WSP05781

• File Number: 8200.750
• Description: San Juan River General
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 4/1/1994
• Author: Robin Abell
• Title: San Juan River Basin - Water Quality and Contaminants Review - Volume I - April 1994
• Water Supply Pro - Doc Type: Report/Study

Table 15 (CONT): Stream classifications and water quality standards, Colorado

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Basin: La Plata-River, Mancos River, Numeric Standards
McElmo Creek, and San Juan River in Temporary
Montezmmr--and-Dolorescounties __n____ I ~ , I - -~ InorganIc- Metals- MoffificatiOns
Stream Seament Descriotion oesia Classifications Phvsical and Bioloaical man uan Ouarlfiers
1. Mainstem of the la Plata River, Aq life Cold 1 D.O. = 6.0 mgll NH3 (ac) = lVS S = 0.002 As lacl = 50 (free) Fe (ch. = 300 (dis) Ni (ac/cht = lVS
including all tributaries, lakes, and Recreation 1 D.O. (sp) = 7.0 mgll NH3 (ch) = 0.02 B = 0.75 Cd lacl = TVS (tr) Fe (ch) = 1000 (Trec) Se (acl = 10 (Tree)
reservoirs, from the source to the Hay Water Supply pH = 6.5.9.0 CI2 (ac) = 0.019 N02 = 0.05 Cd lch) = lVS Pb Cae/chl = lVS Ag (ac) = lVS
Gulch diversion south of Hesperus. Agriculture F. Coli = 200/1 00 ml Cl2 {chI = 0.011 NO. = 10 Crill (ae) = SO (Tree) Mn (chi = 50 (dia) Ag Ichl = lVS 1"1
CN = 0.005 CI = 250 CrVI (ac/ehl = TVS Mn Cch) = 1000 (Treet Zn Cae/ch) = lVS
504 = 250 Cu lac/chi = lVS Hg (ch) = 0.01 (Tree)
2. Mainstem of the la Plata River UP Aq life Warm 2 D.O. = 5.0 mg/l NH3 lac) = TVS S = 0.002 As lch) = 50 Fe (ch) = 1000 Se tch) = 20 All metals are
from the Hay Gulch diversion south of Recreation 2 pH = 6.5-9.0 NH3 {chi = 0.1 B = 0.75 Cd (ch) = 0.1 Pb (ch) = 43 Ag (chi = 0.1 Trec unless
Hesperus to the Colorado/New Agriculture F.Coli = 2000/100 ml Cb (ac) = 0.019 N02 = 0.05 Crlll (ch) = 100 Mn lch) = 1000 Zn (ch) = 140 otherwise
Mexico border. CI2 (ch) = 0.011 CrVI (ch) = 25 Hg (ch) = 0.05 noted.
CN = 0.005 Cu (ch) = 10 Ni (ch) = 100
3. All tributaries to the la Plata River, UP Aq life Warm 2 D.O. = 5.0 mgll
including all lakes and reservoif"s, from Recreation 2 pH = 6.S.9.0
the Hay Gulch diversion south of Agriculture F .Coli = 2000/1 00 ml
Hesperus to the Colorado/New
Mexico border.
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4~ Mainstem of the Mancos River, Aq life Cold 1 D.O. = 6.0 mgll NH3 fch) = 0.02 S = 0.002 As lac) = 50 (Tree) Fe (cht = 300 (dis) Ni <<ac/ch) = TVS
including all tributaries, lakes. and Recreation 1 D.O. (sp) = 7.0 mg/l CI2 tacl = 0.019 B = 0.75 Cd (ac) = TVS (tr) Fe (ch) = 1000 (Trec) Se (ac) -= 10 (Tree)
reservoirs, from the source of the East, Water Supply pH = 6.S.9.0 CI2 (ch) = 0.011 N02 = 0.05 Cd {chI -= TVS Pb (ac/ch) = lVS Ag (acl = lVS
West and Middle Forks to Hwy 160. Agriculture F. Coli = 20011 00 ml CN = 0.005 N03 '" 10 Crill (ac) = SO (Trec) Mn (ch) = 50 (dis) Ag fch) = lVS Itr.
Cl '" 250 CrVI (ac/chl = TV5 Mn (chi'" 1000 (Trec) Zn (ac/ch) '" TVS
504 = 250 Cu taclchl = lVS Hg (ch) = 0.01 (Trec)
,
5~ Mainstem of the Mancos River from UP Aq life Warm 2 D.O. = 5.0 mgll NH3 (ac) '" TVS S = 0.002 As Ich) = 50 Fe (ch) = 5100 Se (ch) = 20 All metals are
Hwy 160 to the Colorado/New Mexico Recreation 2 pH = 6.5--9.0 NH3 (ch. '" 0.02 B = 0.75 Cd (ch) = 1 Pb Ichl = 25 Ag (chi = 0.1 Trec unless
border. Agriculture EColi = 20001100 ml CI2 (ac) = 0.019 N02 = 0.05 Crllllch) = 100 Mn (eh) = 1000 Zn (ch) = 150 otherwise
Cl2 (ch) = 0.011 CrVI (ch) = 25 Hg (chI = 0.05 noted.
CN = 0.005 Cu (chi = 30 Ni (ch) = 100
6~ All tributaries to the Mancos River, - UP -Aq life Warm 2 0:0: -= 5".O-mgll ,
including all lakes and reservoirs, from Recreation 2 pH = 6.5-9.0
Hwy 160 to the Colorado/New Mexico Agriculture F.Coli = 2000/1 00 ml
border.

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