Planning & Zoning Commission (linked)

Civil Engineers & Land Surveyors, P.C. 
 
BY:    MJO  .   
DATE:   6-1-25  . 
SUBJECT:   The Williams School Athletic Complex                               .   SHEET No.:    1   OF   1  . 
 
 
 
 
CHECKED:    LJM  .   DATE:   6-1-25  . 
  Stormwater Infiltration Trench Design Computations                               .   PROJECT No.:    25-02  . 
Summer Hill 
1. Narrative 
 
     The combination of the volume of stormwater runoff from the project catchment area temporarily stored and infiltrated in  
     the stormwater infiltration trench adjacent to the west side of the courts and the portion of runoff that will flow over the  
     undisturbed wooded area at the toe of the embankment on the west side of the courts and temporarily pond in  
     depression areas and infiltrate into the ground meets the runoff volume and pollutant reduction (Standard 1) guidance of  
     the current Connecticut Stormwater Quality Manual.   
 
     The design runoff volume is the surface water runoff volume from the project catchment area generated from a 1.3-inch  
     depth rainfall event, or the required retention volume of 100% of the computed water quality volume as given in the  
     manual.   
 
     The contributing catchment area to the infiltration trench includes the tennis and pickleball court surfaces and a small lawn  
     area immediately adjacent to the south side of the courts. 
 
     Surface water runoff from less frequent, greater rainfall depth events will leave the 310-foot length swale along the west 
     side of the courts and flow over the existing vegetated and proposed vegetated cover embankment fill slopes. 
 
     Detention of stormwater runoff from these events to control post-construction rates of discharge is not required.  There are  
     no adjoining properties, inland wetlands, watercourses, waterbodies, or culverts or other hydraulic structures in the  
     downstream vicinity of the toe of the embankment.  Surface water runoff will flow over the undisturbed wooded area at the  
     toe of the embankment, temporarily pond in depression areas, and infiltrate into the ground. 
 
2.  Required retention volume computed using the CT Stormwater Quality Manual equation 
 
     RRV = 100% WQV = (1.3)(R)(A)/12, where: 
 
     RRV, Required retention volume (cubic feet) 
     WQV, Water quality volume (cubic feet) 
     P,  Precipitation depth = 1.3 inches 
     R,  Volumetric runoff coefficient = 0.05 + 0.009(I) 
     I,   Post-development impervious area (percent) 
     A   Post-development site drainage area (square feet) 
 
     I = 96.0% 
     R = 0.05 + 0.009(96.0) = 0.91 
     A = 48,100 ft2  
 
     RRV = (1.3 in)(R)(A)/12 = (1.3 in)(0.91)(48,100 ft2)/12 = 4,742 ft3 
 
 
 
 
 
 
 
 
 
 
Remainder of this page left blank 

Project
By
Date
6-1-25
Location
Checked
Date
6-1-25
Circle one:
Present
Developed
DA 1
Soil name
Product
and
of
hydrologic
x
acres 
CN x area
group
mi2     
% 
(appendix A)
1/  Use only one CN source per line.
total product
106.32
total area
1.10
2.  Runoff
Storm #3
(Use P and CN with table 2-1, fig. 2-1,
or eqs. 2-3 and 2-4.)
in
in
Rainfall, P (24-hour)
Runoff, Q
Frequency
yr
96.7
CN (weighted)
=
=
=
1.06
unconnected/connected impervious
area ratio)
Fig. 2-4
0.04
hydrolgic condition;
Lawn
61
Table 2-2
MJO
Cover description
(cover type, treatment, and
percent impervious;
Area
1.  Runoff Curve Number (CN)
Waterford, Connecticut
CN 1/
LJM
Williams School Athletic Complex
Storm #2
97
1.10
106.32
103.88
2.44
-
Courts
B
Fig. 2-3
Totals =
Use CN =
Worksheet 2: Runoff curve number and runoff
98
Storm #1
(After Soil Conservation Service TR-55, Second Edition, June 1986)

