surface ater management engineering eport for new

W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx

1075 CENTRAL AVE

SURFACE WATER MANAGEMENT ENGINEERING REPORT FOR: NEW INDIVIDUAL ERP

MARCH 2014

PREPARED FOR:

BALDRIDGE PROPERTIES, LLC 1507 Astra Way

St. Louis, MO 63010-1146

AND

SOUTH FLORIDA WATER MANAGEMENT DISTRICT 2301 MCGREGOR BLVD FT. MYERS, FL 33901

PREPARED BY:

23150 FASHION DRIVE, SUITE 242 ESTERO, FLORIDA 33928

______________________ MICHAEL T. HERRERA, P.E.

FLORIDA LICENSE NO. 60110

1075 Central Avenue Surface Water Management Engineering Report January 2013

W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx

TABLE OF CONTENTS

1.0 PROJECT SUMMARY _____________________________________________________ 1

2.0 TECHNICAL OVERVIEW ___________________________________________________ 2

2.1 SITE DESCRIPTION, EXISTING CONDITIONS, AND PERMITTING HISTORY ________________ 2

2.2 GENERAL PROJECT DESCRIPTION ________________________________________________ 2

2.3 SURFACE WATER MANAGEMENT SUMMARY ______________________________________ 2

3.0 SURFACE WATER MANAGEMENT DESIGN ____________________________________ 3

3.1 SEASONAL HIGH WATER TABLE _________________________________________________ 3

3.2 TAILWATER CONDITION _______________________________________________________ 3

3.3 ALLOWABLE DISCHARGE ______________________________________________________ 3

3.4 WATER QUALITY (NUTRIENT LOADING AND DISCHARGE ANALYSIS) ___________________ 4

3.5 WATER QUALITY (SFWMD) ____________________________________________________ 4

3.6 FINISHED FLOOR ELEVATION ___________________________________________________ 5

4.0 ICPR MODELING AND DESIGN ______________________________________________ 6

4.1 ICPR MODEL NARRATIVE ______________________________________________________ 6

4.2 ICPR INPUT CALCULATIONS ____________________________________________________ 6

4.3 ICPR RESULTS SUMMARY ______________________________________________________ 7

5.0 EXHIBITS _______________________________________________________________ A

5.1 Exhibit A Nutrient Loading and Discharge Analysis _________________________________ A

5.2 Exhibit B Dry Retention Area Recovery Analysis ____________________________________ B

5.3 Exhibit C ICPR Modeling Input and Result Reports __________________________________ C

5.4 Exhibit D StormTech Subsurface Stormwater Management __________________________ D

5.5 Exhibit E Additional BMP’s _____________________________________________________ E

5.6 Exhibit F City On Naples Email __________________________________________________ F


W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx Page 1

1.0 PROJECT SUMMARY

EXISTING SITE: 1075 Central Ave is the former site of the Naples Daily News (NDN). The NDN site did not contain a surface water management system, was not permitted by the South Florida Water Management District, and does not adhere to current regulatory surface water management design criterion, specifically water quality. The NDN project collected and discharged untreated surface runoff into the City of Naples Central Avenue storm drain system. The City’s Central Avenue storm drain system discharges directly into the Gordon River. The City’s Central Ave system is tidally controlled. Furthermore, the un-attenuated discharge contributes to the existing deficiency of the Central Ave stormwater system. PROPOSED SITE: The proposed 1075 Central Ave project will meet state and federal surface water management design criterion, including general water quality, nutrient loading, attenuation, and discharge rate. The proposed surface water management system is comprised of rain gardens, catch basins, stormdrain pipes, an underground exfiltration/retention system, and a control structure. The proposed site plan naturally reduces the nutrient loading by 34.3%. With the implementation of the underground exfiltration/retention systems the reduced nutrient loading efficiency is increased to 96% (by comparison, 0% is required based upon the Harvey-Harper Analysis) The proposed project will also redirect discharge from the Central Avenue storm drain system to the City of Naples stormwater pump station system. Discharge from the system is subject to further water quality treatment via discharge to a filter marsh. SUMMARY: The proposed stormwater management system will:

Provide 2.42 ac-ft of water quality, which will result in a nutrient loading reduction of 96%.

Redirect stormwater flow from the Central Avenue storm drain system, reducing the existing conveyance deficiency in that system

Redirect stormwater flow from a tidally controlled discharge

Eliminate the discharge of stormwater directly to the Gordon River by discharge into the City of Naples filter marsh via the City of Naples stormwater pump station

Surpass all regulatory surface water management design criterion The following sections contain the supporting technical data. Though not required by a regulatory agency, we have included the University of Central Florida Stormwater BMP Treatment Trans Analysis for nutrient loading comparisons, which closely corresponds to the Harvey-Harper Analysis.



2.0 TECHNICAL OVERVIEW

2.1 SITE DESCRIPTION, EXISTING CONDITIONS, AND PERMITTING HISTORY

1075 Central Avenue project site is located in the City of Naples, Collier County, Florida, within Section 3, Township 50 South, Range 25 East, and is situated at the northwest corner of the intersection of Central Ave and 12

st North. The Site is 8.80 acres, Folio No. 13560000029. A

Boundary and Topographic Survey of the site is included.

The project is currently undeveloped and cleared. No existing environmental resource permits were found for the areas to be developed. Sheet flow runoff from the site is collected along Central Avenue and 12

st North right-of-way where it is conveyed to the Gordon River. The

existing City of Naples right-of-way stormdrain system has a tidal downstream control, has limited capacity, and Central Avenue experiences flooding. The Naples Daily News site did not contain an onsite surface water management system to provide water quality treatment.

2.2 GENERAL PROJECT DESCRIPTION

This application proposes to develop the parcel of land into a mixed use development with access along the existing right-of-way easements.

Water management will consist of overland flow, rain gardens, BMB’s (including catch basin inserts) and storm sewer infrastructure, which conveys stormwater to the underground exfiltration/dry retention system. Dry retention was chosen for the system to satisfy water quality requirements and due to the limited space available to adhere to minimum dimensional criteria for wet detention/retention systems. In addition a dry retention system is the best treatment scenario available, as the majority of the typical rainfall we see in Southwest Florida will stay on the site and percolate rather than discharging offsite. Most importantly the projects’ outfall will be redirected northerly to the City of Naples stormwater pump station, which will then discharge into a filter marsh prior to discharging into the Gordon River.

All design calculations and plans for this application (as prepared by J.R. Evans, Engineering) reference NAVD-88 datum.

2.3 SURFACE WATER MANAGEMENT SUMMARY

The 1075 Central Avenue project will improve the water quality and conveyance of the existing system.

Water Quality: The project will provide the water treatment volume required by the regulatory agencies

Pre-Development 0.00 ac-ft of water quality Post-Development 2.42 ac-ft of water quality (includes 2.5% impervious and OFW criterion)

Nutrient Loading: The post development will reduce the nutrient loading discharge from the predevelopment.

Pre-Development 30.00(Nitrogen) 4.50 (Phosphorus) Post- Development 15.3(Nitrogen) 2.32 (Phosphorus)



3.0 SURFACE WATER MANAGEMENT DESIGN

3.1 SEASONAL HIGH WATER TABLE

A project in close proximity (Naples Square) to the 1075 Central Ave project is permitted/under review with a Seasonal High Water Table (SHWT) of 1.7 ft-NAVD):.

The project existing average grade is +/- 4.15 NAVD. The USGS Soils Maps indicates the SHWT at 2 to 3 ft below existing grade.

Due to the proximity and similar existing site conditions of the proposed project, we have estimated the SHWT for the project to be 1.7 ft-NAVD.

3.2 TAILWATER CONDITION

The tailwater is a fixed stage node, being a stormwater pump station controls the elevation. According to City of Naples the system is dry, see Exhibit C, with a connection tailwater control elevation of -5.0 NAVD. To be conservative its assumed groundwater will eventually infiltrate the stormdrain system and reach equilibrium at the wet season water table of 1.7 ft-NAVD. Therefore, the system will utilize a downstream control of 1.7-ft NAVD.

