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. ,,. ~~~~ ~~. ~~NJV~~~E, COLORADO 80461 <br />• P~NE 486-1512 <br />October 10, 1981 <br />Colorado Department of Health <br />Water Quality Control Division <br />4210 E. 11th Ave. <br />Denver, CO 80220 <br />Attention: sandy Squire <br />Re: Discharge Pit Requirements for Gravel Operation <br />Dear Sandy: <br />Per our conversation on October 8, 1981, I am officially asking <br />you for a judgement as to whether our gravel and sand operation <br />requires a NDPES permit. <br />The operation is in the northwestern section of Lake County and <br />has been in operation for a number of years. As discussed with <br />you, the processing plant wash water is contained in a closed- <br />circuit with no discharge to the nearby stream. The sediment <br />ponds are sited such that runoff water from precipitation will <br />be collected and either reused or discharged by evaporation and <br />infiltration. Also, any water from dewatering will be used in <br />a similar manner. <br />Thus the only conceivable discharge from the system which would <br />affect water in the state 'of Colorado would be that which infil- <br />trates. This water will contain unpolluted suspended solids <br />which should filter out naturally by the time they intercept the <br />ground water table. Also with this sediment movement, a natural <br />filter will be built up in the region between the gravel pit <br />and the acquifer. <br />Please address this letter with a reasonable amount of haste <br />since the entire permit must be submitted to the Mined Land <br />Reclamation Board October 18, 1981. If it appears that an <br />application will be required, please contact me. If you have <br />any questions or comments, please feel free to call. <br />Sincerely, <br />~uA.-Glut NP1..Ei~~tA--C~~+---- __ <br />Michael Henderson <br />Engineer <br />MH/ds <br />