Stormwater Management Plan 3 Hubbard Road Wilton, Connecticut

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ENGINEERING REPORT

STORMWATER MANAGEMENT PLAN 3 HUBBARD ROAD WILTON, CONNECTICUT

January 20, 2020

Prepared for:

3 Hubbard Road, LLC PO Box 692 South Norwalk, CT 06856

Prepared By:

Ricardo Ceballos, P.E. Professional Engineering Consulting Services 245 Sturges Highway Westport, CT 06880 (203)635-0922 STORMWATER MANAGEMENT PLAN 3 Hubbard Road Wilton, CT

PROJECT DESCRIPTION

The descriptions and computations included within this Stormwater Management Plan and Appendix are provided in support of applications submitted by 3 Hubbard Road, LLC to the various regulatory agencies for permitting purposes. Since the property is tied into the Town’s street drainage system, and there are changes in coverage of the existing property, the site's Storm water runoff system shall be sized to accommodate runoff from a 25-year design storm and the system shall be designed so as to prevent runoff from parking lots, roofs, and access drives from flowing into the street. Per Town requirements, the storm water management plan has been prepared by a Connecticut-licensed professional engineer.

Location

The project site is located at 3 Hubbard Road, Wilton, Connecticut (site); As shown in Figure 1 the site is located in the Wilton Center District. The 1.27-acre site is a fully developed urban area with vegetation established.

Figure 1 Project Location - 3 Hubbard Road, Wilton, CT.

Page 2 Existing Conditions

The site has an existing apartment building built in 1943. The impervious area created by the existing building is 6,267 square feet. Other impervious areas in the property include driveways and parking areas, a patio, and access sidewalks. The site’s open space are landscaped grass areas, and a woods area with slopes over 30%. The purpose of the proposed project is to build an additional three story high residential building with 17 units. The new building will be located in the existing woods area of the property and there will not be any other permanent modification to pervious or impervious areas on the site.

There are three separate watersheds (WS) in the property. As shown on Appendix A, WS-1 covers most of the rear of the property, West side. WS-1 includes a portion of the existing building, a patio, grass areas, driveways, parking areas, and wood areas; there is an existing on-site stormwater drain system that discharges to the Town’s drain system on Old Ridgefield Road. WS-2 is a smaller area also in the back of the property and it is all wood areas. The front of the property is WS-3 and there are no proposed permanent modification or changes to the pervious or impervious areas in this watershed. WS-3 drains East to the Town’s street drainage system on Hubbard Road.

Based upon FEMA’s Flood Insurance Rate Map (FIRM) Map number 09001C0383F for Fairfield County, effective date June 18, 2010, the site is located entirely within Zone X, an area determined to be outside the 0.2% annual chance floodplain (See Appendix C).

According to the Soil Survey of Fairfield County, the site’s soil type where the building will be Located and where the storm water management infiltration system will be installed is entirely Charlton-Chatfield complex, 15 to 45% slopes, very rocky land complex with a “well drained” natural drainage classification. Charlton soils belong to soil group B (See Appendix D). There are no wetlands or surface water bodies on site. Groundwater in the area is classified with a GA ground water quality class. The water quality classes are based on the “Water Quality Classification Norwalk, CT” map prepared by CT DEEP dated November 2015 (See Appendix E).

Proposed Project

The proposed stormwater management system for this project is designed to collect and direct runoff to a subsurface infiltration system. The system will provide infiltration, temporary storage of runoff, reduction of post development peak discharge rates, and meet groundwater recharge volume and pollutant reduction requirements. The system has been designed in accordance with the Town of Wilton Zoning Regulations, and the guidelines and procedures set forth in the 2004 Connecticut Storm Quality Manual.

The proposed development will impact WS-1 and WS-2 (Appendix B). The required grading and new building will modify the size of the watersheds and will increase the size of the impervious areas. The proposed WS-1 is 80% impervious (paved parking lot, roofs, etc.). The proposed stormwater management system includes a 12” storm pipe overflow that connects to the existing 12” storm drain in the parking lot. The existing system discharges on the North side of the property into the municipal storm sewer network. The proposed and existing 12” drains are sized to convey the peak runoff discharge of the 25-year storm. Details of the size and location of the stormwater management system can be found on drawing GD-1 of the design plans.

Based on our experience, soils group B throughout the Town of Wilton are very well drained with a typical percolation rate of 5-10 mpi (minutes per inch). Owner shall perform a percolation test during construction to verify site conditions.

Page 3 The system has been designed to provide infiltration of the first inch of runoff, removing at least 80% of the average annual total suspended solids (TSS) load, removing at least 80% of floatable debris, providing peak runoff rate attenuation, and volume attenuation to improve the existing site hydrology, as well as to minimize sediment transport.

The area of the proposed WS-2 is about 50% smaller than the WS-2 area under existing conditions.

PEAK RUNOFF CALCULATIONS

Calculations for the existing and proposed conditions were analyzed using the US Department of Agriculture Natural Resources Conservation Service (NRCS, Formerly known as the Soil Conservation Service or SCS) TR-55 methodology which outlines procedures for calculating storm runoff volume, peak rate of discharge, and hydrographs on small watersheds. To complement the design results, the method utilized to predict the surface water runoff rate in this analysis and the impact of the proposed infiltration/detention system is a computer program entitled Hydraflow Hydrographs Extension for AutoCAD Civil 3D 2020. The Hydrographs computer modeling program utilizes the same methods for computing runoff rates that were originally developed by the US Department of Agriculture NRCS, and they are also utilized in the TR-20 computer modeling program and others. Calculations are included in Appendix F.

The runoff curve number is a land sensitive coefficient that dictates the relationship between total rainfall depth and direct storm runoff. The site as stated before is mostly fully developed urban area with paved parking lots, roofs, and driveways.

The time of concentration (Tc) is defined as the time for runoff to travel from the hydraulically most distant point in the watershed to a point of interest. Values of time of concentration were determined for both conditions based on land cover and slope of the flow path using methods outlined in TR-55. Considering the steep slopes, a time of concentration of 0.1 hours was used.

For this study, all rainfall depth and rainfall intensity were obtained from the National Oceanic and Atmospheric Administration (NOAA) Weather Service Hydrometeorological Design Studies Center Precipitation Frequency Data Server (PDFS). Enclosed for reference is a copy of the downloaded NOAA Atlas 14 table for rainfall depth and rainfall intensity (See Appendix G).

The peak flow and total runoff volume were determined for all frequency storms analyzed. The total runoff volumes, and peak flows are summarized below:

Table 1 Site Runoff Volume (cf) Comparison for WS-1

Storm Frequency Existing Conditions Proposed Conditions % decrease Runoff Volume (cf) Runoff Volume (cf) 1-Year 4471 3300 -26% 2-Year 5810 4800 -17% 5-Year 8087 7383 -9% 10-Year 9973 9543 -4% 25-Year 12627 12600 -0.21%

Page 4 Table 2 Site Peak Discharge (cfs) Comparison for WS-1

Storm Frequency Existing Conditions Proposed Conditions % decrease Peak Discharge (cfs) Peak Discharge (cfs) 1-Year 1.94 1.21 -38% 2-Year 2.53 2.04 -19% 5-Year 3.52 2.54 -28% 10-Year 4.34 3.18 -27% 25-Year 5.49 4.06 -26%

Table 3 Site Runoff Volume (cf) Comparison for WS-2

Storm Frequency Existing Conditions Proposed Conditions % decrease Runoff Volume (cf) Runoff Volume (cf) 1-Year 671 141 -79% 2-Year 247999 247 -75% 5-Year 1611 467 -71% 10-Year 2154 677 -69% 25-Year 2953 1003 -66%

Table 4 Site Peak Discharge (cfs) Comparison for WS-2

Storm Frequency Existing Conditions Proposed Conditions % decrease Peak Discharge (cfs) Peak Discharge (cfs) 1-Year 0.28 0.04 -84% 2-Year 0.42 0.09 -78% 5-Year 0.68 0.19 -72% 10-Year 0.92 0.28 -70% 25-Year 1.28 0.42 -67%

As shown on the tables above, the reduction of the peak runoff rate and runoff volume off-site in WS-1 is achieved through the implementation of the underground infiltration/detention system which provides temporary storage for runoff. The proposed retention system will be surrounded by 12 inches of stone to provide a stable base and to increase the storage volume.

As stated earlier the size of WS-2 will be decreased by 50%, and replacing wood areas for grass landscaped areas also contributes to the reduction of the peak runoff rate and runoff volume off-site in WS-2.

The underground infiltration/detention system will be located under the parking lot area, and the system capacity is designed to also capture the stormwater runoff generated by the first inch of all rainfall events. The volume of the infiltration system meets the requirements of the groundwater recharge criteria and the pollutant reduction criteria set on the 2004 CTDEEP Stormwater Quality Manual.

Included as Appendix H is a copy of the “Maintenance & Inspection Schedule” which has been prepared for the site to promote good housekeeping measures.

Design plans accompany this report to provide additional design detail regarding the underground storage system proposed.

Page 5

APPENDIX A

C E N

T Town of Wilton, Connecticut - Assessment Parcel Map R E

S MBL: 73-40-2 Address: 3 HUBBARD RD T R E E T O LD R ID GE FI EL D RO AD

Approximate Scale: Disclaimer: Map Grand List Date: Oct 2017 This map is for informational purposes only. 1 inch = 100 feet All information is subject to verification by any user. µ The Town of Wilton and its mapping contractors 0 50 100 150 assume no legal responsibility for the information contained herein. Feet

APPENDIX B

APPENDIX C

National Flood Hazard Layer FIRMette Legend 41°11'50.54"N SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT

W " Without Base Flood Elevation (BFE) 2

5 Zone A, V, A99 .

8 With BFE or Depth Zone AE, AO, AH, VE, AR 1 ' SPECIAL FLOOD 6

2 HAZARD AREAS Regulatory Floodway ° 3 7 0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Zone X Future Conditions 1% Annual Chance Flood Hazard Zone X Area with Reduced Flood Risk due to OTHER AREAS OF Levee. See Notes. Zone X FLOOD HAZARD Area with Flood Risk due to Levee Zone D

NO SCREEN Area of Minimal Flood Hazard Zone X Effective LOMRs

OTHER AREAS Area of Undetermined Flood Hazard Zone D

GENERAL Channel, Culvert, or Storm Sewer STRUCTURES Levee, Dike, or Floodwall

20.2 B Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation

8 Coastal Transect Base Flood Elevation Line (BFE) Limit of Study Jurisdiction Boundary Coastal Transect Baseline OTHER Profile Baseline FEATURES Hydrographic Feature

Digital Data Available

No Digital Data Available MAP PANELS Unmapped Ü

The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location.

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 basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 1/18/2020 at 9:34:47 PM and does not reflect changes or amendments subsequent to this date and 7

3 time. The NFHL and effective information may change or ° 2

5 become superseded by new data over time. ' 4 1 .

0 This map image is void if the one or more of the following map 7

" elements do not appear: basemap imagery, flood zone labels, W

USGS The National Map: Orthoimagery. Data refreshed April, 2019. legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for Feet 1:6,000 41°11'23.47"N unmapped and unmodernized areas cannot be used for 0 250 500 1,000 1,500 2,000 regulatory purposes.

APPENDIX D

United States A product of the National Custom Soil Resource Department of Cooperative Soil Survey, Agriculture a joint effort of the United Report for States Department of Agriculture and other Federal agencies, State State of Natural agencies including the Resources Agricultural Experiment Conservation Stations, and local Connecticut Service participants 3 Hubbard Rd, Wilton CT

January 13, 2020 Preface

Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/ portal/nrcs/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/? cid=nrcs142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require

2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer.

3 Contents

Preface...... 2 How Soil Surveys Are Made...... 5 Soil Map...... 8 Soil Map...... 9 Legend...... 10 Map Unit Legend...... 11 Map Unit Descriptions...... 11 State of Connecticut...... 13 60D—Canton and Charlton soils, 15 to 25 percent slopes...... 13 73E—Charlton-Chatfield complex, 15 to 45 percent slopes, very rocky..... 15 307—Urban land...... 17 References...... 19

4 How Soil Surveys Are Made

Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil

5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil-landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and

6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately.

7 Soil Map

The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit.

8 Custom Soil Resource Report Soil Map 73° 26' 5'' W 73° 25' 59'' W

631260 631280 631300 631320 631340 631360 631380 41° 11' 41'' N 41° 11' 41'' N 4561560 4561560 4561540 4561540 4561520 4561520 4561500 4561500 4561480 4561480 4561460 4561460 4561440 4561440 4561420 4561420 4561400 4561400

Soil Map may not be valid at this scale.

41° 11' 35'' N 4561380 41° 11' 35'' N 631260 631280 631300 631320 631340 631360 631380

Map Scale: 1:899 if printed on A portrait (8.5" x 11") sheet. Meters 73° 26' 5'' W

N 0 10 20 40 60 73° 25' 59'' W Feet 0 40 80 160 240 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 9 Custom Soil Resource Report

MAP LEGEND MAP INFORMATION

Area of Interest (AOI) Spoil Area The soil surveys that comprise your AOI were mapped at Area of Interest (AOI) 1:12,000. Stony Spot Soils Very Stony Spot Soil Map Unit Polygons Warning: Soil Map may not be valid at this scale. Wet Spot Soil Map Unit Lines Enlargement of maps beyond the scale of mapping can cause Other Soil Map Unit Points misunderstanding of the detail of mapping and accuracy of soil Special Line Features line placement. The maps do not show the small areas of Special Point Features contrasting soils that could have been shown at a more detailed Blowout Water Features scale. Streams and Canals Borrow Pit Transportation Please rely on the bar scale on each map sheet for map Clay Spot Rails measurements. Closed Depression Interstate Highways Source of Map: Natural Resources Conservation Service Gravel Pit US Routes Web Soil Survey URL: Gravelly Spot Coordinate System: Web Mercator (EPSG:3857) Major Roads Landfill Local Roads Maps from the Web Soil Survey are based on the Web Mercator Lava Flow projection, which preserves direction and shape but distorts Background distance and area. A projection that preserves area, such as the Marsh or swamp Aerial Photography Albers equal-area conic projection, should be used if more Mine or Quarry accurate calculations of distance or area are required.

Miscellaneous Water This product is generated from the USDA-NRCS certified data as Perennial Water of the version date(s) listed below.

Rock Outcrop Soil Survey Area: State of Connecticut Saline Spot Survey Area Data: Version 19, Sep 13, 2019

Sandy Spot Soil map units are labeled (as space allows) for map scales Severely Eroded Spot 1:50,000 or larger.

Sinkhole Date(s) aerial images were photographed: Dec 31, 2009—Oct 5, Slide or Slip 2016

Sodic Spot 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.

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Map Unit Legend

Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI

60D Canton and Charlton soils, 15 1.4 43.8% to 25 percent slopes 73E Charlton-Chatfield complex, 15 0.7 22.2% to 45 percent slopes, very rocky 307 Urban land 1.1 34.0% Totals for Area of Interest 3.2 100.0%

Map Unit Descriptions

The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or

11 Custom Soil Resource Report

landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example.

