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FINAL Commonwealth of the Northern Mariana Islands Integrated 305(B) and 303(D) Water Quality Assessment Report

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FINAL Commonwealth of the Northern Mariana Islands Integrated 305(B) and 303(D) Water Quality Assessment Report FINAL Commonwealth of the Northern Mariana Islands Integrated 305(b) and 303(d) Water Quality Assessment Report Chalan Piao Beach, Saipan Division of Environmental Quality August 2012 Authors: Clarissa T. Bearden, Derek Chambers, Ryan Okano Maps by Yubert Alepuyo & Ken Cochrane <This page left intentionally blank> FINAL Commonwealth of the Northern Mariana Islands Integrated 305(b) and 303(d) Water Quality Assessment Report Division of Environmental Quality August, 2012 Authors: Clarissa T. Bearden, Derek Chambers, Ryan Okano Maps by Yubert Alepuyo & Ken Cochrane <This page left intentionally blank> Table of Contents ACKNOWLEDGEMENTS............................................................................................................ 1 A. EXECUTIVE SUMMARY .................................................................................................... 3 B. BACKGROUND .................................................................................................................... 5 B.1. Scope of Waters in the Integrated Report ........................................................................ 5 B.2. Water Pollution Control Program .................................................................................. 10 B.2.1. DEQ Wastewater and Erosion Control Program .................................................... 10 B.2.2. DEQ Nonpoint Source Pollution Control Program ................................................ 11 B3. Special State Concerns and Recommendations ............................................................. 12 C. SURFACE WATER MONITORING AND ASSESSMENT .............................................. 13 C1. Monitoring Program....................................................................................................... 13 C1.1 Surface Water Quality Monitoring Programs........................................................ 13 C1.2 Biological Monitoring Program............................................................................. 14 C1.3 Other Data Used..................................................................................................... 16 C2. Assessment Methodology .............................................................................................. 19 C2.1 Designated Uses and CNMI Water Quality Standards .......................................... 19 C2.2 Water Body Segmentation - Watershed Approach................................................ 22 C2.3 USEPA’s CALM Assessment Categories ............................................................. 22 C2.4 Assessment Criteria – Coastal Waters .................................................................... 25 C2.5 Assessment Criteria – Fresh Surface waters (Streams and Lakes/Ponds) .............. 27 C3. Assessment Results ........................................................................................................ 29 C3.1 TMDL Development Status................................................................................... 29 C3.2 Removal of Waters from the 303(d) List............................................................... 30 C3.3 Coastal Water Quality............................................................................................ 32 C3.4 Rivers/Streams Water Quality ............................................................................... 37 C3.5 Lake/pond Water Quality....................................................................................... 37 C4. Wetlands Program.......................................................................................................... 38 C5. Public Health Issues ....................................................................................................... 41 C5.1 Beach Water Quality Issues................................................................................... 41 C5.2 Public Water Supply/Drinking Water Use Reporting............................................ 42 D. GROUND WATER MONITORING AND ASSESSMENT ............................................... 44 D.1 Overview of Ground Water Contamination Sources ..................................................... 44 D.2 Overview of State Ground Water Protection Programs................................................. 46 D.2.1 Well Drilling and Well Operation Regulations ...................................................... 46 D.2.2 Wastewater Disposal Regulations........................................................................... 47 D.2.3 Underground Storage Tank Regulations................................................................. 47 D.2.4 Underground Injection Control Regulations........................................................... 47 D.2.5 Safe Drinking Water Regulations ........................................................................... 47 D.2.6 Other Monitoring Events/Programs........................................................................ 48 D.3 Summary of Ground Water Contamination Sources (all CNMI) .................................. 49 D.4 Summary of Ground Water Quality............................................................................... 51 D.5 Summary of Ground Water-Surface Water Interactions................................................ 54 E. PUBLIC PARTICIPATION ................................................................................................. 55 F. REFERENCES ..................................................................................................................... 57 I. APPENDIX I: Water Body Information for Commonwealth of the Northern Marianas Islands ........................................................................................................................................... 61 II. APPENDIX II: Detailed 305b Listing of CNMI Waters..................................................... 72 II.1. COASTAL WATERS.................................................................................................... 74 II.2. LAKES AND PONDS ................................................................................................... 82 II.3. WETLANDS.................................................................................................................. 83 II.3. STREAMS ..................................................................................................................... 85 III. APPENDIX III: TMDL Priority Listing (303(d) List) ..................................................... 86 IV. APPENDIX IV: Selected Monitoring Data Used in 2012 Listing Determinations, by Water Segment.............................................................................................................................. 91 IV.1. Microbiological Data...................................................................................................... 91 *Note: Only one of the 11 monitoring locations from Segment 23 had over 10% exceedance rate however, there is such a strong historical record of attainment for both enterococci and biocriteria that it was not placed on the impaired list. IV.2. Dissolved Oxygen Data 96 IV.2. Dissolved Oxygen Data.................................................................................................. 97 IV.3. Biocriteria monitoring Results ..................................................................................... 102 IV.4. Lake Susupe monitoring data (Segment ID: 18LAK; Susupe) ................................... 106 Tables Table B-1. Atlas Description of the Commonwealth of the Northern Mariana Islands ................ 6 Table B-2. Class A Marine Waters in CNMI ................................................................................ 7 Table C-1. Designated Use terminology as used in this report.................................................... 20 Table C-2. Selected CNMI Water Quality Criteria................................................................ 21 Table C-3. EPA "CALM" Reporting Categories......................................................................... 22 Table C-4. Assessment Criteria for Coastal Waters .................................................................... 27 Table C-5. Assessment Criteria for Fresh Surface Waters .......................................................... 28 Table C-6. Size of Surface Waters Assigned to Reporting Categories, 2012 Assessment Results ....................................................................................................................................................... 29 Table C-7. Segment/Pollutant Combinations Removed from CNMI's Previous Section 303(d) List ................................................................................................................................................ 32 Table C-8. Ocean coasts - Designated Use Support Summary.................................................... 33 Table C-9. Size of Ocean Coast Waters Impaired by Causes...................................................... 33 Table C-10. Size of Coastal Waters Impaired by Sources........................................................... 33 Table C-11. Rivers/streams Designated Use Support Summary........................................... 37 Table C-12. Lake/pond Designated Use Support Summary........................................................ 38 Table C-13. Freshwater Wetland Designated Use Support Summary......................................... 39 Table C-14. Assessment Methodology for Wetlands, using HGM Functions ............................ 40 Table C-15. 303(d) Listing for
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