2018-03-01_HYDROLOGY - C1981010 (2)

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"wc COLORADO I, �, Department of Public Health b Environment Water Quality Assessment Cadmium, Dissolved Acute Chronic 9.1 pg/l [1.136672-0.041838[n(hardness)]e(o.9151(in (hardness)) -3.1485) 1.2 pg/l [1.101672-0.0418381n(hardness)]e(0.7998(in (hardness)) -4.4451) Trivalent Chromium, Dissolved Acute 1773 pg/l e(0.819(in (hardness))+2.5736) Chronic 231 pg/l e(0.819(in (hardness))+0.5340) Hexavalent Chromium, Dissolved Acute 16 pg/l Numeric standards provided, formula not applicable Chronic 11 pg/I Numeric standards provided, formula not applicable Copper, Dissolved Acute 50 pg/I e(0.9422(in(hardness))-1.7408) Chronic 29 pg/l e(0.8545(In(hardness))-1.7428) Lead, Dissolved Acute 281 pg/l [1.46203-0.145712In(hardness)][e0.273(in (hardness)) -1.46)) Chronic 11 pg/I [1.46203-0.1457121n(hardness)][e(1.273(1n(hardness))-4.705)] Manganese, Dissolved Acute 4738 pg/l e(0.3331(ln(hardness))+6.4676) Chronic 2618 pg/I e(0.3331(ln(hardness))+5.8743) Nickel, Dissolved Acute 1513 pg/I e(0.846(1n(hardness))+2.253) Chronic 168 pg/I e(0.846(ln(hardness))+0.0554) Selenium, Dissolved Acute 18.4 pg/1 Numeric standards provided, formula not applicable Chronic 4.6 pg/I Numeric standards provided, formula not applicable Silver, Dissolved Acute 22 pg/I Y2 e0.72(in (hardness)) -6.52) Chronic 3.5 pg/l e0.72(ln(hardness))-9.06) Zinc, Dissolved Acute 564 pg/I 0.978e(0.9094(ln(hardness))+0.9095) Chronic 428 pg/I 0.986 e(0.9094(ln(hardness))+0.6235) Table A -5b TVS-Based Metals Water Quality Standards for COLCLY02 Outfalls 002, 011, 017, 020, 021, 023, 025 Based on the Table Value Standards Contained in the Colorado Department of Public Health and Environment Water Quality Control Commission Regulation 37 Parameter In -Stream Water TVS Formula: Quality Standard Hardness (mg/1) as CaCO3 = 124 Acute 3.3 pg/l [1.136672-0.041838[n(hardness)]e(0.9151(in (hardness)) -3.1485) Cadmium, Dissolved Chronic 0.5 pg/l [1.101672-0.0418381n(hardness)]e(o.7998(ln(hardness))-4.4451) Trivalent Chromium, Chronic 88 pg/1 e(0.819(ln(hardness))+0.5340) Dissolved Hexavalent Chromium, Acute 16 pg/l Numeric standards provided, formula not applicable Chronic 11 pg/l Numeric standards provided, formula not applicable Dissolved Copper, Dissolved Acute 16 pg/l e(0.9422(ln(hardness))-1.7408) Page 15 of 40 4300 Cherry Creek Drive S., Denver, CO 80246-1530 303-692-2000 www.cotorado.gov/cdphe/wqcd I