3.3 ALLOWABLE DISCHARGE

The existing condition is based on the previously constructed Naples Daily News Site. Historical aerials were utilized to determine the land use summary. The allowable discharge is based on pre vs post analysis.

Area (ac) % of Basin

Total Site 8.80

Basin Area 8.80 100.0%

Impervious Area

Buildings 2.65 30%

Pavement/Sidewalks/Curb/etc 2.57 29%

Water Management 0.00 0%

Pervious 3.58 41%

Existing Land Use Summary

Directly Connected Impervious Area

DCIA = Impervious Area / Project Area

DCIA = 5.22/8.8

DCIA = 59.3%

Curve Number

Description Acearage CN Notes

Commercial 8.8 80 Table 4-22 Harper 2007



Time of Concentration (tc) = 2 (Total basin area/640)

0.5

= 2 (8.8/640) 0.5

= 0.165 hours

Use tc = 10 mins Existing Runoff Volume ICPR indicates the runoff for the existing site is 347,955 cu-ft or 7.99 ac-ft and with a perimeter (weir) of 2,632 LF the existing discharge rate is 48.67 cfs, see Exhibit C.

3.4 WATER QUALITY (NUTRIENT LOADING AND DISCHARGE ANALYSIS)

A nutrient loading and discharge analysis was performed for the project in conformance with the FDEP Evaluation of Current Stormwater Design Criteria Within the State of Florida - Final Report 2007 prepared by Harvey Harper, Ph.D., P.E. (herein referred to as Harper Report).

The analysis was performed to determine the depth of treatment required to provide nutrient reduction so that post-developed conditions would be less than or equal to pre-developed conditions.

The nutrient loading and discharge analysis is provided as Exhibit A of this report.

Based on analysis results, the post-development system will reduce the nutrient load from the pre-development condition by 96%.

Total N Total P

Pre-Loading (kg/yr) 30.0 4.5

Post-Loading (kg/yr) 15.30 2.32

Actual Removal (%) -96.0% -96.0%

Nutrient Loading Removal Efficiency

3.5 WATER QUALITY (SFWMD)

Per the Basis of Review, the base volumetric requirement for water quality is the greater of 1 inch over the total developed project area or 2.5 inches over the impervious project area. Because dry retention is utilized for the project, a 50% reduction in the base volumetric requirement is allowed. Per Basis of Review, an extra 50% of water quality storage volume requirement is also provided based on discharging into Outstanding Florida Waters (Naples Bay – Class II).

Water quality calculations are as follows:

1 inch Over the Total Project (Basin) Area

Total area to be treated: 8.80 acres onsite

Base required treatment volume: 0.73 acre-ft ( = 1”/12 * 8.80 acres )

50% additional (OFW): 0.37 acre-ft ( = 0..73 * 0.5 )

Total Treatment Volume 1.10 acre-ft

Treatment Volume for Dry Retention 0.55 acre-ft



2.5 inches Over the Impervious Area

Site area for water quality pervious/impervious calculations only: = Total project – (water surface + roof) = 8.80ac - (0.0ac + 2.00ac) = 6.80 ac of site area for water quality pervious/impervious

Impervious area for water quality pervious/impervious calculations only: = (Site area for water quality pervious/impervious) – pervious. = 6.8 ac – 2.81 ac = 3.99 ac Percentage of imperviousness for water quality: = (Impervious area for water quality/Site area for water quality) * 100 = (3.99 ac / 6.80 ac) * 100 = 58.7 % impervious For 2.5 inches times the percentage impervious: = 2.5” * 0.587 = 1.47” to be treated Compute the volume required for water quality detention: = inches to be treated * (total site – water management) = 1.47” * (8.8 ac – 0.0 ac) * (

1’/12”)

= 1.08 ac-ft. Base required treatment volume: 1.08 acre-ft

50% additional (OFW): 0.54 acre-ft ( = 1.08 * 0.5 )

Total Treatment Volume 1.62 acre-ft

Treatment Volume for Dry Retention 0.81 acre-ft The Harvey-Harper Nutrient Loading design criterion indicates 2.42 ac-ft of water quality. Therefore, the project will retain 2.42 ac-ft. Rain gardens (dry retention), 0.46 acres with 2” storage depth, reduce the underground treatment volume by 0.08 ac-ft to 2.34 ac-ft. Therefore, a minimum of 2.34 ac-ft of treatment shall be provided based on the Harvey Harper This storage volume will be obtained in an underground exfiltration system, see Exhibit D. In addition the regulatory water quality standards the project may incorporate additional treatment via BMP’s, see Exhibit E.

3.6 FINISHED FLOOR ELEVATION

The proposed building is located within Flood Zone AE with a BFE of 8.0 NAVD. Per SFWMD guidelines, a 100-yr 3-day Zero-Discharge storm event was modeled in ICPR, which provided a peak stage of 8.17 ft-NAVD. The building is designed with finished floor elevation at or above elevation 8.20 ft-NAVD.



4.0 ICPR MODELING AND DESIGN

4.1 ICPR MODEL NARRATIVE

The project was modeled in ICPR utilizing the 25-year 3-day storm event with a rainfall of 12.0 inches, and the 100-year 3-day (zero discharge) storm event with a rainfall of 14.7 inches, per the rainfall maps provided within the SFWMD Basis of Review - Design Aids.

Stage/storage calculations for the project are provided in the following section.

The average infiltration rate was determined based on results of the recovery analysis (please see Exhibit B), and was calculated by dividing the total volume recovered (105,415.2 cf) by the total recovery time (1.71 days). The calculation provides an average infiltration rate of 0.71 cfs. This value was entered into an operating table within ICPR to model infiltration/percolation. This method is consistent with ICPR Modeling Tips provided on the website of the program’s manufacturer, Streamline Technologies.

4.2 ICPR INPUT CALCULATIONS

Area (ac) % of Basin

Total Site 8.80

Basin Area 8.80 100.0%

Impervious Area

Buildings 2.00 23%

Pavement/Sidewalks/Curb/etc 3.99 45%

Water Management 0.00 0%

Pervious 2.81 32%

Land Use Summary

Directly Connected Impervious Area

DCIA = Impervious Area / Project Area

DCIA = 3.99/8.80

DCIA = 45.3%

Curve Number

Description Acearage CN Notes

Commercial 8.8 80 Table 4-22 Harper 2007

Time of Concentration (tc) = 2 (Total basin area/640)

0.5

= 2 (8.8/640) 0.5

= 0.165 hours Use tc = 10 mins

Stage vs. Storage

The underground dry retention bottom, 2.7 NAVD, and top, 5.03 NAVD, are shown within the plan set will provide 105,415.20 cu-ft (2.42 ac-ft) of storage. The remaining Open Space and



Development Areas are assumed to be linear between elevations 6.3 and 8.0. Notice the Open Space and Development Areas match the Land Use Breakdown.

2.7 5.03 5.3 6.3 7 8

Basin Land Use Areas

Open Space 0.00 0.00 0.00 0.00 0.97 2.36

Development Area 0.00 0.00 0.00 0.00 2.09 4.44

Parcel Total (ac) 0.00 0.00 0.00 0.00 3.06 6.80

Incremental Storage (ac-ft) 0.00 2.42 0.00 0.00 1.07 4.93

Cumulative Storage (ac-ft) 0.00 2.42 2.42 2.42 3.49 8.42

Stage (Ft, NAVD)

Storage Area (ac) Available at Stage

Storage Volume (Ac-ft) Available at stage

4.3 ICPR RESULTS SUMMARY

Note:

1. Per FEMA FIRM Map 12021C0393H the subject site is located within Flood Zone AE (8.0). Site is allowed to discharge offsite once elevation 5.03 NAVD is breached.

ICPR Modeling Input and Result Reports are provided as Exhibit C.