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State of Connecticut

60D—Canton and Charlton soils, 15 to 25 percent slopes

Map Unit Setting National map unit symbol: 9lpq Elevation: 0 to 1,200 feet Mean annual precipitation: 43 to 54 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 140 to 185 days Farmland classification: Not prime farmland

Map Unit Composition Canton and similar soils: 45 percent Charlton and similar soils: 35 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Canton Setting Landform: Hills Down-slope shape: Linear Across-slope shape: Convex Parent material: Coarse-loamy over sandy and gravelly melt-out till derived from granite and/or schist and/or gneiss Typical profile Oe - 0 to 1 inches: moderately decomposed plant material A - 1 to 3 inches: gravelly fine sandy loam Bw1 - 3 to 15 inches: gravelly loam Bw2 - 15 to 24 inches: gravelly loam Bw3 - 24 to 30 inches: gravelly loam 2C - 30 to 60 inches: very gravelly loamy sand Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Low 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: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 5.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No

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Description of Charlton Setting Landform: Hills Down-slope shape: Linear Across-slope shape: Linear Parent material: Coarse-loamy melt-out till derived from granite and/or schist and/or gneiss Typical profile Ap - 0 to 4 inches: fine sandy loam Bw1 - 4 to 7 inches: fine sandy loam Bw2 - 7 to 19 inches: fine sandy loam Bw3 - 19 to 27 inches: gravelly fine sandy loam C - 27 to 65 inches: gravelly fine sandy loam Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Low 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: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 5.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No

Minor Components Leicester Percent of map unit: 5 percent Landform: Drainageways, depressions Down-slope shape: Linear Across-slope shape: Concave Hydric soil rating: Yes Chatfield Percent of map unit: 5 percent Landform: Ridges, hills Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No Sutton Percent of map unit: 5 percent Landform: Drainageways, depressions Down-slope shape: Concave Across-slope shape: Linear Hydric soil rating: No

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Hollis Percent of map unit: 5 percent Landform: Hills, ridges Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No

73E—Charlton-Chatfield complex, 15 to 45 percent slopes, very rocky

Map Unit Setting National map unit symbol: 9lql Elevation: 0 to 1,200 feet Mean annual precipitation: 43 to 56 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 140 to 185 days Farmland classification: Not prime farmland

Map Unit Composition Charlton and similar soils: 45 percent Chatfield and similar soils: 30 percent Minor components: 25 percent Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Charlton Setting Landform: Hills Down-slope shape: Linear Across-slope shape: Linear Parent material: Coarse-loamy melt-out till derived from granite and/or schist and/or gneiss Typical profile Ap - 0 to 4 inches: fine sandy loam Bw1 - 4 to 7 inches: fine sandy loam Bw2 - 7 to 19 inches: fine sandy loam Bw3 - 19 to 27 inches: gravelly fine sandy loam C - 27 to 65 inches: gravelly fine sandy loam Properties and qualities Slope: 15 to 45 percent Percent of area covered with surface fragments: 1.6 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well 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: More than 80 inches Frequency of flooding: None

15 Custom Soil Resource Report

Frequency of ponding: None Available water storage in profile: Low (about 5.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Hydric soil rating: No

Description of Chatfield Setting Landform: Ridges, hills Down-slope shape: Convex Across-slope shape: Linear Parent material: Coarse-loamy melt-out till derived from granite and/or schist and/or gneiss Typical profile Oa - 0 to 1 inches: highly decomposed plant material A - 1 to 6 inches: gravelly fine sandy loam Bw1 - 6 to 15 inches: gravelly fine sandy loam Bw2 - 15 to 29 inches: gravelly fine sandy loam 2R - 29 to 80 inches: unweathered bedrock Properties and qualities Slope: 15 to 45 percent Percent of area covered with surface fragments: 1.6 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Natural drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Low to high (0.01 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 3.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Hydric soil rating: No

Minor Components Rock outcrop Percent of map unit: 10 percent Hydric soil rating: No Leicester Percent of map unit: 5 percent Landform: Drainageways, depressions Down-slope shape: Linear Across-slope shape: Concave Hydric soil rating: Yes

16 Custom Soil Resource Report

Sutton Percent of map unit: 5 percent Landform: Drainageways, depressions Down-slope shape: Concave Across-slope shape: Linear Hydric soil rating: No Hollis Percent of map unit: 3 percent Landform: Hills, ridges Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No Unnamed, sandy subsoil Percent of map unit: 1 percent Hydric soil rating: No Unnamed, red parent material Percent of map unit: 1 percent Hydric soil rating: No

307—Urban land

Map Unit Setting National map unit symbol: 9lmh Elevation: 0 to 2,000 feet Mean annual precipitation: 43 to 56 inches Mean annual air temperature: 45 to 55 degrees F Frost-free period: 120 to 185 days Farmland classification: Not prime farmland

Map Unit Composition Urban land: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Urban Land Typical profile H - 0 to 6 inches: material Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8 Hydrologic Soil Group: D Hydric soil rating: Unranked

17 Custom Soil Resource Report

Minor Components Unnamed, undisturbed soils Percent of map unit: 10 percent Hydric soil rating: No Udorthents, wet substratum Percent of map unit: 10 percent Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No

18 References

American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/national/soils/?cid=nrcs142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ home/?cid=nrcs142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/ detail/national/landuse/rangepasture/?cid=stelprdb1043084

19 Custom Soil Resource Report

United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/soils/scientists/?cid=nrcs142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/? cid=nrcs142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf

APPENDIX E

n d ! t R Sturges Ridge Cobbs Mill Pond n Davidge Pond n

! S B L S d h Wilton High School g O Beaver Brook n t a Skunk Pond R d r c d u l Davidge Brook 136 L o l P Weston High School h n R d F O o N d a i SV

i v l G a o n l l H a c ll o H w r i d d D a r t o d e R y r o e w R e l o i an C il t t l l M e o y l r y H d n A s b t l p B H R L e R d l d S r s o e l t d d s R o n D e f L r i o Weston Intermediate School s R i R e Huckleberry Hills Brook d m d W R H Upper Stony Brook Pond L e i b R r e i A p d D g a n v e Ridgefield Pond e a id g b to g M l Country Club Pond d L d i H r l R P r n n l a il d n g e y l i d L o t d a ! i H r tin s R l H d t n S x B Still Pond R a R n Comstock Knoll u d R o C io e L S H r d ad l t F e D tt h Town Pond u e e t r o t e d u k s n a a n le C e n D b c L H g p r t m fo b d t i k it d T Lower Stony Brook Pond o r A F e P n g id H R th e ku t e L n Harrisons Brook R S r o e R S e t D o R r f ll H l ty n d G b s i o i er s l a k r t d d R ib r il le r E r e H w L y d Fanton Hill p d g l Cider Mill School H R l n a L ld e R R s y B ie O T e a i M f w i l s u A d r C l il t n r o a t 3 n n o r d t g r a u g d K r H R L i ! l N o c 3 l R o Hurlbutt Elementary School d d n L S b n s e D o t e n R n d a d O l S ld w r AA n g d t N L o u R p R t R L h e d A r i t a t t i a r W ATER Q UALITY CLAS S IFICATIONS a o n n f e D R t n o l l o m n Middlebrook School t d e d n s E ! l n g a 33 i B n i N w n d r i o id P D o L r W S e S g f a l a e V n n C d l a h e L C L i r S h n n e r e l a le t e b s f L d r F M C ! d g a ie k ien i d l W F e l r i t l a F r r d e n P l a l y d O e n C u o a v e e P n o n O i O s l a W L R w k t b a n s l T t t d l n i o e g a o e W R u R o n r r Hasen Pond n M o C g e d t Strong Pond d B y r R R d g f d H y in t r r a p i Cedar Road Pond r o s L s e s t r c ee r e s o h R i H k C il D s y d r l p s D i R i u r B Pond Road Pond e R o l S s r C d h l o n n d T Aspetuck River L NOR W ALK, CT R t

H d R o l O rn k Saugatuck River Ba R d d B R S ed O A i l R d d d ll R d i r d t d g l H a R P W R i ee D y w s Tr n h do d e ow r r is w t a R ll o r P e e c o r t d H D H M a a n i H P en u o d R f n w r ld o Boone Brook H id l o t l m R L e H r y w n e ta e d O s i n d n v w w d T Hirschs Pond w Ca u a o C H a h d g v R n R E ig P y W E S T O N rt y t u r a

n n A d e i H R s R d P L p 5 B lb r D Bryant Brook n Princes Pond R i D Wilton Station L n r Great Brook Pond S d t 7 i t G d

l S i r p t R Grupes Reservoir r s w a e t r R d r o e D C tt m d K a s a e e o S a i r l o r d o e C n D r O ! S h S e c s p o B c ld s i v Ã S t o e o h s o P t t e D R l C h w v k R D i a n t n s h o d i B g e e Newtown Pond t s d e e w b l e C s e P e y w r L f e L r P e R i r e S UR FACE W ATER Q UALITY CLAS S ES n Ln u a e id m a

e n l e n R d l l r e n d s r d n g e N r Po il c R y e J w l R e m W ye o Cherry Lane Pond o o a t t n

AA e a H d a R e n g h R i T o d W d a o R T R r e o d e n n L b y t k h n r n y r d e i l H n R d l d d o g s C n d d L h R s e G R g C i g e m L k Kettle Creek i d e l r L t e t d O L l d L L n N e u e a L n i R R n n l le e n 106 g n en n R e A A g S L B Gr o v L V d g d S d d E i d D n r l l d d i e E c P t il frey r R e od R c h n Rd h G R e ll r R h Hi H o l d R t l R p ic i Rd D t s ed n L ld Ex R Club Pond d V en fie e ad n B d e n E H i B l op t Ro d F T r r a B J e a AA AA v a r iv a 123 p l Bishop Pond R a R l G a r D O W m d S l e g V e r k m A P i d Huckleberry Hills i a r a l R y v r e d d D o b g f h O e s ls R l R e v

a d e o i r d r H y d R W r S a s n da m r i e d e x r e r y o R C n H n R R

Smith Ridge d L B C e o a L p s

r d R e

o oo i A l y F s e w s l r w e r l P t l n D i s o d e E d w B t L t

B, B* B, B* Vie Kn v i o H y r m W PD l a o g w g o n

M nd Pl e A e R n H i r P o e o la d

Ruscoe Ridge Wood ay r g d s i o m C G d i l v o i R R d

R r n m n d h e c d Rd C C B e n e Ln a r L

h r d e a a h k e T c ive M N L ir t i n R o n A d a u g n r A o n

n M l A P Rock Lake t l e o L a d h n d e e R r in J Pinneys Corners ill g L i r H H n n valry i y a th le Pl SA SA e r Ca H k n m y H d u R b R Silvermine River i a D A a d l o R S d W l u O d Thayers Brook v d H r w T R d R r in e A i V Chestnut Hill Brook y R l h k e t d w R o a c G n a a T Poorhouse Brook u W I L T O N L d D L n l G y R l D n t t e h ay y SB SB e West Branch Saugatuck River r d P R l a W r F A I R F I E L D o y i e d d r a e u d y e R b h R Hicock Pond W Hanson Pond r h y ir P w r n C l l q ro e L a d e Hil o L r rd e d A s e B tewa d o H n k a S R r n R P gan Chestnut Hill L ra la g o n d s L O o d F f r NOTES: in Wi O o w F n o a Rd d d r o e X wn y D w n e Natural Pond ydendo l s H W R a n d Held Pond k s id e n gh R S n r d R g i ive k r u r e o e L H d field t c t P s n S urface W ater Classifications beginning w ith S refer to Coastal and Marine S urface W ater. d R H l R Rd e Dwight Elementary School ie L d L h e S c L L e R r l p d d p k u o o k M n o New Canaan Reservoir a e c o R oo d y R c l n s r u o City Lake e n d d a w e R ! n t w w n o B* is a subset of Class B w here no direct w astew ater discharges are allow ed other than those A P L k Thayers Pond k o s la r g d o d h n e y R c o g b R n G e n w a lle c Pine Hill l R a i w m L i e e e d n r a Dudley Pond e e n l V d y R H n i o r W L C Sasco Brook s M L t e P b p v e R H e r D D I L l d t s y e e g r e d d consistent w ith Class AA, A and S A surface w aters. e S e B i T d e Lit l i l tle L r y t d n S ir y n n s R t d u n r o e y y i c u r u f b e R d r n i AA r D q i C w L r r n r O t a S e L n n r y l i t v d d Far k i u u k i Above Pond t t m Rd p o G l e ern n tt S r l lf r d u a R Ed W e r B P s e R gew o Broad Axe Ln B g i J r ate T oh P r Dr d Rd l R t n M Pine Hill Pond W il We R n nch D e it d a B a m t st ge i Br d D rs G h AA o po d r A y r ha o n rt R Ri n k r t a ll d L i Pl Thrush Ln e d igh ay R T e n s H H dw V L c a o g l n o d d u M s o k n s n L W Coleytown Middle School r n Rippowam River L s n y R C p 124 e i r e L L g L s d S d a s e e i ll L V i K o l Charcoal Hill a Q R D e B i n l R h n a n it Shallow Pond ! L r o u d d n M d F m r l S t Parting Brook l a R o i R e l e w d n r it il D O Gilbert Corners P c n o e d L t h H v k a e r Tilford W Miller School k e y r o D o S l c r GR OUND W ATER Q UALITY CLAS S ES W Smith Ridge l Coleytown Elementary w H e n n I r r o h e L H n n B M D r L l l i a r n it Wilto C r D k t e o n g b o u ! n o C P e b d Trails End Pond te Ac i i o T T Ina E Driscoll School r c res D ro Ln la n Ch h a M r n C ! k s P i s b Lockwood Pond a w ll k m g a d l L u l F t c r r r o e e o o a n E L co a e e n s s n M c e i a n r n e a d n e C n t O n P t o H v n ll l H r L u ! T Clover Pond o k L o V w l L d r i i d West Road Pond e R Cheese Spring Pond r i W a n o B ll i n s e l i y d P O R r i i l l t d c k y d d R n n o l D r r n R B e Old Grumman Pond D Spruce Pond r n y t d l o n L s c L R e o L o o d d ll r n o d it GA (white background) a i h e n g k Turner Hill Pond H t o R l r k t w ry e L c r H C b B i e Dans Hwy e e D g L l Rd o G a Area of Contribution to Public Supply Well R e b w il B d y n k le b H Silver Brook o i k h n a an a w Ferris Hill c t i mm d k R d u y r g Gru P C h

u H R Ln e h n A l y itt C R r a d d o b rr s d d o s s t T e t Q o R s e Cyrgalis Pond e M P e B w a D 57 n e r g d n e h e e o r d S c r r D s J R V o F n a n r g g W t r i o e GAA, GAAs R n r B a n t p y m t Merwins Hill o A g o W Domenicks Pond a a L s n S n O l n L l D C li H r l d R l d le L r e i d a o H n e R e L n e D p e b Copts Brook r R d n W r Belden Hill Doubtful Pond o lu l n R y E s r i s d l V l n C i d F a l i e l e t y u R R r Sayles Pond H d u d n d r l e l R t l e r T o i n g s i n r n d a d L M h g L n R u n c i Fivemile River H d o d ti L W k o Silvermine Pond Huckleberry Pond i w a R Mys C s R n a R n e L i Barker Pond P F D g n n k r e La d e r g m te r Newtown Avenue Pond R L H Laurel Reservoir C e do L r L Fire Pond e d d g n l

GA, GAA may not meet current standards F n g n k R i in n k n R in i t e c L l a 6 Tuttle Pond n K n n i m l O Belden Hill Brook e l o f e r i T r A r i d 3 o d le R d w n Sipperly Hill o i e Crawford Pond r i u l B R r 1 y n hs F n g n d a k k r rt w d L a Saugatuck River P T Kingdom Pond South Wilton o B o o t e o B W o y c a N H T n n Jules Pond d m r T M in Ramho d o ke B e w o d ra rne R R d r i W a V d L h K R r L R GB n s r n e H R t S l y G d a Valeview Rd lv n u f i w S e Chestnut Hill Pond i n il T t n v s y y E n l i H e o S e e l M e r S n o n r e r t z e s p Landscape Pond n n r o a y s rin e Lambert Pond t u b r Ln i a n i o g e D B H l r D R Collins Pond d d R b ee L d C t e a d u R R ls H r y West Hil Hills D Old South Norwalk Reservoir n T t C t p t r Canoe Hill New Canaan Pond N n li R e S a Q t t G s New Canaan Rd u l B r d L T i l C d i il a n l a r e n n e l y d L l r H L u r m i L O L s n n v e AA w s GC r D e i a e d y e n L o n r T o r L k n l C n n a v L a O Rosebrook Pond s a r L M W L C D o n n u i R W e e o n r

u l Tulip Tree Pond o d l r i s a r Qu Field Pond L art G D t e er d l M e i n ile Rd e l c i r y l Exit 41 r K n W e m e m Grumman Hill w la b R i a l e r D l s o P H

