Appendix A

Water Quality – Town of Greenwich

Town of Greenwich Drainage Manual February 2012

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Impaired Water Bodies – Town of Greenwich

Water Body Impaired Segment Location Cause Potential Source Segment Designated Use Size From mouth at Greenwich Harbor (just downstream [DS] of I95 crossing, at exit Habitat for Fish, Horseneck 5.78 3 offramp), US to Putnam Lake Other Aquatic Cause Unknown Source Unknown Brook-01 Miles Reservoir outlet dam (just upstream [US] Life and Wildlife of Dewart Road crossing) From head of tide (US of Route 1 Habitat for Fish, Sources Outside State Jurisdiction or Borders, Source crossing, at INLET to ponded portion of Other Aquatic Cause Unknown Unknown, Highway/Road/Bridge Runoff (Non- Byram River- river, just DS of Upland Street East 0.49 Life and Wildlife construction Related) 01 area), US to Pemberwick outlet dam (US Miles Illicit Connections/Hook-ups to Storm Sewers, Source of Comly Avenue crossing, and US of Recreation Escherichia coli Unknown confluence with Pemberwick Brook Putnam Lake Habitat for Fish, Impoundment of Horseneck Brook, just 95.56 Alterations in wetland Reservoir Other Aquatic Habitat Modification - other than Hydromodification south of Rt. 15 Acres habitats (Greenwich) Life and Wildlife Western portion of LIS, Inner Estuary, Dissolved oxygen LIS WB Inner - upper Indian Harbor (lower portion of Habitat for 0.025 saturation; Nutrient/ Residential Districts, Municipal Point Source Indian Harbor Greenwich Creek) from Davis Avenue Marine Fish, Square Eutrophication Discharges, Non-Point Source, Unspecified Urban (upper), crossing, US to saltwater limit at West Other Aquatic Miles Biological Indicators; Stormwater Greenwich Brother Drive crossing (includes I95 Life and Wildlife Oxygen, Dissolved crossing). Dissolved oxygen Habitat for saturation; Unspecified Urban Stormwater, Non-Point Source, Western portion of LIS, Inner Estuary, Marine Fish, LIS WB Inner - Nutrient/Eutrophication Residential Districts, Municipal Point Source from SA/SB water quality line at mouth 0.104 Other Aquatic Greenwich Biological Indicators; Discharges, Residential Districts of Greenwich Harbor (Round Island to Square Life and Wildlife Harbor, Oxygen, Dissolved Smith Cove), US to saltwater limit just Miles Greenwich Commercial Marina/Boating Sanitary On-vessel Discharges, below I95 (mouth of Horseneck Brook). Harvesting where Fecal Coliform Residential Districts, Waterfowl, Non-Point Source, Authorized Unspecified Urban Stormwater Sources Outside State Jurisdiction or Borders, Residential Districts, Sanitary Sewer Overflows (Collection System Failures), Non-Point Source, Recreation Enterococcus Western portion of LIS, Inner Estuary, Waterfowl, Unspecified Urban Stormwater, LIS WB Inner - from SA/SB water quality line at mouth Marina/Boating Sanitary On-vessel Discharges, Illicit 0.037 Byram River of Byram River, US to saltwater limit just Connections/Hook-ups to Storm Sewers Square (CT), above Route 1 crossing, out to CT/NY Sources Outside State Jurisdiction or Borders, Miles Greenwich border (includes CT half of River), I95 Commercial Residential Districts, Sanitary Sewer Overflows crosses river in segment Shellfishing (Collection System Failures), Non-Point Source, Fecal Coliform Harvesting where Waterfowl, Unspecified Urban Stormwater, Authorized Marina/Boating Sanitary On-vessel Discharges, Illicit Connections/Hook-ups to Storm Sewers

Town of Greenwich Drainage Manual A-1 February 2012 Impaired Water Bodies – Town of Greenwich

