PUB00108

• Year: 1986
• Title: St. Vrain Basin Reconnaissance Study
• CWCB Section: Administration
• Author: Colorado Water Resources and Power Development Authority
• Description: Extensive study for future study and development toward meeting the water-related needs of residents with the St. Vrain Basin
• Publications - Doc Type: Brochure

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~ Table II-I
'"
c.n
'"
("") St. Vrain Basin Reconnaissance Study
WATER QUALITY DATA
UDDp.r Basin Lower Basin
South St. North St. St. Vrain Longmont St. Vrai n St. Vrain
Vrai n Creek Vrai n Creek Creek at STP Creek Below Creek Near
Parametpr Units Ahovp. Lvons at Lonamont Dam Lvons Effluent Lonamont Mouth
DO MG/L 9.6 9.5 9.6 3.6 9.6 9.5
PH STANDARD 7.4 7.3 7.4 7.3 8.1 7,9
TALK MG/L 21.8 10.0 19.7 214.9 212.2
NO, & N03 MG/L 0.13 0.07 0.26 0.17 2.4 3.13
NH3 & NH4- MG/L 0.08 19.00 2.0 1. 18
T Hardness MG/L 23.2 10.9 24.0 545.5 512.8
Calcium MG/L 6.8 3.3 7.1 101.6 249.6
Magnesium MG/L 1.5 0.7 1.6 70.9 63.7
Sodium MG/L 3.1 1.9 3.4 98.7 107.4
Potassium MG/L 0.6 0.4 0.6 5.2 5.2
Chloride MG/L 1.1 0.7 1.4 17 .2 29.5
Sulfate MG/L 5.7 4.1 7.7 505.5 488.9
fluoride MG/L 0.2 0.14 0.2 1.1 1.0
Arsenic UG/L 1.0 4.5 1.2 1.0
Barium UG/L 200.0 200,0
Berylium UG/L 200.0 0.3 16.8 25.0
Cadmium UG/L 3.0 0.0 5.0 0.2 0.2
Copper UG/L 2.0 1.5 5.2 12.1 12,3
Iron UG/L 51.3 120.0 1.274.3 1,014.5
Lead UGIL 6.0 1.0 30.0 6.9 5.4
Manganese UG/L 10.1 8.8 75.5 127.6
Zinc UG/L 20.0 10.0 16.0 32.6
Selenium UGIL 1.0 1.0 40.0 2.5 2.5
Mercury UG/L 0.5 0.5 8.0 0.4 0.4
Fecal
Coli form /100 m1 0.0 40.5 540,000 2,288 8,908
TDS MG/L 40.3 23.1 41.0 965.3 984.9
Conductivity MICROHMS 60.9 27.9 70.0 964.2 1,331. 1 1,281.0

(1) Blanks indicate no data available.
(2) Data represents average values. generally representing mid to late 197015
conditions.

SOURCE: EPA Storet System, Denver, Colorado.

(80353C)

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