Laserfiche WebLink
Larencim Cwvon Mine - Growdwarer rechnicn! ReOOrt <br />• <br />Exceedances for total dissolved solids were observed in windmills WMLPC-1 and WMCWC-1. <br />The pH standards were exceeded in windmills WMCWC-2, WMBC-2 and WMLPC-1. SAR <br />levels ranged from 6.70 to 7.60. Electrical conductivity ranged from 0.650 to 1.439 mmhos/cm. <br />Alluvium <br />Data was collected from each of the alluvial wells (MWAC-1, MWCC-1, MWCWC-1, MWCWC- <br />2, MWJC-1, MWLC-1, MWLC-2, MWLC-3, MWLC-4 and MWPC-1) during the 1996 baseline <br />monitoring period. Each of the wells were monitored monthly for field parameters and water <br />samples were obtained for laboratory analyses. A summary table showing the results from all the <br />alluvial wells is included in Appendu• GW-2. <br />Results from the laboratory analyses was interpreted through the use of trilinear and Stiff <br />diagrams. Copies of these diagrams are included in Appendix GW-3. The principal water type <br />observed in the alluvial wells is acalcium-sodium bicarbonate type. This water is typically neutral <br />with low hardness, and low to moderate salinity. The pH ranges from 7.05 to 8.37 and hardness <br />ranges from 177 mg/L to 302 mg/L. Total dissolved solids in the samples ranged from 152 to 880 <br />mg/L (filterable residue). <br />• All parameters required for analysis were compared with standards similar to windmill results. <br />The standards and results are listed in Table GW-7. The method detection limit was reported <br />greater than the Human Health Standards for beryllium for the samples obtained from all the <br />alluvial wells, except well MWCWC-1. Exceedances of iron from the secondary drinking water <br />standard were observed in wells MWCWC-2-1 and MWLC-4. The agricultural and secondary <br />drinking water standards for manganese were exceeded in wells MWAC-1, MWCC-1, MWCWC- <br />2, MWJC-1, MWLC-3 and MWPC-1. The secondary drinking water standard for sulfate was <br />exceeded in wells MWCWC-1, MWCWC-2 and MWJC-1. Sites MWCC-1, MWCWC-1, <br />MWCWC-2, MWJC-1, MWPC-1, and WMLPC-1 exhibited specific conductance values which <br />periodically exceeded the CDMG material damage standard of 700 µmhos/cm. Total dissolved <br />solids standards were exceeded in wells MWLC-1, MWPC-1, WMCWC-1, and WMLPC-1. SAR <br />levels ranged from 1.19 to 6.39. Electrical conductivity ranged from 0.315 to 1.667 mmhos/cm. <br />The human health standard for silver was exceeded in WMCWC-1. <br />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 monthly 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. A summary table showing the results from <br />the overburden well is included in Appendix GW-2. <br />• <br />GrounEwater.475~Decemher 9, 1996 23 <br />