25 YEAR, 3 DAY RAINFALL (in) 12.0

25 YEAR, 3 DAY PEAK STAGE (ft, NAVD) 6.63

100 YEAR, 3 DAY RAINFALL (in) 14.7

100 YEAR, 3 DAY PEAK STAGE (ft, NAVD) 8.17

25 YEAR, 3 DAY ALLOWABLE DISCHARGE (cfs) 48.67

25 YEAR, 3 DAY PEAK DISCHARGE (cfs) 19.20

MIN. PERIMTER BERM ELEVATION (ft, NAVD)1 6.70

RECOMMENDED MIN. FF ELEV. (ft, NAVD) 8.20


W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx EXHIBIT A

5.0 EXHIBITS

5.1 Exhibit A Nutrient Loading and Discharge Analysis

Estero, FL 33928

1075 Central Avenue

Nutrient Loading and Discharge Analysis

Prepared For:

Baldridge Properties, LLC

Prepared By:

1507 Astra Way

St. Louis, MO 63010-1146

January 2014

and

South Florida Water Management District

2301 McGregor Blvd

Ft. Myers, FL 33901

23150 Fashion Drive, Suite 242

PRE-DEVELOPMENT CONDITIONS

1. Land Use for Naples Daily News Site

8.80 acres Low Intensity Commercial

8.80 acres TOTAL

2. Ground Cover Soil Types

(HSG) D (Urban) Boca/Myakka/Hallanale/Immokalee

3. Impervious Areas:

Low Intensity Commercial 8.80 acres

Impervious: 5.22 Acres = 59.3%

Directly Connected Impervious Area: 5.22 Acres = 59.3%

4. Non-DCIA Curve Number:

Low Intensity Commercial

Curve Number for Pervious Areas, Commercial, (HSG) D = 80 Table 4-22 Harper 2007

Pervious Area = 3.58 Acres

Curve Number for Impervious Areas = 98 General Assumption

Impervious Area which is not DCIA = 0.00 Acres

Non-DCIA Curve Number = 80.0

5. Annual Runoff Volume:

From Appendix C, Zone 4, the annual runoff coefficient for:

Low Intensity Commercial DCIA = 59.3%, CN = 80. = 0.541

Annual Runoff Volume (Area x Rainfall x Runoff C):


Area 8.80 acres

Rainfall 51.9 in/yr from Appendix A-3, Harper 2007

Runoff Coefficient 0.541

Total Runoff Volume= 20.6 ac-ft/yr

6. Post-Development Loading:

A. Total Nitrogen:

Low Intensity Commercial Total N Concentration = 1.18 mg/l from Table 4-17

Total Annual TN Loading = 30.0 kg TN/yr

B. Total Phosphorus:

Low Intensity Commercial Total P Concentration = 0.179 mg/l from Table 4-17

Total Annual TP Loading = 4.5 kg TP/yr

Pre-Development

POST-DEVELOPMENT CONDITIONS

1. Land Use for 1075 Central Avenue (Mixed Use)

6.80 acres Low Intensity Commercial

2.00 acres

8.80 acres TOTAL

2. Ground Cover Soil Types

(HSG) D (Urban) Boca/Myakka/Hallanale/Immokalee

3. Impervious Areas:

Low Intensity Commercial 6.80 acres

Impervious: 3.99 Acres = 58.7%

Directly Connected Impervious Area: 3.99 Acres = 58.7%

4. Non-DCIA Curve Number:


Curve Number for Pervious Areas, Commercial, (HSG) D = 80 Table 4-22 Harper 2007

Pervious Area = 2.81 Acres

Curve Number for Impervious Areas = 98 General Assumption

Impervious Area which is not DCIA = 0.00 Acres

Non-DCIA Curve Number = 80.0

5. Annual Runoff Volume:

From Appendix C, Zone 4, the annual runoff coefficient for:

Low Intensity Commercial DCIA = 58.7%, CN = 80. = 0.521

Annual Runoff Volume (Area x Rainfall x Runoff C):


Area 6.80 acres

Rainfall 51.9 in/yr from Appendix A-3, Harper 2007

Runoff Coefficient 0.521

Total Runoff Volume= 15.3 ac-ft/yr

6. Post-Development Loading:

A. Total Nitrogen:

Low Intensity Commercial Total N Concentration = 1.18 mg/l from Table 4-17

Total Annual TN Loading = 22.3 kg TN/yr

B. Total Phosphorus:

Low Intensity Commercial Total P Concentration = 0.179 mg/l from Table 4-17

Total Annual TP Loading = 3.4 kg TP/yr

Roof flow directly connected to exfiltration/retention system, does not

contribute to nutrient loading

Post-Development

REQUIRED DRY DETENTION

1. Required Removal Efficiencies:

Total N Total P



Required Removal (%) -34.3% -34.3%

Additional Removal 96.0%

Total N Total P



Actual Removal (%) -96.0% -96.0%

2. Dry Retention Depth to Achieve Efficiencies:

DCIA % = 58.7%

NDCIA CN = 80.0

Excerpt from:

Mean Annual Mass Removal Efficiencies for 3.25-inches of Retention for Zone 4

55% 60%

80 95.9% 95.9%

85 95.5% 95.4%

Interpolating for CN of 80.:

55% 60%

80.0 95.9% 95.9%

Interpolating for DCIA of 58.7%:

Removal Efficiency = 95.9%

(continued on next page)

Loading removal not required as Post-Loading is less than Pre-Loading. However, the

project requires retention based on Basis of Review water quality requirements. The

retention, further reduces the Post-Loading to 83.2%

Reference Appendix D, "Calculated Performance Efficiency of Dry Retention as a

Function of DCIA and Non-DCIA Curve Number"

NDCIA CN% DCIA

NDCIA CN% DCIA

Excerpt from:

Mean Annual Mass Removal Efficiencies for 3.25-inches of Retention for Zone 4

55% 60%

80 96.5% 96.4%

85 96.1% 96.1%

Interpolating for CN of 80.:

55% 60%

80.0 96.5% 96.4%

Interpolating for DCIA of 58.7%:

Removal Efficiency = 96.4%

3. Dry Detention Depth Result:

Required Depth = 3.30 inches

4. Required Treatment Volume Summary:

Site Area to be Treated = 8.80 AC

Volume of Treatment Required = 2.42 AC-FT

= 105,335 CF

5. Summary:

In the pre-development analysis (Naples Daily News Site) the building roof area is considered DCIA, as

the roofs discharged directly onto pavement. The Naples Daily News site did not contain a surface

water management system. In post-development analysis the roof will be connected directly into the

underground retention system as clean water and therefore is not included within the nutrient loading

computations. The development of this project will improve the nutrient loading discharge and

therefore does not require any additional treatment volume besides what is specified within the

SFWMD Basis of Review.

NDCIA CN% DCIA

NDCIA CN% DCIA

To determine required depth for a removal efficiency of 96.%, interpolate

between 3.25 inches for 95.9% and 3.50 inches for 96.4%.


W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx EXHIBIT B

5.2 Exhibit B Dry Retention Area Recovery Analysis

GENERAL PARAMETERS

Pond Bottom Elevation = 2.7 ft-NAVD

Pond Top Elevation = 5.03 ft-NAVD

Ab (pond bottom area) = 12,668 SF

Assumed Length/Width Ratio = 7.2

W (averaged bottom width) = 83.0 ft

Top Area (@ 5.03) = 12,668 SF

Approximate Treatment Volume = 105,415 CF

SHWT (seasonal high water table) = 1.7 ft-NAVD

Aquifer Bottom Elevation = -28 ft-NAVD

hv (treatment volume depth) = 2.33 ft-NAVD

KH (horizontal saturated hydraulic conductivity) = 10 ft/day 5 in/hr

Kvu (vertical unsaturated hydraulic conductivity) = 4 ft/day 2.2 in/hr

f (effective storage above SHWT) = 0.3

CALCULATIONS

Id (design infiltration rate) = Kvu / 2 2.2222 ft/day

hb (difference between SHWT and pond bottom) = 1 ft

∆tsat (vertical unsaturated infiltration time) = f * hb / Id 0.13500135 days

Vu (infil. volume during vertical unsaturated infil.) = f * Ab * hb 3800.4 CF

hc (height of water above SHWT at recovery) = hb 1 ft

hu (height of water to saturate soil) = f * hb 0.3 ft

Remaining volume after vertical unsaturated infil. = Orig. Volume - Vu 101615 CF

Interpolate Retention Area Parameters for water elevation after vertical unsaturated infiltration

Retention Area Parameters:

