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HomeMy WebLinkAbout22SITE3 StormWater PP Rev 051022 Stormwater Pollution Prevention Plan Leemilt’s Petroleum 612 Norwich-Salem Turnpike, Oakdale, Connecticut 06370 Revision 2 November 4, 2021; January 18, 2022; May 10, 2022 Freeman File No.: 2021-1106 Prepared for: Shahani Inc. 53 East Industrial Road, Unit C1 Branford, Connecticut 06405 Prepared by: Freeman Companies, LLC 36 John Street Hartford, Connecticut 06106 Stormwater Pollution Prevention Plan Leemilt’s Petroleum – Shahani Inc. 612 Norwich-Salem Turnpike, Oakdale, CT 06370 ii Table of Contents 1. Introduction ........................................................................................................................................................... 3 2. Project and Existing Site Description .................................................................................................................... 3 3. Proposed Drainage Conditions ............................................................................................................................. 3 4. Drainage Calculations ........................................................................................................................................... 3 5. Erosion and Sedimentation Control ...................................................................................................................... 4 6. Maintenance and Operations ................................................................................................................................ 5 Appendix A Figure 1 – Site Location Map FEMA Flood Insurance Rate Map (FIRMette) NRCS Web Soil Survey: Hydrologic Soil Group Drainage Area Map: Pre - Conditions Drainage Area Map: Post - Conditions Appendix B WQV Worksheet WQF Worksheet TSS Worksheet HydroCAD Report: Pre and Post Conditions StormSewers Pipe Capacity Profile: Pre and Post Conditions Stormwater Pollution Prevention Plan Leemilt’s Petroleum – Shahani Inc. 612 Norwich-Salem Turnpike, Oakdale, CT 06370 1. Introduction The purpose of this Stormwater Pollution Prevent Plan (SWPP) is to provide information and guidance on the proposed stormwater management system, and erosion and sedimentation controls during and after project construction. The site improvements have been designed to be compatible with the surrounding neighborhood, improve overland stormwater runoff conditions, and not have any significant negative impacts on any downstream locations. The SWPP has been developed in accordance with the requirements of the General Permit for the Discharge and Dewatering Wastewaters from Construction Activities, dated August 21, 2013. The SWPP has been prepared using sound engineering practices and is consistent with the 2004 Connecticut Stormwater Quality Manual and 2002 Connecticut Guidelines for Soil Erosion and Sediment Control. A copy of this SWPP shall be maintained on-site for the duration of the construction activity. 2. Project and Existing Site Description The site is currently a gas station that sits at the south western corner of the intersection of Norwich-Salem Tnpke (RT 163 / 82) and Raymond Hill Rd (RT 82). The site is approximately 0.96 acres with existing wetlands in the southwestern corner. Buffering the wetlands is a wooded area, followed by the gas station site in the eastern half of the property. Stormwater from the wooded area drains to the wetlands. Stormwater from the rest of the developed site drains in the southeasterly direction. There is an existing catch basin in the northeastern corner of the site that collects runoff from a catch basin on Norwich-Salem Tnpke, and connects to a catch basin in the southeastern corner of the site. This catch basin in the southeastern corner has filled with sediment and all stormwater directed to this catch basin, both overland flow and piped, creates ponding in the immediate area, overtops the existing curb, and outfalls into the wooded area via overland flow directly to downstream locations untreated. The proposed project will include, but is not limited to, the renovation of the existing gas station building, installation of new gasoline pumping facilities, installation of new gasoline storage tanks, installation of a new septic system, improvements to the existing storm drainage system, and repaving of the asphalt on site. Freeman Companies has prepared site improvements to the existing proposed Site Plan prepared by North Star Surveying & Engineering LLC dated 10/23/2020. The site improvements include, but are not limited to, improvements to the existing storm drainage system to properly treat stormwater runoff prior to discharge per the 2004 CT Stormwater Manual. Per the FEMA Flood Insurance Rate Map (FIRMette), the site is not located within a flood plain (Appendix A). 3. Proposed Drainage Conditions The site improvements to the existing drainage infrastructure include replacing the exiting catch basin in the northeast corner of the site, replacing the existing 15” RCP culvert with a new 15” PVC pipe, replacing the existing catch basin in the southeast corner of the site with a deep sump catch basin, installing an ADS Barracuda Max S3 hydrodynamic separator, and installing a level spreader. The stormwater management system will provide treatment to any stormwater runoff carrying oils, from pumping spills and/or car fluid leaks, prior to being discharged. The discharge will connect to a level spreader with a subsurface perforated pipe to allow even and less-erosive discharge immediately downstream. All runoff from impervious surfaces, including the roof of the proposed building, will be captured and treated with the proposed stormwater management system. According to the NRCS Web Soil Survey (Appendix A), the site’s soil is a HSG B soil meaning it is well draining and overland flow will infiltrate well. For reference, the hydrologic soil group (HSG) is classified based on the soil’s infiltration rate. Ranging from HSG A to D, HSG A soils have a high infiltration rate, while a HSG D has a low infiltration rate. Stormwater Pollution Prevention Plan Leemilt’s Petroleum – Shahani Inc. 612 Norwich-Salem Turnpike, Oakdale, CT 06370 4. Drainage Calculations The proposed stormwater management system has been designed to treat the Water Quality Flow (WQF), which is based on the Water Quality Volume (WQV), based on the 2004 CT Stormwater Manual’s requirements. Designing based on the WQV is more appropriate for projects in which a substantial increase in impervious surface coverage requires detention. The proposed project has a decrease in impervious area of approximately 700± s.f. compared to the existing conditions, therefore, treating the WQF meets the regulations set by the 2004 CT Stormwater Manual. Both the WQF and Total Suspended Solids (TSS) amounts required to be treated for this project have been met. Please refer to the Appendix B for WQV, WQF, and TSS tables. HydroCAD and AutoCAD’s StromSewers were used to model the capacity of the existing and proposed pipe networks. HydroCAD was used to determine the volumetric flow for each drainage area while StormSewers was used to calculate the pipe capacity and hydraulic grade line. The HydroCAD model was modeled using the 2, 10, 25, 50, and 100 year storm events while the StormSewers model was developed using the 10 year storm event. The proposed conditions StormSewers profile shows that the proposed pipe network will successfully pass the 10 year storm without overtopping the catch basin. Please refer to Appendix B for the HydroCAD and StormSewers reports. Please refer to Appendix A for the pre and post condition drainage area maps for delineated drainage areas. 