Curecanti National Recreation Area: Personal Watercraft Use Enviornmental Assessment

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Summary TABLE A: SUMMARY OF THE IMPACT ANALYSIS Alternative B: Reinstate PWC Alternative A: Reinstate PWC under Use Additional Regulation as Previously Management Prescriptions Allow Im pact .. . - Water Quality PWC use impacts Negligible to PWC use impacts Same as PWC use impacts Beneficial minor adverse effects in 2002 alternative A. impact with eliminating and 2012 based on impacts Cumulative impacts Same as personal watercraft. from benzo(a)pyrene, naphthalene and benzene alternative A. Cumulative impacts Similar to (human health (ingestion of alternative A, remaining water and fish). motorboats would be negligible adverse for all ecotoxicological Cumulative impacts Negligible benchmarks. Impacts would be adverse in 2002 and 2012 for reduced to minor adverse benzo(a)pyrene, naphthalene, impacts when the half -life of and benzene would be minor to benzene is considered. moderate adverse based on human health benchmarks and EPA and State of Colorado water quality criteria. Impacts would be reduced to minor adverse impacts when the half - life of benzene is considered. Air Quality PWC use impacts Negligible PWC use impacts Same as PWC use impacts Beneficial adverse impacts for CO, HC, alternative A. impacts from banning PWC PM and NO, for the year Cumulative impacts Same as use because of decreased 2002. In 2012, the impact level alternative A. emissions. would remain negligible Cumulative impacts Reduced adverse. Risk from PAH would emissions from other craft as be negligible. compared to alternative A, with Cumulative impacts Negligible no contribution from PWC use. adverse for PM 10 , HC, and Negligible adverse for PM 10 , NO., and minor adverse for CO HC, and NO to minor adverse in 2002 and 2012. CO for CO. emissions would increase from Future emission levels would 2002 to 2012. Existing air remain relatively stable, with quality maintained, with future increased CO emissions and reductions in PM and HC slightly increased emissions due to improved emissions as a result of result emission controls. increased boating activity and the conversion to cleaner engines. HC and PM would continue to decline, but impacts would remain negligible to minor and adverse. Air Quality Related PWC use impacts Minor PWC use impacts Same as PWC use impacts Beneficial Values from PWC adverse impacts from PWC. alternative A. impacts on air quality related Pollutants Cumulative impacts Minor Cumulative impacts Same as values. adverse from motorized boats alternative A. Cumulative impacts Minor and personal watercraft in both adverse impacts from 2002 and 2012 based on motorized boat emissions in pollutant emissions being less both 2002 and 2012, based on than 50 tons per year, no regional SUM06 values, with observed visibility impacts or very little influence from ozone - related plant injury, and existing or forecast Curecanti regional SUM06 values, with watercraft operations. very little influence from existing or forecast Curecanti watercraft operations.