PR22579_McIntosh_Preserve_Evaluation_Update.pdf

PRESTO GEOSYSTEMS

670 North Perkins Street Appleton, WI 54914 USA

Tel: 1 920 738 1104 Email: sam.justice@prestogeo.com

\\rcp\appleton\Groups\GeoSystems\PROJECT Designs and Comm\2022 PR220XXX's\PR22579 McIntosh Preserve FL\channel letter - rev 1.doc

October 11, 2022

Jeffrey PeQueen

DEWBERRY

Lakeland, FL 33803

RE: PR22579 – MCINTOSH PRESERVE

Channel Protection System

Dear Jeffrey:

Presto Geosystems has completed the evaluation for the McIntosh Preserve Channel Protection

System project, located in Plant City, FL. Our recommendations are provided and detailed in the attached cross section and calculation. The evaluation is copyrighted and based on the unique engineering properties of Geoweb® system. Any use of this evaluation for any product other than that manufactured by Presto Products makes this evaluation invalid.

The objective of this evaluation is to propose a Geoweb cellular confinement system for stabilization of the channel. It is assumed herein that the channel is stable against failure except for the problem of surface erosion.

As the originator and leader in geocell technology, Presto offers the following advantages:

• Manufacturer Certificate of Analysis. Presto Geosystems manufactures Geoweb, ATRA keys

ATRA Stake Clips in accordance with stringent ISO and CE quality standards. Our quality management system allows Presto to provide Certificates of Compliance (COC) and Certificates of

Analysis (COA) that allow traceability on all materials produced and supplied for this project. We do not provide geocell materials through private label manufacturers, which is often the case with our competitors. The ability for the Owner to receive COC and COA for geocell is critical to the integrity of the project.

• Design Calculations. The attached calculations are based specifically on Geoweb material characteristics, research/testing and accessories. Our design calculations are based on the site-specific characteristics and information contained in the request for project evaluation. The recommendations are based on Geoweb panels, ATRA® key connection device and ATRA tendon

\\rcp\appleton\Groups\GeoSystems\PROJECT Designs and Comm\2022 PR220XXX's\PR22579 McIntosh Preserve FL\channel letter - rev 1.doc clip load transfer device. The anchorage recommendations are specific to our product and DO

NOT apply to any other geocell manufacturers.

• ATRA Key connection device. ATRA keys provide a permanent and stronger panel connection compared to metal staples or zip ties. ATRA keys are made of high density polyethylene and are the strongest method available for panel connection. ATRA keys will not corrode or degrade and provide a permanent connection. ATRA keys were used to determine the anchorage recommendations. If a different connection device is proposed, the Presto recommendation DOES

NOT apply. ATRA keys allow multiple panels to be installed concurrently decreasing installation time and preventing panel separation during installation and compaction. Panel separation may occur with metal staples or zip ties during installation, which can lead to long-term maintenance issues.

• Installation Assistance. Representatives of Presto, or the local distributor, are available to be on-site at the beginning of construction to ensure that the Geoweb panels and accessories are installed as the design intended. We are committed to train the Contractor based on our in-depth product knowledge and installation experience. Our past project successes will minimize installation time and issues. As with any material, there are advantageous techniques of installation, which we can offer during our visit.

Design and Materials

It is our understanding that the relevant dimensions of the channel, for the purpose of this analysis, are as follows:

Parameters:

Flow, ft3/s 1500

Velocity, ft/s 47.32

Base Width, ft Varies (12 minimum)

Side Slopes 4H:1V to 20H:1V

Channel Depth, ft Varies (5 maximum)

Bed Slope, % 25%

Friction Angle φ, degree: 28

Infill Type: Concrete

Infill Weight γ, lbs/ft3 150

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Based on the evaluation, the following materials are recommended for the Geoweb application at the site:

1. Presto Geosystems Geoweb GW30V4 (4-inch) panels.

2. Provide a non-woven geotextile separation layer over the prepared sub grade. Install in accordance with Manufacturer recommendations including overlaps.

