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• Lorenciro Carron Mine ~ GrouMwarer Technical Report from 4 to 81 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 results are listed in Table GW-8. Exceedances for fluoride, iron and pH were detected in wells MW-4C, MW-5C and MW-6C. Total dissolved standards were exceeded in monitor well MW-4C. Aluminum and manganese standards were exceeded in monitor well MW-SC. SAR levels ranged from 11.90 to 70.30. Electrical conductivity ranged from 0.410 to 2.200 mmhos/cm, exceeding CDMG material standards at MW-4C, MW-SC, and MW-6C. This water-bearing seam shows evidence of limitations for primary and secondary domestic use and agricultural use. Underburden Data was collected from each of the underburden wells (MW~U, MW-SU and MW-6U) 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 overburden 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 in wells MW-4U through MW-6U is a sodium bicarbonate type. This water is typically neutral to partially alkaline. The pI-I ranges from 7.28 to 9.07 and hardness ranges from 4 to 170 mg/L. Total dissolved solids in the samples ranged from 482 to 1650 mg/L (filterable residue). All parameters required for analysis were compared with the applicable CDPHE and CDMG standards. The standards and results are listed in Table GW-8. Exceedances for iron and fluoride were detected in wells MW~U, MW-SU and MW-6U. Exceedances for pH and manganese were detected in wells MW-SU and MW-6U. Sulfate and total dissolved solids standards were exceeded in well MW-4U. Lead and aluminum standards were exceeded in wells MW-SU and MW-6U, respectively. SAR levels ranged from 5.41 to 71.40. Electrical conductivity ranged from 0.450 to 3.260 mmhos/cm, exceeding CDMG material damage standards at MW~U, MW-SU, and MW- 6U. The water found in this zone exhibits limitations for domestic and agricultural use. Aquifer Characteristics Recharge in the Raton Basin occurs principally in the form of precipitation. Studies by Howard (1982) indicate that the recharge occurs in the area above 7500 MSL. Precipitation in this area is approximately 16.32 inches per year at 7200 feet MSL, and 14.94 inches per year at 6600 ft MSL. This illustrates that precipitation decreases substantially with a decrease in elevation. • Precipitation in the area appears to be highest in the months of May, 7uly, and August (Table GW-9). Recharge appears to occur above the 7500 MSL elevation (Howard, 1982). Recharge Groundwater.475\December 9. 1996 29