CT-Waterford 2502 24-hr S1 
  Custom Rainfall=1.30"
25-02 Infiltration Trench
Prepared by Summer Hill Civil Engineers
Page 1
HydroCAD® 10.20-5c  s/n 10862  © 2023 HydroCAD Software Solutions LLC
Summary for Subcatchment 10: DA 1
Runoff
=
1.40 cfs @ 12.02 hrs,  Volume=
0.091 af,  Depth> 0.99"
     Routed to Pond 20 : Infiltration Trench
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.10 hrs, dt= 0.05 hrs
CT-Waterford 2502 24-hr S1 1-yr  Custom Rainfall=1.30"
Area (sf)
CN
Description
*
48,100
97
48,100
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
5.0
Direct Entry, 
Subcatchment 10: DA 1
Runoff
Hydrograph
Time  (hours)
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Flow  (cfs)
1
0
CT-Waterford 2502 24-hr S1 1-yr
Custom Rainfall=1.30"
Runoff Area=48,100 sf
Runoff Volume=0.091 af
Runoff Depth>0.99"
Tc=5.0 min
CN=97
1.40 cfs

CT-Waterford 2502 24-hr S1 
  Custom Rainfall=1.30"
25-02 Infiltration Trench
Prepared by Summer Hill Civil Engineers
Page 2
HydroCAD® 10.20-5c  s/n 10862  © 2023 HydroCAD Software Solutions LLC
Summary for Pond 20: Infiltration Trench
Inflow Area =
1.104 ac,
0.00% Impervious,  Inflow Depth > 0.99"    for  Custom event
Inflow
=
1.40 cfs @ 12.02 hrs,  Volume=
0.091 af
Outflow
=
0.18 cfs @ 12.58 hrs,  Volume=
0.091 af,  Atten= 87%,  Lag= 33.6 min
Discarded =
0.18 cfs @ 12.58 hrs,  Volume=
0.091 af
Routing by Stor-Ind method, Time Span= 0.00-24.10 hrs, dt= 0.05 hrs
Peak Elev= 62.07' @ 12.58 hrs   Surf.Area= 0.021 ac   Storage= 0.029 af
Plug-Flow detention time= 59.9 min calculated for 0.091 af (100% of inflow)
Center-of-Mass det. time= 59.7 min ( 862.2 - 802.5 )
Volume
Invert
Avail.Storage
Storage Description
#1
59.00'
0.024 af
3.00'W x 303.00'L x 3.10'H Prismatoid
0.065 af Overall - 0.005 af Embedded = 0.059 af  x 40.0% Voids
#2
61.00'
0.005 af
12.0"  Round Pipe Storage  Inside #1
L= 300.0'
0.029 af
Total Available Storage
Device
Routing     
Invert
Outlet Devices
#1
Discarded
59.00'
2.750 in/hr Exfiltration over Wetted area   
Discarded OutFlow  Max=0.18 cfs @ 12.58 hrs  HW=62.07'   (Free Discharge)
1=Exfiltration  (Exfiltration Controls 0.18 cfs)
Pond 20: Infiltration Trench
Inflow
Discarded
Hydrograph
Time  (hours)
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Flow  (cfs)
1
0
Inflow Area=1.104 ac
Peak Elev=62.07'
Storage=0.029 af
1.40 cfs
0.18 cfs

9
Custom Soil Resource Report
Soil Map
4585690
4585740
4585790
4585840
4585890
4585940
4585690
4585740
4585790
4585840
4585890
4585940
4585990
740120
740170
740220
740270
740320
740370
740420
740470
740520
740570
740120
740170
740220
740270
740320
740370
740420
740470
740520
740570
41°  23' 22'' N
72°  7' 42'' W
41°  23' 22'' N
72°  7' 21'' W
41°  23' 11'' N
72°  7' 42'' W
41°  23' 11'' N
72°  7' 21'' W
N
Map projection: Web Mercator   Corner coordinates: WGS84   Edge tics: UTM Zone 18N WGS84
0
100
200
400
600
Feet
0
30
60
120
180
Meters
Map Scale: 1:2,210 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.

