surface ater management engineering eport for new
Post on 12-Apr-2022
1 Views
Preview:
TRANSCRIPT
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
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 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.
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 Page 2
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)
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 Page 3
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
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 Page 4
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
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 Page 5
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.
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 Page 6
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
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 Page 7
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
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 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):
Low Intensity Commercial
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:
Low Intensity Commercial
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):
Low Intensity Commercial
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
Pre-Loading (kg/yr) 30.0 4.5
Post-Loading (kg/yr) 22.3 3.4
Required Removal (%) -34.3% -34.3%
Additional Removal 96.0%
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%
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%.
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 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
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 EXHIBIT C
5.3 Exhibit C ICPR Modeling Input and Result Reports
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 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
4 Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com
Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com 5
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
6 Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com
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
Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com 7
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
8 Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com
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
Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com 17
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.)
18 Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com
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
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 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
TR42RD Ø42.0 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
TR48RD Ø48.0 Ø33.0 14.0 10.0 22.0 1Tall 16.5 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.
ENGINEERED SOLUTIONS
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
ENGINEERED SOLUTIONS
™
Contech VortClarex Model Sizes and Peak Flow Capacity
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 EXHIBIT F
5.6 Exhibit F City On Naples Email
top related