Pavement_Memo_SWI.pdf

Page 1 of 2 Pages

Form FHWA-201 (Rev. 11-67)

U.S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

Use this form in lieu of transmittal slips within Dept. of Trans. When message comment is to be retained as file material. Do not prepare carbons. Not to be used in lieu of Form FHWA- 121 for informal correspondence. MINUTE-MEMO

M:\PROJECTS\GREE\11(1)\Techserv\Pavement\Correspondence\swm\GREE 11(1) Pavement Memo_stormwater.doc

SUBJECT: Stormwater Investigation for GREE 11(1)

TO MESSAGE/COMMENT FROM/DATE

S. Nawaz

PS&E

Project Manager

And:

R.

Kotadia Highway Design Manager

Through:

A. Teikari Highway Design Engineer

This memorandum summarizes the results of the subsurface exploration and infiltration evaluation for the proposed stormwater best management practices (BMP’s) for the project GREE 11(1) in Greenbelt National Park. The project location map is shown in Appendix 1.

BACKGROUND

The existing pavement at the Holly Picnic Area (Route 902) is proposed to be replaced with a porous pavement facility to a depth of up to 24-inches. Several unpaved islands and shoulder areas are proposed to be converted into infiltration swales to a depth of up to 36-inches in the vicinity of the Sweetgum Picnic Loop (Route 200), Laurel Picnic Area (Route 201), Good Luck Road Bike Trail Parking (Route 905), and the Baltimore Washington Parking median (I-295). The purpose of this study was to evaluate the infiltration rates and soil profiles of the subgrade at the proposed sites.

PROCEDURES

Subsurface Exploration EFLHD’s Subsurface Exploration Team drilled a total of 7 soil profile borings to a depth of 10 feet: 1 in the Holly Picnic Area, 2 in the Sweetgum Picnic Loop, 1 in the Laurel Picnic Area, 1 in the Good Luck Road Bike Trail Parking area, and 2 in the median of the Baltimore Washington Parkway. The locations of the soil profile borings and the log results are shown in Appendix 2 and Appendix 3, respectively.

Standard Penetration Tests (SPT) were performed using a 2¼-inch (outer diameter) split-spoon sampler in accordance with AASHTO T-206. Representative portions of the SPT soil samples were place into glass jars, labeled, and transported to the EFLHD Materials Testing Laboratory in Sevierville, TN for testing and storage.

Laboratory testing included gradation analysis by sieve and hydrometer (AASHTO T-11 and T-88). Results of the laboratory testing are shown in Appendices 4 and 7.

Infiltration Testing In addition to the soil profile borings, the team drove PVC casings with a 4-inch inside diameter to perform field infiltration testing at a total of 7 locations offset from the corresponding boring number. Casings were driven to a depth of 4.5-feet, including 6-inches of native soil. Soaking data and field measurements are shown in Appendix 5.

RESULTS

Soil Profiles In general, testing revealed that borings located in the Sweetgum Picnic Area encountered loamy fine sand, borings located in the Holly and Laurel Picnic Areas and Bike Trail encountered predominately clay and sandy clay soils, and borings located in the Baltimore Washington Parkway medians encountered sandy loam.

L. Willett Pavement Engineer

Through:

S. O’Brien Pavement Team Leader

Through:

S.

Whittemore Technical Services Engineer

04/08/2016

Page 2 of 2 Pages

Form FHWA-201 (Rev. 11-67)

U.S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

Use this form in lieu of transmittal slips within Dept. of Trans. When message comment is to be retained as file material. Do not prepare carbons. Not to be used in lieu of Form FHWA- 121 for informal correspondence. MINUTE-MEMO

M:\PROJECTS\GREE\11(1)\Techserv\Pavement\Correspondence\swm\GREE 11(1) Pavement Memo_stormwater.doc

TO MESSAGE/COMMENT FROM/DATE

N values recorded for the materials ranged from 2 to 36 blows per foot (bpf) indicating very loose to dense relative densities.

Borings were monitored for the presence of free water during the period of the field work. Groundwater was encountered at a depth of 7.0 ft in boring B-7, but groundwater was not encountered at any infiltration test location.

Infiltration The infiltration rates were averaged over the time interval for each testing location, and used to assign a hydrologic group to the soils. The average infiltration rate and corresponding hydrologic soil group results are shown in Table 1.

