TRIANGLE PLAZA AT LELY RESORT

P:\Land 2015\117. Stock Development\11715-01 Triangle Plaza Hobby Lobby SDPA\03 Design and Permitting\SDPA\REV 01\Engineer's Report.docx

TRIANGLE PLAZA AT LELY RESORT

ENGINEERING REPORT FOR: SITE DEVELOPMENT PLAN AMENDMENT

1ST SUBMITTAL: DECEMBER 2015 2ND SUBMITTAL: FEBRUARY 2016

PREPARED FOR:

SD TRACT 4 L.L.C 2647 Professional Circle, Suite 1201

Naples, FL 34119

PREPARED BY:

9351 CORKSCREW ROAD STE.102 ESTERO, FLORIDA 33928

CHRISTOPHER R. MITCHELL, P.E. FLORIDA LICENSE NO. 56740


TABLE OF CONTENTS

1 GENERAL PROJECT INFORMATION...................................................................................4

1.1 Site Location and Existing Conditions .......................................................................4

1.2 Project overview .....................................................................................................4

1.3 Project Access .........................................................................................................4

1.4 Surface Water Management Overview ....................................................................4

1.5 Utilities Overview ....................................................................................................4

2 STORMDRAIN ANALYSIS .................................................................................................4

2.1 Methodology ..........................................................................................................4 2.1.1 Rainfall Intensity – Duration – Frequency Curve for Zone 8 .................................. 5

2.2 STORMCAD CALCULATION AND RESULT: .............................................................7 2.2.1 Catchment Table: ...................................................................................................... 10 2.2.2 Catch Basin Table ....................................................................................................... 10 2.2.3 Conduit Table ............................................................................................................ 10 2.2.4 Outfall Table .............................................................................................................. 11

3 WATER HYDRAULIC ANALYSIS ....................................................................................... 11

3.1 Introduction .......................................................................................................... 11

3.2 System Performance ............................................................................................. 11

3.3 Demand calculation ............................................................................................... 12 3.3.1 WaterCAD: Potable water Layout ............................................................................. 13

3.4 Fire Flow Analysis .................................................................................................. 16 3.4.1 WaterCAD: Fire Layout .............................................................................................. 19 3.4.1.1 Fire Flow Table & Check Assembly Graph ................................................................ 19

3.5 Chloramine Dissipation ......................................................................................... 24 3.5.1 Chloramine dissipation Layout: ................................................................................. 24 3.5.2 Chloramine dissipation table: .................................................................................... 25

4 SEWER HYRAULIC ANALYSIS .......................................................................................... 26

4.1 System Performance ............................................................................................. 26

4.2 Sewer Calculations ................................................................................................ 26 4.2.1 Estimated average daily flow summary: ................................................................... 26 4.2.2 Gravity Sewer Pipe Capacity ...................................................................................... 27

5 ENGINEER’S OPINION OF PROBABLE COST.......................................................................... 28

6 APPENDICES ..................................................................................................................... 30

6.1 Site Location Map ....................................................................................................... 30 6.2 “Ten State Standards”…………………………………………………………………………………………………28


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1 GENERAL PROJECT INFORMATION

1.1 SITE LOCATION AND EXISTING CONDITIONS

Triangle Plaza at Lely Resort is 7.15 acre facility located in Collier County, Florida, within Section 33/34, Township 50 South, Range 26 East, and is situated north of Tamiami Trail East (U.S. 41), west of Triangle Boulevard. The zoning designation of the site is “PUD”. The existing developed site includes a parking lot, Steakhouse and Bank.

1.2 PROJECT OVERVIEW

The proposed project includes construction of building, removal of pavement, modification of watermain, firemain and drainage system.

1.3 PROJECT ACCESS

Access will be from Triangle Boulevard.

