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• Larertciro Canvon Mine -Groundwater Technical Report <br />Results from the laboratory analyses was interpreted through the use of Piper and Stiff diagrams. <br />Copies of these diagrams are included in Appendix GW-3. The principal water type observed <br />in well MW-10 is a sodium bicarbonate type. This water is typically neutral to partially alkaline, <br />with low hardness, and low to moderate salinity. The pH ranges from 7.86 to 8.5 and hardness <br />ranges from 17 to 80 mg/L. Total dissolved solids in the samples ranged from S l0 to 670 mg/L <br />(filterable residue). <br />All parameters required for analysis were compared with the applicable CDPHE and CDMG <br />standards. The standards and exceedances are listed in Table GW-8. Exceedances from the <br />groundwater standards of aluminum, antimony, fluoride, manganese, iron, pH and total dissolved <br />solids were observed in well MW-10. These exceedances reflect limitations for domestic and <br />agricultural use. SAR levels ranged from 9.73 to 29.20. Electrical conductivity ranged from <br />0.563 to 2.090 mmhos/cm, periodically exceeding the CDMG damage standard. Wells MW-20 <br />and MW-30 remained dry during the 1996 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 />A summary table showing the results from all the wells completed in the Ciruela Coal is included <br />in Appendix GW-2. <br />Results from the laboratory analyses was interpreted though the use of Piper and Stiff diagrams. <br />Copies of these diagrams are included in Appendix GW-3. The principal water type observed <br />in well MW-1C is a sodium bicarbonate type. This water is typically neutral to partially alkaline. <br />The pH ranges from 8.27 to 9.40 and hardness ranges from 7 to 9 mg/L. Total dissolved solids <br />in the samples ranged from 440 to 550 mg/L (filterable residue). <br />All parameters required for analysis were compared with the applicable CDPHE and CDMG <br />standards. The standards and exceedances are listed in Table GW-8. Exceedances for iron, pH <br />and total dissolved solids were observed in well MW-1C. In addition, beryllium was reported <br />with a detection limit greater than the human health standard. SAR levels ranged from 32.10 to <br />33.20. Electrical conductivity ranged from 0.110 to 1.620 mmhos/cm. As noted previously, wells <br />MW-2C and MW-3C remained dry during the 1996 monitoring and sampling period and were not <br />sampled. <br />• <br />Groundwattr.475\December 9. 1996 24 <br />