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<br />1111111111111111111 <br />Richazd Mills <br />June 9, 1998 <br />Page 6 of 9 Pages <br />sedimentation ponds had a minimum safety factor of 1.3 for a normal pool with steady state <br />seepage saturation conditions. Please provide the required documentation in revised pages to the <br />Permit. <br />Item 41. Rule 4.05.6(3)(a) The Division has not been able to find a description of the method of <br />operation [treat (automatic dewatering) or contain (manual dewatering)] oil Pond 5-P 1 in the <br />Permit. From Drawing Number IV-31, the Division concludes that containment with manual <br />dewatering is the method of operation; however, no demonstration of desi;;n water quality (in <br />terms of total settleable solids or total dissolved solids) was found in the Permit. Please provide <br />a description of operation in revised pages for inclusion in the Permit. <br />Item 42. Rule 4.0~.6(3)(a). The storage volume of Pond SA-P 1 is reported as 1.90 acre feet on <br />page 5 of Exhibit 18; is demonstrated as 2.44 acre feet on page 7g of Exhibit 18, 9/27/91; and <br />illustrated as 2.7 acre feet on Drawing IV-35. Please reconcile the differences and submit revised <br />pages as may be appropriate. <br />Item 43. Rule 4.05.6(3)(c). A reference is made to a "Standazd Dewatering Device" on Drawing <br />IV-31. The Division has not been able to find a description of this device. Please advise the <br />Division as to its location, delete the reference, or restore the information in revised pages as <br />may be appropriate. <br />Item 44. Rule 4.05.6(10). The Division found no certified as-built drawing for Pond 9-P1 in the <br />Permit. Information on page 22 of Exhibit 18 is that the embankment (constructed) height is 10 <br />feet, and the pond volume (at the crest of the emergency spillway?) is 6.fi acre feet (close <br />agreement with the 6.71 acre feet as determined on page 89 of Exhibit 1 f.). Please furnish an as- <br />built (certified) drawing of the impoundment. In this regazd, the Division expects to find (as <br />applicable) on as-bunts the following information (all essential to evaluate compliance with the <br />Rules): a plan view (preferably 2-foot contours, standazd plan size, horizontal scale to match) of <br />the embankment and basin; the location of the spillways (emergency, primary, combined); <br />location of inlet(s) and dischazges; exit and approach channels; profiles of spillways; height, <br />diameter, invert elevation and composition of risers; diameter, slopes, ertd elevations and <br />composition of barrels; trash racks; for emergency spillways the invert (crest) elevation, cross- <br />sectionview, bottom width, top width, depth, size & depth of riptap, slope of bottom; details of <br />pond draining devices; exit channels (controlling) bottom width, top width, side slopes, location, <br />depth, armor, bottom slopes; cross-sections of typical embankment showing in- and out-slopes, <br />top of embankment elevations, elevation of original channel under the centerline of the <br />embankment, and elevations of the toe and heel at the channel trace, embankment materials, <br />coverings, filter beds, drain blankets, etc.; [he relationships (elevations) of the top of <br />embankment, invert of the emergency spillway, and invert of the primary spillway; a stage <br />(elevation) -storage (capacity) curve*, and a stage (elevation) -water s~.uface area curve*. <br />(*may be provided in a SEDCAD+ demonstration) If available, include the specifications <br />