3. Determination of the water quality (criterion) values necessary to protect
fish, aquatic life, and
    recreational uses for Little Sand, Duck, and Deep Hole Lakes.

4.  Comparison of resulting lake concentrations from step 2 to the standards
determined in step 3 in
    order to predict if adverse impacts to water quality could result.

From the modeling results, a deposition rate was determined (in milligrams
per square meter per
year) for the surface area of each lake. The maximum deposition values for
each parameter were
used to simulate a worst case condition (Table 3-21).



                                      Table 3-21
                Maximum Aerial Loading of Heavy Metals to Little Sand,
                       Duck, and Deep Hole Lakes (mg/m2/year)
Airborne Pollutant        Little Sand              Duck
     Lead                 2.0 x 10i T            3.9 x 10-3
     Copper               3.8x 10-3              6.1 x10-3
     Zinc                 2.0x10-2               3.1 x10-2
     Cadmium              7.0 x 10-6             2.6 x 10Ws
     Arsenic              6.8 x 10-4             2.4 x 10-3
     Mercury              1.6 x 10-6             5.3 x 10-W
     Chromium             1.1 x 10-5             4.1 x 10-5
     Nickel               2.0x 10-5              7.0x 10-5



Deep Hole
1.6 x 10-
2.1 X 10-3
1.1 x 10-2
5.4 x 10-6
5.1 x 10-4
1.1 x 10-6
8.7 x 10- 6
1.5 x 10-5



Concentration levels for each parameter also were calculated based on lake
retention times during
average baseline conditions. The resultant lake concentrations from airborne
contaminants are listed
in Table 3-22 for Little Sand, Duck, and Deep Hole Lakes.

                                           Table 3-22
                       Predicted Lake Impacts from Airborne Contaminants



           Criterion
Pollutant  Values'



Lead
Copper
Zinc
Cadmium
Arsenic
Mercury
Chromium
Nickel



.0016
.0143
.0712
.0022
.29
.00015
.0082
.002



Ave. Background
Lake Levels2
Little
Sand     Duck



<.01
.005
.018
<.0015
<.001
<.0001
<.001



(.01
.0045
.017
.0015
< .001
<.0001
<.001



        Max. Concentrations Expected from
        Airborne Contaminants for
Deep    Little                           Deep
Hole    Sand3             Duck4          Hole5



<.01
<.003
.012
<.002
<.001
<.0001
<.001



2.2 x 10-6
4.1 x 10-6
2.2 x 10-5
7.6 x 10- 9
7.4 x 10- 7
1.7 x 10- 9
1.2 x 10-8
2.0 x 10- 8



3.4 x 1O-6
5.3 x 10-6
2.7 x 10- 5
2.3 x 10-8
2.1 x 10-6
4.6 x 10-9
3.6 x 10-8
6.1 x 10-8



9.2 x
1.2 x
6.3 x
3.1 x
2.9 x
6.3 x
5.0 x
8.6 x



la0- 7
1-6
1- 6
10W9
lo0- 7
10- 1 o
10-
10-



    Criterion values necessary to protect fish and aquatic life for Little
Sand, Duck, and Deep Hole
    Lakes. Values are the same for each lake due to a uniform hardness of
20 mg/l.
3  Average background data from the Environmental Impact Report (1982) Vol.
VII.
3   Residence time is 2.39 years based on average baseline conditions.
    Residence time is .37 years based on average baseline conditions.
    Residence time is 1.28 years based on average baseline conditions.
NOTE: all values in mg/l



m Table 3-22 indicate that the maximum lake concentrations that could result
from
in of airborne contaminants are several orders of magnitude smaller than
the average
ind lake concentrations (for some parameters, the average background values
are less than
:tion limit). The loading rate from airborne contaminants is unlikely to
result in any
ble changes from background conditions. Consequently, no appreciable water
quality impacts
Sand, Duck, and Deep Hole Lakes would occur as a result of deposition of
airborne
'ants from the project.



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