D C B b l i P t W

H r e L o h h b R H d o c e v e v nt R Stony Brook n o l i e S P

K g ta i c e l t n e t Hw u o d e v y 15 n r i n p in i d P L l W i s Exit 42 w k e n d M g idge Dr n Ln t l o d Woodr r o D hite n G p l o B D s W n R a t i d b D w tt o L K R B

d e B e d o a ns L a o r R e o n r t e s t

Final Aquifer Protection Area (Level A) i A r w e t v e G n a l e d

R e n b r k o y y r L e Keenes Pond d t r t i Prospect Hill k g L w M o n e D u L r d t C e r k o o e r d d Sier Hill Pond Lee Pond R n n L L Old Pond p o D u l N w n o p h I F e l e t A m w t G o W u t m k S C V n o m C d o Field Club Pond o w a w a s n a b o i sa u P l r o Kelsey Pond d u O w n a u d r S o i b r l w e m n w a P l L c D g o m l H Ln i l a t n L S s R id ls F l t o h e l C p W l L e e l a e n d Taeger Pond L o d F o n e S i r t t l Belden Pond Rd a e in s F o e n e D t u o t n w s k o K F l r A Major Basin Boundary Rippowam River n d c D T s R h th n o C a o ea n L n i a i a D r L s n t Silvermine River H r i a L n a v L w a l l e n k t W D L d g n d C e r n R t l i S H r n S e e A L e ockanum e o r e o F ld L m o Rd L n m o e h Brushy Ridge e m S oxb n lu r e e o e r w e y W d ro D v d a n n s F T H il r s C y r v t S R n a Blanchard Pond i i e L w r l A D D D l R e r o A en B H t e r o e R r d l o n m C t R L L d d H e v r w o H e t r N E W C AR N A A N e d i is k n e d n R Shallow Pond R e t Q d L e e h y w e i p y i e n L u l T t s P F A S r r L r S l k n R m n n e c u n te u r v T L s r t a d s r L i a e T e R a u y h n a R l e ic B a l n u C R v y Bedford Middle School s Para r e l r n i N de Hill Ln l i g t c o e e a g a l l i d l id m r O r a e r l Valley Pond S t D Oakwood Pond C w o C r a s d R a Great Brook H H o V B Cranbury Elementary y o k c n D t n D

Two Acre Pond e e i i h M r B h t w Poplar Plains Brook a ! ll s R e n T u Silvermine Hill t v A k l a e T R B r e O P a r H r B S i n e w f s Banks Pond r d d e o r d a o h u g ! R l n L s e D J n le d o Rd il sh d ay r il Willow Brook R o r P m y d e enle d l R B t N d r d R re R y i t p n r G g R g e C n o a B r a n n r g A c ni R d M id n L n e n n R ly S u R s y w d d W u b R m D L ket te t d s e n i t n r a S g i s Gris o d e o o t t Mill Rd K n r e Muddy Brook t n l u E L D e v d p l M o n n R d i H R o F u l ry ly n m l r w C m R S e i t a a r o a i e n C R u L l o W d H o Q k l s R R D c i L e i ge Nothing Pond r B s l L r S r n m d u Wardwell Pond r l n d t r r R C k S L o o Greenley Pond t EX PLANATION e e e a r a r a s R w R d o d R t p R r R d h e W R v o y s n a e F

r o d B D D Staples High School d i i R i d o le h d Deadman Brook v Perry Pond P i R c i t M b B lf P v l s b a a o o w l c e H i l h C n l i d a i n i e H S m o m d n e B M Br o c a n h r r r oadvi W n e u C ew r t Rd R r s R e r n ! a r M o r C e d t e r D r H S 7 k e r D d i ia Hickory Ridge e burn r c o n g n G y c ae d e R k m r s B R r t Br a r e s v D y it o d e o i o l L J a d n k Silvermine v L W ATER Q UALITY CLAS S IFICATIONS (W Q C) MAPS are one S urface w aters w hich are not specifically classified shall be t d t i n o d R L r n R F Lower Belden Hill R 53 d n a n w c i C w e h Juniper Pond e ra S ri Hydraulic Pond ll C ill s e S d l n S a V s e i t d g J r r A t r v H h H d r h H h l G d g o t R o A e p e r A o H n L e n a G e in lk a R G d q w A n t m i R a Timber Pond u S v L k a L L ill S d P n n r

of the elements of the W ater Q uality S tandards (W Q S ) for the considered as Class A or Class AA. S urface w aters in GA ground s s l H A R in i t ind n l rd r e d p W d u r u a e o R s W H o n n d b c r b d i e o ou c L ap U o o R p m w R l d k F e R C H L r n u lo c k p n o d L g Cranberry Pond Wilton v e o il i e o T c L i L g w C er L P d n e i Winnipauk Millpond e n p o l e d t i W r e e n e n t l d o k A y D g d s i n L w h r o v R S tate of Connecticut. The W Q S are a part of Connecticut's clean w ater areas are assumed Class A or Class S A unless otherw ise C i C u o o n n e r r r y r R a n s H J d t R e o e r d e Carter Swamp r a v d C w o L R O o E w b d a R H D Guthrie Pond i n A r R L d S d e C o

f i R k Guthrie Pond Brook e f b e e im o i n y l g g t d u m d s e d n P l T d Carter Pond c v y t w r a l d h K i o D w ater program and are essential for protecting and improving w ater indicated. S urface w aters in GAA ground w ater areas are assumed w e w y h o L R R r

a e a P A R L r S R t H B o H e i e o n d m S H D n d ld o i i B i r G W n t t n d it i i Y e y i a r e n o o k v W n d V l i O Ove W l w rlook Rd V b e l i t S A i v y c d C R s a R R East School r l e l a e R quality. The W Q S follow the principles of Connecticut's Clean Class AA unless otherw ise indicated. S e Wahackme Pond x s P i c s e W R r t n a A r P d n y r D o d L h H n r a h L o c E c w a W y l l o t ast M M e a k r Av B m e V e ae P r o Y Cranbury y J r r T L f e n rl t t n Silvermine Elementary c Tanglewood Pond d c R r L r h n n t o d S t Dry Pond i g G a g ! o D W l o e C e o Dana Pond L d k R P l y e b S n A e F e B e uttern s Comstock Hill u e S t Ln s e o a n W ater Act w hich is in Chapter 446K of the Connecticut General v o R s n o k r b n u k l R e M h i R u t h s L d v n ! l c b r t r d a o t l e S Ln n n l r n Mill Pond r e i a p i d o W E S T P O R T c n o Woods End Pond l C c P R e y l J n t D d l L C E y L o H h e e h n A r i d u New Canaan Station h a t d o g l a R m R D s Winnipauk L B v d y e d S G S n e g u Indian Hill R ow t y n L d i V e S tatutes. The W Q S provide policy guidance in many areas, for On the W Q C map a surface w ater quality goal of A is represented e A d d r m l L r w h P d e ne e n a o y t A y d W L Pin o R v r e Westport Pond R d L k o e d M a n g n n k d A t H n i t y t l C n s S M m m e L b ! y Ã m r a n e L o lm w L S E s le k n a L i Bridle Path s b E o e n c A i Clapboard Hill o o n a B d u M l u n l t o v g tt g S L c i R v R A w e o n S a C i example decisions on acceptable discharges to w ater resources, by blue colored w ater bodies. S urface w ater quality goal of AA is n H s n P B u S p i t Woodside Pond d i t k W t l O e St S l a Norwalk River d n n a r g e M i S d e r d l l K r e p L n h i u L u a l i i l b M S d e n r l b a Merrit 7 Station d H o n M R o p e l l rl i in ry G W h v SA r n a B L Woods Pond Brook e Deadman Brook Pond T e d g r S o d M tt s R T rd A H D P S i u d O r U siting of landfills, remediation or prioritization of municipal represented by purple colored w ater bodies. S urface w ater quality n ea Silvermine Brook B oo r S d W u d F c r h t H r g W ks D t k W l il d in L d w G e g c c l n l ! W ro o d in Ã ro i W R L G d a h k R r d Marvin Ridge d S Mid r n H R ill Gorham Island e R F t n A R r y l e r L k o H l r o L l l e t e r R Exit 3 a o i d ge u b il o e a M m r d l o s o l i D i Potts Pond F d e n i l d H o Long Lots School n w r e P L o d E l t d b r y sew erage system projects. The first tw o elements of the W Q S are goal of B is represented by gold colored w ater bodies. H w D F t do D A a R o h n l r y l e l L s o S d s f y ea n d n R f o a z ly n r y i p b n R A ym l n m a i ud Exit 40B n o i r y i R i n s e L d n t i l t y m r Sk w o h d M l S cho k W R ! n t e A s r i v le m o P E n e t d d M t R t s t L L s l n h g R L Sherw o t d e v n i ood St R e C n d B n A A i D c d t R C the S tandards, w hich set an overall policy for management of w ater L n i o e e h L y o n a e e h Cascade Pond ld L R e d P St B S v d c t I e L t d r r d A a i c Exit 40A v v f e L S p in t n t r e u s W g e R c e R R y n e r r W a S v s o h M n L l v A S ri e H l u L rs e d k v A g o C r l y e r k O d y B o W i C e a e t quality, and the Criteria, w hich are descriptive and numerical GR OUND W ATER S in Connecticut are classified as GAA, GA, lm a A r d e e T n e n r i P R s t Country Pond e a n s Exit 39B o a Bulkley Pond a C s o l n Rd o y a k H e c R A a ri O s d Inwood n il w p R n i o L d l T L d o h W l u r N L m y Fourteen Acre Pond i le n W Je r n r Ln v o m r c e A g d Hyatt L ri s o e ller u c West School S n A n i n g u Ke O a K e L re b l o b h p C D Muddy Brook Pond e k S k t v No L l a L t r a t Frogtown Pond H s t b R P standards that describe the allow able parameters and goals for GB and GC. Class GAA designated uses are existing or potential r R f n i w e tingh e o S d o r l am o l t t d n R d n e Pl h L y r k r t S T p t t s r C ld D r R N r na

C n r p i n e o e r AA i a G g o 7 r n e C T i s e le D t ! o A d x d r M D t R e e a y h c y o s d l f t £ s r l A n ¤ E L o n D e P e e le w S Exit 39A B P C w S u d G t R n F l a k L L n r u Nash Pond r p c o d various w ater quality classifications. A discussion of these tw o public supply of w ater suitable for drink ing w ithout treatment and H R r P e H a a os St d R d o e a ch e t l t o Russells Pond Brook d i q n s Bir i S e a S O g g L H Rd l l e n n S c a r e a K k y H e e t d n O a i a d v a d L l a t a t n w n r n d n o la y d R d P i M r t g s R n w r w d R e R Silvermine River To rk e C R h n c o C i Briggs High School d R i e D R n s n i d o y d l a v w S t c e ou B s W L l r L n d t C s L y I e t d r B a e e o R elements is found in the W ater Q uality S tandards document baseflow for hydraulically-connected surface w ater bodies. The R d ston P e n h r n A m i d n ost Rd r n L n h h a s D e Rd E c r n u s idg l a r t v s pre d rshall R d n 1 m lm v G ! P T R n d a b Cy R L M r i Fu i S h T h St s C L d P l n Betts Pond R i Woods Pond A g 2 l e o t o o L ills t R o r S n R l M m d n M e W i f e P e t d a n l C Greens Farms School P org available on the CT DEEP w ebsite. The third element is the Class GAAs is a subclass of GAA for ground w ater that is tributary d W li s 4 r o d e a Ge k S B y s y d d L s o M l S t s S e R e o m o a A o L y r P i t e o R n Wolfpit School d e r n lv a f o a a R Stony Brook n o l t L B a L r b k a rk r B l i v s P ! l n d y C l n o k d e a A L k V d w r s l R P l S r e e Exit 3 n s a R n a h Classifications and the W ater Q uality Classification Maps w hich to a public w ater supply reservoir. The area of contribution to a D R v O i e d r d d s l M r i l B h urr ! w r d ay n u d y i B l St West Parish Tributary Dam R a d i l l N D e r t t e ! R l l m n m i d o r o g h l i n North Stamford Reservoir A i a r t D w e i sh r orview Rd l o B Tr a w e Harb o c s u ee O a a n o R Ln a d c i F d g R lk L a Q w F Clara Dr n h J D y d R R d show the Classification assigned to each surface and groundw ater public w ater supply w ell is represented by a 500-foot radius around e i d d Kings Highway School O e p R R v n s d a Ln West Rocks Middle r e ill e a n l s H r e S R l Brookdale Pond g ow g Exit 38 S r d R Ln il D d e d d r S Potts Pond Brook u ea S Hams Pond u r a o ry R M h B e e t l d H o r 3 ate n rc ck El ir d D e r H Davis Pond n r u S O d h ll C resource throughout the S tate. The W Q S are adopted using a public the w ell and is assumed to be Class GAA unless otherw ise kdale R Noroton River w t R wy ri ! d le D Ln Hi o B k e ro W o 1 Lower Hams Pond s R c y S t R K y B S 23 t e su M n eC G l d e d y a ar rk P e r F e i B L u i n a o t r Deering Pond n O H D F n i T it e a N P ir R v o c S h t v r S H t R w r e r a a Road Pond s e w H u F d s rd L r n h l e a i r l y lo C c i q l o Ln L r o a u a A c a i i o r e k l l i t W n C o i n l s r e Turkey Hill a D l h H c participation process. The W Q C maps are also adopted using a classified. Class GA designated uses are existing private and r g C a l o l n Benjamin Hill u SA g r a E t r s i w v i l f n u i P r y e R e o k o x i n e i B A a Ivy Brook Ir k o Bald Mountain o s L h n G v B c e a h a t e Ln e a e H a Bird Song L Saxe Middle School r i k M s l o o d C n i v l t D M T Old i s n d e Studio Rd a s l i l a u d w t i P P d e t W L d u n r a S d o ExSit 2 u G a C f L R k A l s A s t d d y F k m o D e r l a n e S T o f B i w i I y t public participation process but go through hearings separately potential public or private supplies of w ater suitable for drink ing e n d w s t l f e i R s r o e n i h Hoyts Swamp n W e l w ! e s h i i d o d r r l R V y n C t e a o o i S r e s n l w i A D P l S w A e i i n R r t v o k T S l to t B d C S e H r og b g p r r Indian Pond e a r n o F n C t e R i r l i c c r V e D l l a o J n t i e n e a e L D L i G n L from the S tandards and Criteria hearings. R evision and adoption of w ithout treatment and baseflow for hydraulically-connected D s k S Greenacre Pond L o O e N l r e a o B d e F d c M g G l w k t n u k R l c n o l l n C n s s t t e d h a r r n n v r k e i A B a l D R ll v t s o l n u e n a v e South School d M F e o e n Kellogg Pond R S Kapp Pond D i u L i Greenacre Lane Pond School Pond k t R R S r D w e ie W d R u w r l c S M n d n R

n s t w the W Q C data occurs in accordance w ith the public participation surface w ater bodies. All ground w aters not specifically classified R r n T llo v d o n A t R r H e t S L e d t epy y le r m e l a S n n l t S L o t e a d r L e i R r pp g d e v R a e A A R e D Kn New Canaan High School ! a h S n v i e 137 R t l H le v r r A D y W a d o e e d r n n l v z r d S t y r E e d r o r r e A a r d l R S a v l r

t m S C V D e S B v a r t i R u e L R L e Kellogg Pond Brook a t a u D s A e s R n r L d s e t procedures contained in S ection 22a-426 of the Connecticut are considered as Class GA. Class GB designated uses are e D S h o n P r h t r s o y u Davenport Pond l T r d n L d t A e d ! u d o t v r D n e o S e c i t o r S n n l t R N H l c f i S a 5 y u S l y l o Q a L L e l A t O u t A i S d S e a R t t a k w R 1 h s D p H d n y a g d o e i o i y C c R r v V L Ponus e i y d v s y C e r L General S tatutes. Ground W Q C is subject to Connecticut industrial process w ater and cooling w aters and baseflow for o e a t p r g d r s r H r O S u d a u l r v i e l e R n a r f R N w a P R m g d n S l a d a t k r n e o e i r k e i a o n a e e i R e y r J b np H u s s n y a en n v n k G p R e L s Betts Pond Brook A p l e o n d E l d v r t s d a n t z N a y r L c l k D e p e le o r i e t L W t t u y d n u L D L H G p d C F P o n o st l rl a k m T Si regulation and changes must be review ed and adopted. All changes hydraulically-connected w ater bodies and is presumed not suitable n g a u v e l e v out nal Ln R n n t S i k a w I o t W o L r w g L r St h W Bendels Pond e l o R A Cannon R h r i e S n ve v d n e nus A M t S Po N t Exit 2 t d i R e o hag S l Newtown Pond e R e bar e x h i Adams e k l a Av H K x D L g e i H e R n r b L u v d Ln A F e w L a l i w

r n g

Z y I s d e o va e a G n R Signal Lake d n n d e s a R m e R C e s to the S urface W Q C require an adoption process w hich is subject for human consumption w ithout treatment. Class GC designated r D w p v d r a t T a s d r S D r e d r s a R Clapboard Hill a R

