appendix k water quality - pvd€¦ · 180.600 43 woods/grass comb., fair, hsg a 8.500 76...

T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation

Appendix K

Water Quality

T.F. Green Airport Warwick, Rhode Island

Prepared for Federal Aviation Administration

Prepared by

July 2011


This Page Intentionally Left Blank


T.F. Green Airport Improvement Program FEIS Appendix

Appendix K, Water Quality, of this Final Environmental Impact Statement (FEIS) provides updated and new technical information since the publication of the Draft Environmental Impact Statement (DEIS) in July 2010. The DEIS, provided on the enclosed DVD, contained a corresponding technical report, Water Quality Technical Report, describing significant technical information pertaining to the water quality analysis. It is intended that this FEIS appendix provide an update to the DEIS technical report. Reviewers should consult both the DEIS and FEIS for full documentation.

Table of Contents

K.1 HydroCAD Calculations ......................................................................... K-1

K.2 Pond Sizing Analysis .......................................................................... K-15

K.3 Water Quality Monitoring Data ............................................................. K-21

Appendix K – Water Quality K-i July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc

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Appendix K – Water Quality K-ii July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc


K.1 HydroCAD Calculations

The following sections provide the results of the HydroCAD Calculations for the 2004 Baseline Condition and the proposed T.F. Green Airport Improvement Program Preferred Alternative (Alternative B4).

Appendix K – Water Quality K-1 July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc

EX1BBN DP1

Buckeye Brook North To Buckeye Brook North

EX2WP DP2

Warwick Pond To Warwick Pond

EX3BBS DP3

Buckeye Brook South To Buckeye Brook South

EX4TB DP4

Tuscatucket Brook To Tuscatucket Brook

EX5CB DP5

Callahan Brook To Callahan Brook

Drainage Diagram for 0922806 Existing ConditionsSubcat Reach Pond Link Prepared by Vanasse Hangen Brustlin, Inc., Printed 2/2/2011

HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC

K-3

0922806 Existing Conditions Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 2

Time span=5.0020.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR20 method, UH=SCS

Reach routing by StorInd+Trans method Pond routing by StorInd method

Subcatchment EX1BBN: Buckeye Brook Runoff Area=598.000 ac 39.98% Impervious Runoff Depth>4.21" Flow Length=8,175' Tc=47.8 min CN=66 Runoff=1,436.88 cfs 209.596 af

Subcatchment EX2WP: Warwick Pond Runoff Area=23.900 ac 48.95% Impervious Runoff Depth>4.48" Flow Length=1,213' Tc=23.8 min CN=68 Runoff=84.51 cfs 8.916 af

Subcatchment EX3BBS: Buckeye Brook Runoff Area=458.500 ac 33.13% Impervious Runoff Depth>3.75" Flow Length=4,962' Tc=44.1 min CN=62 Runoff=1,025.46 cfs 143.269 af

Subcatchment EX4TB: Tuscatucket Runoff Area=145.600 ac 24.04% Impervious Runoff Depth>2.73" Flow Length=2,031' Tc=44.7 min CN=53 Runoff=230.28 cfs 33.143 af

Subcatchment EX5CB: Callahan Brook Runoff Area=132.900 ac 19.49% Impervious Runoff Depth>2.87" Flow Length=1,566' Tc=26.6 min CN=54 Runoff=281.90 cfs 31.738 af

Link DP1: To Buckeye Brook North Inflow=1,436.88 cfs 209.596 af Primary=1,436.88 cfs 209.596 af

Link DP2: To Warwick Pond Inflow=84.51 cfs 8.916 af Primary=84.51 cfs 8.916 af

Link DP3: To Buckeye Brook South Inflow=1,025.46 cfs 143.269 af Primary=1,025.46 cfs 143.269 af

Link DP4: To Tuscatucket Brook Inflow=230.28 cfs 33.143 af Primary=230.28 cfs 33.143 af

Link DP5: To Callahan Brook Inflow=281.90 cfs 31.738 af Primary=281.90 cfs 31.738 af

Total Runoff Area = 1,358.900 ac Runoff Volume = 426.662 af Average Runoff Depth = 3.77" 65.88% Pervious = 895.300 ac 34.12% Impervious = 463.600 ac

