Laserfiche WebLink
<br />DA Permit No. CO 25B OXT 2 003589 <br />Siegrist Construction Co. :, <br />DETAILED DESCRIPTION OF AUTHORIZED WORK <br />In accordance with the terms and conditions of this permit, Siegrist Construction Co. <br />is authorized by the Secretary of the Army to place temporary and permanent fill <br />material in the St. Vrain Creek at mile 13.50E in conjunction with a mining operation <br />and a bank stabilization project located in Section 35, Township 3 North, Range 68 <br />West, Weld County, Colorado. <br />The work consists of constructing a temporary low level berm, mining the sand and <br />gravel deposits, providing riprap bank protection to the existing bankline, restoring <br />the mined area to pre-project contours, and removing the temporary low level berm. <br />The temporary low level berm will be approximately 800 feet in length, 3 feet high, <br />10 feet wide at the top with 1 on 1 side slopes and will require the placement of <br />an estimated 1,150 cubic yards of material. <br />After the berm has been constructed, the area landward of the berm will be mined for <br />sand and gravel. Once the sand and gravel have been removed, the area will be <br />filled, as near as practical, to the contours which existed prior to the mining <br />operation, utilizing stockpiled overburden materials. At this time, the high bank <br />will be restored to the same height, location and configuration that existed prior <br />to the mining operation. <br />The high bank will be graded to a 2'~-foot horizontal to 1-foot vertical slope. A <br />12-inch sand and gravel blanket will be placed along the prepared bankline and an <br />18 to 24-inch riprap blanket will be placed on the sand and gravel blanket. The <br />riprap will be placed in a 2-foot deep keyway at the toe of the slope and will be <br />keyed into the bankline at the upstream end a distance of about 10 feet at a 45 ' <br />degree angle. Approximately 600 cubic yards of either natural rock or broken <br />concrete will be utilized for the bank protection. If broken concrete is utilized, <br />it will be covered with an estimated 18 inches of soil and reestablished with vege- <br />tation indigenous to the area. In addition to the rock and/or broken concrete, <br />dead trees will be incorporated in the bank protective works. The trees will be <br />cabled to deadman anchors buried on shore above the ordinary high water line. <br />Upon completion of the bank protection, the low level berm will be removed in its <br />entirety. <br />6 <br /> <br />i <br />i <br />~I <br />