Water Elevation (ft-NAVD) Area (SF) Storage Volume (CF)

2.7 12668 0

5.03 12668 105415

Interpolation:

Remaining Volume (CF) Elevation (ft-NAVD) Area (SF)

101615 4.9 12668

Elevation of water after vertical unsaturated infil. = 4.9 ft-NAVD

h2 (height of water in pond at start of saturated lateral flow) = 2.2 ft

HT (height of water above SHWT at start of saturated lateral flow) = 3.2 ft

Fy = hc / HT 0.31

Fx (from Dimensionless Curves) 1.90

H (initial saturated thickness) = SHWT - acquifer bottom elevation 29.7 ft

D (average saturated thickness) = H + hc / 2 30.2 ft

W (average pond width, assuming average length/width ratio of 2)

t (time to recover remaining treatment volume) = W2 / (4*KH*D*Fx2) 1.58 days

ttotal (total recovery time) = ∆tsat + t 1.71 days

1075 Central - RETENTION AREA RECOVERY ANALYSIS


W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx EXHIBIT C

5.3 Exhibit C ICPR Modeling Input and Result Reports


W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx EXHIBIT D

5.4 Exhibit D StormTech Subsurface Stormwater Management

SC-310

DC-780

MC-3500

SC-740

Product Catalog

MC-4500

(Not intended for design layouts, refer to the appropriate “StormTechDesign Manual” for specific chamber design information.)

StormTech Subsurface Stormwater Management

2 Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com

Our Chambers Provide...

• Large capacity that fits very tight footprintsproviding developers with more useable land fordevelopment.

• A proven attenuation alternative to cumbersome large diameter metal pipe or snap together plastic crates and unreliable multi-layer systems.

• Provides the strength of concrete vaults at a verycompetitive price.

• The robust continuous true elliptical arch designwhich effectively transfers loads to the surrounding backfill providing the long-term safety factor requiredby AASHTO. Offers developers a cost-effective underground system that will perform as designed for decades.

• Designed in accordance with the AASHTO LRFDBridge Design Specifications providing engineers with a structural performance standard for live and long-term dead loads.

• Polypropylene and polyethylene resins tested usingASTM standards to ensure long and short-term structural properties.

• Injection molded for uniform wall thickness and repeatable quality.

• Third party tested and patented Isolator Row forless frequent maintenance, water quality and long-term performance.

• Incorporates traditional manifold/header designsusing conventional hydraulic equations that can easily verify flow equalization and scour velocity.

• Open chamber design requiring only one chambermodel to construct each row assuring ease of construction and no repeating end walls toobstruct access or flow.

StormTech has thousands of chamber systems in servicethroughout the world. All StormTech chambers are de -signed to meet the most stringent industry performancestandards for superior structural integrity. The StormTechsystem is designed primarily to be used under parkinglots, roadways and heavy earth loads saving valuable landand protecting water resources for commercial and munic-ipal applications. In our continuing desire to answerdesigners’ challenges, StormTech has expanded the familyof products providing engineers, developers, regulatorsand contractors with additional site specific flexibility.

Advanced Structural Performance forGreater Long-Term Reliability

StormTech developed a state of the art chamberdesign through:

• Collaboration with world-renowned experts of burieddrainage structures to develop and evaluate the struc-tural testing program and product design

• Designing chambers to exceed American Association ofState Highway and Transportation Officials (AASHTO)LRFD design speci fications for HS-20 live loads anddeep burial earth loads

• Subjecting the chambers to rigorous full scale testing,under severe loading conditions to verify the AASHTOsafety factors for live load and deep burial applications

• Designing chambers to conform to the requirementsof ASTM F2418 (polypropylene chambers) and ASTMF2922 (polyethylene chambers) and design require-ments of ASTM F2787 ensuring both the assur ance ofproduct quality and safe structural design

Table of ContentsSpecifications and Product Comparison.......................3LEED® Credits ...............................................................4SC-310 Specification ....................................................5SC-310-3 ......................................................................7SC-740..........................................................................9DC-780........................................................................11MC-3500.....................................................................13MC-4500.....................................................................15Isolator® Row .............................................................17Products and Services ................................................19

StormTech offers a variety of chamber sizes (SC-310, SC-740, DC-780, MC-3500 and MC-4500)so the consulting design engineer can choose the chamber that is best suited for the site conditionsand regulatory requirements. StormTech has thou-sands of chamber systems in service worldwide. We provide plan layout and cost estimate services atno charge for consulting engineers and developers.

SC-310

SC-740

MC-3500

MC-4500

MC-3500

40% REDUCTION 40% REDUCTION 20% REDUCTION

Example: Footprint Comparison – 100,000 CF Project

Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com 3

StormTech Subsurface Stormwater Management

SC-310 SC-740 DC-780 MC-3500 MC-4500Height, in. (mm) 16 (406) 30 (762) 30 (762) 45 (1143) 60 (1524)

Width, in. (mm) 34 (864) 51 (1295) 51 (1295) 77 (1956) 100 (2540)

Length, in. (mm) 90.7 (2300) 90.7 (2300) 90.7 (2300) 90 (2286) 52 (1321)

Installed Length, in. (mm) 85.4 (2170) 85.4 (2170) 85.4 (2170) 86.0 (2184) 48.3 (1227)

Bare Chamber Storage, cf (cm) 14.7 (0.42) 45.9 (1.30) 46.2 (1.30) 109.9 (3.11) 106.5 (3.01)

Stone above, in. (mm) 6 (152) 6 (152) 6 (152) 12 (305) 12 (305)

Stone below, in. (mm) 6 (152) 6 (152) 9 (229) 9 (229) 9 (229)

Row Spacing, in. (mm) 6 (152) 6 (152) 6 (152) 9 (229) 9 (229)

Minimum Installed Storage, cf (cm) 31.0 (0.88) 74.9 (2.12) 78.4 (2.22) 178.9 (5.06) 162.6 (4.60)

Storage Per Unit Area, cf/sf (cm/sm) 1.31 (0.39) 2.21 (0.67) 2.32 (0.70) 3.48 (1.06) 4.45 (1.35)

PRODUCT SPECIFICATIONS

NOTE: Spec sheets for our RC-310and RC-750, recycled chambers, are available upon request.

StormTech and LEED

List of LEED Credits that StormTech may contribute towards:

SUSTAINABLE SITES

• SS Credit 5.1 - Site Development: Protect or Restore HabitatUtilizing StormTech System beneath roadways, surface parking, walkways, etc. may reduce overall site disturbance

• SS Credit 5.2 - Site Development: Maximize Open SpaceUtilizing StormTech System can increase overall open space and may reduce overall site disturbance

• SS Credit 6.1 - Stormwater Design: Quantity ControlDesign StormTech System per local or LEED stormwater quantity requirements, whichever is more stringent

• SS Credit 6.2 - Stormwater Design: Quality ControlUse of Isolator Row provides sediment removal, and can also promote infiltration and groundwaterrecharge

• SS Credit 7.1 - Heat Island Effect: Non-RoofUse of StormTech System may eliminate need for above ground detention ponds, thus reducing thermal impacts of stormwater runoff

Water Efficiency

• WE Credit 1 - Water Efficient LandscapingUtilize StormTech System to store captured rainwater for landscape irrigation

• WE Credit 2 - Innovative Wastewater TechnologiesUtilize StormTech System to store captured rainwater to reduce potable water demand.

• WE Credit 3 - Water Use ReductionUtilize StormTech System to store captured rainwater and allow reuse for non-potable applications

Materials and Resources

• MR Credit 4 – Recycled ContentUtilize recycled concrete as the backfill material for the StormTech System.

• MR Credit 5 – Regional MaterialsStone backfill material for the StormTech System will apply if extracted within 500 miles of project site.

Innovation & Design

• ID Credit 1 – Innovation in DesignUtilize StormTech System to substantially exceed a performance credit



Designed to meet the most stringent industry performancestandards for superior structural integrity while providingdesigners with a cost-effective method to save valuableland and protect water resources. The StormTech systemis designed primarily to be used under parking lots thus maximizing land usage for commercial and municipal applications.

