-3945 a Telephone [phone] O Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Pearsall
November 18, 1994
Stormwater Project No. SW8 941015
----------------------------------------------
A professional engineer must certify that the stormwater system has been installed in accordance
with the approved plans and specifications upon completion of construction. The attached certification
should be received by this Office within 30 days of construction completion.
The infiltration structure shall be constructed in it's entirety, permanently vegetated (if applicable),
and operational prior to the construction of any impervious surfaces proposed for the project, except
roads.
If you have any questions concerning this matter, please call Ms. Linda Lewis or me at (910)-
395-3900.
Sincerely,
Dave Adkins
Water Quality Supervisor
DA/arl: S:\WQS\STORMWAT\CERTMC\941015.NOV
cc: George Cameron
Sky, Conklin New Hanover County Building Inspections
Beth Easley, New Hanover County
John Parker, CAMA
Bradley Bennett
Linda Lewis
Wilmington Regional Office
Central files

DIVISION OF ENVIRONMENTAL MANAGEm EENT
IN LTRATION SYSTEM PROTECT DATA
Project Name:
Project No.:
Location:
Applicant Name:
Mailing Address:
Submittal Date:
Water Body Receiving Stormwater Runoff.
Classification of Water Body:
Basin size:
Basin Depth:
Bottom Elevation:
Design Storage Elevation:
Total Impervious Surfaces Allowed:
Green Areas Draining to Basin:
Storage volume required:
Storage volume provided:
Infiltration Rate and Type of Soil:
Holiday Inn Wrightsville Beach
SW8 941015
New Hanover
Mr. Mark B. Pearsall
PVC, Incorporated
Post Office Box 7246
Rocky Mount, North Carolina 27804
October 26, 1993
ICWW
"SA"
1107 linear feet of 8'w x 3.5'h trench
3.5'
3.0 MSL
6.55 MSL
137,983 square feet
6,922 square feet
11,128 cubic feet
12,923 cubic feet
.52 in/hr, Newhan Sand
Comments:
Site infiltration rate will be much higher that .52 in/hr. The trench volume provided does not
include the side triangles, so the actual capacity is 19,909 cubic feet. Like systems on the island function
very well. The trench drains at the entrances to the site act as the overflow weirs. Almost 1.8" of runoff
will be handled in the. system prier to any overflow.

WMTRATION SYSTEM EVALUATION
1. Yee No System is capable of treating and disposing of runoff from all impervious
surfaces resulting from 1-1/2 inches of rain.
2. Yes No The system is located at least 30 feet from surface waters.
3. Yes No The system is a minimum of 100 feet from water supply wells.
4. Yes No The bottom of the system is a minimum of 2 feet above the seasonal high
water table.
5. Yes No Runoff in excess of the design volume by-passes the system and does not flush
pollutants through the system.
6. Yes No The vegetative filter provides non -erosive flow for the 10 year storm, even
distribution of the runoff over the length of the filter, a slope of 5 % or less,
and is planted with natural, grassed, or artificially planted wetland vegetation.
7. Yes No The system has been shown to completely draw down in 5 days.
8. Yes No Soil has a minimum hydraulic conductivity of 0.52 in/hr.
9. Yes No The system is not sited on or in fill material.
10. Yes No The system has an observation well.
11. Yes No An Operation and maintenance plan has been provided for the system.
12. Yes No THIS PROJECT MEETS THE STORMWATER CONTROL
REQUIRIMENTS OF 15 NCAC 2H. (g), (h), 0), (k) and (1). For YES,
items 1-14 must all be highlighted YES.
DIVISION OF ENVIRONMENTAL MANAGEMENT SIGN -OFF
Wilmington Regional Office
18 LOV 24 ' chi, &
Date In idual Evaluating Form/Plans
Date Regional Soil Scientist
l g R%2�t� c� �iA
Date Regional Water Quality Supervisor
cc:Applicant/Bradley Bennett/arl/WiRO/CF

Holiday Inn Wrightsville Beach
New Hanover County
Stormwater Project No. SW8 941015
Engineer's Certification
L , 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 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. Recorded deed restrictions are attached to provide further evidence that the project has
been built within substantial intent of the approved stormwater plans and spectifications.
Signature
Registration Number
Date