MAP LEGEND
MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at 
1:12,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause 
misunderstanding of the detail of mapping and accuracy of soil 
line placement. The maps do not show the small areas of 
contrasting soils that could have been shown at a more detailed 
scale.
Please rely on the bar scale on each map sheet for map 
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL: 
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator 
projection, which preserves direction and shape but distorts 
distance and area. A projection that preserves area, such as the 
Albers equal-area conic projection, should be used if more 
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as 
of the version date(s) listed below.
Soil Survey Area: State of Connecticut, Eastern Part
Survey Area Data: Version 2, Aug 30, 2024
Soil map units are labeled (as space allows) for map scales 
1:50,000 or larger.
Date(s) aerial images were photographed: Jun 14, 2022—Oct 6, 
2022
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.
Custom Soil Resource Report
10

36
Custom Soil Resource Report
Map—Hydrologic Soil Group
4585690
4585740
4585790
4585840
4585890
4585940
4585690
4585740
4585790
4585840
4585890
4585940
4585990
740120
740170
740220
740270
740320
740370
740420
740470
740520
740570
740120
740170
740220
740270
740320
740370
740420
740470
740520
740570
41°  23' 22'' N
72°  7' 42'' W
41°  23' 22'' N
72°  7' 21'' W
41°  23' 11'' N
72°  7' 42'' W
41°  23' 11'' N
72°  7' 21'' W
N
Map projection: Web Mercator   Corner coordinates: WGS84   Edge tics: UTM Zone 18N WGS84
0
100
200
400
600
Feet
0
30
60
120
180
Meters
Map Scale: 1:2,210 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.

MAP LEGEND
MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at 
1:12,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause 
misunderstanding of the detail of mapping and accuracy of soil 
line placement. The maps do not show the small areas of 
contrasting soils that could have been shown at a more detailed 
scale.
Please rely on the bar scale on each map sheet for map 
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL: 
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator 
projection, which preserves direction and shape but distorts 
distance and area. A projection that preserves area, such as the 
Albers equal-area conic projection, should be used if more 
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as 
of the version date(s) listed below.
Soil Survey Area: State of Connecticut, Eastern Part
Survey Area Data: Version 2, Aug 30, 2024
Soil map units are labeled (as space allows) for map scales 
1:50,000 or larger.
Date(s) aerial images were photographed: Jun 14, 2022—Oct 6, 
2022
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.
Custom Soil Resource Report
37

State of Connecticut, Eastern Part
3—Ridgebury, Leicester, and Whitman soils, 0 to 8 percent slopes, 
extremely stony
Map Unit Setting
National map unit symbol: 2t2qt
Elevation: 0 to 1,480 feet
Mean annual precipitation: 36 to 71 inches
Mean annual air temperature: 39 to 55 degrees F
Frost-free period: 140 to 240 days
Farmland classification: Not prime farmland
Map Unit Composition
Ridgebury, extremely stony, and similar soils: 40 percent
Leicester, extremely stony, and similar soils: 35 percent
Whitman, extremely stony, and similar soils: 17 percent
Minor components: 8 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Ridgebury, Extremely Stony
Setting
Landform: Drumlins, ground moraines, hills, drainageways, depressions
Landform position (two-dimensional): Toeslope, footslope
Landform position (three-dimensional): Base slope, head slope
Down-slope shape: Concave
Across-slope shape: Concave
Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or 
schist
Typical profile
Oe - 0 to 1 inches: moderately decomposed plant material
A - 1 to 6 inches: fine sandy loam
Bw - 6 to 10 inches: sandy loam
Bg - 10 to 19 inches: gravelly sandy loam
Cd - 19 to 66 inches: gravelly sandy loam
Properties and qualities
Slope: 0 to 8 percent
Surface area covered with cobbles, stones or boulders: 9.0 percent
Depth to restrictive feature: 15 to 35 inches to densic material
Drainage class: Poorly drained
Runoff class: Very high
Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately 
low (0.00 to 0.14 in/hr)
Depth to water table: About 0 to 6 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 3.0 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Custom Soil Resource Report
14