K-4

http:Primary=281.90http:Inflow=281.90http:Primary=230.28http:Inflow=230.28http:Primary=1,025.46http:Inflow=1,025.46http:Primary=84.51http:Inflow=84.51http:Primary=1,436.88http:Inflow=1,436.88http:Runoff=281.90http:Depth>2.87http:Runoff=230.28http:Depth>2.73http:Runoff=1,025.46http:Depth>3.75http:Runoff=84.51http:Depth>4.48http:Runoff=1,436.88http:Depth>4.21http:span=5.00�20.00http:Rainfall=8.70


Summary for Subcatchment EX1BBN: Buckeye Brook North

Runoff = 1,436.88 cfs @ 12.67 hrs, Volume= 209.596 af, Depth> 4.21"

Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"

Area (ac) CN Description 239.100 98 Paved parking, HSG A 180.600 43 Woods/grass comb., Fair, HSG A

8.500 76 Woods/grass comb., Fair, HSG C 11.500 82 Woods/grass comb., Fair, HSG D

158.300 43 Woods/grass comb., Fair, HSG A 598.000 66 Weighted Average 358.900 60.02% Pervious Area 239.100 39.98% Impervious Area

Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs)

9.6 50 0.0050 0.09 Sheet Flow,

Grass: Short n= 0.150 P2= 3.30"

1.5 194 0.0110 2.13 Shallow Concentrated Flow,

Paved Kv= 20.3 fps

36.7 7,931 0.0025 3.60 11.31 Pipe Channel,

24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections

47.8 8,175 Total

Summary for Subcatchment EX2WP: Warwick Pond

Runoff = 84.51 cfs @ 12.33 hrs, Volume= 8.916 af, Depth> 4.48"


Area (ac) CN Description 11.700 98 Paved parking, HSG A

0.400 39 >75% Grass cover, Good, HSG A * 11.800 39 >75% Grass cover, Good, HSG A (assumed)

23.900 68 Weighted Average 12.200 51.05% Pervious Area 11.700 48.95% Impervious Area

K-5

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Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 Sheet Flow,

Grass: Short n= 0.150 P2= 3.30" 0.3 50 0.0340 2.97 Shallow Concentrated Flow,

Unpaved Kv= 16.1 fps 2.9 1,063 0.0070 6.02 18.93 Pipe Channel,


23.8 1,213 Total

Summary for Subcatchment EX3BBS: Buckeye Brook South



Area (ac) CN Description 151.900 98 Paved parking, HSG A

47.000 39 >75% Grass cover, Good, HSG A 9.200 61 >75% Grass cover, Good, HSG B

35.800 74 >75% Grass cover, Good, HSG C 5.400 80 >75% Grass cover, Good, HSG D

209.200 39 >75% Grass cover, Good, HSG A 458.500 62 Weighted Average 306.600 66.87% Pervious Area 151.900 33.13% Impervious Area


Grass: Short n= 0.150 P2= 3.30" 15.7 1,126 0.0055 1.19 Shallow Concentrated Flow,



44.1 4,962 Total

Summary for Subcatchment EX4TB: Tuscatucket Brook



K-6



Area (ac) CN Description 35.000 98 Paved parking, HSG A 29.300 39 >75% Grass cover, Good, HSG A 81.300 39 >75% Grass cover, Good, HSG A

145.600 53 Weighted Average 110.600 75.96% Pervious Area

35.000 24.04% Impervious Area



Unpaved Kv= 16.1 fps 1.2 433 0.0067 5.89 18.52 Pipe Channel,


44.7 2,031 Total

Summary for Subcatchment EX5CB: Callahan Brook



Area (ac) CN Description 25.900 98 Paved parking, HSG A 91.100 43 Woods/grass comb., Fair, HSG A

0.800 65 Woods/grass comb., Fair, HSG B 15.100 43 Woods/grass comb., Fair, HSG A

132.900 54 Weighted Average 107.000 80.51% Pervious Area

25.900 19.49% Impervious Area



Paved Kv= 20.3 fps 3.2 881 0.0040 4.55 14.31 Pipe Channel,


26.6 1,566 Total

K-7

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Summary for Link DP1: To Buckeye Brook North

Inflow Area = 598.000 ac, 39.98% Impervious, Inflow Depth > 4.21" for 100 Year event Inflow = 1,436.88 cfs @ 12.67 hrs, Volume= 209.596 af Primary = 1,436.88 cfs @ 12.67 hrs, Volume= 209.596 af, Atten= 0%, Lag= 0.0 min

Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs

Summary for Link DP2: To Warwick Pond

Inflow Area = 23.900 ac, 48.95% Impervious, Inflow Depth > 4.48" for 100 Year event Inflow = 84.51 cfs @ 12.33 hrs, Volume= 8.916 af Primary = 84.51 cfs @ 12.33 hrs, Volume= 8.916 af, Atten= 0%, Lag= 0.0 min


Summary for Link DP3: To Buckeye Brook South



Summary for Link DP4: To Tuscatucket Brook



Summary for Link DP5: To Callahan Brook



K-8

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1BBN

Buckeye Brook North

3BBS

Buckeye Brook South

4TB

Tuscatucket Brook

5CB

Callahan Brook

DP1

To Buckeye Brook North

2WP

Warwick Pond

DP2

To Warwick Pond

DP3

To Buckeye Brook

South

DP4

To Tuscatucket Brook

DP5

To Callahan Brook

Drainage Diagram for 0922806 Proposed Conditions ALT B4Subcat Reach Pond Link Prepared by Vanasse Hangen Brustlin, Inc., Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC

K-9

0922806 Proposed Conditions ALT B4 Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 2

Time span=5.0020.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR20 method, UH=SCS

Reach routing by StorInd+Trans method Pond routing by StorInd method

Subcatchment 1BBN: Buckeye Brook Runoff Area=597.900 ac 43.30% Impervious Runoff Depth>4.44" Flow Length=8,175' Tc=47.8 min CN=68 Runoff=1,514.28 cfs 221.151 af

Subcatchment 2WP: Warwick Pond Runoff Area=27.200 ac 47.43% Impervious Runoff Depth>4.36" Flow Length=1,213' Tc=23.8 min CN=67 Runoff=93.73 cfs 9.882 af

Subcatchment 3BBS: Buckeye Brook Runoff Area=458.200 ac 42.89% Impervious Runoff Depth>4.44" Flow Length=4,962' Tc=44.1 min CN=68 Runoff=1,214.47 cfs 169.708 af

Subcatchment 4TB: Tuscatucket Brook Runoff Area=160.500 ac 30.90% Impervious Runoff Depth>3.18" Flow Length=2,031' Tc=44.7 min CN=57 Runoff=299.58 cfs 42.520 af

Subcatchment 5CB: Callahan Brook Runoff Area=115.600 ac 18.94% Impervious Runoff Depth>2.87" Flow Length=1,566' Tc=26.6 min CN=54 Runoff=245.21 cfs 27.607 af

Link DP1: To Buckeye Brook North Inflow=1,514.28 cfs 221.151 af Primary=1,514.28 cfs 221.151 af

Link DP2: To Warwick Pond Inflow=93.73 cfs 9.882 af Primary=93.73 cfs 9.882 af

Link DP3: To Buckeye Brook South Inflow=1,214.47 cfs 169.708 af Primary=1,214.47 cfs 169.708 af

Link DP4: To Tuscatucket Brook Inflow=299.58 cfs 42.520 af Primary=299.58 cfs 42.520 af

Link DP5: To Callahan Brook Inflow=245.21 cfs 27.607 af Primary=245.21 cfs 27.607 af

Total Runoff Area = 1,359.400 ac Runoff Volume = 470.869 af Average Runoff Depth = 4.16" 60.29% Pervious = 819.600 ac 39.71% Impervious = 539.800 ac

K-10

http:Primary=245.21http:Inflow=245.21http:Primary=299.58http:Inflow=299.58http:Primary=1,214.47http:Inflow=1,214.47http:Primary=93.73http:Inflow=93.73http:Primary=1,514.28http:Inflow=1,514.28http:Runoff=245.21http:Depth>2.87http:Runoff=299.58http:Depth>3.18http:Runoff=1,214.47http:Depth>4.44http:Runoff=93.73http:Depth>4.36http:Runoff=1,514.28http:Depth>4.44http:span=5.00�20.00http:Rainfall=8.70


Summary for Subcatchment 1BBN: Buckeye Brook North



Area (ac) CN Description 258.900 98 Paved parking, HSG A 182.200 43 Woods/grass comb., Fair, HSG A 8.500 76 Woods/grass comb., Fair, HSG C 11.500 82 Woods/grass comb., Fair, HSG D 136.800 43 Woods/grass comb., Fair, HSG A 597.900 68 Weighted Average 339.000 56.70% Pervious Area 258.900 43.30% Impervious Area



