The monthly average effluent limits shown on Table 4-18 were calculated using
a mas,
equation as follows:

CE = CM QM - CL QL
        QE

      CE =     The calculated monthly average effluent limit.

      C M =    The water quality criteria necessary to protect fish and aquatic
life

      C L =    The average background lake concentration (from Volume VII
of the

      QL =     The amount of water available for dilution, which would be
10% of tU
               volume (NR 102.03(4)(f), Wis. Adm. Code). Based on expected
and w(
               conditions for drawdown, this lake water volume available
for mixing
               and 115 acre ft/year for Little Sand Lake, respectively, and
82 and 9
               for Deep Hole Lake, respectively (based on data from DNR lake
mod

      QE =     The volume of groundwater augmentation under expected and
worst 4
                conditions. For Little Sand Lake, it is 916 and 1144 acre
ft/year, res
                Deep Hole Lake, it is 140 and 165 acre ft/year for expected
and wors
                conditions, respectively (based on projections from DNR lake
models

      Q M =    QL + QE, which equates to the total lake water volume taking
into a(
                flushing rate. For Little Sand Lake, it is 1011 and 1259
acre ft/year
                Hole Lake, it is 222 and 261 acre ft/year for expected and
worst casE
                respectively.

Very little impact to Duck Lake water quality is expected due to the low
augmentatio
(8 and 12 gpm).

                                           Table 4-17
                   Projected Water Quality for Deep Hole and Little Sand
Lakes
                                 with Groundwater Augmentation



                                           Deep Hole Lake
                                                      Projected
                                          Average    Lake Water
                                          Background Quality @
                             Average     Lake Water Groundwater
                             Groundwater Concentra- Pumpage
                             Quality     tions       rates
Parameter                    (Range)'     (Range)2    of 87/102 gpr
Iron                        .35 (<.01-1.25).13 (.05-.42) .16/.16
Total Phosphorus            .020 (<.01-.05).03 (<.01-.12).03/.03
Nitrates                    .24 (<.05-.59) .05 (<.01-.39).08/.08
Field Conductivity (umhos/cm)191 (122-285) 28 (17-85)  52/52
Total Alkalinity (lab)    119 (102-187) 5 (<1-28)   22/22
Total Hardness              123 (87-152)   15 (8-36)     31/31
Total Dissolved Solids    156 (105-219) 58 (8-196)  72/72
pH (S.U.)                    7.6 (6.2-8.4) 6.1 (5.4-6.6) 6.3/6.3
NOTE:    Values in mg/l unless noted differently.



I



Little Sand

Average
Background
Lake Water
Concentra-
tions
(Ranges)2
.04 (<.01-.1
.02 (<.01-.1
.11 (<.01-.5
2.7 (11-59)
2.6 (<1-6)
11 (4-24)
36 (2-173)
5.5 (4.8-6.3)



    Based on average concentration-values from test wells DMB-18, G40-R23,
G40-L
    These test wells in the stratified drift are representative of groundwater
water c
    average concentrations were calculated based on the assumption that 75%
of the
    augmentation would be from well WS-1 and 25% would be from well WS-2
(C. Sc]
    March 1986). Actual augmentation water quality may vary due to localized
diffe
    groundwater chemistry.
2   The average background concentrations and ranges obtained from Volume
VII of



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