5. Erosion and Sedimentation Control It is important that the existing and proposed storm drain systems and their discharges to downstream water resource areas be protected during and after construction from sedimentation and pollutants to the maximum extent possible. All materials generated by demolition operations shall be removed off-site and disposed of in accordance with local and state regulations at approved disposal sites. No demolition debris will be allowed to enter any resource area or to be stored beyond the limits of work. All demolition debris shall be removed from the site as soon as possible, if not immediately. For any shortcomings of the control measures, corrective measures shall be taken. These include but are not limited to: removal of any sediment/debris within the stormwater system, cleaning any area that needs it, replacement or rebuilding of any non-functioning or damaged components or infrastructure, reseeding any area that needs it, placement of erosion control fabric as needed. The following are erosion and sedimentation control measures to be used on site and are delineated on the plan set. Inlet Protection (Silt Sack) – Inlet protection measures are used to prevent sediment from entering storm drainage systems. Install inlet protection as soon as storm drain inlets are installed and before land-disturbance activities begin in area with existing storm drain systems. Clean or replace the protection measure as sediment accumulates, the filter becomes clogged, and/or performance is compromised. Where there is evidence of sediment accumulation adjacent to the inlet protection measure, the deposited sediment must be removed as soon as possible. Compost Filter Sock – The purpose of compost filter sock is to filter sediment as sediment laden water flows downhill from the disturbance area to the downstream location. Install compost filter sock as shown on the plan set. Leave space for maintenance between toe of slope and compost filter sock. Install through middle of compost filter sock 10’ apart. Curve the end of the compost filter sock to help contain run off. Remove sediment if it reaches 1/3 the height of the compost filter sock. Should the compost filter sock decompose or become ineffective, replace section promptly. Inspect once every 7 calendar days or within 24 hours of the end of a storm event. Inspect compost filter sock for accumulated sediment height, damage, and gaps between fence and ground. Soil Stockpiles – The soil stockpiles shall be surrounded by two rows of compost filter sock. Stockpiles stored for more than 30 days shall be seeded with temporary cover to prevent erosion. Do not hose down or sweep soil or sediment accumulated on pavement or other impervious surfaces into any storm drain structures. Stormwater Pollution Prevention Plan Leemilt’s Petroleum – Shahani Inc. 612 Norwich-Salem Turnpike, Oakdale, CT 06370 Temporary Seed and Mulch – Temporary seeding and mulch shall be used no later than 7 days from the last construction activity on exposed soil areas. Temporary seeding shall be conductive to the season. Seeded areas shall also be mulched with straw reasonably free from noxious and foreign matter detrimental to the seeded grasses. Records of all stabilization activities and buffer zone condition shall be kept and noted on inspection reports. Inspect weekly seeded areas for failure and if needed reseed and repair as soon as possible. Soil Stabilization – Hay, straw matting, and/or stone, per the 2002 Connecticut Guidelines for Soil Erosion and Sediment Control, shall be used in conjunction with each other and used with sediment control measures to reduce erosion and sediment transport. The soil stabilization measures shall be inspected routinely and if needed repair/replenish as soon as possible. 6. Maintenance and Operations It is important that the existing and proposed storm drain systems and their discharges to downstream water resource areas be protected during and after construction from sedimentation and pollutants to the maximum extent possible. All materials generated by demolition operations shall be removed off-site and disposed of in accordance with local and state regulations at approved disposal sites. No demolition debris will be allowed to enter any resource area or to be stored beyond the limits of work. All demolition debris shall be removed from the site as soon as possible, if not immediately. Work in high groundwater areas shall be scheduled, when possible, so it can be completed in a dry period and in the shortest time possible. The following are maintenance recommendations for the various stormwater management items: Drainage Structure – New structures shall be installed with hooded outlets for pipes. Each drainage structure shall be inspected regularly. Any debris within the sump shall be removed. Water Quality Unit – The new water quality unit shall be maintained based on manufacturer’s specifications. Paved Areas - Existing driveways and sidewalks shall be swept as needed. Landscape Areas – Landscape areas shall be mowed regularly. Vegetation shall be pruned as necessary. Dust Control – Construction activities will result in emissions of dust to the surrounding areas. Spray water as necessary to control dust from construction activities. Containment Areas - All chemical and petroleum product containers stored on the site (excluding those contained within vehicles and equipment) shall be provided with impermeable containment which will hold at least 110% of the volume of the largest container, or 10% of the total volume of all containers in the area, whichever is larger, without overflow from the containment area. All chemicals and their containers shall be stored under a roofed area except for those chemicals stored in containers of 100 gallon capacity or more, in which case a roof is not required. Double-walled tanks satisfy this requirement. Stormwater Pollution Prevention Plan Leemilt’s Petroleum – Shahani Inc. 612 Norwich-Salem Turnpike, Oakdale, CT 06370 Waste Disposal - Construction site waste shall be properly managed and disposed of during the entire construction period. Additionally: • A waste collection area will