2018-03-01_HYDROLOGY - C1981010 (2)

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COLORADO � Department of public e Health b Environment Water Quality Assessment Boron chronic = 0.75 mg/l Nitrite acute = 10 mg/l Nitrate acute = 100 mg/l Phosphorus chronic = 0.17 mg/l Metals Total Recoverable Arsenic chronic = 100 pg/l Total Recoverable Beryllium = 100 pg/l Total Recoverable Cadmium chronic = 10 pg/t Total Recoverable Trivalent Chromium chronic = 100 pg/l Total Recoverable Hexavalent Chromium chronic = 100 pg/l Total Recoverable Copper chronic = 200 pg/l Total Recoverable Lead chronic = 100 pg/l Total Recoverable Manganese chronic = 200 pg/l Total Recoverable Molybdenum chronic = 160 pg/t Total Recoverable Nickel acute and chronic = 200 pg/t Total Recoverable Selenium acute and chronic = 20 pg/l Total Recoverable Zinc acute and chronic = 2000 pg/l Table A -4b In -stream Standards for Stream Segment COLCLY03b Johnson Gulch, Coyote Gulch, No -Name Gulch, Ute Gulch, Pyeatt Gulch, Buzzard Gulch, Grouse Gulch, Sage Gulch, Oak Gulch, Horse Gulch, Flume Gulch, Deal Gulch Physical and Biological Dissolved Oxygen (DO) = 5 mg/l, minimum pH 6.5- 9.0 E. coli chronic = 205 colonies/100 ml Chlorophyll a = 150 mg/m2 Temperature March -Nov = 28.7° C MWAT and 31.8° C DM Temperature Dec -Feb = 14.3* C MWAT and 24.9' C DM Inorganic Total Ammonia acute and chronic = TVS effective 12/31/2019 Chlorine chronic= 0.011 mg/l effective 12/31/2019 Free Cyanide acute = 0.2 mg/l Free Cyanide acute = 0.005 mg/l effective 12/31/2019 Sulfide chronic = 0.002 mg/1 effective 12/31/2019 Boron chronic = 4.0 mg/t Nitrite acute = 10 mg/l Nitrate acute = 100 mg/l Metals Dissolved Arsenic acute = 340 pg/t Total Recoverable Arsenic chronic = 100 pg/l Total Recoverable Beryllium = 100 pg/1 Dissolved Cadmium acute and chronic = TVS effective 12/31/2019 Pae 11 of 40 4300 Cherry Creek Drive 5., Denver, CO 80246-1530 303-692-2000 www.colorado.gov/cdphe/wqcd I