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Rule 2.' Permilt <br />Interburden <br />Data was collected from each of the interburden wells (MW-lI through MW-6I) during the 1996 <br />baseline monitoring period. Each of the wells were monitored montlily for field parameters and <br />water samples were obtained for laboratory analyses. Monitor wells MW-2I and MW-3I remained <br />dry during the 1996 baseline monitoring period and were not sampled. <br />Results from the laboratory analyses was interpreted through the use of Piper and Stiff diagrams. <br />The principal water type observed is a sodium bicarbonate type. This water is typically neutral <br />to partially alkaline, with low hardness, and moderate to high salinity. The pH ranges from 7.56 <br />to 8.98 and hardness ranges from 3 to 319 mg/L. Total dissolved solids in the samples ranged <br />from 420 to 1430 mg/L (fiilterable residue). <br />All parameters required for analysis were compared with the applicable CDPHE and CDMG <br />standards. Exceedances of the secondary drinking water standard for pH were observed in MW- <br />SI. Exceedances for iron from secondary drinking water standards and agricultural standards were <br />detected in the samples obtained from monitor wells MW-lI and MW~I through MW-6I. <br />Manganese standards for secondary drinking water were exceeded in monitor wells MW-5I and <br />MW-6I. Antimony domestic standards were exceeded in monitor wells MW-lI and MW-6I. Lead <br />and aluminum standards were exceeded in monitor well MW-6I. Fluoride agriculmral and human <br />• health standards were exceeded in monitor wells MW-4I and MW-6I. Total dissolved solids <br />standards were exceeded in monitor wells MW-lI and MW~I. SAR levels ranged from 9.73 to <br />75.10. Electrical conductivity ranged from 0.450 to 2.340 mmhos/cm, exceeding CDMG material <br />damage standards at MW-lI, MW-4I, MW-SI, and MW-6I. Wells MW-2I and MW-3I remained <br />dry during the 1996 monitoring and sampling period. <br />Primero Coal <br />Data was collected from each of the wells screened in the Primero coal (MW-4C, MW-SC and <br />MW-6C) during the 1996 baseline monitoring period. Each of the wells were monitored monthly <br />for field parameters and water samples were obtained for laboratory analyses. <br />Results from the laboratory analyses was interpreted through the use of Piper and Stiff diagrams. <br />The principal water type observed in wells MW-4C through MW-6C is a sodium bicarbonate type. <br />This water is alkaline, with low hardness, and moderate to high salinity. The pH ranges from <br />8.56 to 9.11 and hardness ranges from 4 to 81 mg/L. Total dissolved solids in the samples ranged <br />from 420 to 1430 mg/L (filterable residue). <br />All parameters required for analysis were compared with the applicable CDPHE and CDMG <br />standards. Exceedances for fluoride, iron and pH were detected in wells MW~C, MW-SC and <br />MW-6C. Total dissolved standards were exceeded in monitor well MW~C. Aluminum and <br />r~ <br />PERMIT.4]6\Dexmber 10, 1996 2.04-23 <br />