3. Connect the Geoweb sections with ATRA® Keys at each interleaf and end to end connection.

4. Provide 24 inch ATRA® Anchors in cells 1, 4 and 7 in the horizontal and every 3rd row down the slope (3 x 3 cell pattern).

5. Pre-shape the Geoweb system before infill placement.

6. Provide Geoweb crest anchorage as shown on the cross section.

7. Limit the drop of the infill into the Geoweb panels to prevent distortion.

8. Geoweb infill shall be concrete.

a. Adjust the concrete slump in the field as necessary to allow for installation.

b. Screed concrete flush with the top of the Geoweb cell walls. Do not overfill.

For additional Channel Protection Resources, click here:

Channel Design Engineering Resource Package

If you have any questions or need any additional information, please call.

Sincerely, Sam Justice, P.E.

Civil Design Engineer Presto Geosystems https://2y2qpw2op3o93ygu164frm9z-wpengine.netdna-ssl.com/wp-content/uploads/2019/05/GEOWEB-Channel-Design-Package.pdf

CHANNEL PROTECTION

PRESTO GEOWEB

Project Name: MCINTOSH PRESERVE Presto Project Number:

Date:

PR 22579

10/11/2022

INPUT PARAMETERS

E Coefficient, Cm Gravity

1.49 32.174 Channel Lining System Typical Kb Values

Concrete Concrete

1.20 1500.0

25.0 Typical N Values for Lined Channel

5.00 Concrete Rough = 0.018 to 0.027

0.018 Aggregate Firm = 0.023

0.018 Vegetated w/Grass & Weeds = 0.025

12.00 Flow Area 31.70

1.69 Wetted Perimeter 25.94

4.00 Hydraulic Radius 1.222

25.52 R^2/3 1.143

47.32

1500.19 Compare to Specified Flow Rate

6.52

4 0.33 ft 28 0.489

1.69

25.00 0.245 radians 62.4 0.53 31.64

Kb (Bend Coefficient)

Straight Reach: 1.0 Mild Meandors: 1.1 to 1.4 Looping Meandors: 1.5 to 1.8 Sharp Turns: 1.9 to 2.1

Manning's Coefficient Side Slopes

Top Width 'T' of Flow line

Velocity (ft/s) Flow (cfs)

English or Metric (E or M)

Invert:

Coefficient of Friction (Infill/Soil)

Bed Slope, % Channel Depth (ft) Manning's Coefficient Invert

Froude No., F

Bedslope (%) Unit Weight of Water (lb/ft3)

Base Width (ft) Water Depth (ft) Side Slope (xH:1V)

Channel Bottom - Stream Direction Stresses

Tractive Shear Stress (lb/ft2)

Geoweb Thickness (in) Unit Weight of Infill (lb/ft3) Interface Friction (Geoweb/Infill) Depth of Flow (ft)

Sides:

Max Discharge (cfs)

Trial Channel Dimensions

SLOPE PROTECTION SYSTEM

PRESTO GEOWEB®

Project Name: MCINTOSH PRESERVE Presto Project Number: PR 22579 Date: 10/11/2022

INPUT PARAMETERS

English or Metric (E or M) E Slope Angle 14 Slope (H:V) Slope Length (ft) 20.67 4.01 Vertical Height (ft) 5 Minimum Interface Friction Angle (degrees) 28 Between Different Surfaces Geoweb Cell Type GW30V Web Thickness (in) 4 Infill type Concrete Infill Weight (lb/ft) Infill Unit Weight (lb/ft3) 150 1033.4 Additional Cover (in.) 0 Cover Weight (lb/ft) Cover Unit Weight (lb/ft3) 0 0.0 Design Factor of Safety 1.4 Total Weight (lb/ft) Tractive Force (lb/ft) 53.5 1033.4 Passive Resistance at toe (Y or N) No Tractive force = 31.64 psf @ 1.69 ft water depth.

