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III. COMMENTS -COMPLIANCE <br />Below aze comments on the inspection. The comments include discussion of observations <br />made during the inspection. Comments also describe any enforcement actions taken during <br />the inspection and the facts or evidence supporting the enforcement action. <br />This was a complete inspection of the Keenesburg Mine conducted by Susan Burgmaier of <br />CDMG. Don MacDonald of Coors Energy Company was present during the inspection. <br />The focus of the inspection was on ground water momtoring being conducted by Coors <br />Energy Company. Weather conditions were cool and paztly cloudy, ground conditions were <br />dry. <br />The mine is no longer producing coal, and is now an ash disposal facility for ash generated <br />at the TriGen power plant in Golden. Ash is currently being placed in the A pit, and the <br />B pit is temporarily inactive. <br />Records were inspected at the mine office. All required records were available for review <br />and were current. Documentation of inspected records is attached. <br />Hydrologic Balance -Sediment Pond 2 held water well below the discharge level. The three <br />inlets and the spillway channel were all in good, stable condition. There are rills (up to 3" <br />deep) on the south embankment of the pond, but none are cause for concern at this point. <br />Numerous water fowl were in and around the pond. The dugout pond was dry. <br />The operator was conducting ground water monitoring, for the third quarter of 1996, duringg <br />the inspection. The DMG insppector was present during the sample collection of the FPW, <br />DH 122, DH 96, and part of AMW 1 wells. When the inspector left the site, the operator <br />was preparing to collect samples at AMW 2 and SMW 2. <br />Observations of the operator's sampling methods were made at four wells. The operator <br />was conducting sampling in accordance with the approved Permit application, and in a <br />manner acceptable to the Division. The operator's field data instruments were operational <br />and properly calibrated, and sample gathering equipment was clean. <br />Following are field data for the first three wells sampled. <br />FPW -Fire Protection Well north of shop <br />The water level was measured at ]3' from the top of the casing (TOC). Standing water in <br />the casing was bailed five times. Water from the sixth bail was collected for a sample. The <br />field Parameters were pH 8.5, EC 700, temperature 11.8°C. The well was then pumped for <br />62 nunutes so that three well volumes were removed. After pumping, the water level was <br />13.1' from TOC. A second sample for laboratory analysis was then taken. Field parameters <br />were pH 7.7, EC 800, temperature 11.2°C. <br />DH 122 - Upgradient of mining activities <br />The water level was measured at 15.5' from TOC. Standing water in the casing was bailed <br />five times. Water from the sixth bail was collected for a sample. The field parameters were <br />pH 7.5, EC 1600, temperature 11.6°C. The well was then pumped for 15 minutes so that <br />three well volumes were removed. Field parameters were checked during pumping at one <br />Keenuburg Mine 1 September 25, 1996 <br />