Hydrologic Soil Group: D
Ecological site: F144AY009CT - Wet Till Depressions
Hydric soil rating: Yes
Description of Leicester, Extremely Stony
Setting
Landform: Ground moraines, hills, drainageways, depressions
Landform position (two-dimensional): Toeslope, footslope
Landform position (three-dimensional): Base slope
Down-slope shape: Concave, linear
Across-slope shape: Concave
Parent material: Coarse-loamy melt-out till derived from gneiss, granite, and/or 
schist
Typical profile
Oe - 0 to 1 inches: moderately decomposed plant material
A - 1 to 7 inches: fine sandy loam
Bg - 7 to 18 inches: fine sandy loam
BC - 18 to 24 inches: fine sandy loam
C1 - 24 to 39 inches: gravelly fine sandy loam
C2 - 39 to 65 inches: gravelly fine sandy loam
Properties and qualities
Slope: 0 to 8 percent
Surface area covered with cobbles, stones or boulders: 9.0 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Poorly drained
Runoff class: Very high
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high 
(0.14 to 14.17 in/hr)
Depth to water table: About 0 to 6 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: High (about 9.0 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Hydrologic Soil Group: B/D
Ecological site: F144AY009CT - Wet Till Depressions
Hydric soil rating: Yes
Description of Whitman, Extremely Stony
Setting
Landform: Drumlins, ground moraines, hills, drainageways, depressions
Landform position (two-dimensional): Toeslope
Landform position (three-dimensional): Base slope
Down-slope shape: Concave
Across-slope shape: Concave
Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or 
schist
Typical profile
Oi - 0 to 1 inches: peat
Custom Soil Resource Report
15

A - 1 to 10 inches: fine sandy loam
Bg - 10 to 17 inches: gravelly fine sandy loam
Cdg - 17 to 61 inches: fine sandy loam
Properties and qualities
Slope: 0 to 3 percent
Surface area covered with cobbles, stones or boulders: 9.0 percent
Depth to restrictive feature: 7 to 38 inches to densic material
Drainage class: Very poorly drained
Runoff class: Negligible
Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately 
low (0.00 to 0.14 in/hr)
Depth to water table: About 0 to 6 inches
Frequency of flooding: None
Frequency of ponding: Frequent
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 3.0 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Hydrologic Soil Group: D
Ecological site: F144AY009CT - Wet Till Depressions
Hydric soil rating: Yes
Minor Components
Woodbridge, extremely stony
Percent of map unit: 6 percent
Landform: Hills, drumlins, ground moraines
Landform position (two-dimensional): Backslope, footslope, summit
Landform position (three-dimensional): Crest, side slope
Down-slope shape: Concave
Across-slope shape: Linear
Hydric soil rating: No
Swansea
Percent of map unit: 2 percent
Landform: Bogs, swamps
Down-slope shape: Concave
Across-slope shape: Concave
Hydric soil rating: Yes
61B—Canton and Charlton fine sandy loams, 0 to 8 percent slopes, very 
stony
Map Unit Setting
National map unit symbol: 2w81v
Custom Soil Resource Report
16

Elevation: 0 to 1,480 feet
Mean annual precipitation: 36 to 71 inches
Mean annual air temperature: 39 to 55 degrees F
Frost-free period: 140 to 240 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Canton, very stony, and similar soils: 50 percent
Charlton, very stony, and similar soils: 35 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Canton, Very Stony
Setting
Landform: Moraines, hills, ridges
Landform position (two-dimensional): Summit, shoulder, backslope
Landform position (three-dimensional): Side slope, crest, nose slope
Down-slope shape: Convex, linear
Across-slope shape: Convex
Parent material: Coarse-loamy over sandy melt-out till derived from gneiss, 
granite, and/or schist
Typical profile
Oi - 0 to 2 inches: slightly decomposed plant material
A - 2 to 5 inches: fine sandy loam
Bw1 - 5 to 16 inches: fine sandy loam
Bw2 - 16 to 22 inches: gravelly fine sandy loam
2C - 22 to 67 inches: gravelly loamy sand
Properties and qualities
Slope: 0 to 8 percent
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: 19 to 39 inches to strongly contrasting textural 
stratification
Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high 
(0.14 to 14.17 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 3.4 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
Hydric soil rating: No
Description of Charlton, Very Stony
Setting
Landform: Ridges, ground moraines, hills
Landform position (two-dimensional): Backslope, shoulder, summit
Custom Soil Resource Report
17

