2018-03-01_HYDROLOGY - C1981010 (2)

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COLORADO De artment of Public P Health b Environment Water Quality Assessment Total Recoverable Cadmium chronic = 10 pg/l Total Recoverable Trivalent Chromium chronic = 100 pg/l Dissolved Trivalent Chromium acute and chronic = TVS effective 12/31/2019 Dissolved Hexavalent Chromium acute and chronic = TVS effective 12/31/2019 Dissolved Hexavalent Chromium chronic = 100 pg/l Dissolved Copper acute and chronic = TVS effective 12/31/2019 Dissolved Copper chronic = 200 pg/l. Total Recoverable Iron chronic = 1000 pg/l effective 12/31/2019 Dissolved Lead acute and chronic = TVS effective 12/31/2019 Total Recoverable Lead chronic = 100 pg/l Dissolved Manganese acute and chronic = TVS effective 12/31/2019 Dissolved Manganese chronic = 200 pg/l Total Recoverable Molybdenum chronic = 160 pg/1 Total Mercury chronic = 0.01 pg/l effective 12/31/2019 Dissolved Nickel acute and chronic = TVS effective 12/31/2019 Dissolved Nickel chronic = 200 pg/l Dissolved Selenium acute and chronic = TVS effective 12/31/2019 Dissolved Selenium chronic = 20 pg/l Dissolved Silver acute and chronic = TVS effective 12/31/2019 Dissolved Zinc acute and chronic = TVS effective 12/31/2019 Dissolved Zinc chronic = 2000 pg/l Table A -4c In -stream Standards for Stream Segment COLCLY02 Yampa River Physical and Biological Dissolved Oxygen (DO) = 5 mg/l, minimum pH 6.5- 9.0 E. coli chronic = 126 colonies/100 ml Temperature March -Nov = 27.5° C MWAT and 28.6° C DM Temperature Dec -Feb = 13.8° C MWAT and 25.2° C DM Inorganic Total Ammonia acute and chronic = TVS Chlorine acute = 0.019 mg/l Chlorine chronic= 0.011 mg/l Free Cyanide acute = 0.005 mg/1 Sulfide chronic = 0.002 mg/l Boron chronic = 0.75 mg/l Nitrite acute = 0.5 mg/l Nitrate acute = 10 mg/l Chloride chronic = 250 mg/l Sulfate chronic = For WS, the greater of ambient water quality as of January 1, 2000 or 250 mg/l Metals Dissolved Arsenic acute = 340 pg/l Total Recoverable Arsenic chronic = 0.02 pg/l Page 12 of 40 4300 Cherry Creek Drive S., Denver, CO 80246-1530 303-692-2000 www.colorado.gov/cdphe/wqcd I ��