IMPORTANT
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WHILE YOU WERE 0
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PLEASE CALL
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Message_ HOL I DAY I M J
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N.C. Dept. of Environment, Health, and Natural Resources
�v v� Printed on Recycled Paper

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IMPACT
ENGINEERING, P.C.
3805 Wrightsville Avenue, Unit 17 - Wilmington, North Carolina 28403 - 910-350-0631
November 10, 1994
State of North Carolina
Department of Environment, Health and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405-3845
Attention: Ms. Linda Lewis
Subject: Holiday Inn at Wrightsville Beach
Stormwater Project No. SW8 941015
New Hanover County
Void Ratio of No. 57 Stone
Reference: (1) Letter from Ms. Linda Lewis, DEHNR, to Jim
Honeycutt, Impact Engineering, dated November 3, 1994
Dear Ms. Lewis,
I talked to a Mr. Rich Moses of Martin Marietta Corporation in
Wilmington about the void ratio of No. 57 stone. He said I
should use 0.40. The stone from Martin Marietta's local Castle
Hayne facility has a void ratio of 0.45, so the 0.40 would be
conservative.
(Jr A -A F`.Pe
w [ no col? neGh011 '
5 { ze,4 t jslaen no
.ham It
(f l
Sincerely,
George Cameron
910-256-5915 (home)
910-617-5735 (mobile)

oa STATE o
State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor DIVISION OF ENVIRONMENTAL MANAGEMENT Bob Jamieson
Jonathan B. Howes, Secretary WATER QUALITY SECTION Regional Manager
November 3, 1994
Mr. Jim Honeycutt, P.E.
Impact Engineering
3805 Wrightsville Avenue, Unit 17
Wilmington, North Carolina 28403
Subject: ADDITIONAL INFORMATION
Stormwater Project No. SW8 941015
Holiday Inn Wrightsville Beach
New Hanover County
Dear Mr. Honeycutt:
The Wilmington Regional Office received a Stormwater Submittal for the Holiday Inn Wrightsville
Beach on October 26, 1994. A preliminary review of that information has determined that the submittal
for the subject project is not complete. The following information is needed to continue the stormwater
review:
Label catch basin and trench piping inverts.
2. Where is the connection/overflow control weir structure from the infiltration system into
the street piped system? The ability to bypass the excess runoff is required by regulation.
Please locate on plans and provide a detail.
3. A signed and notarized Operation and Maintenance Plan for the stormwater controls
(currently under development)
4. The assumed void ratio of .4 after compaction must be documented. Please forward a copy
of the specification sheet for the chosen #57 stone which indicates the void ratio to be
expected after 95 % compaction.
127 Cardinal Drive Extension, Wilmington, N.C. 28405-3845 • Telephone [phone] Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Honeycutt
November 3, 1994
Stormwater Project No. SW8 941015
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to December 3, 1994, or the submittal will
be returned as incomplete.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
DA/arl: S:1WQSISTORMWATIADDINFO1941015.NOV
cc: George Cameron
(2) Linda Lewis
Central Files
2

Project # 941015 Date 03—Nov-94
Project Name HOLIDAY INN Reviewer ARL
Drainage Basin ICWW Classification SC
Site Area
179081 Square Feet
4.11 Acres
Impervious Area Calculation
Buildings
Parking/Asphalt
Concrete
Other
Volume/Storage Calculation
Required
Drainage Area 179081 Square Feet
4.11 Acres
36454
X
1.00 =
36454 square feet
86534
X
0.95 =
82207 square feet
14995
X
0.90 =
13496 square feet
0
X
0.00 =
0 square feet
Total
132157 sauare feet
Required Volume To Store
Pipe Diameter
Length Of Pipe
Length Of Trench
Width Of Trench
Height Of Trench
Cross —Sectional Area Of Trench
Storage In Piping
Provided
Available Volume To Store
(Assuming 40% Voids)
Elevation Of Bottom Of Trench (LOWEST)
Elevation Of Seasonal High Water Table
Exfiltration Rate / Drawdown
Miminum Required Exfiltration rate
Reported Hydraulic Conductivity (In/Hr)
Bottom Surface Area
Provided Exfiltration Rate
Comments:
11013 Cubic Feet
1.00 Feet
1107.00 Feet
1107.00 Feet
8.00 Feet
3.50 Feet
28.00 Square Feet
3 Cubic Feet
12923 Cubic Feet
3.00 Mean Sea Level
1.00 Mean Sea Level
805.5 Gallon Per Hour
0.52 Inches per Hour
8856.00 Square Feet
2870.5 Gallon Per Hour Per Sauare Foot
SJe- is ver Sri o P-ob Qbl� in Pl fr•af2, MLCA �'►,5�e�- g►
r-Q+e. TAP)cA vof CCllr. ' e sloes naf Iorskide
�i
Ac4u0( C12CI' 1•5 C�
0909 Cr / wkl (� ; t 39% Cr wye
o4her- y4om5 in '� z �r'eo TUnchon Vefy G)ell.