be designated. The selected area will minimize truck travel through the site and will not drain directly to the adjacent wetlands. • Waste collection shall be scheduled regularly to prevent the containers from overfilling. • Spills shall be cleaned up immediately. • Defective containers that may cause leaks or spills will be identified through regular inspection. Any container found to be defective will be repaired or replaced immediately. • Any stockpiling of materials should be confined to the designated area as defined by the engineer. Dewatering – If dewatering is needed during the construction, it shall be in accordance with the General Permit and not result in any direct discharges in the storm drain system. Temporary measures shall be utilized to hold, minimize and reduce the velocities exiting any pumped dewatering waters. Special Material Precautions – To minimize the potential for discharge of construction materials to the receiving waters, the following additional precautions shall be followed on the site: a. Petroleum Products: All on-site vehicles will be monitored for leaks and receive maintenance as needed. Petroleum products will be stored in tightly sealed containers which are clearly labeled. Any asphalt substances used on-site will be applied according to the manufacturer’s recommendations. b. Fertilizers: Fertilizers are not expected as part of this project but if they are used, this Plan shall be updated accordingly and proper measures shall be taken to cover and prevent spills. c. Paints and Solvents: All containers will be tightly sealed and stored when not required for use. Washing or rinsing of paint buckets, brushes or accessories and/or excess material will not be discharged to the ground surface or the storm sewer system but will be properly disposed of according to manufacturer’s instructions and State and local regulations. Spill Cleanup - The following practices shall be implemented during construction activities to mitigate spills of materials and prevent their release to the waters or the State. a. Manufacturer’s recommended methods for spill cleanup will be clearly posted and site personnel will be made aware of the procedures and the location of the information and cleanup supplies. b. Materials and equipment necessary for spill cleanup will be kept in the material storage area on-site. Equipment and materials will include but not be limited to brooms, dust pans, mops, rags, gloves, goggles, kitty litter, sand, sawdust, and plastic and metal trash containers specifically for this purpose. Potential spills will most likely be related to fuels and lubricants used by the construction equipment. This use will be monitored and controlled. Stormwater Pollution Prevention Plan Leemilt’s Petroleum – Shahani Inc. 612 Norwich-Salem Turnpike, Oakdale, CT 06370 Appendix A Figure 1 – Site Location Map FEMA Flood Insurance Rate Map (FIRMette) NRCS Web Soil Survey: Hydrologic Soil Group Drainage Area Map: Pre - Conditions Drainage Area Map: Post - Conditions This page intentionally left blank. FIGURE 1 SHEET NO.36 JOHN STREET HARTFORD, CT 06106 WWW.FREEMANCOS.COM TEL:(860)251-9550 FAX:(860)986-7161 ELEVATE YOUR EXPECTATIONS SITE LOCATION MAP USGS QUADRANGLE MAP FITCHVILLE & PALMERTOWN, CT DATE 2021 LEEMILT'S PETROLEUM 612 NORWICH-SALEM TURNPIKE (RT 163/82) OAKDALE, CT 06370 This page intentionally left blank. National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250 Feet Ü SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOODHAZARD AREAS Without Base Flood Elevation (BFE)Zone A, V, A99With BFE or DepthZone AE, AO, AH, VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areasof 1% annual chance flood with averagedepth less than one foot or with drainageareas of less than one square mileZone X Future Conditions 1% Annual Chance Flood HazardZone X Area with Reduced Flood Risk due to Levee. See Notes.Zone X Area with Flood Risk due to LeveeZone D NO SCREENArea of Minimal Flood Hazard Zone X Area of Undetermined Flood HazardZone D Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature Base Flood Elevation Line (BFE) Effective LOMRs Limit of Study Jurisdiction Boundary Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below.The basemap shown complies with FEMA's basemapaccuracy standards The flood hazard information is derived directly from theauthoritative NFHL web services provided by FEMA. This mapwas exported on 11/8/2021 at 7:14 AM and does notreflect changes or amendments subsequent to this date andtime. The NFHL and effective information may change orbecome superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Legend OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES OTHER FEATURES MAP PANELS 8 B 20.2 The pin displayed on the map is an approximatepoint selected by the user and does not representan authoritative property location. 1:6,000 72°12'24"W 41°30'17"N 72°11'47"W 41°29'50"N Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020 This page intentionally left blank. Hydrologic Soil Group—State of Connecticut Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/8/2021 Page 1 of 445982104598220459823045982404598250459826045982704598280459821045982204598230459824045982504598260459827045982804598290733500733510733520733530733540733550733560733570733580733590733600733610733620 733510 733520 733530 733540 733550 733560 733570 733580 733590 733600 733610 733620 41° 30' 7'' N 72° 12' 8'' W41° 30' 7'' N72° 12' 3'' W41° 30' 5'' N 72° 12' 8'' W41° 30' 5'' N 72° 12' 3'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 25 50 100 150 Feet 0 5 10 20 30 Meters Map Scale: 1:580 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available 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 1:12,000. 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: State of Connecticut Survey Area Data: Version 21, Sep 7, 2021 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 20, 2019—Mar 27, 2019 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. Hydrologic Soil Group—State of Connecticut Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/8/2021 Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 15 Scarboro muck, 0 to 3 percent slopes A/D 0.2 13.0% 23A Sudbury sandy loam, 0 to 5 percent slopes B 0.3 27.6% 306 Udorthents-Urban land complex B 0.7 59.4% Totals for Area of Interest 1.2 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Hydrologic Soil Group—State of Connecticut Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/8/2021 Page 3 of 4 Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—State of Connecticut Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/8/2021 Page 4 of 4 DESIGN POINT 1 (DP-1) EX. CB - SOUTHEAST CORNER EX. CB - NORTHEAST CORNER TC=6 MIN. TC=6 MIN. DA1: TO EX. 15" RCP IMPERVIOUS: 10,310 S.F. PERVIOUS: 3,150 S.F. DA: 2 TO DP-1 IMPERVIOUS: 11,965 S.F. EX. 15" RCP DA: 3 DRAINS OFFSITE PERVIOUS: 21,785 S.F. FREEMAN COMPANIES, LLC 36 JOHN STREET HARTFORD, CT 06106 