A r r t r o r S v R g d t e n n d u SA a l h A i n r a r d i H

F d Tracey School n 3 1 r e l k y e y n n d n d t n o e T l S e D v t S w i ve c 5 i a A A M a ll R L n J e l t t H we Crystal Lake Brook r A d

S D e n a to federal review and approval in addition to CT regulation. The uses are assimilation of discharges authorized by the S e s e r a i n K R T R e n R U e v r y H L ! S l m k s

u d v d r B r a r e W R d S S a Northeast School d a y t Ponus Ridge Middle Cou k y n e i l s d w ty St Greens Farms

R e e F r H n e B s d v e T cr erde t r Saugatuck r l i a o il G t y n m l H o H n a H a adoption dates for the W Q C by major drainage basin are: Commissioner pursuant to S ection 22a-430 of the General S tatutes. g t e n i g i n L a e o D l e S c n ith p v c d O d d e K u R n ! re e Darien Pond r ! A Sunrise Rd B rms L e n e a e w k T F H M o e t s r ns D t e y F d ll e n S S id Gre H L u S r C f S J r Norwalk High School g o D r A o R e y a e i L o p F t t a N r R L a Holy Ghost Fathers Pond e r l Green's Farm Station t t O S Housatonic R iver, Hudson R iver and S outhw est Coastal Basins - p s t r o v a t t r f t n l r r a r c a r R t l i t s R R n p c n e d h y r d e S S D M Talmadge Hill e i o A n r n L d n p r i D g r G l v ! i e s R h a t e Alrow o le n r ood a A i o a e e L y Dr T rl k n H ! d R L n r S o v o d a t Ã H W l T S H e d a g L h e a l o Grove Point G n March 1999; Connecticut R iver and S outh Central Coastal Basins - On the W Q C map GA is represented by w hite colored land areas. e t l i P g d i Exit 18 G n k S l t a A Escape Pond m d i l c n x R m d a c Holy Ghost Fathers Brook S l g n o o h l i i e b a D l o d e r e W l S e D t g y g R e a R id o R H k Blue R a A H s e e t v Service Road k d v v l K n e A S in L

Grass Pond l l B n o w s h il t r a e L o R c S c h m o l i L d i O k i n r l R d v r e D E n in R e l a n l B iff Mi rv R M o A Pa Naramake Elementary Je m n ll t t s e e r a u u February 1993; Thames R iver, Paw catuck R iver and S outheast Class GAA and class GAAs are represented by blue colored land J a r g G P n e Millard Pond o A r er d B r e c S na t r Ext it 17 D l Ln S d t d e t C g a t e S r L Jellif Mill Pond R r t n e F S d s A a C land L b t s t n I v c R d v e i ood n r R i d l ! an Sherw C l r a v n g A k Ln B a L V Marva l awExaitth 1a7 SA d L h a l Hi w c o r Exit 1 l A e u d Mill Creek e Coastal Basins - December 1986. S urface W ater Classifications do areas. The area of contribution to a public w ater supply w ell is M SA Exit 37 i E ir e ttswood Rd r Westport Station w n w Be d GS n a Ponus Pond B v o r a R Hale Court e i e C Kendall Elementary u a n s t i e o y Ct 15 i S l B S h rr h C D s N d Pa H SV h t k u n ! L mplight Ln c a W L Ã La not change after the adoption date until the next major revision. show n by a blue cross-hatch overprint. A notation of GAA w i Wa y k k o l e r r a l r W L s Talmadge Hill Exit 37 p n S St Av er y H n i c e d i ! B a F r ll p m g c n O R or e B p d d t M a F o e r p e R i e e y R N O R W A L K e r E rr Talmadge Hill Station n m l t Indian River r rr Mayflo R T Pa l P y wer Pkwy a e L R Greens Farms Brook d Exit 36 g Jefferson Science Magnet School l i d n Ground W ater Classifications may change after the adoption date follow ed by a state abbreviation indicates a w atershed that M n

d d R S u rter Oak Dr e lo e r a V o d Ch B L e C ell Nathan Hale Middle b Sherwood Millpond e e s d Fox Run Elementary t S r a r y w ! i a Ã n n B u E a n n c g ! o l s Wire Pond l n n e n n n r r

under specific circumstances. The map may have more than one contributes to the public w ater supply for a state other than i Raymonds Pond n a L t y SA d n d k r A ! L L L F o B d ! o S urn w ha B t m g k R t H o c S g a H o d o S R l n d o r W r ss West Pond R m R v L y m n l i o Norwalk River tt u l e l D o o e t S a e W Rippowam River a r i r P e n i l d N A l M i r l y

i C r l o r a n w a e l r ie i k

H B P W Q C adoption date because a tow n may be in more than one Connecticut. Class GA or Class GAA areas that currently may not M W s r T R e o Ta e i lmad h l ge H R r d p ill R l d n e B A W R w L l lewiv a V m e es t R A o D Rd l C a d e i y Exit 1 C d D S Spring Hill n i i u Burial Hill Beach d l r K s o r d E R y l lm e t it C e r h v Rd Frost Point l S a n l er t t ve Mil R A a l n a d d il l i A v H Compo Hill O m m R d set 95 d o E u n r e Bethmarlea Pond r e u T M major drainage basin. be meeting the GA or GAA standards are represented on the W Q C dg R n S ll R e Springdale Brook d d e i m i L a H W d n A s v S e r e d Florshiem Pond m e R d R Burritt Cove Norwalk i d § ke p t D ¨¦ e t R n r e r R T a g s A y rc o Y o n t h m s d w D e St r d r o a o n t t A le St e n d M i r S Map F e R L h maps by tan colored land areas. Class GB is represented by green C B S b y C o r Stephen Mather Rd t v n i i O y E d t R d l E n d e t r a l R L i R r n c ak In k e D A O dian u i e e n C e Spr o a a l r it l in c a h g Trl t L d s o L W d Land Pond H n sh v h o e Mathers Pond S e r h Fivemile River e ro g s s n H t n n Exit 35 Norwalk Hospital e o Alvord Beach g e S R g S UR FACE W ATER S in Connecticut are divided into freshw ater colored land areas. Class GC is represented by magenta colored e L S t l t W e e h d i t F n n C lice Dr S v o t i o Ln S B n e c t tt Compo merald a s e a Av C a H y a H E s e A rsle e S G u Compo Cove v e um Eve B n r t H Exit 35 e P r r ! t le C l e d T e h o Sherry Ln r e S classified as AA, A, B or B* and saline w aters classified as S A or land areas. T l R s H e w W ld i i But r le r R p G r N rl l g s t Stevens St e St l v a B O T g S r le in Bronner Pond P le e C R s S No R e id s o A l o t r d r r i A l ip y a n e v L B e l R e 7 rl el e e il W n e L m B D i t r i n L i R r g n S e h d n d i p t d o l l d m v v e S P l d u v 3 La Swe s Rd n v d w o S B. Class AA designated uses are existing or proposed drink ing d r d ke et B L T k l o C t r D l e h r o P e e P a R e i n d S L a o C

r r A w e B 1 n R t h A r w A b s q t d d o y t u T Sherwood Point r Cemetery Pond r n a S n a o R a Stony Brook R on N S l y t e a Sherwood Island Beach B o t Exit 16 l Dr rb R c w s r t t e y n Scribner Pond s e n L i e d B o e r F r P w H I d y o e t r n rr d F o S w ater supplies; habitat for fish and other aquatic life and w ildlife; FINAL AQ UIFER PR OTECTION AR EAS (Level A) are included n n A te r e l w e o e H t o e i r e g L va r D b r T l le F e le d L r n u v w r k c T e y R w a e T r d p

o c a i H H d r i T u n a y i l r r v T r Newfield t L H o L y A r r Hendricks Point e D r D r l r

D h i ld g i Scienc r r V Grays Creek ie e R u i t R f m d e ew a n s e a A e N n i l L T a D S r k v Exit 16 B e d c Richards Pond o d recreation; and w ater supply for industry and agriculture. Class A on the W Q C maps for informational purposes. These areas are t e e

f t r n s l i o r I C u d t o w n m a e n Saugatuck River a D v G e W r m a W n o y b e o y r o p r i d a T L q t g Dr R y v u Turn of River R utter C y W s b A l R n P o ro g e o l w e p ked ly v t Av o B d r l m u M l e n a n i i l w S S S n R le Rd Salisbury Pond s P v A S St Aga n e e G e

H e a r y d g designated uses are habitat for fish and other aquatic life and anticipated to be reclassified GAA during the next major basin Half Mile Pond e t tl ield A u c u r r f R n Mile Rd R L d V e c t y East Norwalk in Gre o G Half l Oyster Shell Point W at n i C t M

u n r M a K e e e s t esce rsh k e nt Rd S S S Kitts Island r k l t ik l o n t L c C T R r f e S

o Priscilla Rd d Davenport Ridge School d

a n l b i a R t t L y N O i n t em e ur K S o v b

o Woodway Golf Club Pond s w ildlife; potential drink ing w ater supplies; recreation; navigation; updates, subject to public participation. The Aquifer Protection n Hollow Pond i r C Owenoke l o n i P l a r Arnold Dr n S e a d l Exit 15 r a d d

! C o n P e e r w l l i n B B l C East Norwalk Westbound Station Sasqua Hill L e R

v a d o r

e d d D r o Re P i e O M l d S n o e Exit 14 t and w ater supply for industry and agriculture. Class S A designated Program helps protect Connecticut’s public drink ing w ater l c SB

u v A R o k C d d e r o i l R e s M r O W Ox Ridge Elementary o d ! SB Compo Beach

n A East Norwalk Eastbound Station D t

e o R Ã p e t d M R o C od e d b S n w k A n e o n L l

a d v o r r o y y d a S b o d C s t s e n R n a r P uses are habitat for marine fish, other aquatic life and w ildlife; resources by delineating aquifer protection areas (also called m T v l

a u a d o R e r r o S R ! Cedar Pond A St n H r ! r l i ner r a SB g t Ga S m

Ã n d e Exit 14 o i d t n E k L

K t w t a d a C S D m o S d n o s i n s e t s r r o e e c r

o i S t n O n B c t t q e b u e I 4 e M o r b f th S w n u e R t R r x u D r B i A ! v o r d o i shellfish harvesting for direct human consumption; recreation; w ellhead protection areas) for public supply w ells and establishing i L m k S A a r e u

g m O n R Rd D e R n A ld D r o r w v m P t i S l n R r d a a l v e l i l w S e u R un o r d d g s B d S e D r t P C o v a P n St o r e edar St m tu

o e g Golden Hill e c e d E k m L n n e t R Norwalk Community College b m e P R R l e D K t Mill Pond Ayers Brook L

u d d y le l A n r

Cedar Point industrial w ater supply; and navigation. Class B designated uses land use regulations w ithin these areas. These areas represent the a S a e l n L v l v u t R e E A l S l e l d

a l l G o n S v r c y v L d d t a o t P 1 e S h n r R n h a p P e o S a s e y R to C n or C s d e A r rb M o r r N t r o

u u C d e £ f y c F S r l ¤ t n l D d d D i h a P Bluff Point Turn Of River School rie s a o d u e r l S M M e t s B l d are habitat for fish and aquatic life and w ildlife; recreation; land area contributing ground w ater to active public w ater supply M u n t M t m a o pl r w u R s S S i e r a d w b e N n o o n e

o P e h i r S e d R e ea r i Pl n b Rd C C c view o o i A e A w d k L ve e f

o v l e wo u R ! F All t n v sz C o l c a h e u Club Pond W h o m v Ju v t P as a h A in l C P g d to H d W n navigation; and industrial and agricultural w ater supply. Class B*, w ells or w ell fields that serve more than 1000 people and are set in a h S e St SB e a d u A P g o d S c r l l R l o R R i d g c B h k u e s t d k i k c t t l i t a a d i l S L L i l S o c r o t r l h c i a d i a e s l t f R c s n H N u i Rd n 1 y Acres F Ma n r ge R a dis i L Rid o H K n S R i t C n o A C o m a l l applicable to Candlew ood Lak e, is a subset of Class B and is sand and gravel aquifers (stratified drift deposits). R e d Springdale School m r m w d d o m v

t a a F t o w S r e p e J l Eliz d e n n ab n w a eth s S v S T A M F O R D W t 2 e Cro B ake a ss Way n m or e R e S D t a n c S ! Mansfield Pond w A r E r r M t B identical in all w ays to the designated uses, criteria and standards V t e S y e t r t l S T C D in ar P berry n S n rd k R N l gm Mu L a C 3 a R s L e r e u e D a ly r t r l c m A d d R o y e n o a w d M A Cummings Pond W South Norwalk Station B e d w r t D o g t C r G v S o w Saugatuck Shores i v for Class B w aters except for the restriction on direct discharges. o S c p k

i d t h e R b v t L l n r S e i n l g 4 o o d d e v e n l i e o o R W r D l D le a r i d n e w i ad Keelers Brook S R S M t s o o

o ! E e Ã A o m W d t a m d H S

d A a e d R R H r h SA d C v Class S B designated uses are habitat for marine fish and aquatic d t am O g o Knapp St p Ave t 5 s V r A e e Seymour Point e

