city gate self-storage

4365 Radio Road, Suite 201 ▪ Naples, FL 34104 ▪ P (239) 434.6060 ▪ F (239) 434.6084 www.davidsonengineering.com

Engineering Report City Gate Self-Storage

PREPARED FOR:

Diversified Companies 6300 NE 1st Avenue, Suite One

Fort Lauderdale, FL 33334

PREPARED BY: Davidson Engineering, Inc. 4365 Radio Road, Suite 201

Naples, Florida 34104

February 12, 2016 REVISED April 14, 2016

_________________________________________________

Ryan A. White, P.E., Registration No. 67400 Company ID No. 9496

http://www.davidsonengineering.com/

TABLE OF CONTENTS General: ......................................................................................................................................................... 1

Existing Conditions: ....................................................................................................................................... 1

Plan of Construction: .................................................................................................................................... 1

Potable Water Supply: .................................................................................................................................. 2

General Use and Irrigation ........................................................................................................................ 2

Fire Protection .......................................................................................................................................... 2

Sanitary Sewer: ............................................................................................................................................. 2

General ...................................................................................................................................................... 2

Gravity Sewer Hydraulics .......................................................................................................................... 3

Storm Water Management: .......................................................................................................................... 3

Methodology ............................................................................................................................................. 3

Appendix A: Collier County Water Meter Sizing Sheet

Appendix B: NFPA Fire Flow Requirements

Appendix C: WaterCAD®

Appendix D: StormCAD®

1

General: City Gate Storage is a ±4.32 acre development proposed to be located on Lots 10, 11, and 12 within City Gate Commerce Center Phase One. The project is located on White Lake Boulevard adjacent to County Road 951 and Interstate-75 interchange (Exit 101) in Section 35 Township 49 South, Range 26 East, Collier County, Florida. The project proposes to construct a ±134,272 square foot self-storage facility with associated parking and infrastructure within the appropriated developable envelope.

Existing Conditions: The proposed project lies within City Gate Commerce Center Phase One zoned under City Gate Commerce Park PUD and DRI. Phase one is planned to provide a variety of commercial services to highway travelers, with a special emphasis on the provision of service to interstate travelers.

The project site has been identified as Lots 10, 11, and 12 within the aforementioned development. Access will be granted via White Lake Blvd. Each lot has been provided with gravity sanitary sewer tie-in points, potable water supply availability, and water management facilities accommodating up to 55% impervious build-out conditions per approved ERP #11-01863-P.

Plan of Construction: The project proposes to improve the undeveloped site into a self-storage facility with general office. The proposed development will also include the following necessary on-site infrastructure: potable water and sanitary utility connections, storm water management areas, necessary parking requirements, and two access points onto White Lake Boulevard.

The infrastructure construction will commence upon Collier County and South Florida Water Management District (SFMWD) approval and permit issuance. A construction schedule will be provided to all interested parties at the pre-construction meeting.

2

Potable Water Supply:

General Use and Irrigation

Water service will be provided through Collier County. An existing 20-inch water main has been extended throughout City Gate Commerce Center - Phase One within the White Lake Boulevard right-of-way. The proposed development has been provided a 6-inch stub-out and will extend a 1.5-inch service line to equip the site for potable water use; meters to be sized by Collier County. The proposed potable water meter will be sized according to Collier County meter sizing worksheet, Appendix A.

Irrigation will be supplied via the existing 6” water main stub-out. A 1-inch irrigation meter is proposed adjacent to the potable water mater to provide irrigation service to the project. Fire Protection Water for fire protection will be provided by Collier County via the extension of the 8-inch main. At the right-of-way easement line a 8-inch backflow preventer will be installed where 745 LF of 8-inch main will extend onto the property supplying the site with a dedicated fire line. The fire main will provide the site with three hydrants and fire prevention for the on-site facilities. Using the NFPA Required Fire Flow Table, the required fire flow for the proposed building type is as follows, please refer to Appendix B.

Construction Type for Commercial Buildings: IBC II-B/NFPA 220 II(000)

Self-Storage Building Fire Area: 129,382 sf Required Fire Flow: 7,750 GPM

Required Fire Flow after 75% Reduction: 1,938 GPM The proposed hydrants were modeled to serve the facility with the minimum required 1,938 GPM. Based on WaterCAD ® results, Appendix C, the hydrants located throughout the project site will provide adequate water supply to exceed the minimum required flow based on a the approved deviation to allow the residual pressure be modeled at the infield conditions of 50 psi.