Landform position (three-dimensional): Side slope, crest
Down-slope shape: Convex, linear
Across-slope shape: Convex
Parent material: Coarse-loamy melt-out till derived from granite, gneiss, and/or 
schist
Typical profile
Oe - 0 to 2 inches: moderately decomposed plant material
A - 2 to 4 inches: fine sandy loam
Bw - 4 to 27 inches: gravelly fine sandy loam
C - 27 to 65 inches: gravelly fine sandy loam
Properties and qualities
Slope: 0 to 8 percent
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high 
(0.14 to 14.17 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Moderate (about 8.7 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
Hydric soil rating: No
Minor Components
Chatfield, very stony
Percent of map unit: 5 percent
Landform: Ridges, hills
Landform position (two-dimensional): Backslope, shoulder, summit
Landform position (three-dimensional): Crest, side slope, nose slope
Down-slope shape: Convex
Across-slope shape: Linear, convex
Hydric soil rating: No
Leicester, very stony
Percent of map unit: 5 percent
Landform: Hills, drainageways, depressions, ground moraines
Landform position (two-dimensional): Toeslope, footslope
Landform position (three-dimensional): Base slope
Down-slope shape: Concave, linear
Across-slope shape: Concave
Hydric soil rating: Yes
Sutton, very stony
Percent of map unit: 5 percent
Landform: Ground moraines, hills
Landform position (two-dimensional): Footslope
Custom Soil Resource Report
18

Landform position (three-dimensional): Base slope
Down-slope shape: Concave
Across-slope shape: Linear
Hydric soil rating: No
62C—Canton and Charlton fine sandy loams, 3 to 15 percent slopes, 
extremely stony
Map Unit Setting
National map unit symbol: 2wks7
Elevation: 0 to 1,310 feet
Mean annual precipitation: 36 to 71 inches
Mean annual air temperature: 39 to 55 degrees F
Frost-free period: 140 to 240 days
Farmland classification: Not prime farmland
Map Unit Composition
Canton, extremely stony, and similar soils: 50 percent
Charlton, extremely stony, and similar soils: 35 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Canton, Extremely Stony
Setting
Landform: Moraines, hills, ridges
Landform position (two-dimensional): Backslope, shoulder, summit
Landform position (three-dimensional): Side slope, crest, nose slope
Down-slope shape: Convex, linear
Across-slope shape: Convex
Parent material: Coarse-loamy over sandy melt-out till derived from gneiss, 
granite, and/or schist
Typical profile
Oi - 0 to 2 inches: slightly decomposed plant material
A - 2 to 5 inches: fine sandy loam
Bw1 - 5 to 16 inches: fine sandy loam
Bw2 - 16 to 22 inches: gravelly fine sandy loam
2C - 22 to 67 inches: gravelly loamy sand
Properties and qualities
Slope: 3 to 15 percent
Surface area covered with cobbles, stones or boulders: 9.0 percent
Depth to restrictive feature: 19 to 39 inches to strongly contrasting textural 
stratification
Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high 
(0.14 to 14.17 in/hr)
Custom Soil Resource Report
19

Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 3.4 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
Hydric soil rating: No
Description of Charlton, Extremely Stony
Setting
Landform: Ridges, ground moraines, hills
Landform position (two-dimensional): Backslope, shoulder, summit
Landform position (three-dimensional): Side slope, crest
Down-slope shape: Convex, linear
Across-slope shape: Convex
Parent material: Coarse-loamy melt-out till derived from granite, gneiss, and/or 
schist
Typical profile
Oe - 0 to 2 inches: moderately decomposed plant material
A - 2 to 4 inches: fine sandy loam
Bw - 4 to 27 inches: gravelly fine sandy loam
C - 27 to 65 inches: gravelly fine sandy loam
Properties and qualities
Slope: 3 to 15 percent
Surface area covered with cobbles, stones or boulders: 9.0 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high 
(0.14 to 14.17 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Moderate (about 8.7 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
Hydric soil rating: No
Minor Components
Chatfield, extremely stony
Percent of map unit: 5 percent
Landform: Ridges, hills
Landform position (two-dimensional): Backslope, shoulder, summit
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Landform position (three-dimensional): Nose slope, side slope, crest
Down-slope shape: Convex
Across-slope shape: Linear, convex
Hydric soil rating: No
Leicester, extremely stony
Percent of map unit: 5 percent
Landform: Hills, drainageways, depressions, ground moraines
Landform position (two-dimensional): Toeslope, footslope
Landform position (three-dimensional): Base slope
Down-slope shape: Concave, linear
Across-slope shape: Concave
Hydric soil rating: Yes
Sutton, extremely stony
Percent of map unit: 5 percent
Landform: Ground moraines, hills
Landform position (two-dimensional): Footslope
Landform position (three-dimensional): Base slope
Down-slope shape: Concave
Across-slope shape: Linear
Hydric soil rating: No
62D—Canton and Charlton fine sandy loams, 15 to 35 percent slopes, 
extremely stony
Map Unit Setting
National map unit symbol: 2w81r
Elevation: 0 to 1,640 feet
Mean annual precipitation: 36 to 71 inches
Mean annual air temperature: 39 to 55 degrees F
Frost-free period: 145 to 240 days
Farmland classification: Not prime farmland
Map Unit Composition
Canton, extremely stony, and similar soils: 55 percent
Charlton, extremely stony, and similar soils: 30 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Canton, Extremely Stony
Setting
Landform: Moraines, hills, ridges
Landform position (two-dimensional): Backslope, summit, shoulder
Landform position (three-dimensional): Crest, nose slope, side slope
Down-slope shape: Convex, linear
Across-slope shape: Convex
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Parent material: Coarse-loamy over sandy melt-out till derived from gneiss, 
granite, and/or schist
Typical profile
Oi - 0 to 2 inches: slightly decomposed plant material
A - 2 to 5 inches: fine sandy loam
Bw1 - 5 to 16 inches: fine sandy loam
Bw2 - 16 to 22 inches: gravelly fine sandy loam
2C - 22 to 67 inches: gravelly loamy sand
Properties and qualities
Slope: 15 to 35 percent
Surface area covered with cobbles, stones or boulders: 9.0 percent
Depth to restrictive feature: 19 to 39 inches to strongly contrasting textural 
stratification
Drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high 
(0.14 to 14.17 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 3.4 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
Hydric soil rating: No
Description of Charlton, Extremely Stony
Setting
Landform: Ridges, ground moraines, hills
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Convex, linear
Across-slope shape: Convex
Parent material: Coarse-loamy melt-out till derived from granite, gneiss, and/or 
schist
Typical profile
Oe - 0 to 2 inches: moderately decomposed plant material
A - 2 to 4 inches: fine sandy loam
Bw - 4 to 27 inches: gravelly fine sandy loam
C - 27 to 65 inches: gravelly fine sandy loam
Properties and qualities
Slope: 15 to 35 percent
Surface area covered with cobbles, stones or boulders: 9.0 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high 
(0.14 to 14.17 in/hr)
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Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Moderate (about 8.7 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
Hydric soil rating: No
Minor Components
Hollis, extremely stony
Percent of map unit: 5 percent
Landform: Ridges, hills
Landform position (two-dimensional): Shoulder, backslope, summit
Landform position (three-dimensional): Crest, side slope, nose slope
Down-slope shape: Convex
Across-slope shape: Linear, convex
Hydric soil rating: No
Chatfield, extremely stony
Percent of map unit: 5 percent
Landform: Ridges, hills
Landform position (two-dimensional): Summit, backslope, shoulder
Landform position (three-dimensional): Crest, side slope, nose slope
Down-slope shape: Convex
Across-slope shape: Linear, convex
Hydric soil rating: No
Sutton, extremely stony
Percent of map unit: 5 percent
Landform: Ground moraines, hills
Landform position (two-dimensional): Footslope
