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Larencito Cartvnn Mine - Graurtdwater Technical Renon • Interburden Data was collected from each of the Interburden wells (MW-lI through MW-6I) during the 1996 baseline monitoring period. Each of the wells were monitored monthly for field parameters and water samples were obtained for laboratory analyses. Monitor wells MW-2I and MW-3I remained dry during the 1996 baseline monitoring period and were not sampled. A summary table showing the results from all the Interburden wells is included in Appendix GW-2. Results from the laboratory analyses was interpreted through the use of Piper and Stiff diagrams. Copies of these diagrams are included in Appendix GW-3. The principal water type observed is a sodium bicarbonate type. This water is typically neutral to partially alkaline, with low hardness, and moderate to high salinity. The pH ranges from 7.56 to 8.98 and hardness ranges from 3 to 319 mg/L. Total dissolved solids in the samples ranged from 420 to 1430 mg/L (filterable residue). All parameters required for analysis were compared with the applicable CDPHE and CDMG standards. The standards and exceedances are listed in Table GW-8. Exceedances of the secondary drinking water standard for pH were observed in MW-SI. Exceedances for iron from secondary drinking water standards and agricultural standards were detected in the samples obtained from monitor wells MW-lI and MW-4I through MW-6I. Manganese standards for • secondary drinking water were exceeded in monitor wells MW-SI and MW-6I. Antimony domestic standards were exceeded in monitor wells MW-lI and MW-6I. Lead and aluminum standards were exceeded in monitor well MW-6I. Fluoride agricultural and human health standards were exceeded in monitor wells MW~I and MW-6I. Total dissolved solids standards were exceeded in monitor wells MW-lI and MW-4I. SAR levels ranged from 9.73 to 75.10. Electrical conductivity ranged from 0.450 to 2.340 mmhos/cm, exceeding CDMG material damage standards at MW-lI, MW-4I, MW-SI, and MW-6I. Wells MW-2I and MW-3I remained dry during the 1996 monitoring and sampling period. Primero Coal Data was collected from each of the wells screened in the Primero Coal (MW-4C, MW-SC and MW-6C) during the 1996 baseline monitoring period. Each of the wells were monitored monthly for field parameters and water samples were obtained for laboratory analyses. A summary table showing the results from all the wells screened in the Primero Coal is included in Appendix GW- 2. Results from the laboratory analyses was interpreted through the use of Piper and Stiff diagrams. Copies of these diagrams are included in Appendix GW-3. The principal water type observed in wells MW-4C through MW-6C is a sodium bicarbonate type. This water is alkaline, with low hardness, and moderate to high salinity. The pH ranges from 8.56 to 9.11 and hardness ranges L~ Groundwater 47SDecember 9. 1996 28