Sanitary Sewer: General

The wastewater collection system has been previously designed and permitted to accommodate wastewater flows from the future development uses. The existing infrastructure has supplied the proposed building with a lateral stub-out.

Estimated flows were obtained from the Florida Building Code and F.A.C. 64E-6. The following calculations have been utilized for sizing sewer infrastructure.

3

Table 1: City Gate Self-Storage Facility

Description Unit Type GPD/Unit # Units Average Daily Demand, GPD

Peak Daily Demand, GPD*

General Office 90 sf SF 15 1 15 68

Self-Storage 947 Units Unit/

2 Units > 200 1 1 200 374 574 2,583

Total (GPD): 589 gpd 2,651 gpd Based on FAC; 64E-6.008 System Size Determinations *Factor of 4.50 was used to determine Peak Daily Demand

Gravity Sewer Hydraulics

Pipe Diameter = 6-inches Average Flow = 589 GPD = 0.001 cfs Peak Flow = 2,651 GPD = 0.004 cfs Slope = 0.0104 Manning n-value = 0.013 Average Depth = 0.015-feet = 0.18-inches Average Velocity = 0.551 fps Peak Depth = 0.029-feet = 0.348-inches Peak Velocity = 0.839 fps These calculations confirm the six (6) inch gravity sewer pipes are more than adequate in size for the proposed flow.

Storm Water Management:

Methodology

The overall concept of the water management design is dictated by the assumed impervious calculations for the site and has been previously permitted under ERP No. 11-001863-P. The proposed ±4.32 acre development is located within Phase 1 of the City Gate Commerce Development, with a permitted control elevation of 6.23 ft-NAVD. The property was previously permitted under conceptual approval for commercial use with a maximum 55% impervious with existing water management facilities in place including the required 0.5” pretreatment for commercial areas.

We have proposed to construct the site to 64.81% which is greater than the allowable 55.00%. An additional 2.5” of water quality will be provided onsite to account for this percent impervious overage on the site; refer to the following calculations:

4

Required Additional Quality and Quantity Requirements:

Area in Excess of 55% Threshold: 188,179 SF (55%) = 103,498 SF 121,968 SF (64.81%) – 103,498 SF (55%) = 18,470 SF (9.81%)

Additional Treatment Volume Required:

18,470 SF x 2.5” = 0.085 Ac-ft = 3,848 CF Additional Treatment Volume Provided: 3,879 CF within Proposed Detention Pond #1 from elevation 9.00 – 10.25 ft-NAVD

2.5” Additional Water Quality Required:

2.5” Additional Water Quality Provided:

3,848 CF 3,879 CF By abiding by the existing permit stipulations and providing additional water quality/quantity on-iste, it can be established there will be no effects on the existing storm water management system.

StormCAD® Results:

To ensure the interconnected pipes are of the appropriate size, StormCAD® was utilized. The StormCAD® program analyzes the storm sewer systems using the Rational Method and recommends pipe sizes. Each catchment basin was assigned a “C”-value based on the type of land usage. The design storm used is the 10 year-10 minute recurrence interval that provides a rainfall intensity of 6.9 inches per hour. Based on the storm events modeled above, the size and slope of the storm drainage pipes were designed to produce velocities that will minimize sedimentation and provide flushing of the culverts. The results from the program indicate that the minimum pipe size is 18 inch and the maximum pipe size is 24 inch throughout the property with discharge into water management detention/retention areas and swales will be adequate. The full results of the StormCAD® Storm Sewer model are in Appendix D.

APPENDIX A

Collier County Water Meter Sizing Worksheet

Effective: January 1, 2015

Preparer's Information: Project Information: Date ====>

Name ============> Permit or AR Number

Title ==============> Name of Project ===>

Company=========> Project Address ===>

Address ==========>

Phone ============>

Email Address =====>

Please Note:

3. For remodeling projects this form must be submitted only if there is a net increase in Fixture Flow Value.

25.5Demand

Range (GPM) Meter Size

0 to 30 3/4"

30.1 to 50 1"

3/4" 50.1 to 100 1 1/2"

100.1 to 160 2"

160.1 to 450 3"

450.1 to 1000 4"

Type or Print Name of Engineer/Architect of Record for Project

Signature of Engineer/Architect of Record for Project and Date

12-Feb-16

PL20150002770

City Gate Self Storage

Lots 10-12 in City Gate Commerce Park Phase One

Ryan White

Production Manager

Davidson Engineer

4365 Radio Road, Suite 201

Water Meter Sizing FormOne Form Per Meter

Please call Public Utilities Engineering (239) 252-2583 with any questions.