Table 1: Results of Infiltration Testing

Location Casing Depth (ft) Average

Infiltration Rate (in/hr)

Hydrologic Group

PT-1 4.5 7.95 A

PT-2 4.5 0 D

PT-3 4.5 0 D

PT-4 4.5 0 D

PT-5 4.5 0.03 D

PT-6 4.5 0 D

PT-7 4.5 1.86 A

APPENDICES

Appendix 1: Investigation Site Map Appendix 2: Boring Location Map Appendix 3: Boring Log Results Appendix 4: Laboratory Testing Results Appendix 5: Infiltration Data Appendix 6: Hydrologic Soil Survey Map Appendix 7: USDA Triangle Classification Calculations cc: Pavement (L.Willett), Highway Design (T. Nguyen), TS Reading w/ attachments

Appendix 1

Appendix 2

J-1

J-2

J-3

J-4

0.8

1.6

5.0

7.0

10.0

1.6

1.5

1.3

1.6 woh-1-3-4

3-5-6-8

5-13-15-19

8-13-13-15

9.6 inches TOPSOIL

Reddish brown SANDY SILT, trace gravel (moist)

Loose, reddish brown FINE SAND (moist)

Medium dense, brown FINE SAND and medium gravel (dry)

Medium dense, tan FINE SAND and medium to lage gravel (dry)

Bottom of borehole @ 10 ft

(Blows / ft)

Groundwater Depth:

At Completion:

La ye r D ep th ft)

D ep th S ca le ft)

Completed:

Hole Diameter:

Boring Method:

Rock Core Diam:

Vane Shear

Density, Color, Plasticity, Size, Proportions, Moisture T yp e

Boring Location:

Boring No.:

MATERIAL DESCRIPTION

Liquid Limit

Standard Penetration Test Data

B-1

Weather:

Operator:

Inspector:

R ec

SAMPLE

GREE 11(1) SWM Investigation

Greenbelt National Park hrs

B lo w s pe r in

Remarks:

G ra ph ic

Lo g

Auger Cuttings UD

30 in.

20 60 80

140 lbs/Auto 2 1/4 Caved at:

Hammer Drop:

Hammer Wt. & Type:

Surface Elevation: Boring Began: 2/4/16

HSA

2/4/16 Hutchins England

Cloudy 49

Project Name:

E le va tio n (f ee t)

Water Content % Plastic Limit

Sweetgum Picnic Island: N38D 59' 37.866. W76D 53' 42.096

Sheet: 1 of 1

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

BORING LOG

SPT Rock Core Penetrometer

N o.

Sample Types:

Encountered at:

After

Project Location:

B O

R

IN

G L

O G

G R

E E

1(

1) S

W M

.G P

J F

H W

A _V

A .G

D T

/8

/1

Appendix 3

J-3

J-4

0.9

5.0

7.0

10.0

0.9

1.7

2.0

2.0

1-1-3-2 woh-1-1-woh

2-5-8-12

5-8-7-8

10.8 inches TOPSOIL

Brown SANDY SILT (very moist)

Brown SILT, trace sand (moist)

Medium dense, brown SAND and medium gravel (very moist)

Botttom of borehole @ 10 ft

(Blows / ft)

Groundwater Depth:

At Completion:

La ye r D ep th ft)

D ep th S ca le ft)

Completed:

Hole Diameter:

Boring Method:

Rock Core Diam:

Vane Shear

Density, Color, Plasticity, Size, Proportions, Moisture T yp e

Boring Location:

Boring No.:

MATERIAL DESCRIPTION

Liquid Limit

Standard Penetration Test Data

B-2

Weather:

Operator:

Inspector:

R ec

SAMPLE

GREE 11(1) SWM Investigation

Greenbelt National Park hrs

B lo w s pe r in

Remarks:

G ra ph ic

Lo g

Auger Cuttings UD

30 in.

20 60 80

140 lbs/Auto 2 1/4 Caved at:

Hammer Drop:

Hammer Wt. & Type:

Surface Elevation: Boring Began: 2/4/16

HSA

2/4/16 Hutchins England

Cloudy 49

Project Name:

E le va tio n (f ee t)

Water Content % Plastic Limit

Sweetgum Picnic End of Loop: N38d 59' 35.538, W76d 53' 40.314

Sheet: 1 of 1

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

BORING LOG

SPT Rock Core Penetrometer

N o.

Sample Types:

Encountered at:

After

Project Location:

B O

R

IN

G L

O G

G R

E E

1(

1) S

W M

.G P

J F

H W

A _V

A .G

D T

/8

/1

J-3

J-4

0.5

1.0

1.8 2.0

2.4

5.7

7.0

9.0

9.6

10.0

1.4

1.3

1.7

1.6

3-4-7-8

4-5-6-7

5-6-8-10

5-9-11-12

5.4 inches ASPHALT CONCRETE PAVEMENT

6.6 inches AGGREGATE BASE COURSE

Reddish brown SANDY SILT (moist)

Loose, black SILTY SAND, some organic material

Loose, brown SILTY SAND

Reddish, tan SANDY CLAY

Reddish tan SANDY CLAY

Reddish tan SILT (very moist)

Medium dense, tan SAND, trace silt (very moist)

Bottom of borehole @ 10 ft

(Blows / ft)

Groundwater Depth:

At Completion:

La ye r D ep th ft)

D ep th S ca le ft)

Completed:

Hole Diameter:

Boring Method:

Rock Core Diam:

Vane Shear

Density, Color, Plasticity, Size, Proportions, Moisture T yp e

Boring Location:

Boring No.:

MATERIAL DESCRIPTION

Liquid Limit

Standard Penetration Test Data

B-3

Weather:

Operator:

Inspector:

R ec

SAMPLE

GREE 11(1) SWM Investigation

Greenbelt National Park hrs

B lo w s pe r in

Remarks:

G ra ph ic

Lo g

Auger Cuttings UD

30 in.