90.7" (2300 mm)

34.0" (864 mm)

6"

(150 mm)

12" (305 mm)

DIA. MAX

85.4" (2170 mm) INSTALLED

ACCEPTS 4" (100 mm)

SCH 40 PIPE FOR OPTIONAL

INSPECTION PORT

16.0"

(406 mm)

SC-310 End CapSC-310 Chamber

StormTech SC-310 Chamber

SC-310 Chamber

StormTech SC-310 Chamber (not to scale)

Nominal Chamber Specifications

Size (L x W x H) 85.4" x 34.0" x 16.0" (2170 x 864 x 406 mm)

Chamber Storage 14.7 ft3 (0.42 m3)

Min. Installed Storage* 31.0 ft3 (0.88 m3)

Weight 37.0 lbs (16.8 kg)

Shipping

41 chambers/pallet

108 end caps/pallet

19 pallets/truck

*Assumes 6" (152 mm) stone above, below and between chambers and40% stone porosity.

ADS 601T NON-WOVEN GEOTEXTILE(OR EQUAL) ALL AROUND CLEAN, CRUSHED,

ANGULAR STONE

CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITHASTM F2787 “STANDARD PRACTICE FOR STRUCTURALDESIGN OF THERMOPLASTIC CORRUGATED WALLSTORMWATER COLLECTION CHAMBERS.”

CHAMBERS SHALL MEET THE REQUIREMENTS OF ASTM F2922 (POLYETHYLENE CHAMBERS)

OR ASTM F2418 (POLYPROPYLENE CHAMBERS)

NOMINAL 3/4" - 2" (19 mm - 51 mm)CLEAN, CRUSHED, ANGULAR STONE

(AASHTO M43 #3 THROUGH #57 STONE SIZES ALLOWED)

StormTech SC-310 Chamber


Amount of Stone Per Chamber

Note: Assumes 6" (152 mm) of row separation and 18" (457 mm)of cover. The volume of excavation will vary as the depth of thecover increases.

Volume of Excavation Per Chamber yd3 (m3)

Stone Foundation Depth6" (152 mm) 12" (305 mm) 18" (457 mm)

StormTech SC-310 2.9 (2.2) 3.4 (2.6) 3.8 (2.9)

Note: Assumes 6" (152 mm) of stone above chambers, 6” (152 mm)row spacing and 40% stone porosity.

Storage Volume Per Chamber ft3 (m3)

Bare Chamber and StoneChamber Stone Foundation DepthStorage in. (mm)

ft3 (m3) 6 (152) 12 (305) 18 (457)

StormTech SC-310 14.7 (0.4) 31.0 (0.9) 35.7 (1.0) 40.4 (1.1)

Note: Assumes 6" (152 mm) of stone above, and between chambers.

Stone Foundation Depth

ENGLISH TONS (yds3) 6" 12" 18"

StormTech SC-310 2.1 (1.5 yd3) 2.7 (1.9 yd3) 3.4 (2.4 yd3)

METRIC KILOGRAMS (m3) 152 mm 305 mm 457 mmStormTech SC-310 1830 (1.1 m3) 2490 (1.5 m3) 2990 (1.8 m3)

SC-310 Cumulative Storage Volumes Per ChamberAssumes 40% Stone Porosity. Calculations are BasedUpon a 6" (152 mm) Stone Base Under the Chambers.

28 (711) 14.70 (0.416) 31.00 (0.878)27 (686) 14.70 (0.416) 30.21 (0.855)26 (680) 14.70 (0.416) 29.42 (0.833)25 (610) 14.70 (0.416) 28.63 (0.811)24 (609) 14.70 (0.416) 27.84 (0.788)23 (584) 14.70 (0.416) 27.05 (0.766)22 (559) 14.70 (0.416) 26.26 (0.748)21 (533) 14.64 (0.415) 25.43 (0.720)20 (508) 14.49 (0.410) 24.54 (0.695)19 (483) 14.22 (0.403) 23.58 (0.668)18 (457) 13.68 (0.387) 22.47 (0.636)17 (432) 12.99 (0.368) 21.25 (0.602)16 (406) 12.17 (0.345) 19.97 (0.566)15 (381) 11.25 (0.319) 18.62 (0.528)14 (356) 10.23 (0.290) 17.22 (0.488)13 (330) 9.15 (0.260) 15.78 (0.447)12 (305) 7.99 (0.227) 14.29 (0.425)11 (279) 6.78 (0.192) 12.77 (0.362)10 (254) 5.51 (0.156) 11.22 (0.318)9 (229) 4.19 (0.119) 9.64 (0.278)8 (203) 2.83 (0.081) 8.03 (0.227)7 (178) 1.43 (0.041) 6.40 (0.181)6 (152) 0 4.74 (0.134)5 (127) 0 3.95 (0.112)4 (102) 0 3.16 (0.090)3 (76) 0 2.37 (0.067)2 (51) 0 1.58 (0.046)1 (25) 0 0.79 (0.022)

Depth of Water Cumulative Total System in System Chamber Storage Cumulative Storage

Inches (mm) ft3 (m3) ft3 (m3)

StoneCover

Stone Foundation

Note: Add 0.79 cu. ft. (0.022 m 3) of storage for each additionalinch (25 mm) of stone foundation.

StormTech SC-310-3 Chamber


The proven strength and durability of the SC-310-3Chamber allows for a design option for sites where limited cover, limited space, high water table and escalated aggregate cost are a factor. The SC-310-3 has a minimum cover requirement of 16" (406 mm) to bottom of pavement and reduces the spacing requirement between chambers by 50% to 3" (76 mm).This provides a reduced footprint overall and allows the designer to offer a traffic bearing application yetcomply with water table separation regulations.

ADS 601T NON-WOVEN GEOTEXTILE (OR EQUAL). ALL AROUND CLEAN, CRUSHED, ANGULAR STONE

CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITH ASTM F2787 “STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS.”

CHAMBERS SHALL MEET THE REQUIREMENTSOF ASTM F2922 (POLYETHYLENE CHAMBERS)

OR ASTM F2418 (POLYPROPYLENE CHAMBERSNOMINAL 3/4" - 2" (19 mm - 51 mm)

CLEAN, CRUSHED, ANGULAR STONE(AASHTO M43 #3 THROUGH #57 STONE SIZES ALLOWED)

SC-310 END CAP

Typical Cross Section Detail

SC-310-3 Chamber

StormTech SC-310-3 Chamber (not to scale)

Nominal Chamber Specifications

Size (L x W x H) 85.4" x 34.0" x 16.0" (2170 x 864 x 406 mm)

Chamber Storage 14.7 ft3 (0.42 m3)

Min. Installed Storage* 29.3 ft3 (0.83 m3)

Weight 37.0 lbs (16.8 kg)

Shipping

41 chambers/pallet

108 end caps/pallet

19 pallets/truck

90.7" (2300 mm)

34.0" (864 mm)

6"

(150 mm)

12" (305 mm)

DIA. MAX

85.4" (2170 mm) INSTALLED

ACCEPTS 4" (100 mm)

SCH 40 PIPE FOR OPTIONAL

INSPECTION PORT

16.0"

(406 mm)

SC-310 End Cap

SC-310 Chamber

*Assumes 6" (152 mm) stone above and below chambers, 3" (76 mm) row spacing and 40% stone porosity.

StormTech SC-310-3 Chamber


Amount of Stone Per Chamber

Note: Assumes 3" (76 mm) of row separation, 6" (152 mm) of stoneabove the chambers and 16" (406 mm) of cover. The volume of excavation will vary as depth of cover increases.

Volume of Excavation Per Chamber yd3 (m3)

Stone Foundation Depth6" (152) 12" (305) 18" (457)

SC-310-3 2.6 (2.0) 3.0 (2.3) 3.4 (2.6)

Note: Assumes 6" (152 mm) of stone above chambers, 3" (76 mm)row spacing and 40% stone porosity.

Storage Volume per Chamber ft3 (m3)

Note: Assumes 6" (152 mm) of stone above chambers and 3" (76 mm)row spacing.