Landform position (three-dimensional): Base slope
Down-slope shape: Concave
Across-slope shape: Linear
Hydric soil rating: No
67B—Narragansett silt loam, 3 to 8 percent slopes, very stony
Map Unit Setting
National map unit symbol: 9lq5
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
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Farmland classification: Farmland of statewide importance
Map Unit Composition
Narragansett and similar soils: 80 percent
Minor components: 20 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Narragansett
Setting
Landform: Till plains, hills
Down-slope shape: Linear
Across-slope shape: Convex
Parent material: Coarse-loamy eolian deposits over sandy and gravelly melt-out till 
derived from gneiss and/or schist and/or sandstone and shale
Typical profile
Ap - 0 to 6 inches: silt loam
Bw1 - 6 to 15 inches: silt loam
Bw2 - 15 to 24 inches: silt loam
Bw3 - 24 to 28 inches: gravelly silt loam
2C - 28 to 60 inches: very gravelly loamy coarse sand
Properties and qualities
Slope: 3 to 8 percent
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high 
(0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 6.3 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
Hydric soil rating: No
Minor Components
Charlton
Percent of map unit: 5 percent
Landform: Hills
Down-slope shape: Linear
Across-slope shape: Linear
Hydric soil rating: No
Broadbrook
Percent of map unit: 5 percent
Landform: Till plains, hills, drumlins
Down-slope shape: Linear
Across-slope shape: Concave
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Hydric soil rating: No
Leicester
Percent of map unit: 3 percent
Landform: Drainageways, depressions
Down-slope shape: Linear
Across-slope shape: Concave
Hydric soil rating: Yes
Unnamed, red parent material
Percent of map unit: 2 percent
Hydric soil rating: No
Canton
Percent of map unit: 2 percent
Landform: Hills
Down-slope shape: Linear
Across-slope shape: Convex
Hydric soil rating: No
Wapping
Percent of map unit: 2 percent
Landform: Till plains, hills
Down-slope shape: Linear
Across-slope shape: Linear
Hydric soil rating: No
Sutton, very stony
Percent of map unit: 1 percent
Landform: Drainageways, depressions
Down-slope shape: Concave
Across-slope shape: Linear
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.
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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 45 percent
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: More than 80 inches
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
Frequency of ponding: None
Available water supply, 0 to 60 inches: Low (about 5.9 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
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
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: 20 to 40 inches to lithic bedrock
Drainage class: Well drained
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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 supply, 0 to 60 inches: Low (about 3.3 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7s
Hydrologic Soil Group: B
Ecological site: F144AY034CT - Well Drained Till Uplands
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
Sutton, very stony
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: Ridges, hills
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
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74C—Narragansett-Hollis complex, 3 to 15 percent slopes, very rocky
Map Unit Setting
National map unit symbol: 9lqm
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
Narragansett and similar soils: 55 percent
Hollis and similar soils: 20 percent
Minor components: 25 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Narragansett
Setting
Landform: Till plains, hills
Down-slope shape: Linear
Across-slope shape: Convex
Parent material: Coarse-loamy eolian deposits over sandy and gravelly melt-out till 
derived from gneiss and/or schist and/or sandstone and shale
Typical profile
Ap - 0 to 6 inches: silt loam
Bw1 - 6 to 15 inches: silt loam
Bw2 - 15 to 24 inches: silt loam
Bw3 - 24 to 28 inches: gravelly silt loam
2C - 28 to 60 inches: very gravelly loamy coarse sand
Properties and qualities
Slope: 3 to 15 percent
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high 
(0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 6.3 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6s
Hydrologic Soil Group: B
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Ecological site: F144AY034CT - Well Drained Till Uplands
Hydric soil rating: No
Description of Hollis
Setting
Landform: Ridges, hills
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: 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 9 inches: channery fine sandy loam
Bw2 - 9 to 15 inches: gravelly fine sandy loam
2R - 15 to 80 inches: bedrock
Properties and qualities
Slope: 3 to 15 percent
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: 10 to 20 inches to lithic bedrock
Drainage class: Somewhat excessively drained
Runoff class: Low
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 supply, 0 to 60 inches: Very low (about 1.8 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6s
Hydrologic Soil Group: D