20 60 80

140 lbs/Auto 2 1/4 Caved at:

Hammer Drop:

Hammer Wt. & Type:

Surface Elevation: Boring Began: 2/4/16

HSA

2/4/16 Hutchins Hutchins

Cloudy 49

Project Name:

E le va tio n (f ee t)

Water Content % Plastic Limit

Holly Picnic Parking: N38d 59' 37.794, W76d 53' 24.786

Sheet: 1 of 1

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

BORING LOG

SPT Rock Core Penetrometer

N o.

Sample Types:

Encountered at:

After

Project Location:

B O

R

IN

G L

O G

G R

E E

1(

1) S

W M

.G P

J F

H W

A _V

A .G

D T

/8

/1

J-3

J-4

0.6

1.0

5.0

7.0

10.0

1.0

1.2

1.2

1.4

1-2-4-3

5-9-12-20

6-12-14-16

10-16-22-24

7.2 inches TOPSOIL

Tan SILT, trace sand (moist)

Reddish CLAY, trace silt (damp)

Medium soft, reddish, tan, grey SILTY CLAY (damp to dry)

Medium soft, reddish, tan, grey SILTY CLAY (damp to dry)

Bottom of borehole @ 10 ft

(Blows / ft)

Groundwater Depth:

At Completion:

La ye r D ep th ft)

D ep th S ca le ft)

Completed:

Hole Diameter:

Boring Method:

Rock Core Diam:

Vane Shear

Density, Color, Plasticity, Size, Proportions, Moisture T yp e

Boring Location:

Boring No.:

MATERIAL DESCRIPTION

Liquid Limit

Standard Penetration Test Data

B-4

Weather:

Operator:

Inspector:

R ec

SAMPLE

GREE 11(1) SWM Investigation

Greenbelt National Park hrs

B lo w s pe r in

Remarks:

G ra ph ic

Lo g

Auger Cuttings UD

30 in.

20 60 80

140 lbs/Auto 2 1/4 Caved at:

Hammer Drop:

Hammer Wt. & Type:

Surface Elevation: Boring Began: 2/4/16

HSA

2/4/16 Hutchins England

Cloudy 49

Project Name:

E le va tio n (f ee t)

Water Content % Plastic Limit

Laurel Picnic Island: N38d 59' 29.550, W76d 53' 31.254

Sheet: 1 of 1

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

BORING LOG

SPT Rock Core Penetrometer

N o.

Sample Types:

Encountered at:

After

Project Location:

B O

R

IN

G L

O G

G R

E E

1(

1) S

W M

.G P

J F

H W

A _V

A .G

D T

/8

/1

J-3

J-4

0.3

0.8

3.3 3.4

5.0

6.0

6.5

8.5

9.5

10.0

0.8

1.6

1.4

1.5

3-3-5-7

6-6-7-8

6-7-10-7

4-5-7-8

3.6 inches TOPSOIL

Reddish tan <<SILTY SAND, trace small gravel

Soft, reddish tan SANDY SILT

Brown FINE SAND

Soft, reddish tan CLAYEY SAND, trace gravel

Medium dense, tan FINE SAND (moist)

Reddish tan CLAYEY SAND, trace silt (moist)

Soft, reddish tan SILT, trace clay

Soft, reddish gray, grey SILT

Bottom of borehole @ 10 ft

(Blows / ft)

Groundwater Depth:

At Completion:

La ye r D ep th ft)

D ep th S ca le ft)

Completed:

Hole Diameter:

Boring Method:

Rock Core Diam:

Vane Shear

Density, Color, Plasticity, Size, Proportions, Moisture T yp e

Boring Location:

Boring No.:

MATERIAL DESCRIPTION

Liquid Limit

Standard Penetration Test Data

B-5

Weather:

Operator:

Inspector:

R ec

SAMPLE

GREE 11(1) SWM Investigation

Greenbelt National Park hrs

B lo w s pe r in

Remarks:

G ra ph ic

Lo g

Auger Cuttings UD

30 in.

