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• Overburden <br />Data was collected from each of the overburden wells (MW-10 and MW-20) 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 well MW-20 was dry during the <br />1996 baseline monitoring period and was not sampled. <br />Results from the laboratory analyses was interpreted through the use of Piper and Stiff diagrams. <br />The principal water type observed in well MW-10 is a sodium bicarbonate type. This water is <br />typically neutral to partially alkaline, with low hardness, and low to moderate salinity. The pH <br />ranges from 7.86 to 8.5 and hardness ranges from 17 to 80 mg/L. Total dissolved solids in the <br />samples ranged from 510 to 670 mg/L (filterable residue). <br />All parameters required for analysis were compared with the applicable CDPHE and CDMG <br />standards. Exceedances from the groundwater standards of aluminum, antimony, fluoride, <br />manganese, iron, pH and total dissolved solids were observed in well MW-10. These <br />exceedances reflect limitations for domestic and agricultural use. SAR levels ranged from 9.73 <br />to 29.20. Electrical conductivity ranged from 0.563 to 2.090 mmhos/cm, periodically exceeding <br />the CDMG damage standard. Wells MW-20 and MW-30 remained dry during the 1996 <br />monitoring and sampling period and were not sampled. <br />• Ciruela Coal <br />Data was collected from each of the wells screened in the Ciruela coal (MW-1C, MW-2C and <br />MW-3C) during the 1996 baseline monitoring period. Each of the wells were monitored montlily <br />for field parameters and water samples were obtained for laboratory analyses. Monitor wells <br />MW-2C and MW-3C were 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 in well MW-1C is a sodium bicarbonate type. This water is <br />typically neutral to partially alkaline. The pH ranges from 8.27 to 9.40 and hardness ranges from <br />7 to 9 mg/L. Total dissolved solids in the samples ranged from 440 to 550 mg/L (filterable <br />residue). <br />All parameters required for analysis were compared with the applicable CDPHE and CDMG <br />standards. Exceedances for iron, pH and total dissolved solids were observed in well MW-1C. <br />In addition, beryllium was reported with a detection limit greater than the human health standard. <br />SAR levels ranged from 32.10 to 33.20. Electrical conductivity ranged from 0.110 to 1.620 <br />mmhos/cm. As noted previously, wells MW-2C and MW-3C remained dry during the 1996 <br />monitoring and sampling period and were not sampled. <br />~J <br />PERMIT.ClS\Dcsmba Z0. 1996 2.04-22 <br />