HYDRO27746

• Permit No: M1977410
• IBM Index Class Name: Hydrology
• Doc Name: REFERENCES
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
Permit Number CO-0032751 Paga 1 .
APPENDIX A
Water Quality Standards for Segment 3 (Boulder Crsek Sub-basin):
pbyeical and Biological
Diaaolved Oxygen = 6.0 mq/1, 7.0 mq/1 (spawning); (minimum)
pH = 6.5 - 9.0 s.u. (minimum - maximum)
Pscal Colifarm Bacteria = 2000 org/100 ml
Ammonia as N (NH3) = 0.02 mq/1 (unionized)
Residual C12 = 0.003 mg/1
Cyanide (free) = 0.005 mq/1
Sullide as H2S = 0.002 mq/1 (undiee ociated)
Boron = 0.75 mq/1
Nitrite as N (NO2) 0.05 mg/1
Nitrate as N (NO3) = 10.0 mg/1
Chloride (C1) = 250 mg/1
Sulfate (504) = 250 mg/1
Nstale Chronic WOS Acute WOS
Arsenic, Total (AS) 0.05 mg/1
Cadmium, Dissolved (Cd) • = 0.0011 mq/1 0.0039 mg/1
Chromium, tri (Tot Rsc) = 0.05 mq/1
Chromium, hex (Cr, Dis) 0.011 mg/1 0.016 mq/1
Copper, Diaaolved (Cu) • 0.012 mg/1 0.018 mg/1
Iron, Soluble (Fe) = 0.3 mgjl
Iran, Total Recov. (Fe) = 1.0 mg/1
Lead, Diaaolved (Pb) • 0.0039 mg/1 0.096 mg/1
Manganese, Soluble (Mn) 0.05 mq/1
Manganese, T. Rec. (!Sn 1.0 mg/1
Mercury, Diaaolved (Hq) •* = 0.00001 mg/1 0.0024 mq/1
Nickel, Diaaolved (Ni) * = 0.096 mq/1 0.92 mg/1
Selenium, Total (Se) = 0.01 mg/1
Silver, Diaaolved (Ag) * 0.00008 mg/1 0.0020 mg/1
Zinc, Diaaolved (Zn) • 0.045 mg/1 0.11 mg/1
* Theea metal standards are based on equations which are hardness dependent
ae specified in Table III of the Basic Standards and Methodolooiee for Surface
Water (3.1.0) (reference 1). The total hardness (aa CaC03) used for this
permit was 100 mg/1.
'* The FRV (Fish) standard for mercury is to be used for determining the
30-day average limitation for segment 3.