1.4 SURFACE WATER MANAGEMENT OVERVIEW

The existing surface water management system is permitted under SFWMD ERP Permit No 11-00429-S, Application No 130225-6. The system consists of a dry detention system to provide the required water quality treatment prior to discharge. Storm sewers, swales and overland flow convey run-off to the storage area. The property owners association is responsible for maintaining the surface water management system.

1.5 UTILITIES OVERVIEW

Potable water and sanitary sewer service is provided by Collier County, both of which are currently available onsite.

2 STORMDRAIN ANALYSIS

2.1 METHODOLOGY

The Manning’s formula was utilized to calculate the losses in the system and the runoff is calculated by using the rational method. Rainfall Intensity-Duration-Frequency Curves for Zone 8 from the October 2000 FDOT Drainage manual was used to obtain rainfall intensity (3.30 inches/hour). For all internal stormdrain lines, contributing flows to each catch basin was determined and calculations were performed for each run. The following StormCAD results show the catch basin number, catchment area, diameter of the conduit, length of the conduit, and the hydraulic grade line elevation at each catch basin. The hydraulic grade line elevation at each catch basin was kept below the flow line of each catch basin.


2.1.1 Rainfall Intensity – Duration – Frequency Curve for Zone 8


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2.2 STORMCAD CALCULATION AND RESULT:


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2.2.1 Catchment Table:

2.2.2 Catch Basin Table

2.2.3 Conduit Table


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2.2.4 Outfall Table

3 WATER HYDRAULIC ANALYSIS

3.1 INTRODUCTION

Potable water for the Triangle Plaza at Lely Resort is provided by 4” watermain and 8” firemain that branches from Triangle Boulevard. The water system is designed to accommodate the maximum daily flow for Hobby Lobby, existing Outback steakhouse and the future commercial building. Potable water will be provided by the Collier County Utilities Department. A separate 8” fire main exists that will provide the required fire flows for the development.

3.2 SYSTEM PERFORMANCE

The water mains have been sized to provide sufficient potable service to the existing Steakhouse and proposed Hobby Lobby Building. Since the existing Outback Steakhouse and proposed Hobby Lobby building are served by single meter, fixture units of both building were used to calculate the meter size. Based on the water meter sizing chart provided by the Collier County Utilities Department, the existing meter size of 2” will remain adequate under the proposed conditions. Water Meter Sizing Chart is provided in the submittal Package.


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3.3 DEMAND CALCULATION

The estimated flow demand is calculated based on the number of employees for proposed Hobby Lobby and number of seats for Steakhouse (restaurant). Flow rates are based on FDEP 64E-6.008 Table l estimated sewage flows. Since the consumption of potable water will always be greater than sewage flows, a factor of 1.15 has been utilized with the estimated sewage flow to determine the flow rates. Peak factor is based on ratio of peak hourly flow to design average flow i.e. (18 + √P) / (4 + √P) Where P is a Population per 1,000 (Assuming P = Zero), worst case scenario So, the peak factor = 4.5 Below are the estimated flow demands calculations for proposed Hobby Lobby and existing Steak house: Proposed Hobby Lobby:

Number of employees: 32 Flow rates per employee: 15 gpd (Based on 64E-6.008 Table l) X 1.15 = 17.25 gpd Average potable water demand: 32 x 17.25 gpd = 552 gpd Peak potable water demand: 552 gpd x 4.5 = 2,484 gpd = 3.76 gpm (Hours of operation = 11 hours) Existing Outback Steakhouse: Number of bar seats and regular seats are 69 and 158 respectively. Flow rates for bar seats and regular seats 20 gpd and 40 gpd respectively (previously permitted) Average potable water = (69* 20) + (158* 40) = 7700 gpd Peak potable water = 7700 gpd x 4.5 = 3,4650 gpd = 36.1 gpm ( Hours of operation = 16 hours)


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3.3.1 WaterCAD: Potable water Layout


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3.3.1.1 Potable Reservoir Table:

3.3.1.2 Potable Junction Table:

3.3.1.3 Potable Pipe Table:


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3.4 FIRE FLOW ANALYSIS

The Hobby Lobby building is type ll (000) construction and is sprinklered. The fire flow was calculated for the building. This calculation resulted in a necessary fire flow of 1250 gallons per minute in addition to domestic requirements at a residual pressure of not less than twenty (20) psi. A table showing the fire flow calculation for the proposed building can be seen below:

The conducted fire flow indicates an available 2985 gpm @ 20 psi residual. The design service connection pressure is based on Collier County’s Utility Ordinance. Based on above calculation the conducted fire flow is adequate to handle the required fire flow. The fire flow test result is shown next page:

Building Type II (000)

Building Area 55,011 Sq. Ft.

Base Flow 5,000 gpm

75% Sprinkler Reduction 3,750 gpm

Required Fire Flow 1,250 gpm

Note: Fire flows are determined by FFPC, 5th

Edition

Fire Flow Calculation


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3.4.1 WaterCAD: Fire Layout


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3.4.1.1 Fire Flow Table:


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Fire system detector check assembly: Flow vs Headloss Curve:


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3.5 CHLORAMINE DISSIPATION

The calculation method was based on the criteria outlined in the update to the Collier County Utility Design Manual Section 1.2.1. WaterCAD was utilized to calculate the longest travel time. The Longest travel time is 0.242 hours (0.003 hrs + 0.156 hrs + 0.083 hrs) which is less than 100.33 hours.

3.5.1 Chloramine dissipation Layout:


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3.5.2 Chloramine dissipation table:


4 SEWER HYRAULIC ANALYSIS

4.1 SYSTEM PERFORMANCE

The Triangle Plaza at Lely Resort will be served by an onsite gravity system discharging to the existing triangle Boulevard lift station. The sewer provider is Collier County Public Utilities.

4.2 SEWER CALCULATIONS

Due to the proposed Hobby Lobby building, existing sewer main has been relocated. Lateral has been proposed to the proposed Hobby Lobby building. Please see below for calculations showing the adequacy of the system.

4.2.1 Estimated average daily flow summary:

Proposed Hobby Lobby: Number of employees = 32 Flow per employee = 15 GPD Total average daily flow = 32* 15 GPD = 480 GPD

= 0.73 GPM (11 Hours of Operation) Peak factor = (18 + √P) / (4 + √P) Where P is a Population per 1,000 (P=zero,worst case scenario)

So the peak factor = 4.5

Design Peak Total 0.73 GPM * 4.5 = 3.27 GPM

Existing Outback Steakhouse: Estimated flow for Outback Steakhouse is obtained from previously permitted report. The calculation is shown below: Units/Seats = 227 Per capita Flow = 33.98 GPD Average Daily flow = 7,714 GPD Peak Factor = 4 Design Peak flow = 7,714 GPD x 4= 30,856 GPD = 21.43 GPM Future Building: Flows for future building is consider as 15 GPD per 100 square feet of floor space based on DEP 64E-6.008 Table l. Total square footage of building = 6,000 Average daily flow = (6,000/100) x 15 GPD = 900 GPD Peak factor = 4.5 (Worst Case Scenario) Design Peak flow = 900 GPD x 4.5 = 4,050 GPD = 2.81GPM Total Sewage flow from existing Steakhouse, proposed Hobby Lobby and future Building (3.27+21.43+2.81) GPM = 27.51 GPM


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4.2.2 Gravity Sewer Pipe Capacity Using the Manning’s formula to calculate the capacity of gravity sewer flowing half-full with a slope and a Manning’s n-value of 0.013 yields the following capacities. Each run of gravity sewer was analyzed to confirm that the gravity sewer was adequately sized to handle incoming flows.

Q = Discharge (cu. ft./sec.) A = Cross-sectional Area of Flow (sq. ft.) n = Coefficient of Roughness R = Hydraulic Radius (ft.) S = Slope of Pipe (ft./ft.)