20 60 80

140 lbs/Auto 2 1/4 Caved at:

Hammer Drop:

Hammer Wt. & Type:

Surface Elevation: Boring Began: 2/5/16

HSA

2/16/16 Hutchins Hutchins

Cloudy 49

Project Name:

E le va tio n (f ee t)

Water Content % Plastic Limit

Good Luck Road Entrance Ditch: N38d 58' 23.124, W76d 54' 08.928

Sheet: 1 of 1

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

BORING LOG

SPT Rock Core Penetrometer

N o.

Sample Types:

Encountered at:

After

Project Location:

B O

R

IN

G L

O G

G R

E E

1(

1) S

W M

.G P

J F

H W

A _V

A .G

D T

/8

/1

J-3

J-4

0.5

1.5

5.0

7.0

10.0

1.5

1.2

1.3

1.0

0-2-4-6

4-5-4-7

3-5-7-8

2-3-3-3

6 inches TOPSOIL

Loose, brown SILTY SAND (moist)

Loose, red, brown SILTY SAND (moist)

Soft, red, brown, grey SILT, trace clay (moist)

Soft, red, brown SILT, trace clay (moist)

Bottom of borehole @ 10 ft

(Blows / ft)

Groundwater Depth:

At Completion:

La ye r D ep th ft)

D ep th S ca le ft)

Completed:

Hole Diameter:

Boring Method:

Rock Core Diam:

Vane Shear

Density, Color, Plasticity, Size, Proportions, Moisture T yp e

Boring Location:

Boring No.:

MATERIAL DESCRIPTION

Liquid Limit

Standard Penetration Test Data

B-6

Weather:

Operator:

Inspector:

R ec

SAMPLE

GREE 11(1) SWM Investigation

Greenbelt National Park hrs

B lo w s pe r in

Remarks:

G ra ph ic

Lo g

Auger Cuttings UD

30 in.

20 60 80

140 lbs/Auto 2 1/4 Caved at:

Hammer Drop:

Hammer Wt. & Type:

Surface Elevation: Boring Began: 2/6/16

HSA

2/6/16 Hutchins Hutchins

Cloudy 49

Project Name:

E le va tio n (f ee t)

Water Content % Plastic Limit

BW Parkway N of Good Luck Rd.: N38d 58' 28.428, W76d 53' 50.604

Sheet: 1 of 1

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

BORING LOG

SPT Rock Core Penetrometer

N o.

Sample Types:

Encountered at:

After

Project Location:

B O

R

IN

G L

O G

G R

E E

1(

1) S

W M

.G P

J F

H W

A _V

A .G

D T

/8

/1

J-3

J-4

0.3

2.0

4.4 4.5

5.0

7.0

9.5

10.0

1.5

1.8

1.9

1.9

0-2-4-7

3-11-8-11

4-5-16-24

4-8-10-11

3.6 inches TOPSOIL

Reddish brown SANDY SILT (moist)

Reddish brown SANDY SILT (moist)

Light tan SILT

Light brown SANDY SILT, trace medium gravel (moist)

Medium dense, brown SAND, some medium gravel (wet)

Medium dense, light brown SAND, some medium gravel (wet)

Light tan SILT (wet)

Bottom of borehole @ 10 ft

(Blows / ft)

7.0 ft Groundwater Depth:

At Completion:

La ye r D ep th ft)

D ep th S ca le ft)

Completed:

Hole Diameter:

Boring Method:

Rock Core Diam:

Vane Shear

Density, Color, Plasticity, Size, Proportions, Moisture T yp e

Boring Location:

Boring No.:

MATERIAL DESCRIPTION

Liquid Limit

Standard Penetration Test Data

B-7

Weather:

Operator:

Inspector:

R ec

SAMPLE

GREE 11(1) SWM Investigation

Greenbelt National Park hrs

B lo w s pe r in

Remarks:

G ra ph ic

Lo g

Auger Cuttings UD

30 in.

20 60 80

140 lbs/Auto 2 1/4 Caved at:

Hammer Drop:

Hammer Wt. & Type:

Surface Elevation: Boring Began: 2/6/16

HSA

2/6/16 Hutchins Hutchins

Cloudy 49

Project Name:

E le va tio n (f ee t)

Water Content % Plastic Limit

BW Parkway S of Good Luck Rd.: N38d 58' 17.568, W76d 53' 58.338

Sheet: 1 of 1

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

BORING LOG

SPT Rock Core Penetrometer

N o.

Sample Types:

Encountered at:

After

Project Location:

B O

R

IN

G L

O G

G R

E E

1(

1) S

W M

.G P

J F

H W

A _V

A .G

D T

/8

/1

Project:

Remarks:Client:Project No.