(If the meter is existing, Engineer/Architect must identify the meter manufacturer and model number)

Meter Size in Inches

434-6060

[email protected]

Naples, Florida 34104

[Affix Engineering/Architect Stamp Here]

1. All commercial facilities must be metered separately from residential facilities with the exception of those commercial facilities that are within a master metered residential development and designed for the exclusive use of the residents within such development.

2. The Design Engineer/Architect must submit signed and sealed documentation supporting meter sizing. For meters 4-inch and smaller the sizing shall be based upon Fixture Flow Values as shown on the following page and sized as per the Table on page 3 unless approved otherwise by the Collier County Public Utilities Planning and Project Management Department. For all meters the Engineer/Architect must consider all relevant factors before selecting the final meter size.

This Section to be filled out by Engineer/Architect of Record:

(Engineer/Architect must attach a completed Fixture Flow Value Worksheet)

Demand in accordance with the Fixture Flow Value Worksheet and the Table for Estimating Demand

Effective: January 1, 2015

Flow Rate # of Fixtures Per Unit Fixture Flow Value

Automatic clothes Washer Commercial 3 x 0 = Residential 2 x 0 = Bathroom group

5 x 0 = 4 x 0 = 2 x 0 = 1 x 0 =

2.75 x = 0.75 x =

3 x = 5 x 4 = 20

2 x 1 = 24 x = 2 x 2 = 43 x 1 = 32 x =

Standard 4 x = Flushless 0 x = Valve* Gallons/Flush = x10 x =

Water ClosetFlushometer valve* Gallons/Flush = 1.6 x10 16 x = Flushometer tank 1.6 x = Tank 4 x 2 = 8

For any fixtures not listed, submit manufacturer's data sheets and enter appropriate description and value:3 x = 10 x =

x = x = x =

37137

Wash

Bidet

Lavatory

Dental unit or cuspidorDishwasher, residentialDrinking fountainShowerSillcock, hose bibb

Bathtub

Laundry tray Kitchen, residentialSink (per faucet)

Service

Urinal

**Use total Fixture Flow Value on "Table for Estimating Demand" to estimate water meter demand.

As defined in FL Plumbing Code Section 202 (1.6 gpf water closet)

Fixture

Total Fixture Value Per Unit =====>Number of Units with this Fixture Count =====>

Grand Total of Fixture Flow Value (Per Unit Total x Number of Units)** =====>

Other:Other:

Fixture Flow Value Worksheet

*Valves are calculated using a flush rate of 10 flushes per minute (according to Florida Plumbing Code). The flow rate is 10 times the gallons per flush. The fixture flow value is calculated as follows: Number of Valves Calculation 1 - 2 Flow Rate times Number of Fixtures. 3 - 10 Flow Rate times two plus two times the Number of Fixtures. 11 or more Flow Rate times Number of Fixtures divided by two.

Please call Public Utilities Engineering (239) 252-2583 with any questions.

Supporting Documentation

Enter # of Fixtures of each Fixture Type, per unit, then multiply by appropriate Flow Rate to get Fixture Value

Other: Eye WashOther: Comm. DishwasherOther:

APPENDIX B

NFPA Fire Flow Requirements

NFPA 220 I(442) I(332) II(222) II(111) II(000) III(211) III(200) IV(2HH) V(111) V(000)

IBC ---- IA IB IIA IIB IIIA IIIB IVHT VA VB

CROSS-REFERENCE OF BUILDING CONSTRUCTION TYPES

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Rectangle

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Unmarked set by ryan.white

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APPENDIX C

WaterCAD®

Scenario: Base

P-5

P-8

P-6 J-2

J-1

R-1

H-3

H-2

H-1

GPV-1

Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

2/12/2016

Bentley WaterCAD V8i (SELECTseries 5)[08.11.05.61]Bentley Systems, Inc. Haestad Methods Solution Center2016-02-12-watercad.wtg

Jenna.Woodward

Oval

Jenna.Woodward

Oval

Jenna.Woodward

Oval

Jenna.Woodward

Callout

HYDRANT #1

Jenna.Woodward

Callout

HYDRANT #2

Jenna.Woodward

Callout

HYDRANT #3

Fire Flow Node FlexTable: Fire Flow ReportLabelPressure (Calculated Residual @

Total Flow Needed)(psi)