Pipe Size

(ft)

Area

(sf)

Coefficient of

Roughness (n)

Hydraulic

Radius

Wetted

PerimeterSlope

1/2 Full

Flow (cfs)

1/2 Full

Flow (gpm)

6 0.098 0.013 0.125 0.785 0.0104 0.285 127.68

8 0.174 0.013 0.167 1.047 0.0040 0.382 171.3

10 0.273 0.013 0.208 1.308 0.0028 0.579 259.9

12 0.393 0.013 0.250 1.570 0.0022 0.835 374.7

15 0.613 0.013 0.313 1.963 0.0015 1.250 561.0


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5 ENGINEER’S OPINION OF PROBABLE COST

_________________________

Christopher R. Mitchell, P.E. FL License No. 56740

Paving = $460,192.21

Demolition = $10,000.00

Potable Water Distribution = $2,733.50

Erosion Control = $5,500.00

Landscape = $55,000.00

Drainage = $30,133.00

= $563,558.71Total Paving, Earthwork, Landscape, Lighting & Drainage Costs

Triangle Plaza at Lely Resort


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PavingDESCRIPTION UNIT QTY UNIT PRICE TOTAL PRICE

3/4'"Asphalt Concrete (type S-III) 1st lift SY 11,976 $4.35 $52,095.60

3/4" Asphalt Concrete (type S-III) 2nd lift SY 11,976 $4.70 $56,287.20

8" Limerock Base (compact & prime) SY 11,976 $9.00 $107,784.00

12" Stablized Subgrade SY 12,278 $1.95 $23,942.10

6" Thick Non-Reinforced Concrete pad SY 213 $27.00 $5,751.00

8" Limerock Base (compact & prime) SY 213 $9.00 $1,917.00

12" Stablized Subgrade SY 213 $1.95 $415.35

4" Thick Non-Reinforced Concrete Sidewalk SY 5,342 $23.77 $126,979.34

12" Stablized Subgrade SY 5,342 $1.95 $10,416.90

2' Sod (back-of-curb) SY 344 $1.50 $516.00

Type "F" Curb LF 234 $10.73 $2,510.82

Type "D" Curb LF 3,357 $11.70 $39,276.90

Wheel Stop ( New Only) EA 162 $150.00 $24,300.00

Signage and Striping LS 1 $8,000.00 $8,000.00

SUBTOTAL $460,192.21

Demolition

DESCRIPTION UNIT QTY UNIT PRICE TOTAL PRICE

Lump Sum LS 1 $10,000.00 $10,000.00

SUBTOTAL $10,000.00

Erosion Control


Silt Fence & Inlet protection, LS 1 $5,500.00 $5,500.00

SUBTOTAL $5,500.00


General Trees, Mulch, Landscape Irrigation LS 1 $55,000.00 $55,000.00

SUBTOTAL $55,000.00

Landscape

DrainageDESCRIPTION UNIT QTY UNIT PRICE TOTAL PRICE

15" RCP LF 64 $28.00 $1,792.00

25"x30" ERCP LF 133 $47.00 $6,251.00

24"x38" ERCP LF 30 $45.00 $1,350.00

30" RCP LF 91 $47.00 $4,277.00

6" HDPE LF 155 $14.00 $2,170.00

Grate Inlet EA 4 $2,800.00 $11,200.00

Junction Box EA 1 $3,093.00 $3,093.00

SUBTOTAL $30,133.00

Potable Water System


6" C-900, CL200 Fire Main LF 129 $21.50 $2,773.50

TOTAL $2,773.50


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6 APPENDICES

6.1 SITE LOCATION MAP


6.2 “TEN STATES STANDARDS” RECOMMENDED STANDARDS FOR WASTEWATER FACILITIES

TRIANGLE PLAZA AT LELY RESORT

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