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4.8.5.2a Ground-Water Monitoring 1988-1992
<br />Wells GC2, Coy and GP1 through GP9 are proposed to be added to the list of groundwater monitoring
<br />sRes (see Table 4.8-13a). The quarterly sampling of the far eastern wells is dropped because mining
<br />should not affect the groundwater systems on the eastern side.
<br />The Cottonwood and West Buzzard Springs are included in the monitoring program to define the
<br />changes inflow and water quality in these springs.
<br />Beginning in 1988, Trapper will initiate a spring survey program. The survey will cover those areas in
<br />and adjacent to mined areas where springs could establish due to recharge through recontoured
<br />spoils. The program will inventory and sample those springs exhibRing a five gallons per minute or
<br />greater flow. If weather allows the survey will be completed by May 15th of each year. LIST C of Table
<br />4.8-12a shows the parameters to be evaluated. In addition one spring wthin each major drainage and
<br />from each pit area within the drainage will be sampled for the parameters in LIST B of Table 4.8-12a.
<br />Table 4.8-12a presents the adjusted list of parameters to be monitored. Iron has been removed from
<br />LIST C, while TDS has been added. Definition of variations in iron concentrations is not very useful
<br />since the range in this parameter has been defined. TDS is added to the quarterly list until a good cor-
<br />relation between TDS and conductivity is established. Carbonate has been added to list B when the
<br />pH is greater than 8.3.
<br />The hydrologic data derived from each year's monitoring will pe provided to the Division by March 15 of
<br />the following year. Beginning in 1989, the results of the inventory and samples obtained from spoil
<br />related springs will also be included in the annual hydrologic report (Appendix W).
<br />In accordance with TR-44 '1988 Annual Report' approval, the following wells no longer require quar-
<br />terly TDS analysis but still require annual TDS analysis; GAi, GA-2, GB-5, GC-1, GD-1, GD-2, GE-1, GE-
<br />2, GF-1, GF-2, GF3, GF-4, GF-6, GP-1, GP-2, GP3, GPI, GP-5, GP-6, GP-7 and GP-8.
<br />In accordance with TR~B '1989 Annual Report' approval, the following groundwater sampling changes
<br />become effective:
<br />1) Vanadium was dropped as a sample parameter in the B&D lists; 2) Total concentrations for Arsenic,
<br />Barium, Cadmium, Chromium, Copper and Selenium were dropped from the B, D, and E parameter
<br />lists and replaced by dissolved sampling requirements; 3) Ash wells GD-2, GD3, GF-5, GF-6 and GF-
<br />11 will be sampled by the B8C lists (C list replaced D list) until ash disposal occurs in areas upgradient
<br />of these wells. At that time, the D parameter list will be adapted for these wells, replacing the C-list.
<br />In accordance with TR-54 '1990 Annual Report' approval, the frequency of sampling for the following
<br />groundwater wells has been mod'rfied to allow for biannual sampling (spring and fall): GA1, GA2, GB2,
<br />GBS, GDi, GD2, GD3, GE1, GE2, GF1, GF2, GF3, GFS, P5, 81-03A, GP3, GP4, GPS, GP6, and Cotton
<br />Wood spring. In the event ash disposal occurs in the vaciniry of GD-3, quarterly monitoring will be
<br />required.
<br />Well depth sampling will continue to be conducted on a quarterly basis for all appropriate monitoring
<br />wells.
<br />4-247a
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