Water Body Impaired Segment Location Cause Potential Source Segment Designated Use Size Shellfish Western portion of LIS from Greenwich LIS WB Shore Harvesting for Point to Peck Point (includes Greenwich 0.54 Non-Point Source, Waterfowl, Residential Districts, - Stamford Direct Point Beach, western potion of Stamford Square Fecal Coliform Unspecified Urban Stormwater, Marina/Boating Harbor (West), Consumption Harbor) out approximately 1000 ft Miles Sanitary On-vessel Discharges Greenwich Where offshore. Authorized Shellfish Western portion of LIS from Todd Point LIS WB Shore Harvesting for to Greenwich Point (includes Elias Point, 1.244 Waterfowl, Non-Point Source, Residential Districts, - Greenwich Direct Greenwich Island, Pelican Island, Flat Square Fecal Coliform Marina/Boating Sanitary On-vessel Discharges, Cove, Consumption Neck Point, Greenwich Cove) out Miles Unspecified Urban Stormwater Greenwich Where approximately 1000 ft offshore Authorized Shellfish Non-Point Source, Marina/Boating Sanitary On-vessel LIS WB Shore Western portion of LIS from Tweed Harvesting for 0.704 Discharges, On-site Treatment Systems (Septic - Cos Cob Island to Todd Point (includes Horse Direct Square Fecal Coliform Systems and Similar Decentralized Systems), Harbor, Island, , Cos Cob Cove) out Consumption Miles Waterfowl, Unspecified Urban Stormwater, Residential Greenwich approximately 1000 ft offshore. Where Districts Authorized Dissolved oxygen Habitat for saturation; Unspecified Urban Stormwater, Non-Point Source, Marine Fish, Nutrient/Eutrophication Residential Districts, Municipal Point Source Other Aquatic Western portion of LIS from Field Point Biological Indicators; Discharges, Residential Districts LIS WB Shore Life and Wildlife to Tweed Island (includes Round Island, 0.374 Oxygen, Dissolved - Smith Cove, Tweed Island, Smith Cove, Indian Square Shellfish Indian Harbor, Harbor) out approximately 1000 ft Miles Harvesting for Greenwich Marina/Boating Sanitary On-vessel Discharges, offshore. Direct Fecal Coliform Unspecified Urban Stormwater, Residential Districts, Consumption Waterfowl, Non-Point Source Where Authorized Highway/Road/Bridge Runoff (Non-construction Western portion of LIS from just west of Related), Sources Outside State Jurisdiction or LIS WB Shore Shore Island to Field Point (includes 0.34 Borders, Non-Point Source, Waterfowl, Illicit - Byram Shore Island, Rich Island, Farwells Square Recreation Enterococcus Connections/Hook-ups to Storm Sewers, Sanitary Harbor, Island, Game Cock Island, Byram Miles Sewer Overflows (Collection System Failures), Greenwich Harbor) out approximately 1000 ft Residential Districts, Unspecified Urban Stormwater, offshore. Marina/Boating Sanitary On-vessel Discharges

A-2 Town of Greenwich Drainage Manual February 2012 Impaired Water Bodies – Town of Greenwich

Water Body Impaired Segment Location Cause Potential Source Segment Designated Use Size Waterfowl, Illicit Connections/Hook-ups to Storm Shellfish Sewers, Residential Districts, Marina/Boating Sanitary Harvesting for On-vessel Discharges, Sanitary Sewer Overflows Direct Fecal Coliform (Collection System Failures), Sources Outside State Consumption Jurisdiction or Borders, Highway/Road/Bridge Runoff Where (Non-construction Related), Unspecified Urban Authorized Stormwater, Non-Point Source Sanitary Sewer Overflows (Collection System Shellfish Failures), Sources Outside State Jurisdiction or Western portion of LIS from NY/CT LIS WB Shore Harvesting for Borders, Residential Districts, Unspecified Urban border at Byram River to just west of 0.244 - Byram Direct Stormwater, Non-Point Source, Marina/Boating Shore Island (includes mouth of Byram Square Fecal Coliform Harbor (West), Consumption Sanitary On-vessel Discharges, Waterfowl, Illicit River, Byram Point) out approximately Miles Greenwich Where Connections/Hook-ups to Storm Sewers, 1000 ft offshore Authorized Highway/Road/Bridge Runoff (Non-construction Related) Dissolved oxygen Habitat for saturation; Non-Point Source, Residential Districts, Unspecified Marine Fish, Nutrient/Eutrophication Urban Stormwater, Atmospheric Deposition - Nitrogen, LIS WB Other Aquatic Biological Indicators; Industrial Point Source Discharge, Municipal Point Midshore - Western portion of LIS from Life and Wildlife Oxygen, Dissolved; Source Discharges 2.101 Outer approximately 1000 ft offshore Total Nitrogen Square Stamford (Greenwich Point to Point Shellfish Miles Harbor, area), out to 50 ft contour. Harvesting for Marina/Boating Sanitary On-vessel Discharges, Greenwich Direct Fecal Coliform Residential Districts, Waterfowl, Unspecified Urban Consumption Stormwater, Non-Point Source Where Authorized Dissolved oxygen Habitat for saturation; Non-Point Source, Residential Districts, Atmospheric Marine Fish, Nutrient/Eutrophication Deposition - Nitrogen, Unspecified Urban Stormwater, Other Aquatic Biological Indicators; Industrial Point Source Discharge, Municipal Point LIS WB Western portion of LIS from Life and Wildlife Oxygen, Dissolved; Source Discharges Midshore - 2.378 approximately 1000 ft offshore (Bush Total Nitrogen Outer Cos Cob Square Island to Greenwich Point area), out to Shellfish Harbor, Miles 50 ft contour Harvesting for Greenwich Unspecified Urban Stormwater, Marina/Boating Direct Fecal Coliform Sanitary On-vessel Discharges, Non-Point Source, Consumption Residential Districts, Waterfowl Where Authorized

