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7 <br /> <br />Mr. i>'illiam A. Bear <br />-~- <br />B, Brand Hams and manufacturer/supplier <br />C. Chemir_aI or 4e;ieric formula <br />D. ,l oplica ti on rate/dosage <br />C. i/se of gnu coao_ ulant aids <br />F. Lab results of jar tests <br />III. hlonitorin4 of Effluent <br /> <br />Jt.:ne 22, 1582 <br />A. Total volume of flocculant used per quarter <br />B. Discharges should be monitored for all surface water parameters in <br />Attachment A. (After a year's monitoring rig ta, the Division may reduce <br />the number of parameters reouired, based on site-specific conditions.) <br />IV. Sediment Flonitori <br />A. Se di rrr nt mnu necr7 testing rlo nrnding on tune of rnaquiant an:! r¢at hnd n. <br />ti.~~~.,.;,I, 1'f~•.- •,iim,-nl= r.~!c 1•~= l~•.ei~ ~iiu~ f~, the= rr~n,rnLrnLivu r,( <br />co.x/u Lin t, or unsuitnblo rlu<~ to cr~lloirls. <br />V. Operational Consir7e ra ti ons <br />A. If discharge will continue after closing the mine, the company must <br />commit to treating as long as required. Under .Section 4.05.2(2), <br />the facilities must be maintained until either the di.selrarge continu- <br />ously meets effluent limitations without treatment or until tl;e discharge <br />has permanently ceased. <br />Second, it appears from the sediment control design presented that <br />water would discharge through the emergency spillway as the result <br />of a 10-uear, 24-hour precipitation event. This is speci__`ically <br />prohibited by Rule 4.05.6(3)(e) and the EPA regulations _`or waste <br />water treatment upon which th_ sediment r_ont:ol regulations are based. <br />In order to avoid disc}fargine crater through the. emergency snillway durine a <br />IO-year, 24-hour storm, an open orifice dewatering device/principal spilio:ay <br />would 'nave to be ir,corperated into the pond design. Considerations fcr such <br />a device should include: <br />1. flood rooting to show detention time and to snoi:• that e,-iergency <br />snillway discharges will not occur. <br />a. a detention time of 6 to S hours is sufficient _`or most <br />flocculated sustems. <br />2. sufficient storace belo„' the elevation of the dewatering device <br />to allor.• for sediment storage. <br />~3, a configuration designed to preclude discharge of material suspended <br />on the surface film (a common problem with coal fines, oil and grease). <br /> <br />