Drainage calculations for Holiday Inn, Wrightsville Beach, NC
Project IE-4100
9124/94
A := 179081 e A = 4.111 •sue
runoff:- 1•in
...total area of site
...volume of runoff to be stored
VsR := runoff•A VsR = 14923 •ft3 ...volume of storage required based on 1" of runoff
W :- 8-ft ft ...trench width
H := 4-ft ft ...trench depth
d := 1-ft ft ...pipe diameter
v := 0.4 ...assumed void ratio of stone
_ d2
Apipe ' �2 ...cross-sedonal area of pipe
L := VsR L = 1124 °Ift ...length of trend required
L A pipe + \W -R - A pile . v,
Analysis of drawdown time:
K := O.52•in K = 1.204.10 `
hr fe
time := VsR time = 38.3 •br
K•L•W
p ECEIV(
D
OCT 3 1 IM
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swg a4.1015_
Sw
'* a SEAL ��
9524
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Vz-f-11

Attachment
To
Evaluation of Stormwater Infilration System
Holiday Inn at Wrightsville Beach
Item 4: Seasonal High Water Table
The seasonal high water table at the Holiday Inn site at Town of
Wrightsville Beach can not be readily determined.
The seasonal high water table is normally determined by a change
in the color of the soil caused as the water table fluctuates
leaching the soil. In order for the leaching to occur, the soil
must be in place long enough to accumulate leachates and be a
suitable size to hold the leachates. The soil at Wrightsville
Beach is sand .and has not been in place .long enough to .
accumulate leachates. The Holiday Inn is on the site of a
Moores Inlet, 'which closed in the 19501s. Per Dr.James Doakal,
a professor in the Geology Department at the University of North
Carolina at Wilmington, forty years is not long enough for the
leachate accumulation. Furthermore, per Vince Lewis, a soil
scienctist at the DEHNR, who inspected the sand, the grains are
too large to hold the leachates, and, therefore, no
discoloration would develop.
Sufficient absorbing soil was determined by other means.
1. Two holes were dug on the site - one by North Lumina Ave,
which is the lower part of the site (approximately El. 7'-011),
and one at end of the site towards the ocean, which is the
higher part of: the site (approximately El. 9'-0"). The holes
were dug with a posthole digger and were 4'-6" deep. Water was
not observed in either hole then or during an inspection three
days later. Per the calculations for the drain field and the
dimensions of the system, 4'-6" of sand is to absorb the water
from the field.
2. Other drain fields close to the site at approximately the
same elevation and in the 'same soil conditions were inspected
and found to be more than adequate. The Cordgrass condominiums
across the street and north two blocks have an infiltration
system designed per the Town of Wrightsville Beach and was
observed in the rain to be operating satisfactorily. In some
cases, the water was being absorbed so well by the sand at the
bottom of the catch basins that the water was not rising enough
to flow into the horizontal drain field lines.
The Town of Wrightsville Beach Inspection Department said the
systems installed per the town specification operated well and
no problems have been observed.

Items 6, 7, 8 & 9: Vegatative Filter
A vegetative filter is used to filter
infiltration system does not process.
for the Holiday Inn is being designed
and not have any excess. Therefore,
not required.
excess water that the
The infiltration system
to process all the water
the vegetative filter is