Town of Greenwich Drainage Manual A-3 February 2012 Impaired Water Bodies – Town of Greenwich

Water Body Impaired Segment Location Cause Potential Source Segment Designated Use Size Dissolved oxygen LIS WB Residential Districts, Industrial Point Source Discharge, Western portion of LIS from Habitat for saturation; Oxygen, Midshore - 2.007 Non-Point Source, Municipal Point Source Discharges, New York state line just beyond Great Marine Fish, Dissolved; Total Outer Captain Square Unspecified Urban Stormwater, Illicit Captain Island to east of Wee Captain Other Aquatic Nitrogen, Organic Harbor, Miles Connections/Hook-ups to Storm Sewers, Atmospheric Island, out to 50 ft contour. Life and Wildlife Enrichment (Sewage) Greenwich Deposition - Nitrogen Biological Indicators Unspecified Urban Stormwater, Sources Outside State Dissolved oxygen Jurisdiction or Borders, Atmospheric Deposition - Habitat for saturation, Nitrogen Nitrogen, Residential Districts, Non-Point Source, Illicit Marine Fish, (Total), Connections/Hook-ups to Storm Sewers, Wet Weather Other Aquatic Nutrient/Eutrophication Discharges (Point Source and Combination of Western portion of LIS from Life and Wildlife Biological Indicators, LIS WB Stormwater, SSO or CSO), Industrial Point Source approximately 1000 ft offshore (Bryant Oxygen, Dissolved Midshore - 3.422 Discharge, Municipal Point Source Discharges Point at Connecticut/New York state line, Captain Square Industrial Point Source Discharge, Unspecified Urban to Brush Island, Captain Harbor area), Harbor, Miles Shellfish Stormwater, Illicit Connections/Hook-ups to Storm out to just beyond Greenwich Harvesting for Sewers, Marina/Boating Sanitary On-vessel to Wee Captain Island. Direct Discharges, Municipal Point Source Discharges, Fecal Coliform Consumption Residential Districts, Waterfowl, Non-Point Source, Where Wet Weather Discharges (Point Source and Authorized Combination of Stormwater, SSO or CSO), Sources Outside State Jurisdiction or Borders Dissolved oxygen Unspecified Urban Stormwater, Industrial Point Source Habitat for saturation, Nitrogen LIS WB 11.753 Discharge, Combined Sewer Overflows, Municipal Western portion of LIS from 50ft contour Marine Fish, (Total), Offshore - Square Point Source Discharges, Non-Point Source, to CT/NY State line. Other Aquatic Nutrient/Eutrophication Greenwich Miles Atmospheric Deposition - Nitrogen, Residential Life and Wildlife Biological Indicators, Districts Oxygen, Dissolved Source: 2010 State of Connecticut Integrated Water Quality Report (Final - May 31, 2011)

A-4 Town of Greenwich Drainage Manual February 2012 Figure A-1. Impaired Water Bodies

Town of Greenwich Drainage Manual A-5 February 2012