Aqua Dome Express Car Wash

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Aqua Dome Express Car Wash Stormwater Design Calculations Prepared by: 6997 Professional Parkway East, Suite B Lakewood Ranch, Florida 34240 (941) 444-6644 www.morrisengineering.

1 Aqua Dome Express Car Wash Stormwater Design Calculations Prepared by: 6997 Professional Parkway East, Suite B Lakewood Ranch, Florida (941) Prepared for: Florida Gulf Coast Adventures, LLC 847 Enterprise Circle, Suite 201 Bradenton, FL July 2017 I hereby certify that the enclosed calculations were performed by me or under my direct supervision. Matthew J. Morris, P.E. Florida Registration #68434

2 Table of Contents I. Project Narrative II. III. IV. Project Paving, Grading and Drainage Plan Drainage Calculations Rational Coefficient Calculations Attenuation and Treatment Calculations Stage Storage Calculations KvKh Calculation Calculations Modret Drawdown Analysis Appendix NRCS Web Soil Survey Data Exhibit A Exhibit B Exhibit C Exhibit D Exhibit E Exhibit F

3 I. PROJECT NARRATIVE

4 Project Narrative Existing Conditions: The project is located at 4615 S. Tamiami Trail, 2007 Fiesta Dr. and 2014 Sandrala Dr. within Sarasota County. The existing use of the site is vacant commercial. The total site consists of 0.85 acres. Proposed Conditions: The current application is being submitted to develop the parcel into a car wash with associated paving, grading, drainage and utilities. Stormwater Design: The stormwater design includes the use of an underground vault system for treatment and attenuation of the site. Drainage inlets connected by pipes are proposed to convey the runoff from the site to the underground stormwater system. The site will discharge to a bubbler box located at the southwest corner of the property. Modret calculations were done to confirm that the system draws down and recovers in less than 72 hours. The Sarasota County soil survey was used to set the SHGW and confirm the bottom of the system is a minimum of 1 above the SHGW elevation. The permeability rates from the soil survey were used for the vertical and horizontal permeability calculations.

5 II. PAVING, GRADING & DRAINAGE PLAN

7 III. DRAINAGE CALCULATIONS

8 Exhibit A

9 Input Data & Calculations for Stormwater Management System Analysis Project: Aqua Dome Express Car Wash Composite Rational Coefficient Calculations Basin Surface Area Runoff Product Description (acres) Coefficient PRE impervious areas pervious areas Sum: C PRE : 0.28 POST impervious areas improved lawn Sum: C POST : 0.78

10 Exhibit B

11 STORMWATER ATTENUATION & TREATMENT CALCULATIONS (MODIFIED RATIONAL METHOD) Rainfall Intensity Relationship: i = a / ( b + T D ) Storm Frequency 25 year Selecting two points from the appropriate IDF curve: Duration, T D Intensity, i 10 min in./hr. 90 min in./hr. Substitute values, add equations, solve for constants a b 31.1 Pre-Development Conditions: Contributing Basin Area, A Runoff Coefficient, C (PRE) Time of Concentration, t C(PRE) Rainfall Intensity, I (PRE) Predeveloped Disch. Rate, Q PRE Proposed Disch. Rate, Q POST Post-Development Conditions: Contributing Basin Area, A Runoff Coefficient, C Time of Concentration, t C(POST) 0.85 ac min in./hr cfs 1.98 cfs 0.85 ac min. Calculated Values: Duration for Max. Detention, T D min. Peak Runoff Rate, Q P 3.74 cfs Minimum Storage Volume, V S 2,887 ft 3 Water Quality (Treatment) Calculations: Treatment Requirement 0.50 in. (Rainfall) Min. Required Treatment Vol. 1,551 ft 3 Total Volume Required 4,438 ft 3

12 Exhibit C

TREATMENT EL. = 27.68' BOTTOM EL. = 26.93' SYSTEM STORAGE CALCULATION TM CULTEC, Inc. Subsurface Stormwater Management Systems CULTEC P.O. Box 280 878 Federal Road Brookfield, CT 06804 www.cultec.

IT IS THE ULTIMATE RESPONSIBILITY OF THE PROJECT ENGINEER OF RECORD TO ENSURE THAT THE CULTEC SYSTEM'S DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS.

13 TREATMENT EL. = 27.68' BOTTOM EL. = 26.93' SYSTEM STORAGE CALCULATION TM CULTEC, Inc. Subsurface Stormwater Management Systems CULTEC P.O. Box Federal Road Brookfield, CT PH: (203) PH: (800) 4-CULTEC FX: (203) tech@cultec.com THIS DRAWING WAS PREPARED TO SUPPORT THE PROJECT ENGINEER OF RECORD FOR THE PROPOSED SYSTEM. IT IS THE ULTIMATE RESPONSIBILITY OF THE PROJECT ENGINEER OF RECORD TO ENSURE THAT THE CULTEC SYSTEM'S DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. IT IS THE PROJECT ENGINEER OF RECORD'S RESPONSIBILITY TO ENSURE THAT THE CULTEC PRODUCTS ARE DESIGNED IN ACCORDANCE WITH CULTEC'S MINIMUM REQUIREMENTS. CULTEC DOES NOT APPROVE PLANS, SIZING, OR SYSTEM DESIGNS. SYSTEM STAGE-STORAGE TABLE AQUA DOME, FL SYSTEM CALCULATION SHEET CULTEC STORMWATER CHAMBER PROJECT NO: DATE: 7/13/17 DRAWN BY: GMJ CHECKED BY: AM SCALE: N.T.S. SHEET NO: 2 OF 4

