Drainage Basins and Sedimentation Ponds - Runoff from the stormwater control
basins around the
mine/mill complex and the MWDF would be monitored (Table 1-14). Runoff would
be collected
during or just after storm events when discharge was occurring. Drainage
basins #1 (X) and #2 (Y)
would collect runoff from the mine/mill complex. After project month 30,
#2 would discharge to the
reclaim ponds via the tailings thickener overflow pipeline. Four sedimentation
basins (D, E, F, and G)
around the MWDF and adjacent facilities would collect runoff during construction
and operation
phases.

Reporting Requirements - Exxon would be required to submit data from the
surface water monitoring
program to the DNR on a quarterly basis. An annual report summarizing the
water quality and
biological monitoring information also would be required.



Sampling
Location
Swamp Creek
Swamp Creek



                        Table 1-14
Surface Water Quality and Aquatic Ecology



Type of Monitoring
Water Quality
Water Quality



Swamp Creek       Sediment
Swamp Creek       Fish Tissue Analysis
Swamp Creek       Benthos Tissue Analysis
Pickerel Creek   Water Quality
Hemlock Creek    Water Quality
Creek 11-4        Water Quality
Creek 12-9        Water Quality
Hoffman Creek    Water Quality
Outlet Creek     Water Quality
Martin Springs   Water Quality
Hoffman Springs  Water Quality
Skunk Lake        Water Quality
Duck Lake         Water Quality
Deep Hole Lake   Water Quality
Little Sand Lake  Water Quality
Rice Lake (1)    Water Quality
                  Lake Level
Rolling Stone Lake Water Quality
                  Lake Level
Drainage Basins  Water Quality
and Sedimenta-
tion Ponds



Sampling
Frequency
Annually, Monthly
Quarterly
Monthly
Continuous
Annually
Annually
Annually
Monthly
Annually, Monthly
Monthly
Monthly
Annually, Monthly
Monthly
Monthly
Quarterly, Monthly
Quarterly, Monthly
Quarterly, Monthly
Quarterly, Monthly
Quarterly, Monthly
Quarterly, Monthly
Weekly (2)
Monthly
Weekly (2)
Weekly (when
discharging)



Monitoring Program



Station(s) Sampled
Staff Gages 2, 3, & 5a
Location U
Locations A and DS
Location A
Stations U, A and DS
Station A
Stations U, A and DS
Stream Gage 19
Stream Gage 6
Stream Gage 30
Stream Gage 23
Stream Gage E
Stream Gage 4

Lake Gage 31
Lake Gage 15
Lake Gage 12
Lake Gage 13
Lake Gage 7


Lake Gage 9



D, E, F, G, X
and Y



Parameters
Measured
1,5
   1
   1
   2
   3
   3
   3
   5
 1,5
   5
   5
 1,5
   5
   5
 4,5
 4,5
 4,5
 4,5
 4,5
 4,5

   5

   4



1 Chemical analysis for: aluminum, arsenic, cadmium, chromium (+3 and +6),
copper, cyanide,
    lead, mercury, selenium, silver, zinc, manganese, BOD, total suspended
solids, barium, fluoride,
    iron, total dissolved solids, sulfates, total sulfur, total organic carbon,
nitrate, sodium, total
    alkalinity, and hardness. Field measurements for: dissolved oxygen, temperature,
pH,
    conductivity, and flow rates (streams only) and water levels.
2   Continuous monitoring at the outfall for dissolved oxygen, flow rate,
pH and specific
    conductance; daily composite sample for total dissolved solids and total
suspended solids.
3   Chemical analysis for: aluminum, arsenic, cadmium, chromium (total),
copper, iron, lead,
    mercury, selenium, silver, sulfate, sulfur (total), and zinc.
4   Chemical analysis for: total dissolved solids, total suspended solids,
hardness, alkalinity, sulfate,
    and oil and grease. Field measurements for: specific conductance, pH,
temperature and flow
    rates (streams only); and water level and surface temperature profile
(lakes and ponds only).
5   Field measurements for dissolved oxygen, temperature, lake water level
or stream discharge and
    velocity.
(1) Rice Lake monitoring would be contingent upon access approval from the
Mole Lake Chippewa
   Tribal Council.
(2) June through March.



- 40 -