WWW.FREEMANCOS.COM TEL:(860)251-9550 TOLL FREE:(800)604-5141 FAX:(860)986-7161 ELEVATE YOUR EXPECTATIONS LEEMILT'S PETROLEUM - DRAINAGE AREA MAP - PRE CONDITIONS 612 NORWICH-SALEM TURNPIKE (RT 163/82) OAKDALE, CT 06370 DA MAP PRE LEGEND DRAINAGE AREA BOUNDARY TIME OF CONCENTRATION This page intentionally left blank. NO PARKI N G DESIGN POINT 1 (DP-1) EX. CB - SOUTHEAST CORNER EX. CB - NORTHEAST CORNER TC=6 MIN. TC=6 MIN. EX. 15" RCP DA: 1 TO EX. 15" RCP IMPERVIOUS: 11,080 S.F. PERVIOUS: 3,810 S.F. DA: 2 TO DP-1 IMPERVIOUS: 10,495 S.F. PERVIOUS: 250 S.F. DA: 3 DRAINS OFFSITE PERVIOUS: 21,575 S.F. FREEMAN COMPANIES, LLC 36 JOHN STREET HARTFORD, CT 06106 WWW.FREEMANCOS.COM TEL:(860)251-9550 TOLL FREE:(800)604-5141 FAX:(860)986-7161 ELEVATE YOUR EXPECTATIONS LEEMILT'S PETROLEUM - DRAINAGE AREA MAP - POST CONDITIONS 612 NORWICH-SALEM TURNPIKE (RT 163/82) OAKDALE, CT 06370 DA MAP POST LEGEND DRAINAGE AREA BOUNDARY TIME OF CONCENTRATION This page intentionally left blank. Stormwater Pollution Prevention Plan Leemilt’s Petroleum – Shahani Inc. 612 Norwich-Salem Turnpike, Oakdale, CT 06370 Appendix B WQV Worksheet WQF Worksheet TSS Worksheet HydroCAD Report: Pre and Post Conditions StormSewers Pipe Capacity Profile: Pre and Post Conditions This page intentionally left blank. Project:Designed:NVG Date:5/7/2022 Address:Checked:JNL Date:5/7/2022 0.495 ac 1.084 ac 3. Percent impervious cover, I (Impervious Area/Site Area)45.700 0.461 5. WQV = (1"*R*A)/12 0.042 ac ft or 1816 cu ft Conclusion Water Quality Volume (WQV) Worksheet Leemilt's Petroleum 612 Norwich-Salem Turnpike, Oakdale, CT 06370 1. Impervious cover area 2. Project Area 4. Volumetric runoff coefficient, R = 0.05 + 0.009(I) WQV to be used for WQF Calculations This page intentionally left blank. Project:Designed:NVG Date:5/7/2022 Address:Checked:JNL Date:5/7/2022 1.084 ac 2. Project Area 0.0017 sq mi 3. WQV 0.042 ac ft 0.462 in 5. CN = 1000/[10 + 5P +10Q -10(Q^2 + 1.25QP)^(1/2)]93 0.151 630 csm/in 8. WQF = (qu)*(A)*(Q)0.508 cfs or 228 gpm Conclusion The proposed ADS Barracuda Max S3 hydrodynamic separator has a treatment rate of 0.86 cfs which is greater than the required WQF. Water Quality Flow (WQF) Worksheet Leemilt's Petroleum 612 Norwich-Salem Turnpike, Oakdale, CT 06370 1. Site area 6. Ia = initial abstraction (Table 4.1 TR-55 - 2004 CT Stormwater Manual) 4. Q = runoff depth 7. qu = unit discharge (Exhibit 4-III TR-55 - 2004 CT Stormwater Manual) This page intentionally left blank. Location: A B C D E TSS Removal Starting TSS Amount Remaining BMP1 Rate1 Load* Removed (B*C) Load (C-D) Deep Sump and Hooded Catch Basin Outlet 0.25 1.00 0.25 0.75 ADS Barracuda Max S3 Hydrodynamic Seperator 0.80 0.75 0.60 0.15 Total TSS Removal =85% Project:Leemilt's Petroleum FC#2021-1106 Prepared By:NVG *Equals remaining load from previous BMP (E) Date:5/7/2022 which enters the BMP OUTFALL FROM WATER QUALITY UNIT TSS Removal Calculation Worksheet This page intentionally left blank. DA-1 To Ex. 15" RCP DA-2 To SE CB DA-3 Drains Offsite 1L OFFSITE DP-1 Downstream Location Routing Diagram for 2021-1106 Oakdale Gas Station_prePrepared by Freeman Companies, Printed 5/7/2022 HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Subcat Reach Pond Link 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT 2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 2HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (sq-ft) C Description (subcatchment-numbers) 22,275 0.98 Impervious (DA-1, DA-2) 21,785 0.50 Lawn (DA-3) 3,150 0.50 Pervious (DA-1) 47,210 0.73 TOTAL AREA 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 3HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=13,460 sf 76.60% Impervious Runoff Depth=0.54"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.87 Runoff=0.83 cfs 601 cf Runoff Area=11,965 sf 100.00% Impervious Runoff Depth=0.60"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.98 Runoff=0.84 cfs 601 cf Runoff Area=21,785 sf 0.00% Impervious Runoff Depth=0.31"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=0.78 cfs 559 cf Inflow=2.45 cfs 1,760 cfLink 1L: OFFSITE Primary=2.45 cfs 1,760 cf Inflow=1.67 cfs 1,202 cfLink DP-1: Downstream Location Primary=1.67 cfs 1,202 cf Total Runoff Area = 47,210 sf Runoff Volume = 1,760 cf Average Runoff Depth = 0.45" 52.82% Pervious = 24,935 sf 47.18% Impervious = 22,275 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 4HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 0.83 cfs @ 0.10 hrs, Volume= 601 cf, Depth= 0.54" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,120 0.98 Impervious 3,150 0.50 Pervious 13,460 0.87 Weighted Average 3,150 23.40% Pervious Area 10,310 76.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Runoff Area=13,460 sf Runoff Volume=601 cf Runoff Depth=0.54" Tc=6.0 min C=0.87 0.83 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 5HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 0.84 cfs @ 0.10 hrs, Volume= 601 cf, Depth= 0.60" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Area (sf) C Description 11,965 0.98 Impervious 11,965 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Runoff Area=11,965 sf Runoff Volume=601 cf Runoff Depth=0.60" Tc=6.0 min C=0.98 0.84 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 6HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 0.78 cfs @ 0.10 hrs, Volume= 559 cf, Depth= 0.31" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Area (sf) C Description 21,785 0.50 Lawn 21,785 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Runoff Area=21,785 sf Runoff Volume=559 cf Runoff Depth=0.31" Tc=6.0 min C=0.50 0.78 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 7HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 47.18% Impervious, Inflow Depth = 0.45" for 2-yr event Inflow = 2.45 cfs @ 0.10 hrs, Volume= 1,760 cf Primary = 2.45 cfs @ 0.10 hrs, Volume= 1,760 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)2 1 0 Inflow Area=47,210 sf2.45 cfs 2.45 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 8HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Downstream Location Inflow Area = 25,425 sf, 87.61% Impervious, Inflow Depth = 0.57" for 2-yr event Inflow = 1.67 cfs @ 0.10 hrs, Volume= 1,202 cf Primary = 1.67 cfs @ 0.10 hrs, Volume= 1,202 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Downstream Location Inflow Primary Hydrograph Time (hours)3210Flow (cfs)1 0 Inflow Area=25,425 sf1.67 cfs 1.67 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 9HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=13,460 sf 76.60% Impervious Runoff Depth=0.79"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.87 Runoff=1.24 cfs 891 cf Runoff Area=11,965 sf 100.00% Impervious Runoff Depth=0.89"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.98 Runoff=1.24 cfs 892 cf Runoff Area=21,785 sf 0.00% Impervious Runoff Depth=0.46"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=1.15 cfs 829 cf Inflow=3.63 cfs 2,611 cfLink 1L: OFFSITE Primary=3.63 cfs 2,611 cf Inflow=2.48 cfs 1,783 cfLink DP-1: Downstream Location Primary=2.48 cfs 1,783 cf Total Runoff Area = 47,210 sf Runoff Volume = 2,611 cf Average Runoff Depth = 0.66" 52.82% Pervious = 24,935 sf 47.18% Impervious = 22,275 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 10HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 1.24 cfs @ 0.10 hrs, Volume= 891 cf, Depth= 0.79" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,120 0.98 Impervious 3,150 0.50 Pervious 13,460 0.87 Weighted Average 3,150 23.40% Pervious Area 10,310 76.