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Industrial Wastewater Inspection Report <br />Powderhorn Coal Company, Permit # CO-00271 d6, Mesa County <br />April l9, 2001. Page 5 of6 <br />flow? <br />The physical conditions of each discharge point were in good condition. Discharge <br />point 002 was the only point discharging during the inspection. Discharge point 001 <br />is the only other point that discharges on a regular basis. No flow measurements <br />were taken during the inspection. <br />14. [s the permittee maintaining records as required in the permit'? Yes <br />1~. Are there any impoundments, land application, or ground water monitoring wells <br />present? Yes <br />Is there potential ground water impact? No <br />If YES, please explain in detail. <br />Currently the sediment detention ponds are dry. If they were to fill up, there is <br />potential for an ex-filtration because they are not lined. A certified engineer checks <br />all the detention ponds and the dams on a quarterly basis. Nineteen monitoring <br />wells have been placed around the property for the purpose of monitoring the water <br />quantity and quality inside the mines. These wells are not located in positions that <br />would determine seepage from the sediment detention ponds. Four piezometer wclls <br />are located on hillsides with spoil piles to determine slope conditions. The <br />groundwater wells and piezometers are checked on a quarterly basis. <br />16. Flow measurement present? Only on discharge points OOl and 002 <br />[f so, please describe the device and outfall. <br />Discharge point 001 is a 4-inch pipe with a turbine meter to measure discharge. The <br />outfall is piped onto riprap that leads to the Colorado River. <br />Discharge point 002 is a 6-inch pipe with a disk meter to measure discharge. The <br />outfall is discharged onto riprap that leads to the Colorado River. <br />The CDPHE recommends the operator get the meters calibrated on a regular basis. <br />The last time the meters were calibrated could not be determined but was at least <br />one year ago. <br />l7. [s the effluent incompliance with the permit? Yes <br />l3. [s there a compliance schedule? No <br />Is the entity meeting the compliance schedule? N/.a <br />