Curecanti National Recreation Area: Personal Watercraft Use Enviornmental Assessment

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Contents ArcheologicalResources .................................................................................. .............................70 SocioeconomicEnvironment ................................................................................... .............................71 National Recreation Area Management and Operations ....................................... ............................... 71 EnvironmentalConsequences ...................................................................................... 72 ............................... Summaryof Laws and Policies ..................................:.......................................... ............................... 72 General Methodology for Assessing Impacts ........................................................ ............................... 72 CumulativeImpacts ........................................................................................ ............................... 74 r Impairment Analysis ....................................................................................... ............................... 74 PWCand Boating Use Trends ............................................................................... ............................... x 75 CurrentUse Estimates: ................................................................................................................... 75 FutureUse Trends ........................................................................................... ............................... 76 WaterQuality ........................................................................................................ ............................... 77 Guiding Regulations and Pol icies ..................................................................... .............................78 Methodologyand Assumptions ...................................................................... ............................... 79 ImpactAnalysis Area ...................................................................................... ............................... 83 Impact to Water Quality from PWC Use ........................................................ ............................... 83 AirQuality ............................................................................................................. ............................... 89 Guiding Regulations and Policies ................................................................... ............................... 89 Methodologyand Assumptions ........................................................................ .............................91 ImpactAnalysis Area ...................................................................................... ............................... 93 Impact to Human Health from Airborne Pollutants Related to PWC Use ...... ............................... 93 Impact to Air Quality Related Values from PWC Pollutants ......................... ............................... 97 Soundscapes............................................................................ ............................... ............................100 Guiding Regulations and Policies ..................................... ............................... ............................101 Methodologyand Assumptions ........................................ ............................... ............................103 ImpactAnalysis Area ........................................................ ............................... ............................104 Impact to Visitors from Noise Generated by Personal Watercraft .................. ............................105 Wildlife and Wildlife Habitat ................................................... ............................... ...........................109 Guiding Regulations and Policies ...................................... ............................... ...........................109 Methodologyand Assumptions ........................................ ............................... ............................109 ImpactAnalysis Area .................................................................................... ............................... 110 Impact of PWC Use and Noise on Wildlife and Habitat .. ............................... ............................110 - Threatened, Endangered, or Special Concern Species ............. ............................... ...........................113 Guiding Regulations and Policies ..................................... ............................... ............................114 Methodologyand Assumptions ........................................ ............................... ............................114 ImpactAnalysis Area ........................................................ ............................... ............................115 Impact of PWC Use on Such Species ............................... ............................... ............................115 Shorelines and Shoreline Vegetation ....................................... ............................... ............................120 Guiding Regulations and Policies ..................................................... ............................... Methodologyand Assumptions ........................................ ............................... ............................120 ImpactAnalysis Area ........................................................ ............................... ............................120 Impact to Sensitive Shoreline Vegetation from PWC Use and Visitor Trampling ......................121 xi