AASHTOUSCSMATERIAL DESCRIPTION

CuCcD10D15D30D50D60D85PLLL

Particle Size Distribution Report

P E

R C

E N

T F

IN

E

R

100 10 1 0.1 0.01 0.001200 GRAIN SIZE - mm

% + 3"

% GRAVEL

CRS. FINE

% SAND

CRS. MEDIUM FINE

% FINES

SILT CLAY

in in in

1- 1/ in in

3/ in

1/ in

3/ in

#4 #1

#2

#3

#4

#6

#1

#1

#2

0.0 0.0 3.5 4.7 42.5 37.8 1.8 9.7

FHWA/EFLHDGREE 11(1)

99.9014.730.00590.1110.2250.4340.5871.38

Greenbelt Park

Particle Size Distribution Report

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

Location: B-1/J-2

0.0 0.0 14.0 4.1 40.0 31.4 2.7 7.8

32.734.400.02310.1310.2780.5510.7574.24

Location: B-1/J-3

0.0 0.0 1.6 13.2 5.1 24.8 33.8 21.5

0.00200.01160.05000.1021.96

Location: B-2/J-2

Appendix 4

AASHTOUSCSMATERIAL DESCRIPTION

CuCcD10D15D30D50D60D85PLLL

Particle Size Distribution Report

P E

R C

E N

T F

IN

E

R

100 10 1 0.1 0.01 0.001200 GRAIN SIZE - mm

% + 3"

% GRAVEL

CRS. FINE

% SAND

CRS. MEDIUM FINE

% FINES

SILT CLAY

in in in

1- 1/ in in

3/ in

1/ in

3/ in

#4 #1

#2

#3

#4

#6

#1

#1

#2

0.0 0.0 0.0 8.9 1.6 19.6 34.3 35.6

FHWA/EFLHDGREE 11(1)

0.00250.01580.03470.279

Greenbelt Park

Particle Size Distribution Report

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

Location: B-3/J-2

0.0 0.0 0.0 15.7 1.2 12.6 25.8 44.7

0.00820.02462.13

Location: B-4/J-2

0.0 0.0 3.8 24.0 1.0 4.8 19.7 46.7

0.00850.04143.35

Location: B-4/J-3

AASHTOUSCSMATERIAL DESCRIPTION

CuCcD10D15D30D50D60D85PLLL

Particle Size Distribution Report

P E

R C

E N

T F

IN

E

R

100 10 1 0.1 0.01 0.001200 GRAIN SIZE - mm

% + 3"

% GRAVEL

CRS. FINE

% SAND

CRS. MEDIUM FINE

% FINES

SILT CLAY

in in in

1- 1/ in in

3/ in

1/ in

3/ in

#4 #1

#2

#3

#4

#6

#1

#1

#2

0.0 0.0 3.5 1.8 14.7 33.8 22.9 23.3

FHWA/EFLHDGREE 11(1)

0.00160.01080.09600.1600.587

Greenbelt Park

Particle Size Distribution Report

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

Location: B-5/J-2

0.0 0.0 0.0 0.0 34.7 38.6 7.4 19.3

0.00250.1010.2440.3500.972

Location: B-5/J-3

0.0 0.0 5.4 17.7 8.5 12.6 21.5 34.3

0.00200.03560.1212.95

Location: B-6/J-2

AASHTOUSCSMATERIAL DESCRIPTION

CuCcD10D15D30D50D60D85PLLL

Particle Size Distribution Report

P E

R C

E N

T F

IN

E

R

100 10 1 0.1 0.01 0.001200 GRAIN SIZE - mm

% + 3"

% GRAVEL

CRS. FINE

% SAND

CRS. MEDIUM FINE

% FINES

SILT CLAY

in in in

1- 1/ in in

3/ in

1/ in

3/ in

#4 #1

#2

#3

#4

#6

#1

#1

#2

0.0 0.0 14.2 6.1 25.7 30.0 16.8 7.2

FHWA/EFLHDGREE 11(1)

21.940.770.02630.04260.1080.3440.5764.45

Greenbelt Park

Particle Size Distribution Report

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

Location: B-7/J-2

0.0 0.0 10.4 17.1 23.5 25.6 13.7 9.7

103.451.460.00910.04430.1120.4580.9453.72

Location: B-7/J-3

Appendix 5

Date Time Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/6/2016 12:10 PM 1.88 -- --

2/7/2016 7:09 AM Dry 1.88 22.56 N/A

Date Time Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/7/2016 7:43 AM 1.98 -- -- Start test (added water)

2/7/2016 8:46 AM 2.97 0.99 11.88 11.88

2/7/2016 8:47 AM 1.96 -- -- Added water

2/7/2016 9:43 AM 2.74 0.78 9.36 9.36

2/7/2016 9:43 AM 1.94 -- -- Added water

2/7/2016 10:46 AM 2.82 0.88 10.56 10.56

2/7/2016 10:46 AM 1.95 -- -- Added water

2/7/2016 12:04 PM 1.95 0 0 0

2/7/2016 12:05 PM

Notes: Bottom of casing set at 4.5 ft below grade Casing diameter is 4 inches (inside)

