2018 Water Quality Management Program Division ofEnvironmental Protection DepartmentPlanning of & Natural Resources USVI Integrated WaterUSVI Integrated Quality Monitoring & Assessment Report The 2018 USVI Integrated Water Quality Monitoring & Assessment Report intends to satisfy the USVI requirements of the Federal Clean Water Act Sections 305(b) and 303(d). Submitted by: Department of Planning & Natural Resources Division of Environmental Protection St. Croix (340) 773-1082 St. Thomas (340) 774-3320 Web: http://dpnr.vi.gov/ 2018 USVI Integrated Report Page 1 of 319 Table of Contents I. EXECUTIVE SUMMARY ....................................................................................................... 5 A. Purpose ..................................................................................................................................... 5 B. Overview of Water Quality Conditions and Trends................................................................. 5 C. Program Initiatives ................................................................................................................... 6 D. Summary of Designated Uses .................................................................................................. 7 E. Highlights of the Rest of this Report ........................................................................................ 8 II. BACKGROUND ....................................................................................................................... 9 A. Resource Overview .................................................................................................................. 9 B. Classifications, Total Waters and Applicable Standards ....................................................... 23 C. Water Pollution Control Program .......................................................................................... 40 D. Non-Point Source Program .................................................................................................... 48 E. Solid Waste Program ................................................................................................................ 77 F. Oil and Hazardous Materials .................................................................................................... 77 G. Wetlands Programs .............................................................................................................. 105 H. Water Quality Management Program ..................................................................................... 117 III. SURFACE WATER MONITORING & ASSESSMENT ..................................................... 118 A. Surface Water Monitoring Program ........................................................................................... 118 B. Assessment Methodology .......................................................................................................... 128 C. Monitoring Strategy ................................................................................................................... 196 D. Estuary and Coastal Assessment ................................................................................................ 203 E. Wetlands Assessment ................................................................................................................. 219 F. Public Health/Aquatic Life Concerns ......................................................................................... 223 IV. GROUNDWATER ASSESSMENT ...................................................................................... 224 A. Virgin Islands Water and Power Authority (WAPA) ................................................................ 224 B. Wellhead Protection Actualization Assessment ......................................................................... 226 C. WAPA wells ............................................................................................................................... 229 VII. REFERENCES ............................................................................................................................ 256 Appendix 1: 2018 303(d) List Narrative ............................................................................................. 258 Appendix 2: 2018 303(d) List of Impaired Waters ............................................................................. 296 Appendix 3: 2018 Responsiveness Summary for US Virgin Islands Assessment Methodology ....... 307 Appendix 4: 2018 Responsiveness Summary for US Virgin Islands 303(d) List of Impaired Waters ............................................................................................................................................................. 315 2018 USVI Integrated Report Page 2 of 319 List of Tables Table II.A.1 Characteristics of Virgin Islands Watersheds and Islands ............................................... 10 Table II A.2 Sub-watersheds Listed in the Unified Watershed Assessment (UWA) ........................... 11 Table II.A.3 Alignment of 14-Digit HUCs and Watersheds ................................................................ 13 Table II.A.4 Assessment Units, Square Miles and Monitoring Sites ................................................... 15 Table II.C.1.a US Virgin Islands NEW TPDES Permits, FY2016 and 2017 (Issue Date between October 1, 2015 and September 30, 3017). .......................................................................................... 42 Table II.C.1.b US Virgin Islands TPDES Permits REISSUANCE, FY2016 and 2017 (Issue Date between October 1, 2015 and September 30, 3017). ............................................................................ 43 Table II.C.2 Summary of TPDES Activities, FY2016 - 2017 .............................................................. 44 Table II.C.3 Supplementary POTW Inspections: TPDES Activities, FY2016 - 2017 ......................... 45 Table II.C.4 Summary of TPDES Enforcement Activities, FY 2016 - 2017 ....................................... 45 Table II.D.1 TMDLs Established for the USVI due Primarily to Non-Point Sources. ........................ 49 Figure II.F.1.a. LUST BACKLOG FY 2018 ........................................................................................ 78 Table II.F.1.a LUST Clean Up Sites ..................................................................................................... 78 Table II.F.1.b: List of Active UST Systems ......................................................................................... 80 Table II.F.1.b: Status of LUST sites ..................................................................................................... 84 TABLE II.F.2.a: List of Terminal Facilities ......................................................................................... 87 Figure II.F.3.a STX USED OIL FACILITIES ..................................................................................... 93 Figure II.F.3.b Percentage of Used Oil Facilities STX ......................................................................... 94 Figure II.F.3.c Percentage of Used Oil Facilities STT/STJ .................................................................. 95 Table II.F.3.a List of Used Oil Permit Holders – St. Thomas-St. John District ................................... 95 Table II.F.3.b List of Used Oil Permit Holders – St. Croix District ..................................................... 98 Table II.F.4.a List of Hazardous Waste Permits in USVI .................................................................. 102 Table II.F.5.a List of Brownfields Sites in USVI ............................................................................... 104 Table III.A.1. Virgin Islands Ambient Monitoring Sites. .................................................................. 119 Table III.A.2. Virgin Islands Ambient Monitoring Frequency. ......................................................... 122 Table III.C.1. Waterbodies, Segments, and Categories ...................................................................... 203 Table III.D.1 Wetlands Classification12 ............................................................................................ 220 Table IV.A.3 Overview of VI Public Water Systems Utilizing Groundwater ................................... 225 Table IV.B.1 Non-Permitted uses in Zone 1 ...................................................................................... 226 Table IV.C.1 Primary WAPA Wells ................................................................................................... 229 Table IV.C.2 WAPA Wells not intended for service after 2010 ....................................................... 230 Table IV.C.3 WAPA Well Fields not intended for service after 2010 ............................................... 231 Table IV.C.4. Wells Selected By Daily Appropriation ..................................................................... 245 Table IV.C.5. Wells selected by risk to populace .............................................................................. 250 2018 USVI Integrated Report Page 3 of 319 List of Figures Figure II.A.1 St. Croix subwatersheds and assessment units (AU) overview ...................................... 10 Figure II.A.2 St. Thomas/St. John subwatersheds and assessment units (AU) overview .................... 11 Figure 1. Class A - Buck Island, St. Croix........................................................................................... 24 Figure 2. Class A - Trunk Bay,