Ecological site: F144AY033MA - Shallow Dry Till Uplands
Hydric soil rating: No
Minor Components
Rock outcrop
Percent of map unit: 6 percent
Hydric soil rating: No
Charlton
Percent of map unit: 5 percent
Landform: Hills
Down-slope shape: Linear
Across-slope shape: Linear
Hydric soil rating: No
Chatfield
Percent of map unit: 5 percent
Landform: Ridges, hills
Down-slope shape: Convex
Across-slope shape: Linear
Hydric soil rating: No
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Leicester
Percent of map unit: 3 percent
Landform: Drainageways, depressions
Down-slope shape: Linear
Across-slope shape: Concave
Hydric soil rating: Yes
Canton
Percent of map unit: 2 percent
Landform: Hills
Down-slope shape: Linear
Across-slope shape: Convex
Hydric soil rating: No
Sutton, very stony
Percent of map unit: 2 percent
Landform: Drainageways, depressions
Down-slope shape: Concave
Across-slope shape: Linear
Hydric soil rating: No
Wapping
Percent of map unit: 2 percent
Landform: Till plains, hills
Down-slope shape: Linear
Across-slope shape: Linear
Hydric soil rating: No
85B—Paxton and Montauk fine sandy loams, 3 to 8 percent slopes, very 
stony
Map Unit Setting
National map unit symbol: 2w679
Elevation: 0 to 1,530 feet
Mean annual precipitation: 36 to 71 inches
Mean annual air temperature: 39 to 55 degrees F
Frost-free period: 145 to 240 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Paxton, very stony, and similar soils: 55 percent
Montauk, very stony, and similar soils: 30 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Paxton, Very Stony
Setting
Landform: Hills, ground moraines, drumlins
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Landform position (two-dimensional): Backslope, shoulder, summit
Landform position (three-dimensional): Crest, side slope
Down-slope shape: Convex, linear
Across-slope shape: Convex
Parent material: Coarse-loamy lodgment till derived from gneiss, granite, and/or 
schist
Typical profile
Oe - 0 to 2 inches: moderately decomposed plant material
A - 2 to 10 inches: fine sandy loam
Bw1 - 10 to 17 inches: fine sandy loam
Bw2 - 17 to 28 inches: fine sandy loam
Cd - 28 to 67 inches: gravelly fine sandy loam
Properties and qualities
Slope: 3 to 8 percent
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: 20 to 43 inches to densic material
Drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately 
low (0.00 to 0.14 in/hr)
Depth to water table: About 18 to 37 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 4.8 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6s
Hydrologic Soil Group: C
Ecological site: F144AY007CT - Well Drained Dense Till Uplands
Hydric soil rating: No
Description of Montauk, Very Stony
Setting
Landform: Recessionial moraines, ground moraines, hills, drumlins
Landform position (two-dimensional): Backslope, shoulder, summit
Landform position (three-dimensional): Side slope, crest
Down-slope shape: Convex, linear
Across-slope shape: Convex
Parent material: Coarse-loamy over sandy lodgment till derived from gneiss, 
granite, and/or schist
Typical profile
Oe - 0 to 2 inches: moderately decomposed plant material
A - 2 to 6 inches: fine sandy loam
Bw1 - 6 to 28 inches: fine sandy loam
Bw2 - 28 to 36 inches: sandy loam
2Cd - 36 to 74 inches: gravelly loamy sand
Properties and qualities
Slope: 3 to 8 percent
Surface area covered with cobbles, stones or boulders: 1.6 percent
Depth to restrictive feature: 20 to 43 inches to densic material
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Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately 
high (0.00 to 1.42 in/hr)
Depth to water table: About 18 to 37 inches
Frequency of flooding: None
Frequency of ponding: None
Maximum salinity: Nonsaline (0.0 to 1.9 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 5.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6s
Hydrologic Soil Group: C
Ecological site: F144AY007CT - Well Drained Dense Till Uplands
Hydric soil rating: No
Minor Components
Woodbridge, very stony
Percent of map unit: 8 percent
Landform: Ground moraines, hills, drumlins
Landform position (two-dimensional): Backslope, footslope, summit
Landform position (three-dimensional): Side slope, crest
Down-slope shape: Concave
Across-slope shape: Linear
Hydric soil rating: No
Ridgebury, very stony
Percent of map unit: 3 percent
Landform: Drumlins, depressions, ground moraines, hills, drainageways
Landform position (two-dimensional): Footslope, toeslope
Landform position (three-dimensional): Head slope, base slope
Down-slope shape: Concave
Across-slope shape: Concave
Hydric soil rating: Yes
Charlton, very stony
Percent of map unit: 3 percent
Landform: Hills
Landform position (two-dimensional): Shoulder, summit, backslope
Landform position (three-dimensional): Crest, side slope
Down-slope shape: Convex
Across-slope shape: Convex
Hydric soil rating: No
Stockbridge, very stony
Percent of map unit: 1 percent
Landform: Hills
Landform position (two-dimensional): Shoulder, backslope, summit
Landform position (three-dimensional): Crest, side slope
Down-slope shape: Concave
Across-slope shape: Linear
Hydric soil rating: No
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