a R w d d Ln b South Norwalk Canfield Island o o l n nwo utto a i B i v r t e N l E e o N d o i cho t l yseli k ls w us e A i P v l S Marvin Elementary e No w L life and w ildlife; commercial shellfish harvesting; recreation; rth n h r e M o ill e d S L R t n l a rri H v Conc t Be l d i D ord St R L H a l L D n d J d G l A a a O h I ! n r w m r S R a c R n C ice y to a i A y a Fitch Point easi r e l d n industrial w ater supply; and navigation. R F l l C B e n t v y a a d P P d r Weeburn Country Club Dam o d lif M t l e m A f S E erritt Pl S u n v D n e Newfield School s v t S e n r a e t d R S O B d Fahey A L Bu e r f h d t s t i i e v Ya n a r t e le R S t e e Ct a l Ln a t r n e l t Marvin Beach l S g i L Q l A t H Birch Pond L A SB i ox S a d o ! t W k h F v S n t h d z n L l an i v L le t e u c i o e k r a N e l n F t O M e A S A T i T v r r R o D o Nicholas Pond S r i a a Ha w e a B r S o c n h w e e v R n rv r Brookside Elementary r n e n o o a n u A r s M e t o D el t H g v d d i e n t e e R l D D il i R L r G d a l n n G a l d r L e P r n u H o o n a s c t d d n n w r n d r d s L o a Springdale Station w H Overbrook Pond h ! u d a R o n e R A A H a d s n l o r l o a Middlesex Pond t i e i l A v a g t R C u r v n s a l l L L H B Sprite Island Cre e k l d st L r v L iew yn o b e d Ave ! n o o B v W C C r x t s b d S Ã d i er o a F a B r W v l I u e e d O P A e n n Brookside Pond t F G w n r L L L e t R a r v y r R ind d n t r v e L EWxit 13 n r i n o o r o Springdale v n o o e Dr e n A e ood t e Crestw f n r lw Sunset t o l e R DATA S OUR CES d n n b B t e o s a S t R n R Rowayton Green Houses Pond Charles Creek

n L n c g K S n d o k t S n SB t e B D B e a S e a A d e a s v r B t o r Ln o r d i O n t S irch n t te B r u hi m i W l P S Cady St L n g L i g l n L S t G Royle Elementary g x n D r e M R Shady Beach a n n re a h n B P n t i e i f w k le n n i n t L a p d e r i o Gregory Point r Brae Rd l v M o Bria p L a e d St Charles Ave n A l s L x W ATER Q UALITY CLAS S IFICATIONS DATA – W ater quality the individual w ater companies ow ning the w ell fields and g ! R L a p r d r e A Dr r r m d a xter a e n e Ba Academy of Information Technology and Engineering r n s r r h a d S e ber D n e m o e a Brien Mcmahon High School y C L H e a o m F l S w n Elizabeth Ave Leroy Pond W v M t n f v n t s f a r E t classifications show n on this map are based on information from submitted to the CT DEEP for approval. Preliminary mapping d O a A ! Coopers Pond P e n Darien High School t n A y A t A d r F ! Ave ! A E Neptune a d D r R L e Miller Rd n v R d Chatfield St a e v e Nutmeg Ln B L R a Ln l d d n n p n a Cummings Brook H r o e e l ho e g l n i R d f ! Sc r Calf Pasture Beach r a Rippowam Middle School p i h the follow ing digital spatial datasets that are typically show n provides a general estimate of the area contributing ground w ater R o h f ig M H G i n m s e ils g i e Noroton River H P e d o e C ev Neptune A Cockenoe Island R l D h ve r K d J e U r i t e Burw n e a r ell St ity e G c n n i ree n l S R n l r r e a r R a a f h d t A a

v S u Ogd e r i together – Ground W ater Q uality Classifications Poly, S urface to the w ell field. Final mapping is based on extensive, site-specific, T en Rd r L Peach Island D L o h C c k E s e t n o d n i S S H i i y C r able a g S

e t Calf Pasture Island h d r l h C D L H l o Tilley Pond Brook R d h e a ll n a y R r L a t t R m D v h n w g r i r e a n a e a u r A u Yo e C s A t W ater Q uality Classifications Line, and S urface W ater Q uality detailed modeling of the ground w ater flow system. CT DEEP may J H o S e d d t n d n g y L s H H B v e c Calf Pasture Point Lake Pond d c s n i

n d R d N m d R Harborview s e s d l D w Toquam School i n R g A e e l R v e c L i i H o d ickory Ln l o d R s k E D e c Haske t n r o t ll r

i L L n Classifications Poly. The map legend above reflects the content of adjust Final area boundaries to be consistent w ith 1:24,000 scale y L l a i r r c u f s P d r n e

r r n k R i k e o o K a o p ! b 1 d c

w S R s

e t D n b D A R I E N P d t 0 o d D B M

e Holmes Elementary t o

t l S S Dolan Middle School L y these three data sources. These W Q C data w ere initially compiled topography and base map data w here appropriate during the e D

4 e S A n h

c u r N R l O Chasmers Pond t v t v c r v L

e u n r Norwalk Harbor Cockenoe Harbor n d A D v B e R Tilleys Pond n i ! e ood c A y

A e A w n r ep d e n ! D Hickory Bluff Beach k v w e h a a n

u l a r on 1:24,000-scale 7.5 minute US GS topographic quadrangle maps approval process. y k d e d r

i a a l

a r l O e a a n l t L r P R

V d R s G o o x V L e Darien Station Round Beach L d s es Rowayton Station dl l d e e Mid e f i Roton Middle School M s Rd A h Litt uk f le s w S brook Rd ro d h C v and later digitized at 1:24,000 scale. For example, the S urface i D L a O l b B n s a n il A e i H i y A ! ! n n n Ã b v C e t Ã r ! l Rd von S r L e L d n d o D r n L R Belltown e e 136 Streets Pond e a t Village Creek i t D n S T ked Trl o s R D l V Croo s W ater Q uality Classifications Line and S urface W ater Q uality MAJ OR DR AINAGE BAS IN DATA – Major drainage basins y Noroton Heights e o N e d m C d L a P n p W B k Thomes St a Manresa Island l d e R T y e R n e n g o R e yl I a r n d e e a e S s n d r l r k 104 r a d s D t e Route Pond l r h o R t r H Tokeneke Brook a D r Classifications Poly digital data assigns surface w ater quality show n on this map are from Major Basin Line data developed by C C S i H h d n R B V m C A t O u S Exit 12 R t y C L n i r u F d d e a stn o o C e v e l d n r e r c S l o h A k l b i o o A u C r t a Jacob Pond g B s i f e s d e r n s m p w R d t f t o l a l D s e e il t i m N v H o ie P l D T l r n classifications to w ater bodies such as rivers, streams, reservoirs, CT DEEP and intended to be used at 1:24,000 scale. a r t R F U e H i A d d l i P f a n le e l Newmann Pond m a Middlesex Middle L u t n a R R i n e a U n S S n n v i e d L n on S l t e d t g r S l n l R d e Witch Ln f e l b t o k lm a l e O b b E d o i n n Tokeneke Elementary t t D lak es, ponds and coves found in 1:24,000-scale hydrography data s P v A l ! f Betts Island r tone Ter H L y o elds e Fi i n o G n A Ex5it 11 S l B d a l A A v 9 w e c n Hoyt Island br l n I n a o t e H A e v E o e l C ! a L G s d t k d Long Beach H R k s t e i n S e l D v r t J I o A l Rd g East Trl a l e n available from CT DEEP. The hydrography may not include all the BAS E MAP DATA - Based on data originally from 1:24,000-scale o r R e S t l ge l i R v d e enry S ed n d e e Tr n a H L i I e d D s d r le r d a A p e K r O H e p n v Glenbrook Station a P T e s h R M l a v e w ld i o n r a d n a i h w r l P y A t y o D a L k O T d r l Goose Island w aterbodies in Connecticut. The Ground W ater Q uality US GS 7.5 minute topographic quadrangle maps published betw een R r Exoit 11 n l l r n e l o a W s G r r n i l l d s est Av Exit 10 r o l e r e d T e ! l F o A o lonial Rd Ã B n d Co i T H S h D h S r s a Keyser Point o O a f v n t d t l t a t i V R e w a u R L r p t w C a o D Classifications Poly data assigns ground w ater quality 1969 and 1992. It includes political boundaries, railroads, airports, e e r S S u c l t W d S r c d o m mouth R f C a

o Ply o C i s l a e i d h SA l R r r d Noroton Heights Station ve i n A y A u r ke a B t e v Hec r e o a v g Grassy Island S A e R

d r n t M a cen Puritan Ln r n o g classifications, at 1:24,000 scale, to the remaining land areas in hydrography, geographic names and geographic places. S treets and rb n L i V t ve U Lenox A C d

l L C R b t ! n w

S a Ã rry St Old Farm Pond Cedar Hammock ® t a o e t a Ch e h e d S n g 8t er re r st u v

S Julia A Stark School A v e d h d t e n k Connecticut. street names are from Tele Atlas copyrighted data. Base map R C v i e s t e r A o Sacred Heart Academy e B i l S A v t n Goodwives River t d R

e R R v v e e t A h r t S l d

S i l l N r n n Exit 10 C d 7 h i l s t A a L n r h 5 n u M T d i ! A Maple St d t v i n d b P l P Noroton a 6 e R n

t e e R r ! o f e

information is neither current nor complete. A S s L

o t f t g d a g d n Rowayton School

i W t v h d f v n n o t T h e i r i f t d r m i g A r y H r i n S e a F n F p

l R W h o a t r R i l C il i

4 S a H d o

F d a t c e R n e o a a n v t k k t o r S t t R l n e d d Chimon Island e c o

s r ! g o l t d S y k e AQ UIFER PR OTECTION AR EA DATA – Aquifer Protection i o P i Br St Noroton River i A Stony Brook p w l u l e d

th d R m n s r C e i l P l M e h i H r I

S o T l e i r u L d y o t S S i l Glenbrook P m n F H t r a a o n S o M R R lc an Rd k a Relih r M om a D d D SA d t a e r b A M P i H l Areas show n on this map are from the Aquifer Protection Area R ELATED INFOR MATION r v y 3 e n e SA e t r g d R l r k e o 5 e W t t R D s c o n o i r v D S a o St D Tree Hammock t Ave V t san N d d ton n a u il e d H Ham ta Pl R e H T Farm Creek Pond n n S i A r 2 F b o c digital dataset w hich contains polygon data intended to be used at This map is intended to be printed at its original dimensions in L d v a R w y Fivemile River t i n n i r S r k n B o a L e t S J y o s t y o i c R Wilson Cove n L o s i Sandy Hammock t w n h u o 1 t s T t h t e d t h n C l Stamford High School 1 o s d s s Little Tavern Island A o e 1:24,000 scale. The dataset contains regulated areas classified as order to maintain the 1:24,000 scale (1 inch = 2000 feet). n e w r t r Wilson Point R d S o S n A e 0 i JM Wright Technical High School y Rowayton v k s o a l e R a A l n v t i d r n 6 v i Norwalk Islands O t n H A R e A SA L t n ! d r

v n e k i n d t e L R c S n v w S W L y A SB ! H S Level A Aquifer Protection Area (Final) and Level B Aquifer W ATER Q UALITY S TANDAR DS - Go to the CT DEEP w ebsite e a a w r Rowayton Beach d n w S e o R e d d s y r B n p R a o L a y e Exit 9 r o u l r t a y P S l l e D P l s d e o S t Farm Creek x d n m F e l C ls u u Protection Area (Preliminary). The Level B areas are not show n on for a summary and the full text of the “W ater Q uality S tandards” h t w R n Cloonan School o s R o Crow Island r D e i a G R H r l d i a n C P t u e v Gorhams Pond n H d i n d B ne Tavern Island e d h n S R P u t v 5 r h A o o g S y n C t h H o in t t l o rt W l c t Shea Island ! i F R e n b k o ll 9 t a SB R N c c n the W Q C maps. The data w as collected from 1991 to the present and for other information on w ater quality. t d r m d u e r L L a o l I a L e C b s p Hindley Elementary a i t A n e H a G R i o n d p o n i

t e n S n v L a o L y s e t g s t m ft d d t D o e R wi d d th i G S m i C

r o S r S S C h n R r r Hart Magnet School B r n a u a r

r and is actively updated as Final area mapping replaces earlier AQ UIFER PR OTECTION AR EAS - Go to the CT DEEP w ebsite d S r ! o r B a R o Bell Island R e t b t i e t P r e

t c t s o n l a Copps Island e b l H h e N a v T e d A g e t u b m

t S k o S a M Y n v Dog Island t S o o r s e n d d n ! r a t R v e l O

o d o S l S l n y a E a l v u e n W u t l r c

Preliminary areas. The Aquifer Protection Areas are delineated by for more information. r e e t P l G o H n r a s u s A A A a A t d r t B T h d y a I A

a e r G i t e Exit 9 e v t t t b s R s a v S l d l o n v e f n a D r e o d n f n i y e

t l k W r n e r a d Butlers Island Bell Island Beach r a e a c o d i e P r Sheffield Island Harbor u l w e e P l S b o h l L P A k m L a

D C a

e v Stamford Hospital r la ng t Wood Island St Q u u r Broad l

G s k B m r y e v n Roton Point B u a D U A

e d

c e y Scott Cove e

b l Exit 8 t Noroton Point H v m r Pine Point

y b

! o i Mathews S R SA n u t

r R u b t o Ram Bay S W

t R L'Hammock Island y S Pa st S ur d e e Ln n C l i

t e S l P n a L e

r r k P uth o L l er Rogers Magnet School W s b n S I t S M P y G Noroton Neck Contentment Island

s t e

e e S n t e e a

d SA n ! e a l Holly Pond e t v e n i d D r i r l Rippowam River v s r A l l t A F w W o S R G B i T a r Exit 7 C e a d Great Island l St r p e r odrow r t Wo d t s r r e a e t r e s m a The Plains F t n e l u y r SB d ADOPTED DATES r Tr ll Rd A es r Kno S e

ser Blvd T E e S S Sylvan Brush Island S c A M d t V R t v n P e t e v S s e r t E e a e i L

e t l c d a t t l n ve A n S m k Palmer G r

S a i S e B

S t t S S r e Fe n t B u o

de e r r o t al D s SA St ffers t Aquila Rd h t e S Je R Givens Ave Is h L H u n la a P

i n e d g a s a R d i a W ater Q uality S tandards d w k M n SB Zieglers Cove k t n Cove Rd r r c H w S i R b s W a C r r Fish Islands Richmond Hill Ave k ane e k o o i c y R t e d MAP LOCAT ION c o l S K T Murphy School l N i r e n w A a February 25, 2011 l D h d SB r N a s W

Stamford Station V e v g w S o n Hay Island A Exit 8 t t S v t t C k e ! t w n ric p n e t

i v im S

L S A S a o S

H e ! a h n over St t S Ã S n k L ar y d P n c n M a r rk S et St i i a t t l t M S a e Soundview Pond or l e East Cove Island BeachWeed Beach yl c MAJOR BAS INS a n M e d T S a c v Thames R iver, Paw catuck R iver and S outheast Coastal r M u Exit 7 a t u D l g ll A a e t E e n 6 l Av A G e e Long Neck S e 3 tamf P or H L Basins: December 1986 d P en v e 1 Paw catuck 4 95 l Pulaski St W ry St A we Pear Tree Point Beach Ha n o ly y Is o A e D d v n l ¨¦§ o an Rd v t d e k Darien River 2 S outheast Coast a Av p e S A o o v i u L nd u r e d vie l o e o w L w d A t v v S r r e l W t D n 3 Thames r a S Quigley Beach Pratt Island One e S l b A t n o t D 8 p i u n

t e D 1 f w r S S S Connecticut R iver and S outh Central Coastal Basins: r w o t d t r l i 4 Connecticut a r l e e o s r i l SB t a a s 5 a t t l k r v 2 y S g i Nash Island s b F S c h s a 5 S outh Central Coast 2 Cro B n d February 1993 a I c a W t e n l r C 8 r l V ld e u e a 6 Housatonic O n D

