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September 16, 1982 <br />-2- <br />required baseline informaticn. In :roost cases, a year's worth of hydrologic data- <br />. collection will be reeuired to meet the seasonal variation reouire.~nents of the <br />Reculations. :?oze strinoent data-co1'ection may be required for operations that <br />have to potential to impact alluvial valley floors. <br />After the baseline data-collection requirements are met, a hydrologic monitoring <br />program should be developed. This is usually accomplished during the permit <br />application review process. The apalicant should meet with the Division to <br />discuss the baseline data coI_'ected and the aaplicant's assessment of "Orobable <br />Hydrologic Consequences". Every effort wi11 be made to tailor the monitoring <br />program specifically toward the potential impacts-identified to the permit review <br />process. Data-collection requirements for the monitoring program may be increased <br />or decreased fznm the baseline requirements depending on the potential impacts <br />identified. <br />Each of the chemical parameters listed in the guideline have been researched and <br />justified for,rnnditions rnrrmronly encountered in Colorado. Numerous publications <br />and mir`'ng applications were reviewed to provide tlxe justifications. A listing <br />of all the references reviewed is available at the Division office in Denver. <br />The majority of the available data is taken from studies done in northwest Colorado. <br />,'..ittle data exists for coal mining areas in other regions of the State. Variations <br />in the baseline data-collection requirements may be necessary as data is accumulated <br />:~ these areas. Each chemical parameter was examined in terms of solubility <br />and occurrence in Colorado coal mine discharge waters. The attenuation effects <br />o: the alkaline environment on water chemistry were taken into account. HydmZogy <br />monitoring reports provided in various publications and mining files were reviewed <br />• to note actual mining-related water chemistry changes. <br />Tables I-3 present the suggested chemical parameters and procedures to be used <br />when colZectirg baseline water quality and overburden geochemistry information. <br />Tables 4 and 5 present the suggested methods of laboratory analysis to be used <br />for the various chemical aarameters. Table 6 provides the justifications for <br />the individual chemical parameters. If questions or comments arise, the potential <br />applicant is directed to contact the Division. <br /> <br /> <br />• <br />