PROJ00318

• Contract/PO #: C153618
• Contractor Name: Greeley, City of
• Contract Type: Loan
• Water District: 3
• County: Larimer
• Bill Number: SB 87-15
• Loan Projects - Doc Type: Feasibility Study

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6.0 WATER QUALITY

Water released from Peterson lake Reservoir is thoroughly mixed with river
water prior to diversion into treatment facilities. For the water quality
analysis, the station on the Cache 1a Poudre River near Fort Collins was
selected for comparisons with municipal drinking water standards. It is
located 11 miles northwest of Fort Collins, just upstream of the North Fork of
the Cache 1 a Poudre Ri ver. Records are avail abl e from October; 1979 to the
present. Samples were collected monthly and subjected to a full range of
chemical tests. These data are summarized on Table IV.9. The table shows the
range of concentrations for each water quality parameter and its standard, or
1 imit.

===============================================================================

Table IV.9. Water Quality for the Cache la Poudre
River near Fort Collins, Colorado for Water Years
19S0 - 19S3

Parameter

Range
low Hi gh

34 120

None

Umi t

Specific Conductance
(micromhos)
pH (units)
Hardness (mg/1)
Alkalinity (mg!1)
Sodi um (mg/1)
Sul fate (mg/l)
Chl ori de (mg/1)
Fl uori de (mg/1)
Dissolved Solids (mg/1)
Nitrogen (Nitrate +
Nitrite)(mg/l as N)
Arseni c (ug/1) 0 2 50
Bari um (ug/1) 0 400 1000
Cadmi um (ug 11 ) 0 3 1 0
Chromi um (ug/l) 0 10 50
Copper (ug/1) 0 24 1000
Iron (ug/1) 9 170 300
lead (ug III 0 27 50
Manganese (ug/1) 0 7 50
Mercury (ug/1) 0.4 2
Selenium (ug/l) 0 1 10
Silver (ug/1) 0 7 50
Zi nc (ug/l) 0 80 5000 _________
======================================================================---------

7.0
11
13
1.3
.7
.3
.1
24
o

8.3
46
52
6.2
12
2.6
.5
79
.19

None
None
None
20
250
250
1.4-2;4
500
10

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