£ o Pratt Island Two v S r W 7 t S o A 7 S outhw est Coast Homestead Ave SB Cove Harbor South End b P n r

a a Housatonic R iver, Hudson R iver and S outhw est Coastal 8 Hudson Taff Ave c a R State Plane Coordinate System of 1983, Zone 3526 p ipp if H ow p a Cummings Beach i i m Sunnyside c Rd Lambert Conformal Conic Projection Ave h Basins: March 1999 S C t S d a North American Datum of 1983 roft Rd is R West Beach ri Elmc quo ta Iro s Greenway Island l e I P r s v ell D Vincent Island Long Neck Point e A East Branch n l a t L s S d i l t l O l l West Branch che t r it S e M c i a f S e e e v l h t t A C s a t wn Westcott Cove b n o S D n u Cook Point o o l 1 0.5 0 1 Miles o D

a N d m S R r e ey e als

r R B Cemetery Point

1000 0 1000 2000 3000 4000 5000 6000 7000 Feet a d l R ore C Dolphin Cove m aga S 1 0.5 0 1 Kilometers S e ook Rd a C B d Jack Island Shippan Point e R kory Dr a e Hic O c S CALE 1:24,000 (1 inch = 2000 feet) w hen map is printed at original siz e s h u c D o Ter e h Eureka r e a t n a Rhode Island Rocks D G SB e d Av r Grass Island oun S ve iew A V Fairv a n Davenport Point R

e S TATE OF CONNECTICUT n s Map created by CT DEEP s e

DEPAR TMENT OF l S Stamford Harbor a Peck Point e t a October 2017 R r m ENER GY & ENV IR ONMENTAL PR OTECTION o A f g v o e e r 79 Elm S treet r d Map is not colorfast s A

R v Hartford, CT 06106-5127 Protect from light and moisture d e

Shippan Point

APPENDIX F

TR 55 PEAK RUNOFF CALCULATION (GRAPHICAL METHOD) ver 12-2010

CLIENT: 3 HUBBARD RD CITY WILTON DATE: 1/16/2020 DSN BY: RCEBALLOS CHK BY: DATE: COMMENTS: Existing Conditions - WS-1

Drainage Area 0.64156 Acres Runoff Curve Number 90

Time of Concentration 0.100 Hours

Frequency yr 1 2 5 10 25 50 100 Rainfall, P (24 hour) in 2.93 3.55 4.58 5.42 6.59 7.46 8.39 Initial Abstraction, Ia in 0.222 0.222 0.222 0.222 0.222 0.222 0.222 Ia/P ratio 0.076 0.063 0.048 0.041 0.034 0.030 0.026 Unit Peak Discharge, qu cfs/ac/in 1.578 1.578 1.578 1.578 1.578 1.578 1.578 Runoff in 1.92 2.50 3.47 4.28 5.42 6.27 7.19 Runoff Volume ac-ft 0.103 0.133 0.186 0.229 0.290 0.335 0.384 Peak Discharge, qp cfs 1.94 2.53 3.52 4.34 5.49 6.35 7.28

Runoff Volume cf 4471.76 5810.51 8087.26 9973.52 12627.00 14613.05 16744.38 GROUNDWATER RECHARGE CALCULATIONS

CLIENT: 3 HUBBARD RD CITY WILTON 0 DATE: 1/16/2020 DSN BY: RCEBALLOS CHK BY: 0 DATE: COMMENTS: Existing Conditions - WS-1

Impervious Drainage Area 17654 sf Hydrologic Soil Group B

HYDROLOGIC GROUP VOLUME TO RECHARGE (x TOTAL IMPERVIOUS AREA) Hydrologic Group Volume to Recharge x Total Impervious Area A 0.6 inches of runoff B 0.35 inches of runoff C 0.25 inches of runoff D 0.1 inches of runoff

Volume of Recharge 514.9083 cf STORMWATER INFILTRATION SYSTEM SIZING

CLIENT: 3 HUBBARD RD CITY WILTON 0 DATE: 1/16/2020 DSN BY: RCEBALLOS CHK BY: 0 DATE: COMMENTS: Existing Conditions - WS-1

Sizing of the proposed stormwater infiltration system will be based on the stormwater runoff volume generated by the 1‐inch rainfall event and the stormwater runoff generated by the first inch of all larger rainfall events. The sizing methodology meets the City's runoff reduction and water quality protection

Frequency yr ALL Rainfall, P in 1 Initial Abstraction, Ia in 0.222 Ia/P ratio 0.222 Unit Peak Discharge, qu cfs/ac/in 1.58 Runoff in 0.32 Runoff Volume ac-ft 0.02 Peak Discharge, qp cfs 0.32

Infiltrator VOLUME cf 746.2 TR 55 PEAK RUNOFF CALCULATION (GRAPHICAL METHOD) ver 12-2010

CLIENT: 3 HUBBARD RD CITY WILTON DATE: 1/16/2020 DSN BY: RCEBALLOS CHK BY: DATE: COMMENTS: Existing Conditions - WS-2

Drainage Area 0.227 Acres Runoff Curve Number 73

Time of Concentration 0.100 Hours

Frequency yr 1 2 5 10 25 50 100 Rainfall, P (24 hour) in 2.93 3.55 4.58 5.42 6.59 7.46 8.39 Initial Abstraction, Ia in 0.74 0.74 0.74 0.74 0.74 0.74 0.74 Ia/P ratio 0.253 0.208 0.162 0.137 0.112 0.099 0.088 Unit Peak Discharge, qu cfs/ac/in 1.489 1.514 1.542 1.556 1.571 1.578 1.578 Runoff in 0.81 1.21 1.96 2.61 3.58 4.33 5.16 Runoff Volume ac-ft 0.015 0.023 0.037 0.049 0.068 0.082 0.098 Peak Discharge, qp cfs 0.28 0.42 0.68 0.92 1.28 1.55 1.85

Runoff Volume cf 671.13 999.67 1611.77 2154.03 2953.27 3571.58 4249.25 TR 55 PEAK RUNOFF CALCULATION (GRAPHICAL METHOD) ver 12-2010

CLIENT: 3 HUBBARD RD CITY WILTON DATE: 1/16/2020 DSN BY: RCEBALLOS CHK BY: DATE: COMMENTS: Proposed Conditions - WS-1

Drainage Area 0.7523 Acres Runoff Curve Number 87

Time of Concentration 0.100 Hours

Frequency yr 1 2 5 10 25 50 100 Rainfall, P (24 hour) in 2.93 3.55 4.58 5.42 6.59 7.46 8.39 Initial Abstraction, Ia in 0.299 0.299 0.299 0.299 0.299 0.299 0.299 Ia/P ratio 0.102 0.084 0.065 0.055 0.045 0.040 0.036 Unit Peak Discharge, qu cfs/ac/in 1.577 1.578 1.578 1.578 1.578 1.578 1.578 Runoff in 1.68 2.23 3.17 3.96 5.08 5.92 6.83 Runoff Volume ac-ft 0.105 0.140 0.199 0.249 0.319 0.371 0.428 Peak Discharge, qp cfs 1.99 2.64 3.77 4.71 6.04 7.03 8.11

Runoff Volume cf 4582.36 6082.36 8665.97 10825.82 13882.39 16179.51 18650.85 GROUNDWATER RECHARGE CALCULATIONS

CLIENT: 3 HUBBARD RD CITY WILTON 0 DATE: 1/16/2020 DSN BY: RCEBALLOS CHK BY: 0 DATE: COMMENTS: Proposed Conditions - WS-1

Impervious Drainage Area 26558 sf Hydrologic Soil Group B

Volume of Recharge 774.6083 cf STORMWATER INFILTRATION SYSTEM SIZING

CLIENT: 3 HUBBARD RD CITY WILTON 0 DATE: 1/16/2020 DSN BY: RCEBALLOS CHK BY: 0 DATE: COMMENTS: Proposed Conditions - WS-1

Frequency yr ALL Rainfall, P in 1 Initial Abstraction, Ia in 0.299 Ia/P ratio 0.299 Unit Peak Discharge, qu cfs/ac/in 1.58 Runoff in 0.22 Runoff Volume ac-ft 0.01 Peak Discharge, qp cfs 0.27

Infiltrator VOLUME cf 611.3 TR 55 PEAK RUNOFF CALCULATION (GRAPHICAL METHOD) ver 12-2010

CLIENT: 3 HUBBARD RD CITY WILTON DATE: 1/16/2020 DSN BY: RCEBALLOS CHK BY: DATE: COMMENTS: Proposed Conditions - WS-2

Drainage Area 0.1147 Acres Runoff Curve Number 61

Time of Concentration 0.100 Hours

Frequency yr 1 2 5 10 25 50 100 Rainfall, P (24 hour) in 2.93 3.55 4.58 5.42 6.59 7.46 8.39 Initial Abstraction, Ia in 1.279 1.279 1.279 1.279 1.279 1.279 1.279 Ia/P ratio 0.437 0.360 0.279 0.236 0.194 0.171 0.152 Unit Peak Discharge, qu cfs/ac/in 1.126 1.356 1.474 1.499 1.523 1.536 1.547 Runoff in 0.34 0.60 1.12 1.63 2.41 3.04 3.74 Runoff Volume ac-ft 0.003 0.006 0.011 0.016 0.023 0.029 0.036 Peak Discharge, qp cfs 0.04 0.09 0.19 0.28 0.42 0.54 0.66

Runoff Volume cf 141.08 247.84 467.99 677.75 1003.39 1265.02 1559.03 1

Watershed Model Schematic Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020

1 2

Project: C:\Users\rceballos\Downloads\Mydocs\Consulting\19-36 Wilton - 3 Hubbard Rd\SWRSunday, Wilton\Hydrograph 01 / 19 / 2020 3 Hubbard Rd.gpw Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 2 Existing Conditions - 3 Hubbard Rd Hydrograph type = SCS Runoff Peak discharge = 2.986 cfs Storm frequency = 10 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 9,349 cuft Drainage area = 0.641 ac Curve number = 90 Basin Slope = 9.1 % Hydraulic length = 375 ft Tc method = LAG Time of conc. (Tc) = 3.39 min Total precip. = 5.42 in Distribution = Type III Storm duration = 24 hrs Shape factor = 484

Existing Conditions - 3 Hubbard Rd Q (cfs) Q (cfs) Hyd. No. 2 -- 10 Year 3.00 3.00

2.00 2.00

1.00 1.00

0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hrs) Hyd No. 2 Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 2 Existing Conditions - 3 Hubbard Rd Hydrograph type = SCS Runoff Peak discharge = 1.389 cfs Storm frequency = 1 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 4,191 cuft Drainage area = 0.641 ac Curve number = 90 Basin Slope = 9.1 % Hydraulic length = 375 ft Tc method = LAG Time of conc. (Tc) = 3.39 min Total precip. = 2.93 in Distribution = Type III Storm duration = 24 hrs Shape factor = 484

Existing Conditions - 3 Hubbard Rd Q (cfs) Q (cfs) Hyd. No. 2 -- 1 Year 2.00 2.00

1.00 1.00

0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 2 Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 2 Existing Conditions - 3 Hubbard Rd Hydrograph type = SCS Runoff Peak discharge = 3.729 cfs Storm frequency = 25 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 11,836 cuft Drainage area = 0.641 ac Curve number = 90 Basin Slope = 9.1 % Hydraulic length = 375 ft Tc method = LAG Time of conc. (Tc) = 3.39 min Total precip. = 6.59 in Distribution = Type III Storm duration = 24 hrs Shape factor = 484

Existing Conditions - 3 Hubbard Rd Q (cfs) Q (cfs) Hyd. No. 2 -- 25 Year 4.00 4.00

3.00 3.00

2.00 2.00

1.00 1.00

0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hrs) Hyd No. 2 Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 2 Existing Conditions - 3 Hubbard Rd Hydrograph type = SCS Runoff Peak discharge = 1.787 cfs Storm frequency = 2 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 5,446 cuft Drainage area = 0.641 ac Curve number = 90 Basin Slope = 9.1 % Hydraulic length = 375 ft Tc method = LAG Time of conc. (Tc) = 3.39 min Total precip. = 3.55 in Distribution = Type III Storm duration = 24 hrs Shape factor = 484

Existing Conditions - 3 Hubbard Rd Q (cfs) Q (cfs) Hyd. No. 2 -- 2 Year 2.00 2.00

1.00 1.00

0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hrs) Hyd No. 2 Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 2 Existing Conditions - 3 Hubbard Rd Hydrograph type = SCS Runoff Peak discharge = 2.449 cfs Storm frequency = 5 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 7,581 cuft Drainage area = 0.641 ac Curve number = 90 Basin Slope = 9.1 % Hydraulic length = 375 ft Tc method = LAG Time of conc. (Tc) = 3.39 min Total precip. = 4.58 in Distribution = Type III Storm duration = 24 hrs Shape factor = 484

Existing Conditions - 3 Hubbard Rd Q (cfs) Q (cfs) Hyd. No. 2 -- 5 Year 3.00 3.00

2.00 2.00

1.00 1.00

0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hrs) Hyd No. 2 Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 3 3 Hubbard Road Hydrograph type = Reservoir Peak discharge = 3.178 cfs Storm frequency = 10 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 4,795 cuft Inflow hyd. No. = 1 - Proposed Condition - 3 HubbardMax. ElevationRd = 211.72 ft Reservoir name = Cultec Chambers Max. Storage = 1,017 cuft

Storage Indication method used. Exfiltration extracted from Outflow.

3 Hubbard Road Q (cfs) Q (cfs) Hyd. No. 3 -- 10 Year 4.00 4.00

3.00 3.00

2.00 2.00

1.00 1.00

0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 Time (hrs) Hyd No. 3 Hyd No. 1 Total storage used = 1,017 cuft Exfil Hyd Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 3 3 Hubbard Road Hydrograph type = Reservoir Peak discharge = 1.205 cfs Storm frequency = 1 yrs Time to peak = 12.13 hrs Time interval = 2 min Hyd. volume = 845 cuft Inflow hyd. No. = 1 - Proposed Condition - 3 HubbardMax. ElevationRd = 211.49 ft Reservoir name = Cultec Chambers Max. Storage = 965 cuft

Storage Indication method used. Exfiltration extracted from Outflow.

3 Hubbard Road Q (cfs) Q (cfs) Hyd. No. 3 -- 1 Year 2.00 2.00

1.00 1.00

0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 Time (hrs) Hyd No. 3 Hyd No. 1 Total storage used = 965 cuft Exfil Hyd Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 3 3 Hubbard Road Hydrograph type = Reservoir Peak discharge = 4.062 cfs Storm frequency = 25 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 6,990 cuft Inflow hyd. No. = 1 - Proposed Condition - 3 HubbardMax. ElevationRd = 211.80 ft Reservoir name = Cultec Chambers Max. Storage = 1,036 cuft

Storage Indication method used. Exfiltration extracted from Outflow.

3 Hubbard Road Q (cfs) Q (cfs) Hyd. No. 3 -- 25 Year 5.00 5.00

4.00 4.00

3.00 3.00

2.00 2.00

1.00 1.00

0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 Time (hrs) Hyd No. 3 Hyd No. 1 Total storage used = 1,036 cuft Exfil Hyd Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 3 3 Hubbard Road Hydrograph type = Reservoir Peak discharge = 2.039 cfs Storm frequency = 2 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 1,688 cuft Inflow hyd. No. = 1 - Proposed Condition - 3 HubbardMax. ElevationRd = 211.60 ft Reservoir name = Cultec Chambers Max. Storage = 990 cuft

Storage Indication method used. Exfiltration extracted from Outflow.

3 Hubbard Road Q (cfs) Q (cfs) Hyd. No. 3 -- 2 Year 2.00 2.00

1.00 1.00

0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 Time (hrs) Hyd No. 3 Hyd No. 1 Total storage used = 990 cuft Exfil Hyd Hydrograph Report

Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Sunday, 01 / 19 / 2020 Hyd. No. 3 3 Hubbard Road Hydrograph type = Reservoir Peak discharge = 2.543 cfs Storm frequency = 5 yrs Time to peak = 12.07 hrs Time interval = 2 min Hyd. volume = 3,316 cuft Inflow hyd. No. = 1 - Proposed Condition - 3 HubbardMax. ElevationRd = 211.65 ft Reservoir name = Cultec Chambers Max. Storage = 1,002 cuft

Storage Indication method used. Exfiltration extracted from Outflow.