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Runoff Area=13,460 sf Runoff Volume=891 cf Runoff Depth=0.79" Tc=6.0 min C=0.87 1.24 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 11HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 1.24 cfs @ 0.10 hrs, Volume= 892 cf, Depth= 0.89" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Area (sf) C Description 11,965 0.98 Impervious 11,965 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Runoff Area=11,965 sf Runoff Volume=892 cf Runoff Depth=0.89" Tc=6.0 min C=0.98 1.24 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 12HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 1.15 cfs @ 0.10 hrs, Volume= 829 cf, Depth= 0.46" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Area (sf) C Description 21,785 0.50 Lawn 21,785 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Runoff Area=21,785 sf Runoff Volume=829 cf Runoff Depth=0.46" Tc=6.0 min C=0.50 1.15 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 13HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 47.18% Impervious, Inflow Depth = 0.66" for 10-yr event Inflow = 3.63 cfs @ 0.10 hrs, Volume= 2,611 cf Primary = 3.63 cfs @ 0.10 hrs, Volume= 2,611 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)4 3 2 1 0 Inflow Area=47,210 sf3.63 cfs 3.63 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 14HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Downstream Location Inflow Area = 25,425 sf, 87.61% Impervious, Inflow Depth = 0.84" for 10-yr event Inflow = 2.48 cfs @ 0.10 hrs, Volume= 1,783 cf Primary = 2.48 cfs @ 0.10 hrs, Volume= 1,783 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Downstream Location Inflow Primary Hydrograph Time (hours)3210Flow (cfs)2 1 0 Inflow Area=25,425 sf2.48 cfs 2.48 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 15HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=13,460 sf 76.60% Impervious Runoff Depth=0.95"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.87 Runoff=1.49 cfs 1,071 cf Runoff Area=11,965 sf 100.00% Impervious Runoff Depth=1.08"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.98 Runoff=1.49 cfs 1,072 cf Runoff Area=21,785 sf 0.00% Impervious Runoff Depth=0.55"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=1.38 cfs 996 cf Inflow=4.36 cfs 3,139 cfLink 1L: OFFSITE Primary=4.36 cfs 3,139 cf Inflow=2.98 cfs 2,143 cfLink DP-1: Downstream Location Primary=2.98 cfs 2,143 cf Total Runoff Area = 47,210 sf Runoff Volume = 3,139 cf Average Runoff Depth = 0.80" 52.82% Pervious = 24,935 sf 47.18% Impervious = 22,275 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 16HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 1.49 cfs @ 0.10 hrs, Volume= 1,071 cf, Depth= 0.95" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,120 0.98 Impervious 3,150 0.50 Pervious 13,460 0.87 Weighted Average 3,150 23.40% Pervious Area 10,310 76.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Runoff Area=13,460 sf Runoff Volume=1,071 cf Runoff Depth=0.95" Tc=6.0 min C=0.87 1.49 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 17HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 1.49 cfs @ 0.10 hrs, Volume= 1,072 cf, Depth= 1.08" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Area (sf) C Description 11,965 0.98 Impervious 11,965 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Runoff Area=11,965 sf Runoff Volume=1,072 cf Runoff Depth=1.08" Tc=6.0 min C=0.98 1.49 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 18HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 1.38 cfs @ 0.10 hrs, Volume= 996 cf, Depth= 0.55" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Area (sf) C Description 21,785 0.50 Lawn 21,785 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Runoff Area=21,785 sf Runoff Volume=996 cf Runoff Depth=0.55" Tc=6.0 min C=0.50 1.38 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 19HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 47.18% Impervious, Inflow Depth = 0.80" for 25-yr event Inflow = 4.36 cfs @ 0.10 hrs, Volume= 3,139 cf Primary = 4.36 cfs @ 0.10 hrs, Volume= 3,139 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)4 3 2 1 0 Inflow Area=47,210 sf4.36 cfs 4.36 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 20HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Downstream Location Inflow Area = 25,425 sf, 87.61% Impervious, Inflow Depth = 1.01" for 25-yr event Inflow = 2.98 cfs @ 0.10 hrs, Volume= 2,143 cf Primary = 2.98 cfs @ 0.10 hrs, Volume= 2,143 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Downstream Location Inflow Primary Hydrograph Time (hours)3210Flow (cfs)3 2 1 0 Inflow Area=25,425 sf2.98 cfs 2.98 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 21HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=13,460 sf 76.60% Impervious Runoff Depth=1.08"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.87 Runoff=1.68 cfs 1,210 cf Runoff Area=11,965 sf 100.00% Impervious Runoff Depth=1.22"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.98 Runoff=1.68 cfs 1,212 cf Runoff Area=21,785 sf 0.00% Impervious Runoff Depth=0.62"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=1.56 cfs 1,126 cf Inflow=4.93 cfs 3,548 cfLink 1L: OFFSITE Primary=4.93 cfs 3,548 cf Inflow=3.36 cfs 2,422 cfLink DP-1: Downstream Location Primary=3.36 cfs 2,422 cf Total Runoff Area = 47,210 sf Runoff Volume = 3,548 cf Average Runoff Depth = 0.90" 52.82% Pervious = 24,935 sf 47.18% Impervious = 22,275 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 22HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 1.68 cfs @ 0.10 hrs, Volume= 1,210 cf, Depth= 1.08" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,120 0.98 Impervious 3,150 0.50 Pervious 13,460 0.87 Weighted Average 3,150 23.40% Pervious Area 10,310 76.