Angle of internal friction of soil at toe 0 Unit weight of soil at toe (lb/ft3) 0

Calculations Factored Geoweb Seam Strength (lb/ft) 234.67 Allowable Tensile Driving Force (lb/ft) 303.47 Weight+Toe Load (Gravity) Factored Driving Force (lb/ft) 350.00 Weight Only Factored Driving Force (lb/ft) 403.47 Weight+Toe Load Resisting Force (lb/ft) 533.14 Shear Only (Min Between Surfaces) Passive Earth Force (lb/ft) 0.00 Available Resistance (lb/ft) 234.67 Geoweb Factor of Safety 1.76 Shear Only Maximum Available F.S. 2.53 Shear and Geoweb Seam Strength

ATRA® KEY

Connection Strength 275 lbs/ft

ATRA® ANCHOR DETAILS

Max. Unrestrained GW length (ft) No Limit Unrestrained Input Parameters Length (in) 24 ATRA Anchor Spacing Diameter or Width (in) 0.50 Downslope Spacing (in) Downslope spacing (# of cells) 3 No Limit 34.2 Horizontal spacing (# of cells) 3 37.8 Soil Friction Angle (degrees) 28 Soil Cohesion (lb/ft2) 0 Slope Soil Type Native Unit Weight (lb/ft3) 100

Kp (Coefficient) 2.77 Buried Anchor Length (ft) 1.67 Anchor Resistance (lb) 16.03 Single Anchor Number of Rows of Anchors 8 Anchor Resistance (lb/ft) 40.7 Resultant Anchor Resistance (lb/ft2) 1.97 Net Resultant Resisting Force (lb/ft) 574 Shear plus Anchors

Anchor density (anchors/ft2) 0.11 Anchors per Geoweb Section Width 26 Factor of Safety 1.89 Shear and Atra Anchored Geoweb

Note: Anchorage pattern is based on the use of ATRA keys for panel to panel connection. If staples or zip ties are used, the anchorage pattern will increase.

Note: Anchorage pattern is based on the use of ATRA keys for panel to panel connection. If staples or zip ties are used, the anchorage pattern will increase.

http://www.prestogeo.com/downloads/hbWvJary0msSu0lqQeXW2BCjRrV8wKfOl2AvSrjRURkERLvhqI/ATRAandATRAGFRPAnchorSpecification.pdf� http://www.prestogeo.com/downloads/PvLW0y0kuzc8jVk9DaC3WnyTrE6oi65THQS7Q4qGWopsPovpFy/ATRAKeySpecification.pdf�

SLOPE PROTECTION SYSTEM

PRESTO GEOWEB®

TENDONS

Required Tension (lb/ft) -170 Tendons only

Input Parameters Tendon Type No Tendons Ultimate Strength (lb) 0 F.S. (Creep) 1.10 F.S. (Knots) 1.10 F.S. (Construction damage) 1.10 F.S. (Chemical/Biological Durability) 1.10 F.S. (Overall Uncertainties) 1.25 Overall Factor of Safety 1.83 Number of Tendons/GW Section 0 ATRA Tendon Clip Spacing (no. of cells downslope) 0 Maximum Allowable No Limit

Tendon Hole Spacing (in) 12.6 Available Tension/tendon (lb) 0 Average No. of Tendons/slot 0 Available Tension/slot (lb) 0.0 Available Tension (lb/ft) 0 OK

Tendon density (ft/ft2) 0.000 Includes 15% extra for knots and wastage Tendon Length per 8.5' Geoweb Section 0 and deadman bury length.