0.5 ft native soil plug

0.5 ft casing above ground Depth to water surface measured from top of casing

Remove casing

Infiltration Testing Data

Soaking Data

Location PT-1

GREE 11(1) Stormwater Infiltration Field Measurements

Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/6/2016 12:07 PM 1.98 -- --

2/7/2016 7:45 AM 2.01 0.03 0.36 N/A

Date Time Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/7/2016 7:45 AM 2.01 -- -- Start test

2/7/2016 8:49 AM 2.01 0 0 0

2/7/2016 9:46 AM 2.01 0 0 0

2/7/2016 10:47 AM 2.01 0 0 0

2/7/2016 12:08 PM 2.01 0 0 0

2/7/2016 12:08 PM

Notes: Bottom of casing set at 4.5 ft below grade Casing diameter is 4 inches (inside)

0.5 ft native soil plug

0.5 ft casing above ground Depth to water surface measured from top of casing

GREE 11(1) Stormwater Infiltration Field Measurements

Location PT-2

Soaking Data

Infiltration Testing Data

Remove casing

Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/6/2016 11:59 AM 1.85 -- --

2/7/2016 7:03 AM 1.87 0.02 0.24 N/A

Date Time Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/7/2016 7:03 AM 1.87 -- -- Start test

2/7/2016 8:40 AM 1.87 0 0 0

2/7/2016 9:39 AM 1.87 0 0 0

2/7/2016 10:42 AM 1.87 0 0 0

2/7/2016 11:41 AM 1.86 -0.01 -0.12 -0.12

2/7/2016 11:44 AM

Notes: Bottom of casing set at 4.5 ft below grade Casing diameter is 4 inches (inside)

0.5 ft native soil plug

0.5 ft casing above ground Depth to water surface measured from top of casing

GREE 11(1) Stormwater Infiltration Field Measurements

Location PT-3

Soaking Data

Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/6/2016 12:19 PM 1.98 -- --

2/7/2016 7:53 AM 2.00 0.02 0.24 N/A

Date Time Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/7/2016 7:53 AM 2.00 -- -- Start test

2/7/2016 8:54 AM 2.00 0 0 0

2/7/2016 9:54 AM 2.00 0 0 0

2/7/2016 10:53 AM 2.00 0 0 0

2/7/2016 12:15 PM 2.00 0 0 0

2/7/2016 12:17 PM

Notes: Bottom of casing set at 4.5 ft below grade Casing diameter is 4 inches (inside)

0.5 ft native soil plug

0.5 ft casing above ground Depth to water surface measured from top of casing

GREE 11(1) Stormwater Infiltration Field Measurements

Location PT-4

Soaking Data

Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/6/2016 12:32 PM 1.17 -- --

2/7/2016 8:05 AM 1.22 0.05 0.6 N/A

Date Time Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/7/2016 8:05 AM 1.22 -- -- Start test

2/7/2016 9:04 AM 1.22 0 0 0

2/7/2016 10:03 AM 1.23 0.01 0.12 0.12

2/7/2016 11:02 AM 1.23 0 0 0

2/7/2016 12:26 PM 1.23 0 0 0

2/7/2016 12:27 PM

Notes: Bottom of casing set at 4.5 ft below grade Casing diameter is 4 inches (inside)

0.5 ft native soil plug

0.5 ft casing above ground Depth to water surface measured from top of casing

GREE 11(1) Stormwater Infiltration Field Measurements

Location PT-5

Soaking Data

Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/6/2016 12:47 PM 1.97 -- --

2/7/2016 8:22 AM 1.97 0.00 0 N/A

Date Time Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/7/2016 8:22 AM 1.97 -- -- Start test

2/7/2016 9:15 AM 1.97 0 0 0

2/7/2016 10:13 AM 1.97 0 0 0

2/7/2016 11:12 AM 1.97 0 0 0

2/7/2016 12:39 PM 1.97 0 0 0

2/7/2016 12:42 PM

Notes: Bottom of casing set at 4.5 ft below grade Casing diameter is 4 inches (inside)

0.5 ft native soil plug

0.5 ft casing above ground Depth to water surface measured from top of casing

GREE 11(1) Stormwater Infiltration Field Measurements

Location PT-6

Soaking Data

Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/6/2016 12:53 PM 1.98 -- --

2/7/2016 8:27 AM 3.80 1.82 21.84 N/A

Date Time Depth to Water

Surface (ft) Drop (ft) Drop (in) Infiltration Rate (in/hr)

2/7/2016 8:28 AM 1.96 -- -- Start test (added water)

2/7/2016 9:18 AM 2.09 0.13 1.56 1.56

2/7/2016 10:19 AM 2.25 0.16 1.92 1.92

2/7/2016 11:16 AM 2.36 0.11 1.32 1.32

2/7/2016 11:17 AM 1.96 -- -- Added water

2/7/2016 12:46 PM 2.18 0.22 2.64 2.64

2/7/2016 12:48 PM

Notes: Bottom of casing set at 4.5 ft below grade Casing diameter is 4 inches (inside)