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Runoff Area=13,460 sf Runoff Volume=1,210 cf Runoff Depth=1.08" Tc=6.0 min C=0.87 1.68 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 23HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 1.68 cfs @ 0.10 hrs, Volume= 1,212 cf, Depth= 1.22" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Area (sf) C Description 11,965 0.98 Impervious 11,965 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Runoff Area=11,965 sf Runoff Volume=1,212 cf Runoff Depth=1.22" Tc=6.0 min C=0.98 1.68 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 24HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 1.56 cfs @ 0.10 hrs, Volume= 1,126 cf, Depth= 0.62" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Area (sf) C Description 21,785 0.50 Lawn 21,785 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Runoff Area=21,785 sf Runoff Volume=1,126 cf Runoff Depth=0.62" Tc=6.0 min C=0.50 1.56 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 25HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 47.18% Impervious, Inflow Depth = 0.90" for 50-yr event Inflow = 4.93 cfs @ 0.10 hrs, Volume= 3,548 cf Primary = 4.93 cfs @ 0.10 hrs, Volume= 3,548 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)5 4 3 2 1 0 Inflow Area=47,210 sf4.93 cfs 4.93 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 26HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Downstream Location Inflow Area = 25,425 sf, 87.61% Impervious, Inflow Depth = 1.14" for 50-yr event Inflow = 3.36 cfs @ 0.10 hrs, Volume= 2,422 cf Primary = 3.36 cfs @ 0.10 hrs, Volume= 2,422 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Downstream Location Inflow Primary Hydrograph Time (hours)3210Flow (cfs)3 2 1 0 Inflow Area=25,425 sf3.36 cfs 3.36 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 27HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=13,460 sf 76.60% Impervious Runoff Depth=1.21"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.87 Runoff=1.88 cfs 1,355 cf Runoff Area=11,965 sf 100.00% Impervious Runoff Depth=1.36"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.98 Runoff=1.88 cfs 1,357 cf Runoff Area=21,785 sf 0.00% Impervious Runoff Depth=0.69"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=1.75 cfs 1,261 cf Inflow=5.52 cfs 3,973 cfLink 1L: OFFSITE Primary=5.52 cfs 3,973 cf Inflow=3.77 cfs 2,712 cfLink DP-1: Downstream Location Primary=3.77 cfs 2,712 cf Total Runoff Area = 47,210 sf Runoff Volume = 3,973 cf Average Runoff Depth = 1.01" 52.82% Pervious = 24,935 sf 47.18% Impervious = 22,275 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 28HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 1.88 cfs @ 0.10 hrs, Volume= 1,355 cf, Depth= 1.21" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,120 0.98 Impervious 3,150 0.50 Pervious 13,460 0.87 Weighted Average 3,150 23.40% Pervious Area 10,310 76.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Runoff Area=13,460 sf Runoff Volume=1,355 cf Runoff Depth=1.21" Tc=6.0 min C=0.87 1.88 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 29HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 1.88 cfs @ 0.10 hrs, Volume= 1,357 cf, Depth= 1.36" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Area (sf) C Description 11,965 0.98 Impervious 11,965 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Runoff Area=11,965 sf Runoff Volume=1,357 cf Runoff Depth=1.36" Tc=6.0 min C=0.98 1.88 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 30HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 1.75 cfs @ 0.10 hrs, Volume= 1,261 cf, Depth= 0.69" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Area (sf) C Description 21,785 0.50 Lawn 21,785 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Runoff Area=21,785 sf Runoff Volume=1,261 cf Runoff Depth=0.69" Tc=6.0 min C=0.50 1.75 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 31HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 47.18% Impervious, Inflow Depth = 1.01" for 100-yr event Inflow = 5.52 cfs @ 0.10 hrs, Volume= 3,973 cf Primary = 5.52 cfs @ 0.10 hrs, Volume= 3,973 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)6 5 4 3 2 1 0 Inflow Area=47,210 sf5.52 cfs 5.52 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_pre Printed 5/7/2022Prepared by Freeman Companies Page 32HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Downstream Location Inflow Area = 25,425 sf, 87.61% Impervious, Inflow Depth = 1.28" for 100-yr event Inflow = 3.77 cfs @ 0.10 hrs, Volume= 2,712 cf Primary = 3.77 cfs @ 0.10 hrs, Volume= 2,712 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Downstream Location Inflow Primary Hydrograph Time (hours)3210Flow (cfs)4 3 2 1 0 Inflow Area=25,425 sf3.77 cfs 3.77 cfs DA-1 To Ex. 15" RCP DA-2 To SE CB DA-3 Drains Offsite 1L OFFSITE DP-1 Stormwater Management System Routing Diagram for 2021-1106 Oakdale Gas Station_postPrepared by Freeman Companies, Printed 5/7/2022 HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Subcat Reach Pond Link 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT 2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 2HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (sq-ft) C Description (subcatchment-numbers) 21,575 0.98 Impervious (DA-1, DA-2) 21,575 0.50 Lawn (DA-3) 4,060 0.50 Pervious (DA-1, DA-2) 47,210 0.72 TOTAL AREA 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 3HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=14,890 sf 74.41% Impervious Runoff Depth=0.53"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.86 Runoff=0.91 cfs 657 cf Runoff Area=10,745 sf 97.67% Impervious Runoff Depth=0.60"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.97 Runoff=0.74 cfs 534 cf Runoff Area=21,575 sf 0.00% Impervious Runoff Depth=0.31"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=0.77 cfs 553 cf Inflow=2.42 cfs 1,744 cfLink 1L: OFFSITE Primary=2.42 cfs 1,744 cf Inflow=1.65 cfs 1,191 cfLink DP-1: Stormwater Management System Primary=1.65 cfs 1,191 cf Total Runoff Area = 47,210 sf Runoff Volume = 1,744 cf Average Runoff Depth = 0.44" 54.30% Pervious = 25,635 sf 45.70% Impervious = 21,575 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 4HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 0.91 cfs @ 0.10 hrs, Volume= 657 cf, Depth= 0.53" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,890 0.98 Impervious 3,810 0.50 Pervious 14,890 0.86 Weighted Average 3,810 25.59% Pervious Area 11,080 74.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Runoff Area=14,890 sf Runoff Volume=657 cf Runoff Depth=0.53" Tc=6.0 min C=0.86 0.91 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 5HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 0.74 cfs @ 0.10 hrs, Volume= 534 cf, Depth= 0.60" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Area (sf) C Description 10,495 0.98 Impervious 250 0.50 Pervious 10,745 0.97 Weighted Average 250 2.33% Pervious Area 10,495 97.67% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Runoff Area=10,745 sf Runoff Volume=534 cf Runoff Depth=0.60" Tc=6.0 min C=0.97 0.74 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 6HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 0.77 cfs @ 0.10 hrs, Volume= 553 cf, Depth= 0.31" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Area (sf) C Description 21,575 0.50 Lawn 21,575 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr Runoff Area=21,575 sf Runoff Volume=553 cf Runoff Depth=0.31" Tc=6.0 min C=0.50 0.77 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 7HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 45.70% Impervious, Inflow