Paved Kv= 20.3 fps 36.7 7,931 0.0025 3.60 11.31 Pipe Channel,


47.8 8,175 Total

Summary for Subcatchment 2WP: Warwick Pond



Area (ac) CN Description 12.900 98 Paved parking, HSG A 0.400 39 >75% Grass cover, Good, HSG A

* 13.900 39 >75% Grass cover, Good, HSG A (assumed) 27.200 67 Weighted Average 14.300 52.57% Pervious Area 12.900 47.43% Impervious Area

K-11







23.8 1,213 Total

Summary for Subcatchment 3BBS: Buckeye Brook South



Area (ac) CN Description 196.500 98 Paved parking, HSG A 41.900 39 >75% Grass cover, Good, HSG A 8.500 61 >75% Grass cover, Good, HSG B 33.900 74 >75% Grass cover, Good, HSG C 5.400 80 >75% Grass cover, Good, HSG D

172.000 39 >75% Grass cover, Good, HSG A 458.200 68 Weighted Average 261.700 57.11% Pervious Area 196.500 42.89% Impervious Area





44.1 4,962 Total

Summary for Subcatchment 4TB: Tuscatucket Brook



K-12



Area (ac) CN Description 49.600 98 Paved parking, HSG A 34.600 39 >75% Grass cover, Good, HSG A 0.100 61 >75% Grass cover, Good, HSG B

* 76.200 39 >75% Grass cover, Good, HSG A (assumed) 160.500 57 Weighted Average 110.900 69.10% Pervious Area 49.600 30.90% Impervious Area



Unpaved Kv= 16.1 fps 1.2 433 0.0067 5.89 18.52 Pipe Channel,


44.7 2,031 Total

Summary for Subcatchment 5CB: Callahan Brook



Area (ac) CN Description 21.900 98 Paved parking, HSG A 88.200 43 Woods/grass comb., Fair, HSG A 0.800 65 Woods/grass comb., Fair, HSG B 4.700 43 Woods/grass comb., Fair, HSG A

115.600 54 Weighted Average 93.700 81.06% Pervious Area 21.900 18.94% Impervious Area



Paved Kv= 20.3 fps 3.2 881 0.0040 4.55 14.31 Pipe Channel,


26.6 1,566 Total

K-13

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Summary for Link DP1: To Buckeye Brook North



Summary for Link DP2: To Warwick Pond



Summary for Link DP3: To Buckeye Brook South



Summary for Link DP4: To Tuscatucket Brook



Summary for Link DP5: To Callahan Brook



K-14

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K.2 Pond Sizing Analysis

The following graphs provide the pond sizing analysis for the Preferred Alternative (Alternative B4). Included are the Buckeye Brook North drainage area, the Buckeye Brook South drainage area, the Warwick Pond drainage area, and the Tuscatucket Brook drainage area.



Buckeye Brook North Drainage Area - Pond Sizing

Source: HydroCAD TR-20 Pond Sizing Analysis



Buckeye Brook South Drainage Area – Pond Sizing




Warwick Pond Drainage Area – Pond Sizing




Tuscatucket Brook Drainage Area – Pond Sizing




K.3 Water Quality Monitoring Data

The following tables provide water quality monitoring data for Outfalls 10A and 11A/12A from 2006 to 2010. According to RIAC, data from 2004 and 2005 are not available for these outfalls. Dissolved oxygen (DO) is also not available during this time period.



Table K.3-1 Water Quality at T.F. Green Airport Outfall 10A1,2,3

Oil & Propylene TSS2 BOD2 COD2 Grease glycol Iron

Date1 (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) VOCs (µg/L) (mg/L) 9/14/2006 59


Table K.3-2 Water Quality at T.F. Green Airport Outfall 11A/12A1,2,3

Oil & Propylene TSS2 BOD2 COD2 Grease glycol Iron

Date1 (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) VOCs (µg/L) (mg/L) 9/14/2006




Appendix K: Water QualityTable of ContentsK.1 HydroCAD CalculationsK.2 Pond Sizing AnalysisK.3 Water Quality Monitoring Data

appendix k water quality - pvd€¦ · 180.600 43 woods/grass comb., fair, hsg a 8.500 76...

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