14 Exhibit D

15 Aqua Dome Express Car Wash Permeability (Kv Kh) Calculations SCS Soil Type = 10 - EauGallie and Myakka Fine Sands County = Sarasota Depth (inch) Layer SCS Vert Permeability * (Kvsi) (in/hr) Zi/Kvsi Khsi=Kvsi x 1.5 Khsi x Zi Init Final Thickness (Zi) Low End High End Avg Kvsi (in/hr) Average Saturated Vertical Permeability - Kvs, {Sum of (Zi) / Sum(Zi/Kvsi)} = Average Unsaturated Vertical Permeability - Kvu**, (Kvu = Kvs x 2/3) = Average Saturated Horizontal Permeability - Khs, {Sum(Zi x Khsi) / (Sum of (Zi)} (in/hr) (ft/day) * SCS data is for Saturated Conditions ** See Modret Manual Version 6.0, Page 25

16 Exhibit E

17 MODRET SUMMARY OF UNSATURATED & SATURATED INPUT PARAMETERS PROJECT NAME : Aqua Dome POLLUTION VOLUME RUNOFF DATA USED UNSATURATED ANALYSIS EXCLUDED Pond Bottom Area 3, ft² Pond Volume between Bottom & DHWL 4, ft³ Pond Length to Width Ratio (L/W) 4.90 Elevation of Effective Aquifer Base ft Elevation of Seasonal High Groundwater Table ft Elevation of Starting Water Level ft Elevation of Pond Bottom ft Design High Water Level Elevation ft Avg. Effective Storage Coefficient of Soil for Unsaturated Analysis 0.13 Unsaturated Vertical Hydraulic Conductivity 2.75 ft/d Factor of Safety 2.00 Saturated Horizontal Hydraulic Conductivity ft/d Avg. Effective Storage Coefficient of Soil for Saturated Analysis 0.17 Avg. Effective Storage Coefficient of Pond/Exfiltration Trench 1.00 Hydraulic Control Features: Top Bottom Left Right Groundwater Control Features - Y/N N N N N Distance to Edge of Pond Elevation of Water Level Impervious Barrier - Y/N N N N N Elevation of Barrier Bottom Analysis Date: 7/18/2017

18 MODRET TIME - RUNOFF INPUT DATA PROJECT NAME: AQUA DOME STRESS PERIOD NUMBER INCREMENT OF TIME (hrs) VOLUME OF RUNOFF (ft³) Unsat , Analysis Date: 7/18/

19 MODRET SUMMARY OF RESULTS PROJECT NAME : Aqua Dome CUMULATIVE TIME (hrs) WATER ELEVATION (feet) INSTANTANEOUS INFILTRATION RATE (cfs) AVERAGE INFILTRATION RATE (cfs) CUMULATIVE OVERFLOW (ft³) * Analysis Date: 7/18/2017

20 MODRET SUMMARY OF RESULTS PROJECT NAME : Aqua Dome CUMULATIVE TIME (hrs) WATER ELEVATION (feet) INSTANTANEOUS INFILTRATION RATE (cfs) AVERAGE INFILTRATION RATE (cfs) CUMULATIVE OVERFLOW (ft³) Analysis Date: 7/18/2017

21 MODRET SUMMARY OF RESULTS PROJECT NAME : Aqua Dome CUMULATIVE TIME (hrs) WATER ELEVATION (feet) INSTANTANEOUS INFILTRATION RATE (cfs) AVERAGE INFILTRATION RATE (cfs) CUMULATIVE OVERFLOW (ft³) Maximum Water Elevation: hours * Time increment when there is no runoff Maximum Infiltration Rate: ft/day hours Analysis Date: 7/18/2017

22 INFILTRATION : AQUA DOME 6,800 Volume Infiltrated (ft³) 6,600 6,400 6,200 6,000 5,800 5,600 5,400 5,200 5,000 4,800 4,600 4,400 4,200 4,000 3,800 3,600 3,400 3,200 3,000 2,800 2,600 2,400 2,200 2,000 1,800 1,600 1,400 1,200 1, Time (hrs) Total Volume Infiltrated = 6,978 ft³