Depth = 0.44" for 2-yr event Inflow = 2.42 cfs @ 0.10 hrs, Volume= 1,744 cf Primary = 2.42 cfs @ 0.10 hrs, Volume= 1,744 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)2 1 0 Inflow Area=47,210 sf2.42 cfs 2.42 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 2-yr Duration=12 min, Inten=3.08 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 8HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Stormwater Management System Inflow Area = 25,635 sf, 84.16% Impervious, Inflow Depth = 0.56" for 2-yr event Inflow = 1.65 cfs @ 0.10 hrs, Volume= 1,191 cf Primary = 1.65 cfs @ 0.10 hrs, Volume= 1,191 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Stormwater Management System Inflow Primary Hydrograph Time (hours)3210Flow (cfs)1 0 Inflow Area=25,635 sf1.65 cfs 1.65 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 9HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=14,890 sf 74.41% Impervious Runoff Depth=0.79"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.86 Runoff=1.35 cfs 974 cf Runoff Area=10,745 sf 97.67% Impervious Runoff Depth=0.89"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.97 Runoff=1.10 cfs 793 cf Runoff Area=21,575 sf 0.00% Impervious Runoff Depth=0.46"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=1.14 cfs 821 cf Inflow=3.59 cfs 2,588 cfLink 1L: OFFSITE Primary=3.59 cfs 2,588 cf Inflow=2.45 cfs 1,767 cfLink DP-1: Stormwater Management System Primary=2.45 cfs 1,767 cf Total Runoff Area = 47,210 sf Runoff Volume = 2,588 cf Average Runoff Depth = 0.66" 54.30% Pervious = 25,635 sf 45.70% Impervious = 21,575 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 10HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 1.35 cfs @ 0.10 hrs, Volume= 974 cf, Depth= 0.79" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,890 0.98 Impervious 3,810 0.50 Pervious 14,890 0.86 Weighted Average 3,810 25.59% Pervious Area 11,080 74.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Runoff Area=14,890 sf Runoff Volume=974 cf Runoff Depth=0.79" Tc=6.0 min C=0.86 1.35 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 11HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 1.10 cfs @ 0.10 hrs, Volume= 793 cf, Depth= 0.89" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Area (sf) C Description 10,495 0.98 Impervious 250 0.50 Pervious 10,745 0.97 Weighted Average 250 2.33% Pervious Area 10,495 97.67% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Runoff Area=10,745 sf Runoff Volume=793 cf Runoff Depth=0.89" Tc=6.0 min C=0.97 1.10 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 12HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 1.14 cfs @ 0.10 hrs, Volume= 821 cf, Depth= 0.46" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Area (sf) C Description 21,575 0.50 Lawn 21,575 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr Runoff Area=21,575 sf Runoff Volume=821 cf Runoff Depth=0.46" Tc=6.0 min C=0.50 1.14 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 13HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 45.70% Impervious, Inflow Depth = 0.66" for 10-yr event Inflow = 3.59 cfs @ 0.10 hrs, Volume= 2,588 cf Primary = 3.59 cfs @ 0.10 hrs, Volume= 2,588 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)4 3 2 1 0 Inflow Area=47,210 sf3.59 cfs 3.59 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 10-yr Duration=12 min, Inten=4.56 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 14HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Stormwater Management System Inflow Area = 25,635 sf, 84.16% Impervious, Inflow Depth = 0.83" for 10-yr event Inflow = 2.45 cfs @ 0.10 hrs, Volume= 1,767 cf Primary = 2.45 cfs @ 0.10 hrs, Volume= 1,767 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Stormwater Management System Inflow Primary Hydrograph Time (hours)3210Flow (cfs)2 1 0 Inflow Area=25,635 sf2.45 cfs 2.45 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 15HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=14,890 sf 74.41% Impervious Runoff Depth=0.94"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.86 Runoff=1.63 cfs 1,171 cf Runoff Area=10,745 sf 97.67% Impervious Runoff Depth=1.06"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.97 Runoff=1.32 cfs 953 cf Runoff Area=21,575 sf 0.00% Impervious Runoff Depth=0.55"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=1.37 cfs 986 cf Inflow=4.32 cfs 3,111 cfLink 1L: OFFSITE Primary=4.32 cfs 3,111 cf Inflow=2.95 cfs 2,124 cfLink DP-1: Stormwater Management System Primary=2.95 cfs 2,124 cf Total Runoff Area = 47,210 sf Runoff Volume = 3,111 cf Average Runoff Depth = 0.79" 54.30% Pervious = 25,635 sf 45.70% Impervious = 21,575 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 16HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 1.63 cfs @ 0.10 hrs, Volume= 1,171 cf, Depth= 0.94" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,890 0.98 Impervious 3,810 0.50 Pervious 14,890 0.86 Weighted Average 3,810 25.59% Pervious Area 11,080 74.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Runoff Area=14,890 sf Runoff Volume=1,171 cf Runoff Depth=0.94" Tc=6.0 min C=0.86 1.63 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 17HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 1.32 cfs @ 0.10 hrs, Volume= 953 cf, Depth= 1.06" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Area (sf) C Description 10,495 0.98 Impervious 250 0.50 Pervious 10,745 0.97 Weighted Average 250 2.33% Pervious Area 10,495 97.67% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Runoff Area=10,745 sf Runoff Volume=953 cf Runoff Depth=1.06" Tc=6.0 min C=0.97 1.32 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 18HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 1.37 cfs @ 0.10 hrs, Volume= 986 cf, Depth= 0.55" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Area (sf) C Description 21,575 0.50 Lawn 21,575 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr Runoff Area=21,575 sf Runoff Volume=986 cf Runoff Depth=0.55" Tc=6.0 min C=0.50 1.37 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 19HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 45.70% Impervious, Inflow Depth = 0.79" for 25-yr event Inflow = 4.32 cfs @ 0.10 hrs, Volume= 3,111 cf Primary = 4.32 cfs @ 0.10 hrs, Volume= 3,111 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)4 3 2 1 0 Inflow Area=47,210 sf4.32 cfs 4.32 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 25-yr Duration=12 min, Inten=5.49 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 20HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Stormwater Management System Inflow Area = 25,635 sf, 84.16% Impervious, Inflow Depth = 0.99" for 25-yr event Inflow = 2.95 cfs @ 0.10 hrs, Volume= 2,124 cf Primary = 2.95 cfs @ 0.10 hrs, Volume= 2,124 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Stormwater Management System Inflow Primary Hydrograph Time (hours)3210Flow (cfs)3 2 1 0 Inflow Area=25,635 sf2.95 cfs 2.95 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 21HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=14,890 sf 74.41% Impervious Runoff Depth=1.07"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.86 Runoff=1.84 cfs 1,323 cf Runoff Area=10,745 sf 97.67% Impervious Runoff Depth=1.20"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.97 Runoff=1.50 cfs 1,077 cf Runoff Area=21,575 sf 0.00% Impervious Runoff Depth=0.62"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=1.55 cfs 1,115 cf Inflow=4.88 cfs 3,515 cfLink 1L: OFFSITE Primary=4.88 cfs 3,515 cf Inflow=3.33 cfs 2,400 cfLink DP-1: Stormwater Management System Primary=3.33 cfs 2,400 cf Total Runoff Area = 47,210 sf Runoff Volume = 3,515 cf Average Runoff Depth = 0.89" 54.30% Pervious = 25,635 sf 45.70% Impervious = 21,575 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 22HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 1.84 cfs @ 0.10 hrs, Volume= 1,323 cf, Depth= 1.07" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,890 0.98 Impervious 3,810 0.50 Pervious 14,890 0.86 Weighted Average 3,810 25.59% Pervious Area 11,080 74.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Runoff Area=14,890 sf Runoff Volume=1,323 cf Runoff Depth=1.07" Tc=6.0 min C=0.86 1.84 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 23HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 1.50 cfs @ 0.10 hrs, Volume= 1,077 cf, Depth= 1.20" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Area (sf) C Description 10,495 0.98 Impervious 250 0.50 Pervious 10,745 0.97 Weighted Average 250 2.33% Pervious Area 10,495 97.67% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Runoff Area=10,745 sf Runoff Volume=1,077 cf Runoff Depth=1.20" Tc=6.0 min C=0.97 1.50 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 24HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 1.55 cfs @ 0.10 hrs, Volume= 1,115 cf, Depth= 0.62" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Area (sf) C Description 21,575 0.50 Lawn 21,575 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr Runoff Area=21,575 sf Runoff Volume=1,115 cf Runoff Depth=0.62" Tc=6.0 min C=0.50 1.55 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 25HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 45.70% Impervious, Inflow Depth = 0.89" for 50-yr event Inflow = 4.88 cfs @ 0.10 hrs, Volume= 3,515 cf Primary = 4.88 cfs @ 0.10 hrs, Volume= 3,515 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)5 4 3 2 1 0 Inflow Area=47,210 sf4.88 cfs 4.88 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 50-yr Duration=12 min, Inten=6.20 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 26HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Stormwater Management System Inflow Area = 25,635 sf, 84.16% Impervious, Inflow Depth = 1.12" for 50-yr event Inflow = 3.33 cfs @ 0.10 hrs, Volume= 2,400 cf Primary = 3.33 cfs @ 0.10 hrs, Volume= 2,400 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Stormwater Management System Inflow Primary Hydrograph Time (hours)3210Flow (cfs)3 2 1 0 Inflow Area=25,635 sf3.33 cfs 3.33 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 27HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points Runoff by Rational method, Rise/Fall=1.0/1.0 xTc Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=14,890 sf 74.41% Impervious Runoff Depth=1.19"Subcatchment DA-1: To Ex. 15" RCP Tc=6.0 min C=0.86 Runoff=2.06 cfs 1,482 cf Runoff Area=10,745 sf 97.67% Impervious Runoff Depth=1.35"Subcatchment DA-2: To SE CB Tc=6.0 min C=0.97 Runoff=1.68 cfs 1,206 cf Runoff Area=21,575 sf 0.00% Impervious Runoff Depth=0.69"Subcatchment DA-3: Drains Offsite Tc=6.0 min C=0.50 Runoff=1.73 cfs 1,248 cf Inflow=5.47 cfs 3,937 cfLink 1L: OFFSITE Primary=5.47 cfs 3,937 cf Inflow=3.73 cfs 2,688 cfLink DP-1: Stormwater Management System Primary=3.73 cfs 2,688 cf Total Runoff Area = 47,210 sf Runoff Volume = 3,937 cf Average Runoff Depth = 1.00" 54.30% Pervious = 25,635 sf 45.70% Impervious = 21,575 sf 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 28HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-1: To Ex. 15" RCP Runoff = 2.06 cfs @ 0.10 hrs, Volume= 1,482 cf, Depth= 1.19" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Area (sf) C Description 2,190 0.98 Impervious 8,890 0.98 Impervious 3,810 0.50 Pervious 14,890 0.86 Weighted Average 3,810 25.59% Pervious Area 11,080 74.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment DA-1: To Ex. 15" RCP Runoff Hydrograph Time (hours) 3210Flow (cfs)2 1 0 CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Runoff Area=14,890 sf Runoff Volume=1,482 cf Runoff Depth=1.19" Tc=6.0 min C=0.86 2.06 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 29HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-2: To SE CB Runoff = 1.68 cfs @ 0.10 hrs, Volume= 1,206 cf, Depth= 1.35" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Area (sf) C Description 10,495 0.98 Impervious 250 0.50 Pervious 10,745 0.97 Weighted Average 250 2.33% Pervious Area 10,495 97.67% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-2: To SE CB Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Runoff Area=10,745 sf Runoff Volume=1,206 cf Runoff Depth=1.35" Tc=6.0 min C=0.97 1.68 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 30HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment DA-3: Drains Offsite HSG B Runoff = 1.73 cfs @ 0.10 hrs, Volume= 1,248 cf, Depth= 0.69" Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Area (sf) C Description 21,575 0.50 Lawn 21,575 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Entry Subcatchment DA-3: Drains Offsite Runoff Hydrograph Time (hours) 3210Flow (cfs)1 0 CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr Runoff Area=21,575 sf Runoff Volume=1,248 cf Runoff Depth=0.69" Tc=6.0 min C=0.50 1.73 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 31HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link 1L: OFFSITE Inflow Area = 47,210 sf, 45.70% Impervious, Inflow Depth = 1.00" for 100-yr event Inflow = 5.47 cfs @ 0.10 hrs, Volume= 3,937 cf Primary = 5.47 cfs @ 0.10 hrs, Volume= 3,937 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link 1L: OFFSITE Inflow Primary Hydrograph Time (hours)3210Flow (cfs)6 5 4 3 2 1 0 Inflow Area=47,210 sf5.47 cfs 5.47 cfs 2021-1106 612 Norwich-Salem Tnpke, Oakdale CT CT-Norwich 100-yr Duration=12 min, Inten=6.94 in/hr2021-1106 Oakdale Gas Station_post Printed 5/7/2022Prepared by Freeman Companies Page 32HydroCAD® 10.00-25 s/n 06399 © 2019 HydroCAD Software Solutions LLC Summary for Link DP-1: Stormwater Management System Inflow Area = 25,635 sf, 84.16% Impervious, Inflow Depth = 1.26" for 100-yr event Inflow = 3.73 cfs @ 0.10 hrs, Volume= 2,688 cf Primary = 3.73 cfs @ 0.10 hrs, Volume= 2,688 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Link DP-1: Stormwater Management System Inflow Primary Hydrograph Time (hours)3210Flow (cfs)4 3 2 1 0 Inflow Area=25,635 sf3.73 cfs 3.73 cfs This page intentionally left blank.