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November 7, 1997 ~F~,F~\1Fn <br />Mr. Jim Burnell N(~I ~ ~ 19~~ <br />Environmental Protection Specialist <br />215oCeatennial1Buildingnerals and Geology plvi~~~PR~~°'~~,r,>+,.n~~a~a~ogY <br />1313 Sherman Street <br />--~_, <br />Denver, CO 80203-22"73 <br />RE: Annual Hydrologic Monitoring Report for 1997 - Canadian <br />Strip Mine (Permit C-81-026) <br />Dear Mr. Burnell, <br />Slurco Corporation, by this letter, hereby submits the monitoring <br />data for the above referenced report. This data includes a water <br />level measurement at Well 7. Past data collected in support of the <br />Phase III analysis is also submitted herein. <br />The Canadian Strip Mine site is located on Bolton Draw, a tributary <br />of the Republican River within the North Platte River Basin. The <br />applicable receiving stream standards are designated in Region 12, <br />Stream Segment 9, which includes most tributaries of the North <br />Platte River system. Water monitoring at Canadian Strip in 1996 <br />consisted of a single full suite sampling of water from the two <br />ponds and the backfilled pit well. Grab samples were acquired from <br />the ponds and well on October 9, 1996. <br />Quarterly pond inspections for the site have been submitted <br />throughout the year. No discharges occurred from either pond, <br />however, water levels were near the discharge point, the highest <br />they have been in several years. <br />Water quality in the ponds is consistent with water quality <br />observed historically. The calcium bicarbonate waters are slightly <br />saline with total dissolved solids (TDS) concentrations ranging <br />from 145 mg/1 to 360 mg/1. The waters are alkaline and have <br />relatively low hardness, less than 186 mg/1. The water quality in <br />the ponds generally meets acute standards for all metals but silver <br />as well as all other anionic standards. Detection limits were <br />inadequate to determine compliance with some chronic metal <br />standards and ammonia concentrations. Iron concentrations were <br />elevated in the 1996 sample from Pond 1, but that is probably <br />attributable to the high total suspended solids ('711 mg/1) or <br />concentration of elements due to evaporation and the time of year <br />that the water sample was taken. The pond water quality meets all <br />CDMG Material Damage standards except the aquatic life standard for <br />marrnr~ <br />5990 Greenwood Plaza Blvd. • Suite 250 • Englewood, Colorado 80111 <br />Phone (303) 850-0930 Fax (303) 721-9298 <br />Environmental Planners, Scientis[s and Engineers <br />