0.5 ft native soil plug

0.5 ft casing above ground Depth to water surface measured from top of casing

GREE 11(1) Stormwater Infiltration Field Measurements

Location PT-7

Soaking Data

Hydrologic Soil Group—Prince George's County, Maryland (GREE 11(1) Greenbelt National Park)

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

3/30/2016

333400 333900 334400 334900 335400 335900 336400 336900 337400 337900

333400 333900 334400 334900 335400 335900 336400 336900 337400 337900

38° 59' 55'' N

5'

7' ' W

38° 59' 55'' N

2'

'' W

38° 58' 9'' N

5'

7' ' W

38° 58' 9'' N

2'

'' W

N

Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 1000 2000 4000 6000

Feet 0 300 600 1200 1800

Meters Map Scale: 1:23,000 if printed on A landscape (11" x 8.5") sheet.

Appendix 6

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.

Please rely on the bar scale on each map sheet for map measurements.

Source of Map: Natural Resources Conservation Service Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov 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: Prince George's County, Maryland Survey Area Data: Version 13, Sep 30, 2015

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

Date(s) aerial images were photographed: Apr 14, 2011—Mar 2, The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident.

Hydrologic Soil Group—Prince George's County, Maryland (GREE 11(1) Greenbelt National Park)

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

3/30/2016

Hydrologic Soil Group

Hydrologic Soil Group— Summary by Map Unit — Prince George's County, Maryland (MD033)

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

BaB Beltsville silt loam, 2 to 5 percent slopes

C 45.8 3.1%

BaC Beltsville silt loam, 5 to 10 percent slopes

C 13.8 0.9%

BuB Beltsville-Urban land complex, 0 to 5 percent slopes

C 0.2 0.0%

CaB Chillum silt loam, 0 to 5 percent slopes

C 13.6 0.9%

CaC Chillum silt loam, 5 to 10 percent slopes

C 3.3 0.2%

CaD Chillum silt loam, 10 to 15 percent slopes

C 23.8 1.6%

CcC Christiana-Downer complex, 5 to 10 percent slopes

D 239.1 15.9%

CcD Christiana-Downer complex, 10 to 15 percent slopes

D 176.0 11.7%

CcE Christiana-Downer complex, 15 to 25 percent slopes

D 47.4 3.2%

CcF Christiana-Downer complex, 25 to 40 percent slopes

D 3.3 0.2%

CdD Christiana-Downer- Urban land complex, 5 to 15 percent slopes

D 59.5 4.0%

Ch Codorus-Hatboro-Urban land complex, frequently flooded

D 2.2 0.1%

CrE Croom gravelly sandy loam, 15 to 25 percent slopes

C 2.3 0.2%

DoB Downer-Hammonton complex, 2 to 5 percent slopes

A 8.8 0.6%

DoC Downer-Hamonton complex, 5 to 10 percent slopes

A 5.6 0.4%

DoD Downer-Hammonton complex, 10 to 15 percent slopes

A 12.4 0.8%

Hydrologic Soil Group—Prince George's County, Maryland GREE 11(1) Greenbelt National Park

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

DuB Downer-Hammonton- Urban land complex, 0 to 5 percent slopes

A 0.7 0.0%

EkA Elkton silt loam, 0 to 2 percent slopes

C/D 12.8 0.9%

EwB Evesboro-Downer complex 0 to 5 percent slopes

A 13.1 0.9%

EwC Evesboro-Downer complex, 5 to 10 percent slopes

A 41.5 2.8%

EwD Evesboro-Downer complex, 10 to 15 percent slopes

A 6.7 0.4%

EwE Evesboro-Downer complex, 15 to 25 percent slopes

A 6.1 0.4%

GbB Galestown-Urban land complex, 0 to 5 percent slopes

A 9.5 0.6%

Iu Issue-Urban land complex, occasionally flooded

B/D 20.8 1.4%

RcB Russett-Christiana complex, 2 to 5 percent slopes

C 98.0 6.5%

RuB Russett-Christiana- Urban land complex, 0 to 5 percent slopes

D 59.9 4.0%

SaB Sassafras sandy loam, 2 to 5 percent slopes

B 7.8 0.5%

SaC Sassafras sandy loam, 5 to 10 percent slopes

B 91.3 6.1%

ScC Sassafras-Croom complex, 5 to 10 percent slopes

B 11.2 0.7%

SnB Sassafras-Urban land complex, 0 to 5 percent slopes

B 13.8 0.9%

SOD Sassafras and Croom soils, 10 to 15 percent slopes

C 17.7 1.2%

SOE Sassafras and Croom soils, 15 to 25 percent slopes

C 34.2 2.3%

SOF Sassafras and Croom soils, 25 to 40 percent slopes

C 21.4 1.4%

UdaF Udorthents, highway, 0 to 65 percent slopes

141.1 9.4%

Hydrologic Soil Group—Prince George's County, Maryland GREE 11(1) Greenbelt National Park

