Upper Los Pinos Water Quality Report

• Document ID: hr_0007
• Contract/PO #: PO 05-64
• County: La Plata
• County: Hinsdale
• County: San Juan
• Stream Name: Los Pinos River
• Basin: San Juan/Dolores
• Sub-Basin: Upper San Juan 14080101
• Water Division: 7
• Title: Water_Quality Data Synthesis for the Upper Los Pinos River Watershed, SW Colorado, and Suggestions for a Watershed Plan, 2005
• Date: 1/1/2005
• Prepared For: CWCB
• Prepared By: Southwest Hydro-Logic
• Watershed Pro - Doc Type: Planning Report

Table 2. Summary statistics for water properties and constituent concentrations in streams, high altitude lakes,
ground water, and Vallecito Reservoir in the upper Los Pinos River watershed
Streams High Altitude Lakes Ground Water Vallecito Reservoir
Constituent Minimum Avera e Maximum Minimum Avera e Maximum Minimum Avera e Maximum Minimum Avera e Maximum
Field specific
conductance,
uS/cm @ 25oC 11 76 309 7 14 22 53 293 580 40 78 136
Lab specific
conductance,
uS/cm @ 25oC 33 69 342 - 75 186 398 61 78 90
Field pH,
standard units 4.80 7.60 9.20 6.10 6.95 7.50 6.74 7.12 8.00 5.82 7.50 9.40
Lab pH,
standard units 6.50 7.65 9.10 5.20 7.12 8.70 7.00 7.82 8.30 7.31 7.78 8.00
Temperature,
oC -0.2 5.6 20.8 1.0 8.1 14.0 7.0 11.6 15.5 3.6 13.3 58.0
Dissolved
oxygen (DO),
mg/L 9.7 17.0 - - - - 0.3 7.2 12.0
Dissolved
oxygen, percent
saturation 10 73 100 -- -- -- -- -- -- 3 92 431
Hardness as
CaCO3 (Ca, Mg),
mg/L 12 35 103 230 245 260 38 39 39
Alkalinity,
total as CaCO3,
mg/L 2.0 28.0 163.2 1.0 3.2 6.0 26.2 118.7 302.0 23.1 30.7 37.0
Bicarbonate
(HCO3), mg/L 37.1 199.0 32.0 144.8 368.3 28.1 37.4 45.0
Calcium,
total (Ca),
mg/L 9.7 13.7 18.3 -- -- - - -- -- --
Calcium,
dissolved (Ca),
mg/L 1.1 9.3 53.0 0.8 1.8 3.0 9.0 44.0 92.0 8.1 10.8 16.7
Magnesium,
total (Mg),
mg/L 1.4 2.3 3.2 -- - -- -- -- -- -- -- --
Magnesium,
dissolved (Mg),
mg/L 0.2 2.0 11.0 0.1 0.2 0.4 2.0 7.4 12.6 1.5 1.9 2.6
Sodium,
dissolved (Na),
mg/L 0.1 1.1 6.7 0.1 0.2 0.5 0.6 6.7 36.0 0.8 1.1 1.7
Potassium,
total (K),
mg/L 0.8 0.8 0.8 -
Potassium,
dissolved (K),
mg/L 0.2 0.6 3.9 0.1 0.1 0.2 0.5 1.4 1.9 0.3 0.7 1.5
Sulfate,
dissolved
(SO4), mg/L t2 8.3 36.0 0.7 2.0 3.5 3.0 9.9 21.2 3.6 4.9 6.8
Chloride,
dissolved
(CI), mg/L 0.1 0.6 10.0 0.0 0.1 0.3 0.2 1.8 11.0 0.2 0.3 0.9
Fluoride,
dissolved
(F), mg/L 0.0 0.2 0.9 0.1 0.2 0.3 0.3 0.5 0.6 0.2 0.2 0.2
Bromide

Silica,
total
(SiO2),
mg/L 3.8 6.4 7.6 -- -- -- -- -- -- -- -- --
Silica,
dissolved
(SiO2), mg/L 1.5 3.6 8.2 0.4 0.8 1.5 7.3 9.2 11.0 2.4 3.9 4.5
Water-Quality Data Synthesis for the Upper Los Pinos River Watershed, In cooperation with the Colorado Watershed Protection Fund and
Southwestern Colorado, and Suggestions for a Watershed Plan, 2005 the San Juan Resource Conservation and Developrnent Council