Atra Tendon Clips/8.5' Geoweb Section 0 Atra Tendon Clip Density (#/ft2) 0.000

Factor of Safety No Tendons Shear and Tendon Anchorage

CREST/SLOPE ANCHORAGE

Required Anchorage (lb/ft) -149

Input Parameters Horizontal Embedment Length (ft) 1 From Slope Face to Key Trench Depth Below Crest (in) 4 Crest to Bottom of Geoweb Slope Angle of Key Trench (degrees) 45 Depth of Key Trench (in) 12 Horiz. Length at Bottom of Trench (in) 0 Soil Unit Weight (lb/ft3) 100 Soil Friction (degrees) 28

Available Resisting Force (lb/ft) 50.99 OK

Factor of Safety 2.06 Crest Anchorage and Atra Anchors

Limitation of Use:

The Evaluation is copyrighted and based on the use of Genuine Geoweb® and specifically designed accessories. The recommendations in this Evaluation are based on the specific characteristics, structural values and specifications of the complete Geoweb® system and all associated connection, load transfer and anchoring accessories as noted in the evaluation. All rights are reserved. Any use of the Evaluation for any geocell product and/or alternative accessories other than that provided by Presto Products Company is strictly prohibited and makes this evaluation invalid. Presto Products Company assumes no liability resulting from the unauthorized use of this evaluation.

Note: Tendons and load transfer device quantity and spacing is based on the use of only ATRA Tendon Clips for load transfer. If substitute devices are used, this analysis is void.

http://www.prestogeo.com/downloads/bJ9CDdGheLganOICTRLVTFTRNAVEzg0fiC9ojc1v0QYNZbgqm3/ATRATendonClipSpecification.pdf�

Justice, Sam M.

From: projectevaluation@info.prestogeo.com Sent: Tuesday, October 11, 2022 10:27 AM To: Taylor, Alex J.; Dickey, Michael J.; Wedin, Bryan S.; Schneider, Cory S.; Bouchard, Katie L.;

Beyer, Ashley J.; Vander Linden, Jennifer A.; George, Jose Pablo; Justice, Sam M.

Subject: New submission from Free Project Evaluation : Channel Protection System

CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.

Contact Name

Jeffrey PeQueen

Company Name

Dewberry

Email jpequeen@dewberry.com

Phone Number

8136134304

Street Address

Dewberry

City

Lakeland

State or Province

Florida

Zip or Postal Code

33803

Country

United States

Relationship with Project

Consulting Engineer

Did you speak with a Presto Distributor/Rep about your project?

Yes

If yes, who did you speak with?

Jeff Peterson of RH Moore in Tampa, FL

Project Name

McIntosh Preserve

Project City

Plant City

Project State or Province

Florida

Project Country

USA

Estimated GEOWEB Area

50,000

Units of Measure for GEOWEB Area

Standard

Describe problem to be solved by the GEOWEB system

8 separate spillways proposed with widely varying dimensions throughout an environmental restoration area that will likely have pockets of poor soils and for which compaction may be uneven and differential settling is almost certain. Spillways will vary from 15 ft long to 500 ft long. The spillways will also support pedestrian traffic and occasional maintenance/vehicular traffic on a nature trail.

Preliminary Design Needed By

ASAP

Projected Bid Date

Summer 2023

Planned Construction Startup

Summer 2023

Units of measure for this section

Standard

What is the channel type?

Spillway/Chute

GEOWEB Location?

Full Channel

Base Width

Side Slope

4:1

Length

Channel Depth

5 feet

Depth of Flow

2-3 feet

Manning's "n" not critical

Velocity

2-10 ft/sec

Discharge Q

1500 cfs max (many will be much lower)

Bed Slope % flat over spillway then 4:1 down the slope

Flow Type

Intermittent

Wave Action/Wave Height

N/A

Ice Action

No

Groundwater Seepage

No

Native Soil Geotextile (Non-Woven)

Choose GEOWEB infill type:

Concrete

Angle of Internal Friction

Unknown, native Florida sandy clay soils

Cohesion

Unknown

Unit Weight

Unknown

What GEOWEB infill is desired?

Concrete

Project Application - Hidden

Channel Protection System

RFPE