Stone Foundation Depth

ENGLISH TONS (yd3) 6" 12" 18"

SC-310-3 1.9 (1.4) 2.5 (1.8) 3.1 (2.2)

METRIC KILOGRAMS (m3) 152 mm 305 mm 457 mmSC-310-3 1724 (1.0) 2268 (1.3) 2812 (1.7)

SC-310-3 Cumulative Storage Volume Per ChamberAssumes 40% Stone Porosity. Calculations are BasedUpon a 6" (152 mm) Stone Base Under the Chambers.

28 (711) 14.7 (0.416) 29.34 (0.831)27 (686) 14.7 (0.416) 28.60 (0.810)26 (660) 14.7 (0.416) 27.87 (0.789)25 (635) 14.7 (0.416) 27.14 (0.769)24 (610) 14.7 (0.416) 26.41 (0.748)23 (584) 14.7 (0.416) 25.68 (0.727)22 (559) 14.7 (0.416) 24.95 (0.707)21 (533) 14.64 (0.415) 24.18 (0.685)20 (508) 14.49 (0.410) 23.36 (0.661)19 (483) 14.22 (0.403) 22.47 (0.636)18 (457) 13.68 (0.387) 21.41 (0.606)17 (432) 12.99 (0.368) 20.25 (0.573)16 (406) 12.17 (0.345) 19.03 (0.539)15 (381) 11.25 (0.319) 17.74 (0.502)14 (356) 10.23 (0.290) 16.40 (0.464)13 (330) 9.15 (0.260) 15.01 (0.425)12 (305) 7.99 (0.226) 13.59 (0.385)11 (279) 6.78 (0.192) 12.13 (0.343)10 (254) 5.51 (0.156) 10.63 (0.301)9 (229) 4.19 (0.119) 9.11 (0.258)8 (203) 2.83 (0.080) 7.56 (0.214)7 (178) 1.43 (0.040) 5.98 (0.169)6 (152) 0 4.39 (0.124)5 (127) 0 3.66 (0.104)4 (102) 0 2.93 (0.083)3 (76) 0 2.19 (0.062)2 (51) 0 1.46 (0.041)1 (25) 0 0.73 (0.021)

Depth of Water Cumulative Total System in System Chamber Storage Cumulative Storage

Inches (mm) ft3 (m3) ft3 (m3)

StoneCover

Stone Foundation

Note: Add 0.73 ft3 (0.021 m3) of storage for each additional inch(25 mm) of stone foundation.

Minimum Required Bearing Resistance for Service Loads ksf (kPa)Cover 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0ft (m) (144) (139) (134) (129) (124) (120) (115) (110) (105) (101) (96)1.5 6 9 9 9 9 9 12 12 12 15 15

(0.46) (152) (229) (229) (229) (229) (229) (305) (305) (305) (381) (381)2 6 6 9 9 9 9 12 12 12 15 15

(0.61) 152) (152) (229) (229) (229) (229) (305) (305) (305) (381) (381)2.5 6 6 6 6 6 9 9 9 12 12 12

(0.76) (152) (152) (152) (152) (152) (229) (229) (229) (305) (305) (305)3 6 6 6 6 6 6 9 9 9 9 12

(0.91) (152) (152) (152) (152) (152) (152) (229) (229) (229) (229) (305)3.5 6 6 6 6 6 6 6 9 9 9 12

(1.07) (152) (152) (152) (152) (152) (152) (152) (229) (229) (229) (305)4 6 6 6 6 6 6 6 9 9 9 9

(1.22) 152) (152) (152) (152) (152) (152) (152) (229) (229) (229) (229)4.5 6 6 6 6 6 6 6 6 9 9 9

(1.37) 152) (152) (152) (152) (152) (152) (152) (152) (229) (229) (229)5 6 6 6 6 6 6 6 9 9 9 9

(1.52) (152) (152) (152) (152) (152) (152) (152) (229) (229) (229) (229)5.5 6 6 6 6 6 6 6 9 9 9 12

(1.68) (152) (152) (152) (152) (152) (152) (152) (229) (229) (229) (305)6 6 6 6 6 6 6 9 9 9 9 12

(1.83) (152) (152) (152) (152) (152) (152) (229) (229) (229) (229) (305)6.5 6 6 6 6 6 6 9 9 9 12 12

(1.98) (152) (152) (152) (152) (152) (152) (229) (229) (229) (305) (305)7 6 6 6 6 6 9 9 9 9 12 12

(2.13) (152) (152) (152) (152) (152) (229) (229) (229) (229) (305) (305)7.5 6 6 6 6 9 9 9 9 12 12 12

(2.29) (152) (152) (152) (152) (229) (229) (229) (229) (305) (305) (305)8 6 6 6 9 9 9 9 12 12 12 15

(2.44) (152) (152) (152) (229) (229) (229) (229) (305) (305) (305) (381)

NOTE: The design engineer is solely responsible for assessingthe bearing resistance (allowable bearing capacity) of the sub-grade soils and determining the depth of foundation stone.Subgrade bearing resistance should be assessed with consid-eration for the range of soil moisture conditions expectedunder a stormwater system.

Bare Chamber and Stone VolumeChamber Stone Foundation DepthStorage in. (mm)

ft3 (m3) 6 (152) 12 (305) 18 (457)

SC-310-3 14.7 (0.42) 29.3 (0.83) 33.7 (0.95) 38.1 (1.08)

StormTech Isolator®

Row


An important component of any Stormwater PollutionPrevention Plan is inspection and maintenance. TheStormTech Isolator Row is a patent pending technique to inexpensively enhance Total Suspended Solids (TSS)removal and provide easy access for inspection andmaintenance.

The Isolator Row is a row of StormTech chambers that issurrounded with filter fabric and connected to a closelylocated manhole for easy access. The fabric-wrappedchambers pro vide for settling and filtration of sedimentas stormwater rises in the Isolator Row and ultimatelypasses through the filter fabric. The open bottom chambersand perforated sidewalls (SC-310, SC-310-3, and SC-740models) allow stormwater to flow both vertically andhorizon tally out of the chambers. Sediments are cap turedin the Isolator Row, protecting the storage areas of theadjacent stone and chambers from sediment accumulation.

Two different fabrics are used for the Isolator Row. Awoven geotextile fabric is placed between the stone andthe Isolator Row chambers. The tough geo textile pro-vides a media for stormwater filtration and provides adurable surface for maintenance operations. It is alsodesigned to prevent scour of the underlying stone andremain intact during high pressure jetting. A non-wovenfabric is placed over the chambers to provide a filtermedia for flows passing through the perforations in thesidewall of the chamber. The non-woven fabric is notrequired over the DC-780, MC-3500 or MC-4500 modelsas these chambers do not have perforated side walls.

The Isolator Row is typically designed to capture the“first flush” and offers the versatility to be sized on a volume basis or flow rate basis. An upstream manholenot only provides access to the Isolator Row, but typically includes a high flow weir such that stormwaterflow rates or volumes that exceed the capacity of theIsolator Row crest the weir and discharge through amanifold to the other chambers.

The Isolator Row may also be part of a treatment train.By treating stormwater prior to entry into the chambersystem, the service life can be extended and pollutantssuch as hydrocarbons can be captured. Pre-treatmentbest management practices can be as simple as deepsump catch basins and oil-water separators or can beinnovative storm water treatment devices. The design of the treatment train and selection of pretreatment devicesby the design engineer is often driven by regulatoryrequirements. Whether pretreatment is used or not, theIsolator Row is recommended by StormTech as an effec-tive means to minimize maintenance requirements andmaintenance costs.

Note: See the StormTech Design Manual for detailedinformation on designing inlets for a StormTech system,including the Isolator Row.

ECCENTRIC

MANHOLEWITH

OVERFLOWWEIR

STORMTECHISOLATOR ROW

OPTIONAL PRE-TREATMENT

OPTIONAL ACCESS STORMTECH CHAMBERS

StormTech Isolator Row with Overflow Spillway (not to scale)

StormTech Isolator Row

is required, please follow local and OSHA rules for a con-fined space entries.

