9624 ‎(2)‎

• UCREFRP Catalog Number: 9624
• Author: Bauch, N. J. and J. B. Bails.
• Title: Water-Quality Characteristics and Ground-Water Quantity of the Fraser River Watershed, Grand County, Colorado 1998-2001.
• USFW Year: 2004.
• USFW - Doc Type: \
• Copyright Material: NO

24 Water-Quality Characteristics and Ground-Water Quantity of the Fraser River Watershed, Grand County, Colorado, 1998-2001
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Figure 12. Organic carbon concentrations and discharge at the. Fraser River below
Crooked Creek at Tabernash, Colorado, 1998-2001.
where the ingestion of small amounts of water may occur (Col-
orado Department of Public Health and Environmental, 2002).
Under this classification, the geometric mean of all data for
fecal coliform bacteria must be less than 200 col/100 mL. The
geometric mean of the fecal coliform samples collected for this
report was 7.4 col/100 mL, well below the State instream stan-
dard. The maximum fecal coliform bacteria concentration was
129 col/100 mL (table 4). Fecal coliform bacteria concentra-
tions showed a seasonal pattern, with maximum concentrations
occurring in summer and lower concentrations throughout the
rest of the year (fig. 13). Maximum concentrations in summer
potentially could be of future concern, as most recreational uses
of the river would be expected to take place during that time.
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The most likely sources of fecal coliform bacteria in the Fraser
River are the wastewater-treatment facilities and domestic and
wild animals.
Ground-Water Quantity
The assessment of ground-water quantity for the Fraser
River watershed focused on the upper portion of the watershed
where the majority of development is occurring. The alluvial
aquifer and Troublesome Formation aquifer are the primary
sources of ground water for domestic and municipal use in the
Fraser River valley. The alluvial aquifer in the upper Fraser
300
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Figure 13. Fecal coliform bacteria concentrations and discharge at the
Fraser River below Crooked Creek at Tabernash, Colorado, 1998-2001.
+ Fecal coliform bacteria
Discharge
Dissolved organic carbon S
_ Particulate organic carbon /
-o- Discharge
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