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

UdgB Udorthents, reclaimed gravel pits, 0 to 5 percent slopes

C 25.8 1.7%

UdgE Udorthents, reclaimed gravel pits, 15 to 25 percent slopes

C 4.5 0.3%

UdrF Udorthents, refuse substratum, 0 to 50 percent slopes

C 10.6 0.7%

UrrB Urban land-Russett- Christiana complex, 0 to 5 percent slopes

D 30.0 2.0%

ZS Zekiah and Issue soils, frequently flooded

B/D 164.4 11.0%

Totals for Area of Interest 1,499.9 100.0%

Description

Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms.

The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows:

Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission.

Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission.

Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission.

Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material.

These soils have a very slow rate of water transmission.

If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes.

Hydrologic Soil Group—Prince George's County, Maryland GREE 11(1) Greenbelt National Park

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

Rating Options

Aggregation Method: Dominant Condition

Aggregation is the process by which a set of component attribute values is reduced to a single value that represents the map unit as a whole.

A map unit is typically composed of one or more "components". A component is either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute being aggregated, the first step of the aggregation process is to derive one attribute value for each of a map unit's components. From this set of component attributes, the next step of the aggregation process derives a single value that represents the map unit as a whole. Once a single value for each map unit is derived, a thematic map for soil map units can be rendered. Aggregation must be done because, on any soil map, map units are delineated but components are not.

For each of a map unit's components, a corresponding percent composition is recorded. A percent composition of 60 indicates that the corresponding component typically makes up approximately 60% of the map unit. Percent composition is a critical factor in some, but not all, aggregation methods.

The aggregation method "Dominant Condition" first groups like attribute values for the components in a map unit. For each group, percent composition is set to the sum of the percent composition of all components participating in that group. These groups now represent "conditions" rather than components. The attribute value associated with the group with the highest cumulative percent composition is returned. If more than one group shares the highest cumulative percent composition, the corresponding "tie-break" rule determines which value should be returned. The "tie-break" rule indicates whether the lower or higher group value should be returned in the case of a percent composition tie. The result returned by this aggregation method represents the dominant condition throughout the map unit only when no tie has occurred.

Component Percent Cutoff: None Specified

Components whose percent composition is below the cutoff value will not be considered. If no cutoff value is specified, all components in the database will be considered. The data for some contrasting soils of minor extent may not be in the database, and therefore are not considered.

Tie-break Rule: Higher

The tie-break rule indicates which value should be selected from a set of multiple candidate values, or which value should be selected in the event of a percent composition tie.

Hydrologic Soil Group—Prince George's County, Maryland GREE 11(1) Greenbelt National Park

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

Appendix 7

Boring Sample Gravel Total Sand Total Fines Total Total SAND SILT CLAY TOTAL crs fine crs med fine Silt Clay

B‐1 J‐2 0 3.5 3.5 4.7 42.5 37.8 85 1.8 9.7 11.5 100 88.1 1.9 10.1 100 J‐3 0 14 14 4.1 40 31.4 75.5 2.7 7.8 10.5 100 87.8 3.1 9.1 100

B‐2 J‐2 0 1.6 1.6 13.2 5.1 24.8 43.1 33.8 21.5 55.3 100 43.8 34.3 21.8 100 B‐3 J‐2 0 0 0 8.9 1.6 19.6 30.1 34.3 35.6 69.9 100 30.1 34.3 35.6 100 B‐4 J‐2 0 0 0 15.7 1.2 12.6 29.5 25.8 44.7 70.5 100 29.5 25.8 44.7 100

J‐3 0 3.8 3.8 24 1 4.8 29.8 19.7 46.7 66.4 100 31.0 20.5 48.5 100 B‐5 J‐2 0 3.5 3.5 1.8 14.7 33.8 50.3 22.9 23.3 46.2 100 52.1 23.7 24.1 100

J‐3 0 0 0 0 34.7 38.6 73.3 7.4 19.3 26.7 100 73.3 7.4 19.3 100 B‐6 J‐2 0 5.4 5.4 17.7 8.5 12.6 38.8 21.5 34.3 55.8 100 41.0 22.7 36.3 100 B‐7 J‐2 0 14.2 14.2 6.1 25.7 30 61.8 16.8 7.2 24 100 72.0 19.6 8.4 100

J‐3 0 10.4 10.4 17.1 23.5 25.6 66.2 13.7 9.7 23.4 100 73.9 15.3 10.8 100

Calculations for USDA Triangle Classification