Maintenance is accomplished with the jetvac process.The jetvac process utilizes a high pressure water nozzleto propel itself down the Isolator Row while scouring andsuspending sediments. As the nozzle is retrieved, thecaptured pollutants are flushed back into the manhole forvacuuming. Most sewer and pipe maintenance compa-nies have vacuum/jetvac combination vehicles. Selectionof an appropriate jetvac nozzle will improve maintenanceefficiency. Fixed nozzles designed for culverts or largediameter pipe cleaning are preferable. Rear facing jetswith an effective spread of at least 45” are best. Most jet-vac reels have 400 feet of hose allowing maintenance ofan Isolator Row up to 50 chambers long. The jetvacprocess shall only be performed on StormTech IsolatorRows that have AASHTO class 1 woven geotextile (asspecified by StormTech) over their angular base stone.

INSPECTIONThe frequency of Inspection and Maintenance varies bylocation. A routine inspection schedule needs to be esta -blished for each individual location based upon site spe-cific variables. The type of land use (i.e. industrial, com-mercial, residential), anticipated pollutant load, percentimperviousness, climate, etc. all play a critical role indetermining the actual frequency of inspection and main-tenance practices.

At a minimum, StormTech recommends annual inspec-tions. Initially, the Isolator Row should be inspected every6 months for the first year of operation. For sub sequentyears, the inspection should be adjusted based upon pre-vious observation of sediment deposition.

The Isolator Row incorporates a combination of standardmanhole(s) and strategically located inspection ports (as needed). The inspection ports allow for easy accessto the system from the surface, eliminating the need toperform a confined space entry for inspection purposes.

If, upon visual inspection it is found that sediment hasaccumulated, a stadia rod should be inserted to determinethe depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length of theIsolator Row, clean-out should be performed.

MAINTENANCEThe Isolator Row was designed to reduce the cost ofperiodic maintenance. By “isolating” sediments to justone row, costs are dramatically reduced by eliminatingthe need to clean out each row of the entire storage bed.If inspection indicates the potential need for maintenance,access is provided via a manhole(s) located on theend(s) of the row for cleanout. If entry into the manhole

SC-740, DC-780, MC-3500 & MC-4500 — 24” (600 mm) PIPESC-310 & SC-310-3 — 12” (300 mm) PIPE

StormTech Isolator Row (not to scale)

Examples of culvert cleaning nozzles appropriate for Isolator Rowmaintenance. (These are not StormTech products.)


A Family of Products and Services

StormTech provides state of the art products and services that meet or exceed industry performancestandards and expectations. We offer designers, regulators, owners and contractors the highestquality products and services for stormwater management that “Saves Valuable Land and ProtectsWater Resources.”

• MC-4500 Chambers and End Caps

• MC-3500 Chambers and End Caps

• SC-310 Chambers and End Caps

• SC-310-3 Chambers and End Caps

• DC-780 Chambers and End Caps

• SC-740 Chambers and End Caps

• SC, DC and MC Fabricated End Caps

• Fabricated Manifold Fittings

• Patented Isolator Row for Maintenance and Water Quality

• Chamber Separation Spacers

• In-House System Layout Assistance

• On-Site Educational Seminars

• Worldwide Technical Sales Group

• Centralized Product Applications Department

• Research and Development Team

• Technical Literature, O&M Manuals and Detailed CAD drawings all downloadable via our Web Site

MANIFOLD (SIZE TBD BY ENGINEER/SEE TECH SHEET #7

FOR MANIFOLD SIZING GUIDANCE / SHOWN AS 15” X 15”)

PLACE MINIMUM 17.5’ OF AASHTOM288 CLASS 1 WOVEN

GEOTEXTILE OVER BEDDING STONE FOR SCOUR PROTECTION

AT ALL CHAMBER INLET ROWS

ISOLATOR ROW

130.16’

137.08’

OUTLET CONTROLSTRUCTURE (DESIGNBY ENGINEER/PROVIDED BY OTHERS)

OUTLET MANIFOLD (SIZE TBDBY ENGINEER / SEE TECH SHEET #7 FOR MANIFOLDSIZING GUIDANCE /SHOWNAS 15” x 15”)

STRUCTURE WITH WEIR(DESIGN BY ENGINEER /PROVIDED BY OTHERS)

MANIFOLD (SIZE TBD BYENGINEER / SEE TECH SHEET#7 FOR MANIFOLD SIZINGGUIDANCE / SHOWN AS15” X 15”)

DUAL WALL PERFORATEDHDPE UNDERDRAIN (SIZETBD BY ENGINEER / SHOWNAS 6”)

STRUCTURE WITH WEIR(DESIGN BY ENGINEER / PROVIDED BY OTHERS)

ISOLATOR ROW

84.0

0’

80.5

0’

MC-4500MC-3500 DC-780

SC-740 SC-310

Please contact one of our inside Technical Service professionals or Engineered Product Managers (EPMs) todiscuss your particular application. A wide variety of technical support material is available from our website atwww.stormtech.com. For any questions, please call StormTech at 888-892-2694.

Example of a Typical Chamber Layout

www.stormtech.com www.stormtech.com

70 Inwood Road, Suite 3 Rocky Hill Connecticut 06067

860.529.8188 888.892.2694 fax 866.328.8401 fax 860-529-8040 www.stormtech.com

Save Valuable Land and Protect Water Resources

MC-4500MC-4500MC-4500 SC-740SC-740SC-740 SC-740

ADS “Terms and Conditions of Sale” are available on the ADS website, www.ads-pipe.com.Advanced Drainage Systems, the ADS logo, and the green stripe are registered trademarks of Advanced Drainage Systems. StormTech® and the Isolator® Row are registered trademarks of StormTech, IncLEED® and the Green Building Council Member logo are registered trademarks of the U.S. Green Building Council.

© 2012 Advanced Drainage Systems, Inc. #10818 02/13


W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx EXHIBIT E

5.5 Exhibit E Additional BMP’s

TRITON CATCH BASIN INSERTS

First line of defense against trash in storm

drain systems

Specifications• Easytoinstallinnewandexisting

catchbasins

• Meetsbestavailabletechnologyforuse

instormwaterbestmanagementpractices

(BMP)

• Round,square,rectangular,lowprofileand

custommodels

• Non-reactivehighdensitypolyethylene

(HDPE)plasticconstruction,withU.V.

inhibitors

• Media-Pakcartridgesavailableforthe

removalofsediments,hydrocarbons,and

litter

• Quickandeasyservicingmadeavailableby

replaceableMedia-Paks

Notes:

1.Alldimenionsareininches

2.UnitsareconstructedfromHDPEplasticwithU.V.inhibitors

3.MediacartridgescanbeinterchangedwithGeotrapseriesassiteconditionschange

4. Lowprofilecartridgesarealsoavailableforshallowcatchbasins

5.Customsizesareavailabletofitmostapplications

6.Optionaltrashanddebrisguardavailable

7.Dualstageanddualcapacitycartridgesalsoavailable

D

B

C A

E

F

*Dimenions“A”and“B”canbeadjustedtosuitvaryingsizesofeachbasins.

**Dimension“G”isbasindepth.***Dimension“H”iscartridgeheight.

Model # A* B* C D E F G** # cartridges H*** Basin Type

TR1212 15.0 15.0 11.0 11.0 6.75 3.50 6.0 1Short 4.5 HDPE

TR12RD Ø15.0 Ø11.0 6.75 3.5 6.0 1Short 4.5 HDPE

TR1616 20.0 20.0 14.0 14.0 6.75 3.5 10.5 1Std 8.5 HDPE

TR16RD Ø20.0 Ø11.0 6.75 3.5 6.0 1Short 4.5 HDPE

TR1818 24.0 24.0 18.0 18.0 10.0 6.25 10.5 1Std 8.5 HDPE

TR18RD Ø24.0 Ø16.5 6.75 3.5 10.5 1Std 8.5 HDPE

TR1824 19.0 25.0 18.0 18.0 10.0 6.25 10.5 1Std 8.5 HDPE

TR2024 21.0 25.0 18.0 18.0 10.0 6.25 10.5 1Std 8.5 HDPE

TR24SR 27.0 27.0 23.5 23.5 14.0 10.0 13.0 1Std 8.5 HDPE

TR24RD Ø28.0 Ø21.0 14.0 10.0 13.0 1Std 8.5 HDPE

TR2436 32.0 40.0 22.0 29.0 14.0 10.0 21.0 1Tall 16.5 HDPE

TR3030 34.0 34.0 22.0 29.0 14.0 10.0 21.0 1Tall 16.5 HDPE

TR36SR 36.0 36.0 33.0 33.0 14.0 10.0 22.0 1Tall 16.5 FIBRG

TR36RD Ø36.0 Ø33.0 14.0 10.0 22.0 1Tall 16.5 FIBRG


TR4848 48.0 48.0 42.0 42.0 24.0 19.75 22.0 1Tall 17.5 FIBRG


Standard Dimensions (in inches)

ENGINEERED SOLUTIONS

800.338.1122•www.ContechES.com

Triton Drop InletTheTritonDropInletinserttrapshydrocarbonsandothercontaminantssuchasmetalssandandsilt

fromstormwaterrunoff.Itisinstalledbelowthegrateofstormdraininlets.

