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r <br />r <br />3 <br />INTENTIONS: <br />The facility discussed serves a dual purpose; sedimentation control and water storage <br />for haul road dust suppression. Since available water on the property is limited, the <br />Company proposes to install an elbow and decant riser on the culvert to increase the <br />normal operating pool level from 7065.2 to 7068.5. The 7068.5 elevation corresponds to <br />afour-inch-diameter hole cut in the riser section with the decant overflow elevation set <br />at 7072.5. The author could not ascertain the purpose of the four-inch-diameter hole. <br />The reservoir leve] increase from 7065.2 to 7068.5 increases the normal total storage <br />from 11 to 16 acre-feet and storage at decant inlet is estimated to be 25 acre-feet. <br />Mr. Gehrke stated during our conversations that he was dissatisfied with the current <br />condition of the open channel emergency spillway and that repairs were slated for the <br />upcoming construction season. Depending upon management decisions, the spillway <br />will be either rehabilitated at the current location or reconstructed at a new crest <br />elevation. It was pointed out that a well defined channel must be developed from the <br />spillway crest to the stream channel and that it must be well protected. <br />Please contact this office if there are any questions regrading this report. <br />cc: J. Spicer <br />J. Mulhern <br />M. Stanton <br />E. St Louis <br />B. Keffelew <br />Acting Chief, S&H'I'C <br />