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- III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />303 866-3567 <br />Fax: 303 8328106 <br />DATE: February 21, 1991 <br />T0: Dan Mathews <br />FROM: Bill Crick &~ <br />OF Cpl <br />i.E'>., q <br />9Q <br />0 <br />• ~.~' <br />~ r8 "!6 <br />cloy Romer. <br />Govemar <br />Fretl R. Banta. <br />Division Diredar <br />RE: Seneca II-W (C-82-057), Adequacy Review for Permit Revision 1, <br />Ground Water and Water Rights Topics <br />I have reviewed the appropriate parts of Tabs 7, 13, 15, 16, 17 and 18. These <br />sections have been substantially rewritten since the permit renewal in <br />October, 1990. <br />Tab 7 describes the hydrologic systems of the permit and surrounding areas, <br />documented with extensive baseline data collection and examples from other <br />nearby surface mines. Bedrock and alluvial aquifers are thoroughly described <br />in this section. Water quality from each aquifer is evaluated for its current <br />and potential use. <br />Study of the baseline data brings up a couple of discrepancies or points which <br />could use additional discussion: <br />- A number of monitoring welis, notably 150V and nearly all of the alluvial <br />wells, are listed as having enormous concentrations of Total Suspended <br />Solids. An explanation is requested for this. <br />- Field conductivity measurements in the past have fairly consistently been <br />roughly 30q lower th an lab-determined conductivity. In a number of <br />cases, the conductivity is less than or about equal to TDS in mg/1. Is <br />this because they were not temperature-compensated prior to 1989? <br />Peabody is proposing to monitor spoil springs for discharge and water quality <br />parameters twice a year, once they develop. Although this is the currently <br />approved frequency for spoil springs, I would suggest the following more <br />speci fi c program: <br />- A survey following snow melt each year, noting the location of each spoil <br />spring with discharge of at least 10 GPM. Locations should be reported <br />to the Division by the end of May. <br />- For each spring identified: during the high-flow season, collect monthly <br />field parameters and one water quality sample. One sample (field <br />parameters plus water quality) should be collected during the low-flow <br />seasrn. This woulo result in an annual total of roughly four field <br />parameter measurements and two full-suite water-quality submittals. <br />