Pressure Head(ft)

Flow (Total Available)

(gpm)

Flow (Total Needed)(gpm)

Fire Flow (Needed)

(gpm)

Satisfies Fire Flow

Constraints?H-124108.412,1271,9381,938TrueH-228108.412,3951,9381,938TrueH-334108.413,0891,9381,938TrueJ-142108.413,50000TrueJ-240108.413,49000True


4/13/2016


FlexTable: Reservoir TableHydraulic Grade

(ft)Elevation

(ft)Label

115.33115.33R-1


2/16/2016


FlexTable: Pipe TableHazen-Williams CMaterialDiameter

(in)Stop NodeStart NodeLength (Scaled)

(ft)150.0PVC7.7J-2J-1240150.0PVC7.7H-1J-2223150.0PVC5.9J-1H-314150.0PVC5.9J-2H-215150.0PVC7.7GPV-1R-19150.0PVC7.7J-1GPV-1294


2/12/2016


General Purpose Valve Headloss Curve Detailed Report: 8" Backflow

Element Details

48ID Notes8" BackflowLabel

Headloss(ft)

Flow(gpm)

6.92016.155014.3025013.8450011.531,00014.071,50016.152,000

Graph

Hea

dlos

s (f

t)

17.00

16.00

15.00

14.00

13.00

12.00

11.00

10.00

9.00

8.00

7.00

6.00

Flow (gpm)1,5001,0005000


2/12/2016

Bentley WaterCAD V8i (SELECTseries 5)[08.11.05.61]

Bentley Systems, Inc. Haestad Methods Solution Center2016-02-12-watercad.wtg

APPENDIX D

StormCAD®

Scenario: Base

#206


2/12/2016

Bentley StormCAD V8i (SELECTseries 4)[08.11.04.54]Bentley Systems, Inc. Haestad Methods Solution Center2016-02-12-STORMCAD.stsw

Conduit FlexTable: DOT ReportVelocity(ft/s)

Section Discharge Capacity

(cfs)

-Invert- Upstream Downstream

(ft)

-HGL- Upstream Downstream

(ft)

-Ground- Upstream

Downstream(ft)

-EGL- Upstream Downstream

(ft)

-Depth- Upstream Downstream

(ft)

-Node- Upstream Downstream

0.981.736.909.4511.009.472.55STR. #1014.466.709.4212.009.442.72STR.#102

0.941.676.709.4212.009.432.72STR.#1023.796.009.3810.709.403.38STR.#103

1.364.286.009.3810.709.413.38STR.#1038.465.809.3310.709.363.53STR.#104

2.086.555.809.3310.709.403.53STR.#1048.295.609.2111.309.273.61STR.#105

2.457.705.609.2111.309.303.61STR.#1056.455.509.0610.709.163.56STR.#106

4.1513.025.509.0610.709.333.56STR.#1060.005.509.009.00(N/A)(N/A)STR.#110

1.093.416.309.2110.709.222.91STR.#1094.866.109.1610.709.173.06STR.#108

1.023.196.109.1610.709.173.06STR.#1085.236.109.1210.709.143.02STR.#107

1.464.606.109.1210.709.153.02STR.#1076.135.509.0610.709.163.56STR.#106


2/17/2016


FlexTable: Conduit TableMaterialLength (User

Defined)(ft)

Manning's nDiameter(in)

Slope (Calculated)(ft/ft)

Invert (Stop)(ft)

Invert (Start)(ft)

Stop NodeStart Node

Concrete111.00.01318.00.0027.207.40STR.#102STR. #101Concrete154.00.01318.00.0017.007.20STR.#103STR.#102Concrete143.00.01324.00.0016.306.50STR.#104STR.#103Concrete149.00.01324.00.0016.106.30STR.#105STR.#104Concrete123.00.01324.00.0016.006.10STR.#106STR.#105Concrete19.00.01324.00.0006.006.00STR.#110STR.#106Concrete217.00.01324.00.0006.706.80STR.#108STR.#109Concrete187.00.01324.00.0016.606.70STR.#107STR.#108Concrete136.00.01324.00.0016.506.60STR.#106STR.#107


2/17/2016


Profile ReportEngineering Profile - STR.#109 to STR.#106 (2016-02-12-STORMCAD.stsw)


2/17/2016


Profile ReportEngineering Profile - STR. #101 to STR.#110 (2016-02-12-STORMCAD.stsw)


2/17/2016


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