23 INFILTRATION : AQUA DOME 28.5 Water Elevation (ft) Time (hrs) Max Water Elevation = ft

24 IV. APPENDIX

25 Exhibit F

26 Map Unit Description: EauGallie and Myakka fine sands---sarasota County, Florida Sarasota County, Florida 10 EauGallie and Myakka fine sands Map Unit Setting National map unit symbol: 1l0bm Mean annual precipitation: 55 to 63 inches Mean annual air temperature: 70 to 77 degrees F Frost-free period: 335 to 365 days Farmland classification: Farmland of unique importance Map Unit Composition Eaugallie and similar soils: 45 percent Myakka and similar soils: 40 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Eaugallie Setting Landform: Flatwoods on marine terraces Landform position (three-dimensional): Talf Down-slope shape: Convex Across-slope shape: Linear Parent material: Sandy and loamy marine deposits Typical profile A - 0 to 6 inches: fine sand E - 6 to 22 inches: fine sand Bh - 22 to 44 inches: fine sand E' - 44 to 48 inches: fine sand Btg - 48 to 66 inches: sandy loam Cg - 66 to 80 inches: loamy fine sand Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Poorly drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.60 in/hr) Depth to water table: About 6 to 18 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Sodium adsorption ratio, maximum in profile: 4.0 Available water storage in profile: Moderate (about 7.1 inches) Interpretive groups Land capability classification (irrigated): None specified Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/5/2017 Page 1 of 3

27 Map Unit Description: EauGallie and Myakka fine sands---sarasota County, Florida Land capability classification (nonirrigated): 4w Hydrologic Soil Group: A/D Other vegetative classification: South Florida Flatwoods (R155XY003FL), Sandy soils on flats of mesic or hydric lowlands (G155XB141FL) Hydric soil rating: No Description of Myakka Setting Landform: Flatwoods on marine terraces Landform position (three-dimensional): Talf Down-slope shape: Convex Across-slope shape: Linear Parent material: Sandy marine deposits Typical profile A - 0 to 6 inches: fine sand E - 6 to 24 inches: fine sand Bh - 24 to 42 inches: fine sand Cg - 42 to 80 inches: fine sand Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Poorly drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: About 6 to 18 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Sodium adsorption ratio, maximum in profile: 4.0 Available water storage in profile: Low (about 5.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4w Hydrologic Soil Group: A/D Other vegetative classification: South Florida Flatwoods (R155XY003FL), Sandy soils on flats of mesic or hydric lowlands (G155XB141FL) Hydric soil rating: No Minor Components Ona Percent of map unit: 5 percent Landform: Flats on marine terraces Landform position (three-dimensional): Talf Down-slope shape: Convex Across-slope shape: Linear Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/5/2017 Page 2 of 3

28 Map Unit Description: EauGallie and Myakka fine sands---sarasota County, Florida Other vegetative classification: South Florida Flatwoods (R155XY003FL), Sandy soils on flats of mesic or hydric lowlands (G155XB141FL) Hydric soil rating: No Smyrna Percent of map unit: 5 percent Landform: Flats on marine terraces Landform position (three-dimensional): Talf Down-slope shape: Convex Across-slope shape: Linear Other vegetative classification: South Florida Flatwoods (R155XY003FL), Sandy soils on flats of mesic or hydric lowlands (G155XB141FL) Hydric soil rating: No Wabasso Percent of map unit: 5 percent Landform: Flatwoods on marine terraces Landform position (three-dimensional): Talf Down-slope shape: Convex Across-slope shape: Linear Other vegetative classification: South Florida Flatwoods (R155XY003FL), Sandy soils on flats of mesic or hydric lowlands (G155XB141FL) Hydric soil rating: No Data Source Information Soil Survey Area: Sarasota County, Florida Survey Area Data: Version 13, Sep 16, 2016 Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/5/2017 Page 3 of 3

82 31' 50'' W Soil Map Sarasota County, Florida 82 31' 47'' W 27 17' 15'' N 3019110 3019120 3019130 3019140 3019150 3019160 3019170 3019180 3019190 3019200 3019210 348520 348530 348540 348550 348560

29 82 31' 50'' W Soil Map Sarasota County, Florida 82 31' 47'' W 27 17' 15'' N ' 15'' N Soil Map may not be valid at this scale ' 11'' N ' 11'' N 82 31' 50'' W N Map Scale: 1:542 if printed on A portrait (8.5" x 11") sheet. Meters Feet Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS ' 47'' W Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/5/2017 Page 1 of 3

30 Soil Map Sarasota County, Florida MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Sarasota County, Florida Survey Area Data: Version 13, Sep 16, 2016 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 1, 2014 Mar 3, 2014 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/5/2017 Page 2 of 3

31 Soil Map Sarasota County, Florida Map Unit Legend Sarasota County, Florida (FL115) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 10 EauGallie and Myakka fine sands 40 Tavares fine sand, 0 to 5 percent slopes % % Totals for Area of Interest % Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/5/2017 Page 3 of 3

Soil Map Boulder County Area, Colorado (Planet Blue Grass) Web Soil Survey National Cooperative Soil Survey

Soil Map Boulder County Area, Colorado (Planet Blue Grass) Web Soil Survey National Cooperative Soil Survey 475910 476000 476090 476180 476270 476360 105 16' 21'' W 476450 476540 476630 476720 476810 4453350 4453440 4453260 4453350 4453170 4453260 4453080 4453170 4453080 475820 475910 4452990 476000 476090 476180