3 Hubbard Road Q (cfs) Q (cfs) Hyd. No. 3 -- 5 Year 3.00 3.00

2.00 2.00

1.00 1.00

0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 Time (hrs) Hyd No. 3 Hyd No. 1 Total storage used = 1,002 cuft Exfil Hyd Prepared For: Project Information: Engineer: Calculations Performed By: Andy ayala Name 3 Hubbard Rd Ricardo Ceballos Ricardo Ceballos Workforce Partners, LLC Professional Engineering Consulting services Professional Engineering Consulting services Wilton 245 Sturges Hwy 245 Sturges Hwy Norwalk CT Westport Westport CT 06851 CT 06880 CT 06880 Phone Date: January 13, 2020 203-635-0922 203-635-0922 Fax Fax Email [email protected] [email protected]

Input Given Parameters Chamber Specifications Unit of Measure English Height 30.5 inches Select Model Recharger 330XLHD Width 52.00 inches Length 8.50 feet Stone Porosity 40.0% Installed Length 7.00 feet Number of Header Systems 1 Header Bare Chamber Volume 52.21 cu. feet Stone Depth Above Chamber 6 inches Installed Chamber Volume 79.26 cu. feet Stone Depth Below Chamber 6 inches Image for visual reference only.May not reflect selected model. Workable Bed Depth 6.00 feet Bed Depth 4.63 feet Max. Bed Width 15.00 feet Bed Width 11.17 feet Storage Volume Required 1255.00 cu. feet Storage Volume Provided 1282.81 cu. feet

Materials List Recharger 330XLHD Stormwater System by CULTEC, Inc. Approx. Unit Count - not for construction 15 pieces HVLV FC-24 Feed Connector 1 pieces Actual Number of Chambers Required 14 pieces CULTEC No. 410™ Filter Fabric 198.42 sq. yards Starter Chambers 2 pieces CULTEC No. 20L Polyethylene Liner 11.17 feet Intermediate Chambers 10 pieces Stone 48.98 cu. yards End Chambers 2 pieces

Bed Detail

Number of Rows Wide 2 pieces Number of Chambers Long 7 pieces Chamber Row Width 9.17 feet Chamber Row Length 50.50 feet Bed Width 11.17 feet Bed Length 52.50 feet Bed Area Required 586.25 sq. feet

Bed detail for reference only. Not project specific. Not to scale. Use CULTEC StormGenie to output project specific detail.

CULTEC, Inc. Copyright 1996-2014 CULTEC, Inc. - All rights reserved P.O. Box 280, Brookfield, CT 06804 USA Phone: 203-775-4416 - Fax: 203-775-1462 - www.cultec.com CULTEC SDC v. 2014-092614 Project Name: Name Date: January 13, 2020

Cross Section Detail

Recharger 330XLHD

Pavement 3 inches 95% Compacted Fill 10 inches Stone Above 6 inches Chamber Height 30.5 inches Stone Below 6 inches

Effective Depth 42.5 inches Bed Depth 55.5 inches

Conceptual graphic only. Not job specific.

A Depth of Stone Base 6.0 inches Breakdown of Storage Provided by B Chamber Height 30.5 inches Recharger 330XLHD Stormwater System C Depth of Stone Above Units 6.0 inches Chambers 753.36 cu. feet D Depth of 95% Compacted Fill 10.0 inches Feed Connectors 0.46 cu. feet E Max. Depth of Cover Allowed Above Crown of Chamber 12.0 feet Stone 529.00 cu. feet F Chamber Width 52.0 inches Total Storage Provided 1282.81 cu. feet G Center to Center Spacing 4.83 feet

The Recharger® 330XLHD is a 30.5" (775 mm) tall, high capacity chamber. Typically when using this model, fewer chambers are required resulting in less labor and a smaller installation area. The Recharger® 330XLHD has the side portal internal manifold feature. HVLV® FC-24 Feed Connectors are inserted into the side portals to create the internal manifold.

Size (L x W x H) 8.5' x 52" x 30.5"

2.59 m x 1321 mm x 775 mm Installed Length 7' 2.13 m Recharger® 330XLHD Bare Chamber Storage Volumes Length Adjustment per Run 1.50' Elevation Incremental Storage Cumulative 0.46 m Volume Storage Chamber Storage 7.46 ft3/ft in. mm ft3/ft m3/m ft3 m3 ft3 m3 0.69 m3/m 30.5 775 0.000 0.000 0.000 0.000 52.213 1.479 52.21 ft3/unit 30 762 0.019 0.002 0.133 0.004 52.213 1.479 1.48 m3/unit 29 737 0.051 0.005 0.357 0.010 52.080 1.475 Min. Installed Storage 11.32 ft3/ft 28 711 0.084 0.008 0.588 0.017 51.723 1.465 1.05 m3/m 27 686 0.124 0.012 0.868 0.025 51.135 1.448 79.26 ft3/unit 26 660 0.150 0.014 1.05 0.030 50.267 1.424 2.24 m3/unit 25 635 0.173 0.016 1.211 0.034 49.217 1.394 Min. Area Required 33.83 ft2 24 609 0.191 0.018 1.337 0.038 48.006 1.360 2 3.14 m 23 584 0.207 0.019 1.449 0.041 46.669 1.322

Chamber Weight 73.0 lbs 22 559 0.221 0.021 1.547 0.044 45.220 1.281

33.11 kg 21 533 0.233 0.022 1.631 0.046 43.673 1.237

Shipping 30 chambers/skid 20 508 0.244 0.023 1.708 0.048 42.042 1.191

2,335 lbs/skid 19 483 0.254 0.024 1.778 0.050 40.334 1.142 10 skids/48' flatbed 18 457 0.264 0.025 1.848 0.052 38.556 1.092 Min. Center-to-Center Spacing 4.83' 17 432 0.271 0.025 1.897 0.054 36.708 1.040 1.47 m 16 406 0.283 0.026 1.981 0.056 34.811 0.986 Max. Allowable Cover 12' 15 381 0.294 0.027 2.058 0.058 32.830 0.930 3.66 m 14 356 0.296 0.027 2.072 0.059 30.772 0.871 13 330 0.299 0.028 2.093 0.059 28.700 0.813 Max. Inlet Opening in End Wall 24" HDPE, PVC 600 mm HDPE, PVC 12 305 0.301 0.028 2.107 0.060 26.607 0.754 11 279 0.303 0.028 2.121 0.060 24.500 0.694 Max. Allowable O.D. 10" HDPE, 12" PVC in Side Portal 10 254 0.304 0.028 2.128 0.060 22.379 0.634 250 mm HDPE, 300 mm PVC 9 229 0.306 0.028 2.142 0.061 20.251 0.574 Compatible Feed Connector HVLV FC-24 Feed Connector 8 203 0.313 0.029 2.191 0.062 18.109 0.513 Calculations are based on installed chamber length. 7 178 0.321 0.030 2.247 0.064 15.918 0.451 All above values are nominal. Min. installed storage includes 6" (152 mm) stone base, 6" (152 mm) stone above crown 6 152 0.322 0.030 2.254 0.064 13.671 0.387 of chamber and typical stone surround at 58" (1473 mm) center-to-center spacing. 5 127 0.323 0.030 2.261 0.064 11.417 0.323 Stone Foundation Depth 4 102 0.324 0.030 2.268 0.064 9.156 0.259 6" 12" 18" 3 76 0.325 0.030 2.275 0.064 6.888 0.195 152 mm 305 mm 457 mm 2 51 0.327 0.030 2.289 0.065 4.613 0.131 Chamber and Stone Storage Per 79.26 ft3 86.03 ft3 92.79 ft3 1 25 0.332 0.031 2.324 0.066 2.324 0.066 Chamber 2.24 m3 2.44 m3 2.63 m3 Total 7.459 0.693 52.213 1.479 52.213 1.479

Min. Effective Depth 3.54' 4.04' 4.54' Calculations are based on installed chamber length. 1.08 m 1.23 m 1.38 m Stone Required Per Chamber 2.50 yd3 3.13 yd3 3.76 yd3 Visit http://cultec.com/downloads/ 1.91 m3 2.39 m3 2.87 m3 for Product Downloads and CAD details. Calculations are based on installed chamber length. Includes 6" (305 mm) stone above crown of chamber and typical stone surround at 58"(1473 mm) center-to-center spacing and stone foundation as listed in table. Stone void calculated at 40%. For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. 1 © CULTEC, Inc., May 2019 SUB330XLHD 05-19 CULTEC Recharger® 330XLHD Stormwater Chamber

Three View Drawing

Typical Interlock Installation

MODEL EHD HIDDEN END

MODEL IHD

HIDDEN END

MODEL SHD MODEL IHD

SHOWN WITH SIDE PORTAL TRIMMED AND OPTIONAL CULTEC HVLV FEED CONNECTOR INSERTED.

For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. 2 © CULTEC, Inc., May 2019 SUB330XLHD 05-19 CULTEC Recharger® 330XLHD Stormwater Chamber CULTEC Recharger® 330XLHD Stormwater Chamber

Plan View Drawing

Typical Cross Section for Traffic Application

For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. 3 © CULTEC, Inc., May 2019 SUB330XLHD 05-19 CULTEC Recharger® 330XLHD Stormwater Chamber

CULTEC Recharger® 330XLHD Specifications

GENERAL CULTEC Recharger® 330XLHD chambers are designed for underground stormwater management. The chambers may be used for retention, recharging, detention or controlling the flow of on-site stormwater runoff.

CHAMBER PARAMETERS 1. The chambers shall be manufactured in the U.S.A. by CULTEC, Inc. of Brookfield, CT (cultec.com, 203-775-4416). 2. The chamber shall be vacuum thermoformed of polyethylene with a black interior and blue exterior. 3. The chamber shall be arched in shape. 4. The chamber shall be open-bottomed. 5. The chamber shall be joined using an interlocking overlapping rib method. Connections must be fully shouldered overlapping ribs, having no separate couplings or separate end walls. 6. The nominal chamber dimensions of the CULTEC Recharger® 330XLHD shall be 30.5 inches (775 mm) tall, 52 inches (1321 mm) wide and 8.5 feet (2.59 m) long. The installed length of a joined Recharger® 330XLHD shall be 7 feet (2.13 m). 7. Maximum inlet opening on the chamber end wall is 24 inches (600 mm) HDPE, PVC. 8. The chamber shall have two side portals to accept CULTEC HVLV® FC-24 Feed Connectors to create an internal manifold. Maximum allowable O.D. in the side portal is 10 inches (250 mm) HDPE and 12 inches (300 mm) PVC. 9. The nominal chamber dimensions of the CULTEC HVLV® FC-24 Feed Connector shall be 12 inches (305 mm) tall, 16 inches (406 mm) wide and 24.2 inches (614 mm) long. 10. The nominal storage volume of the Recharger® 330XLHD chamber shall be 7.459 ft3 / ft (0.693 m3 / m) - without stone. The nominal storage volume of a single Recharger® 330XLRHD Stand Alone unit shall be 63.40 ft3 (1.80 m3) - without stone. The nominal storage volume of a joined Recharger® 330XLIHD Intermediate unit shall be 52.213 ft3 (1.478 m3) - without stone. The nominal storage volume of the length adjustment amount per run shall be 11.19 ft3 (1.04 m3) - without stone. 11. The nominal storage volume of the HVLV® FC-24 Feed Connector shall be 0.913 ft3 / ft (0.026 m3 / m) - without stone. 12. The Recharger® 330XLHD chamber shall have fifty-six discharge holes bored into the sidewalls of the unit’s core to promote lateral conveyance of water. 13. The Recharger® 330XLHD chamber shall have 16 corrugations. 14. The end wall of the chamber, when present, shall be an integral part of the continuously formed unit. Separate end plates cannot be used with this unit. 15. The Recharger® 330XLRHD Stand Alone unit must be formed as a whole chamber having two fully formed integral end walls and having no separate end plates or separate end walls. 16. The Recharger® 330XLSHD Starter unit must be formed as a whole chamber having one fully formed integral end wall and one partially formed integral end wall with a lower transfer opening of 14 inches (356 mm) high x 34.5 inches (876 mm) wide. 17. The Recharger® 330XLIHD Intermediate unit must be formed as a whole chamber having one fully open end wall and one partially formed integral end wall with a lower transfer opening of 14 inches (356 mm) high x 34.5 inches (876 mm) wide. 18. The Recharger® 330XLEHD End unit must be formed as a whole chamber having one fully formed integral end wall and one fully open end wall and having no separate end plates or end walls. 19. The HVLV® FC-24 Feed Connector must be formed as a whole chamber having two open end walls and having no separate end plates or separate end walls. The unit shall fit into the side portals of the Recharger® 330XLHD and act as cross feed connections. 20. Chambers must have horizontal stiffening flex reduction steps between the ribs. 21. The chamber shall have a raised integral cap at the top of the arch in the center of each unit to be used as an optional inspection port or clean-out. 22. The units may be trimmed to custom lengths by cutting back to any corrugation on the large rib end. 23. The chamber shall be manufactured in an ISO 9001:2015 certified facility. 24. Maximum allowable cover over the top of the chamber shall be 12' (3.66 m). 25. The chamber shall be designed to withstand traffic loads when installed according to CULTEC's recommended installation instructions.

For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. 4 © CULTEC, Inc., May 2019 SUB330XLHD 05-19

APPENDIX G

NOAA Atlas 14, Volume 10, Version 3 Location name: Wilton, Connecticut, USA* Latitude: 41.1936°, Longitude: -73.4339° Elevation: 210.34 ft** * source: ESRI Maps ** source: USGS

POINT PRECIPITATION FREQUENCY ESTIMATES

Sanja Perica, Sandra Pavlovic, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Orlan Wilhite

NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials

PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval (years) Duration 1 2 5 10 25 50 100 200 500 1000 5-min 0.364 0.424 0.522 0.604 0.716 0.801 0.889 0.983 1.11 1.21 (0.282‑0.462) (0.328‑0.539) (0.403‑0.667) (0.463‑0.774) (0.532‑0.951) (0.582‑1.08) (0.627‑1.24) (0.661‑1.40) (0.720‑1.63) (0.768‑1.82) 10-min 0.515 0.600 0.739 0.855 1.01 1.14 1.26 1.39 1.58 1.72 (0.399‑0.655) (0.465‑0.764) (0.569‑0.943) (0.656‑1.10) (0.753‑1.35) (0.826‑1.53) (0.888‑1.75) (0.938‑1.99) (1.02‑2.31) (1.09‑2.57) 15-min 0.606 0.706 0.870 1.01 1.19 1.34 1.48 1.64 1.85 2.02 (0.469‑0.771) (0.547‑0.899) (0.671‑1.11) (0.772‑1.29) (0.886‑1.59) (0.970‑1.80) (1.05‑2.06) (1.10‑2.33) (1.20‑2.72) (1.28‑3.03) 30-min 0.848 0.986 1.21 1.40 1.66 1.86 2.06 2.26 2.54 2.75 (0.657‑1.08) (0.763‑1.25) (0.935‑1.55) (1.07‑1.80) (1.23‑2.20) (1.35‑2.50) (1.44‑2.85) (1.52‑3.22) (1.65‑3.73) (1.74‑4.12) 60-min 1.09 1.26 1.55 1.79 2.12 2.38 2.63 2.89 3.22 3.48 (0.844‑1.39) (0.979‑1.61) (1.20‑1.98) (1.38‑2.30) (1.57‑2.81) (1.72‑3.20) (1.84‑3.63) (1.94‑4.11) (2.09‑4.73) (2.20‑5.20) 2-hr 1.40 1.65 2.05 2.39 2.85 3.20 3.57 3.97 4.52 4.97 (1.09‑1.77) (1.28‑2.08) (1.59‑2.60) (1.84‑3.04) (2.13‑3.77) (2.34‑4.31) (2.53‑4.95) (2.68‑5.62) (2.94‑6.60) (3.16‑7.39) 3-hr 1.61 1.90 2.39 2.80 3.35 3.77 4.21 4.71 5.42 6.01 (1.26‑2.02) (1.49‑2.40) (1.86‑3.02) (2.16‑3.55) (2.51‑4.42) (2.77‑5.06) (3.01‑5.84) (3.19‑6.65) (3.53‑7.89) (3.82‑8.90) 6-hr 2.02 2.41 3.06 3.59 4.33 4.88 5.46 6.14 7.13 7.96 (1.59‑2.53) (1.90‑3.02) (2.40‑3.84) (2.80‑4.53) (3.27‑5.68) (3.61‑6.52) (3.93‑7.55) (4.17‑8.61) (4.66‑10.3) (5.08‑11.7) 12-hr 2.50 3.00 3.81 4.49 5.43 6.13 6.87 7.73 9.00 10.1 (1.98‑3.10) (2.37‑3.73) (3.01‑4.75) (3.52‑5.63) (4.12‑7.08) (4.56‑8.14) (4.97‑9.45) (5.27‑10.8) (5.90‑12.9) (6.44‑14.7) 24-hr 2.93 3.55 4.58 5.42 6.59 7.46 8.39 9.49 11.1 12.5 (2.33‑3.61) (2.83‑4.39) (3.63‑5.66) (4.27‑6.75) (5.03‑8.55) (5.58‑9.87) (6.11‑11.5) (6.49‑13.1) (7.32‑15.9) (8.04‑18.2) 2-day 3.27 4.03 5.29 6.33 7.76 8.82 9.97 11.4 13.5 15.4 (2.62‑4.00) (3.23‑4.94) (4.22‑6.50) (5.02‑7.82) (5.97‑10.0) (6.65‑11.6) (7.33‑13.7) (7.80‑15.6) (8.91‑19.2) (9.89‑22.1) 3-day 3.53 4.37 5.75 6.89 8.47 9.63 10.9 12.4 14.8 16.9 (2.84‑4.30) (3.51‑5.34) (4.60‑7.04) (5.48‑8.48) (6.53‑10.9) (7.29‑12.7) (8.03‑14.9) (8.55‑17.1) (9.79‑20.9) (10.9‑24.2) 4-day 3.78 4.67 6.13 7.34 9.00 10.2 11.6 13.2 15.7 17.8 (3.05‑4.60) (3.76‑5.69) (4.92‑7.48) (5.85‑9.00) (6.96‑11.5) (7.75‑13.4) (8.54‑15.7) (9.09‑18.0) (10.4‑22.1) (11.5‑25.5) 7-day 4.51 5.48 7.08 8.40 10.2 11.6 13.0 14.7 17.3 19.5 (3.65‑5.46) (4.44‑6.64) (5.71‑8.59) (6.73‑10.2) (7.92‑13.0) (8.78‑15.0) (9.61‑17.5) (10.2‑20.0) (11.5‑24.2) (12.6‑27.8) 10-day 5.23 6.25 7.93 9.33 11.2 12.7 14.2 16.0 18.5 20.7 (4.25‑6.30) (5.08‑7.55) (6.42‑9.60) (7.50‑11.3) (8.74‑14.2) (9.64‑16.3) (10.5‑18.9) (11.1‑21.6) (12.3‑25.8) (13.4‑29.3) 20-day 7.39 8.55 10.4 12.0 14.2 15.8 17.5 19.3 21.8 23.8 (6.05‑8.85) (6.98‑10.2) (8.49‑12.5) (9.71‑14.5) (11.0‑17.7) (12.0‑20.1) (12.8‑22.9) (13.4‑25.9) (14.6‑30.1) (15.5‑33.5) 30-day 9.18 10.4 12.5 14.2 16.5 18.3 20.1 21.9 24.3 26.2 (7.54‑11.0) (8.55‑12.4) (10.2‑14.9) (11.5‑17.0) (12.9‑20.5) (13.9‑23.0) (14.7‑26.0) (15.3‑29.2) (16.3‑33.5) (17.1‑36.8) 45-day 11.4 12.7 14.9 16.8 19.3 21.2 23.2 25.1 27.5 29.2 (9.39‑13.5) (10.5‑15.1) (12.3‑17.8) (13.7‑20.1) (15.1‑23.8) (16.2‑26.6) (17.0‑29.8) (17.6‑33.3) (18.5‑37.6) (19.1‑40.8) 60-day 13.2 14.7 17.0 18.9 21.6 23.7 25.7 27.6 30.1 31.8 (10.9‑15.7) (12.1‑17.4) (14.0‑20.2) (15.5‑22.6) (17.0‑26.6) (18.1‑29.6) (18.9‑32.9) (19.4‑36.6) (20.2‑41.1) (20.8‑44.3)

1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top

PF graphical Back to Top

Maps & aerials

Small scale terrain + – 3km

2mi

Large scale terrain

+ – 100km

60mi

Large scale map

+ – 100km

60mi

Large scale aerial + – 100km

60mi

US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: [email protected]

Disclaimer NOAA Atlas 14, Volume 10, Version 3 Location name: Wilton, Connecticut, USA* Latitude: 41.1936°, Longitude: -73.4339° Elevation: 210.34 ft** * source: ESRI Maps ** source: USGS

POINT PRECIPITATION FREQUENCY ESTIMATES

Sanja Perica, Sandra Pavlovic, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Orlan Wilhite

NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials

PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1 Average recurrence interval (years) Duration 1 2 5 10 25 50 100 200 500 1000 5-min 4.37 5.09 6.26 7.25 8.59 9.61 10.7 11.8 13.3 14.6 (3.38‑5.54) (3.94‑6.47) (4.84‑8.00) (5.56‑9.29) (6.38‑11.4) (6.98‑13.0) (7.52‑14.8) (7.93‑16.8) (8.64‑19.6) (9.22‑21.8) 10-min 3.09 3.60 4.43 5.13 6.08 6.82 7.56 8.36 9.46 10.3 (2.39‑3.93) (2.79‑4.58) (3.41‑5.66) (3.94‑6.58) (4.52‑8.08) (4.96‑9.20) (5.33‑10.5) (5.63‑11.9) (6.13‑13.9) (6.53‑15.4) 15-min 2.42 2.82 3.48 4.02 4.77 5.34 5.93 6.55 7.41 8.09 (1.88‑3.08) (2.19‑3.60) (2.68‑4.44) (3.09‑5.16) (3.54‑6.34) (3.88‑7.22) (4.18‑8.24) (4.41‑9.34) (4.81‑10.9) (5.12‑12.1) 30-min 1.70 1.97 2.42 2.80 3.32 3.71 4.11 4.52 5.08 5.50 (1.31‑2.16) (1.53‑2.51) (1.87‑3.09) (2.15‑3.59) (2.46‑4.39) (2.69‑5.00) (2.89‑5.69) (3.04‑6.44) (3.29‑7.45) (3.48‑8.23) 60-min 1.09 1.26 1.55 1.79 2.12 2.38 2.63 2.89 3.22 3.48 (0.844‑1.39) (0.979‑1.61) (1.20‑1.98) (1.38‑2.30) (1.57‑2.81) (1.72‑3.20) (1.84‑3.63) (1.94‑4.11) (2.09‑4.73) (2.20‑5.20) 2-hr 0.698 0.822 1.03 1.19 1.43 1.60 1.78 1.98 2.26 2.49 (0.544‑0.882) (0.640‑1.04) (0.796‑1.30) (0.921‑1.52) (1.07‑1.88) (1.17‑2.15) (1.27‑2.47) (1.34‑2.81) (1.47‑3.30) (1.58‑3.70) 3-hr 0.535 0.634 0.796 0.931 1.12 1.26 1.40 1.57 1.81 2.00 (0.418‑0.673) (0.495‑0.799) (0.620‑1.01) (0.721‑1.18) (0.837‑1.47) (0.923‑1.69) (1.00‑1.95) (1.06‑2.21) (1.18‑2.63) (1.27‑2.96) 6-hr 0.337 0.403 0.511 0.600 0.723 0.814 0.912 1.02 1.19 1.33 (0.265‑0.422) (0.317‑0.505) (0.400‑0.641) (0.467‑0.756) (0.545‑0.948) (0.602‑1.09) (0.656‑1.26) (0.696‑1.44) (0.778‑1.72) (0.848‑1.95) 12-hr 0.207 0.249 0.317 0.373 0.451 0.508 0.570 0.642 0.747 0.836 (0.164‑0.257) (0.197‑0.309) (0.249‑0.395) (0.292‑0.467) (0.342‑0.587) (0.378‑0.676) (0.412‑0.784) (0.437‑0.894) (0.490‑1.07) (0.535‑1.22) 24-hr 0.122 0.148 0.191 0.226 0.275 0.311 0.350 0.396 0.464 0.522 (0.097‑0.150) (0.118‑0.183) (0.151‑0.236) (0.178‑0.281) (0.210‑0.356) (0.233‑0.411) (0.255‑0.479) (0.270‑0.548) (0.305‑0.662) (0.335‑0.758) 2-day 0.068 0.084 0.110 0.132 0.162 0.184 0.208 0.237 0.282 0.320 (0.054‑0.083) (0.067‑0.103) (0.088‑0.135) (0.104‑0.163) (0.124‑0.209) (0.139‑0.242) (0.153‑0.284) (0.162‑0.326) (0.186‑0.399) (0.206‑0.461) 3-day 0.049 0.061 0.080 0.096 0.118 0.134 0.151 0.173 0.206 0.234 (0.039‑0.060) (0.049‑0.074) (0.064‑0.098) (0.076‑0.118) (0.091‑0.151) (0.101‑0.176) (0.112‑0.207) (0.119‑0.237) (0.136‑0.291) (0.151‑0.336) 4-day 0.039 0.049 0.064 0.076 0.094 0.107 0.120 0.137 0.163 0.186 (0.032‑0.048) (0.039‑0.059) (0.051‑0.078) (0.061‑0.094) (0.072‑0.120) (0.081‑0.140) (0.089‑0.164) (0.095‑0.188) (0.108‑0.230) (0.120‑0.266) 7-day 0.027 0.033 0.042 0.050 0.061 0.069 0.077 0.088 0.103 0.116 (0.022‑0.032) (0.026‑0.040) (0.034‑0.051) (0.040‑0.061) (0.047‑0.077) (0.052‑0.089) (0.057‑0.104) (0.061‑0.119) (0.068‑0.144) (0.075‑0.165) 10-day 0.022 0.026 0.033 0.039 0.047 0.053 0.059 0.066 0.077 0.086 (0.018‑0.026) (0.021‑0.031) (0.027‑0.040) (0.031‑0.047) (0.036‑0.059) (0.040‑0.068) (0.044‑0.079) (0.046‑0.090) (0.051‑0.108) (0.056‑0.122) 20-day 0.015 0.018 0.022 0.025 0.029 0.033 0.036 0.040 0.045 0.050 (0.013‑0.018) (0.015‑0.021) (0.018‑0.026) (0.020‑0.030) (0.023‑0.037) (0.025‑0.042) (0.027‑0.048) (0.028‑0.054) (0.030‑0.063) (0.032‑0.070) 30-day 0.013 0.014 0.017 0.020 0.023 0.025 0.028 0.030 0.034 0.036 (0.010‑0.015) (0.012‑0.017) (0.014‑0.021) (0.016‑0.024) (0.018‑0.028) (0.019‑0.032) (0.020‑0.036) (0.021‑0.041) (0.023‑0.047) (0.024‑0.051) 45-day 0.011 0.012 0.014 0.016 0.018 0.020 0.021 0.023 0.025 0.027 (0.009‑0.013) (0.010‑0.014) (0.011‑0.016) (0.013‑0.019) (0.014‑0.022) (0.015‑0.025) (0.016‑0.028) (0.016‑0.031) (0.017‑0.035) (0.018‑0.038) 60-day 0.009 0.010 0.012 0.013 0.015 0.016 0.018 0.019 0.021 0.022 (0.008‑0.011) (0.008‑0.012) (0.010‑0.014) (0.011‑0.016) (0.012‑0.018) (0.013‑0.021) (0.013‑0.023) (0.014‑0.025) (0.014‑0.029) (0.014‑0.031)

PF graphical Back to Top

Maps & aerials

Small scale terrain + – 3km

2mi

Large scale terrain

+ – 100km

60mi

Large scale map

+ – 100km

60mi

Large scale aerial + – 100km

60mi

US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: [email protected]

Disclaimer

APPENDIX H

Maintenance & Inspection Schedule )VCCBSE3E 8JMUPO$5

Regular inspection and maintenance of the stormwater management system and uphill areas is necessary to ensure proper operation. Inspections of the stormwater management system and pavement areas should be conducted monthly based on the following table: Site Areas: Inspection and Maintenance Check for: Corrective Measure: Erosion Install erosion control measures and provide stabilization measures Spillage Contain spill as close to source as possible with a dike of absorbent materials installed to protect drainage inlets, stormwater areas, or downstream wetlands and streams. All hazardous waste material, including absorbent materials must be disposed of by a licensed hazardous waste transporter and disposed of in an environmentally acceptable manner Sediment Accumulation Stabilize any disturbed areas uphill of where the sedimentation is occurring. Use temporary erosion control measures (i.e. silt fence, straw bales) to filter stormwater runoff. Trash Pick up and dispose of trash and litter in an environmentally acceptable manner.

At a minimum the following maintenance measures shall be provided at the frequency listed in the following table: Routine Maintenance Maintenance Measure: Frequency: Pavement Sweeping Minimum two times per year: during spring cleanup (after last snow event) and during fall cleanup (to remove fallen leaves) Pavement De-icing Apply anti-icing treatment prior to storms Apply deicing treatments as needed during and after snow storms and mixed precipitation events to control ice and compact snow not removed during plowing

Catch Basins and Pipe: Inspection and Maintenance Check for: Corrective Measure: Trash, Sediment, and Remove trash, sediment, and debris and dispose of in an environmentally Debris at Grate acceptable manner. Sediment & Trash Remove sediment from sumps if depth of deposits is greater than one-half Accumulation in Sump the depth from the bottom of the catch basin to the invert of the lowest pipe in the basin. Pipe blockages Flush pipes to remove blockages. TV inspect as required.

At a minimum the following maintenance measures shall be provided at the frequency listed in the following table: Routine Maintenance Maintenance Measure: Frequency: Sediment Removal Minimum one time per year: Remove sediment and trash from catch basin sumps and grates and pipe inverts. Dispose of sediment and trash in an environmentally acceptable manner. Maintenance & Inspection Schedule

Infiltration System Inspection and Maintenance

Check for: Corrective Measure: Sediment Accumulation Remove sediment when accumulation exceeds 3 inches throughout the length of the row per manufacturer’s specifications. Trash and Debris Remove trash and debris and dispose of in an environmentally acceptable manner.

At a minimum the following maintenance measures shall be provided at the frequency listed in the following table: Routine Maintenance Maintenance Measure: Frequency: Sediment Removal Inspected a minimum immediately after completion of the site’s construction, every 6 months for the first year of operation and annually after the end of the first year. Remove sediment accumulation as required. Dispose of sediment in an environmentally acceptable manner. Trash and Debris Minimum once per year. The infiltration system is to be inspected and maintained per manufacturer’s specifications. Product information is attached. Maintenance & Inspection Schedule 500 College Street, New Haven CT

STORMWATER MANAGEMENT SYSTEM INSPECTION AND MAINTENANCE CHECKLIST

Schwarzman Center Inspector: Date: Time: Site Conditions: Date Since Last Precipitation Event: Inspection Item Satisfactory? Comments or Corrective Measures Yes (Y) or No (N) Taken Site Areas Erosion Y N Spillage Y N Sediment Accumulation Y N Trash Y N Catch Basins and Pipe Trash, Sediment, and Debris at Inlet Grates Y N Sediment & Trash Accumulation in Sump Y N Pipe blockages Y N Infiltration System Sediment Accumulation Y N Trash and Debris Y N