UGTritonCatchBasin3/12

©2012ContechEngineeredSolutionsLLC

800.338.1122

www.ContechES.com

AllRightsReserved.PrintedintheUSA.

NOTHINGINTHISCATALOGSHOULDBECONSTRUE.ASANEXPRESSEDWARRANTY

ORANIMPLIEDWARRANT.OFMERCHANTABILITYORFITNESSFORANYPARTICULAR

PURPOSE.SEETHECONTECHSTANDARDCONDITIONSOFSALE(VIEWABLEAT

WWW.CONTECHES.COM/COS)FORMOREINFORMATION.


Get Social With Us!

Specifications• Easytoinstallinnewandexistingcurbinlets

• Meetsbestavailabletechnologyforuse

instormwaterbestmanagementpractices

(BMP)

• Non-reactivehighimpactpolystyreneplastic

constructionwithU.V.inhibitors.Over40

percentoftheplasticusedcomesfrom

recycledcontent.

• Media-Pakscartridgesavailableforthe

removalofsediments,hydrocarbonsand

litter

• DisposableMedia-Pakisconstructedfrom

durablegeotextile,polypropylenefabric

• OptionalStormWeb™systemdesignedto

assistintheremovaloftrashanddebris,in

compliancewithTMDLrequirements.

• Media-Pakmayberemovedthroughthe

curbopeningforeaseofmaintenance

Model A (curb opening)

TRC2 2.00

TRC2.5 2.50

TRC3 3.00

TRC3.5 3.50

TRC4 4.00

TRC5 5.00

TRC6 6.00

TRC7 7.00

TRC8 8.00

TRC9 9.00

TRC10 10.0

TRC12 12.00

TRC14 14.00

TRC21 21.00

TRC28 28.00

Standard Dimensions (in feet)

Notes:

1.Alldimensionsareinfeet.Customsizesalsoavailable.

2.ProductisconstructedofHighImpactPolystyrenePlastic,withU.V.inhibitors.Over40%recycledcontent.

3.DisposableMedia-Pakisconstructedofdurablegeotextilefabric,wovenwithperforatedpoly-propylene.

4.Media-Pakcageisconstructedusing8gaugeType304StainlessSteel.

5.Insertbodyissecuredtoinsidewallusing(2)1/4”thickbracketspersection,attachedusing3/8”x3”expansionanchorbolts.

6.OptionalStormWeb™,designedforcapturinglargertrashanddebris.

7.Mediaisnon-hazardousperEPAandOSHAstandards.

8.Insertshallbeinstalledandmaintainedinaccordancewithmanufacturerrecommendations.

Triton Curb InletTheTritonCurbInletisdesignedtobeinsertedbelowthestreet/curbopeningofstormdraininlets.

Itattachestosidesofcatchbasinusinghardwaresuppliedbymanufacturer.Flowisdesignedtobypassinsertinlargestormevents.

TRITON CATCH BASIN INSERTS

The VortClarex® system is an oil/water separator that utilizes

coalescing media to efficiently remove freely dispersed oil and other liquid

pollutants from urban runoff and industrial discharges. It specifically

targets oil and grease and is designed for sites where removal of

these pollutants is of greatest concern or where oil and grease

effluent targets are specified. It is typically installed belowground

and in-line with the piping system and can also be installed in

pre-assembled concrete manhole or vault designs.

VortClarex specifically targets oil and grease

Conventional oil/water separators provide

gravity separation by using baffles or

T-sections, but are only effective on oil

droplets greater than 150 microns. The

VortClarex coalescing media maximizes

surface area, increasing performance and

effluent quality. It is typically sized to remove

oil droplets as small as 60 microns and

achieve an effluent concentration of 10

mg/L or less.

The VortClarex coalescing media is housed

within a precast concrete vault. Unlike other

oil/water separators constructed of fiberglass

or steel, it does not require anti-floatation

hold-down straps or concrete traffic collars.

Maintaining the system is easy using a

standard water hose and vacuum truck, and

the media can be cleaned either inside or

outside the structure.

In most cases the system will be installed

belowground to treat stormwater runoff;

however treating oily water from floor

drains and vehicle wash down pads

is also possible with the VortClarex. In

addition to belowground applications,

the VortClarex can also be used to treat

process and pumped flow applications in an

aboveground configuration.

Features and Benefits:

• Polypropylenecoalescingmedia

o Removes up to 99% of free oil

droplets down to 60 microns

(standard design)

o EffluenthasTPHconcentrationsof

10 mg/L or less in typical stormwater

applications

• Non-turbulentflowthroughthesystem

o Maximizes efficiency by increasing

rise rate and size of droplets

• Precastconcretestructurehousing

o Ensures durability

oMeetsHS-20loadingrequirements

o Providesforashallowinstallation

• Belowgroundsystemmaximizesland

use

• MeetsSpillPrevention,Controland

CounterMeasure(SPCC)requirements

• Standardandcustommodelsavailable

How it Works:

Flows enter the VortClarex system via a

non-clog diffuser and are distributed across

the chamber width. The influent passes over

a solids baffle wall where settlable solids

drop out, reducing the amount of solids in

the flow as it enters the coalescing media.

As the flow passes through the media, oily

pollutants accumulate on the surface and

come into contact with others to form larger,

more buoyant droplets. These buoyant

droplets rise upward through the media and

are released near the water surface. The

oil is trapped behind the outlet T-pipe, and

treated water exits the system.

™

Superior Oil/Water Separation: VortClarex®

800.338.1122•www.ContechES.com

Stormwater Solutions from CONTECH

VortClarex04/12

©2012CONTECHENGINEEREDSOLUTIONSLLC

800.338.1122

www.ContechES.com

AllRightsReserved.PrintedintheUSA.

NOTHINGINTHISCATALOGSHOULDBECONSTRUEDASANEXPRESSED

WARRANTYORANIMPLIEDWARRANTYOFMERCHANTABILITYORFITNESSFORANY

PARTICULARPURPOSE.SEETHECONTECHSTANDARDCONDITIONOFSALES

(VIEWABLEATWWW.CONTECHES.COM/COS)FORMOREINFORMATION

Get Social With Us!

Recommended VortClarex Tyical Pipe Size Model Dimensions Sump Depth Treatment Flow Inlet/Outlet ft m ft m gpm lps in mm

VCL30 6 x 3 1.8 x 0.9 3.75 1.14 110 6.9 6 150

VCL40 8x4 2.4x1.2 3.75 1.14 150 9.6 6 150

VCL60-1 12x6 3.7x1.8 3.58 1.09 225 14.2 8 200

VCL60-2 12x6 3.7x1.8 3.58 1.09 440 27.7 10 250

VCL80-1 16x8 4.9x2.4 3.25 0.99 300 18.9 12 300

VCL80-2 16x8 4.9x2.4 3.42 1.03 620 39.1 12 300

VCL80-3 16x8 4.6x2.4 3.42 1.03 880 55.5 12 300


™

Contech VortClarex Model Sizes and Peak Flow Capacity


W:\Projects 2010\107. Baldridge Properties\10713-1 Central Avenue Zoning\03 Design and Permitting\SFWMD\Engineering Report.docx EXHIBIT F

5.6 Exhibit F City On Naples Email

surface ater management engineering eport for new

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