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• ~II ~I~~I~II~II~~~I~ <br />999 <br />MINED LAND RECLAMATION DIVISION <br />Department of Na[ural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />303 8663567 <br />FA%.303 832-8106 <br />GATE: March 28, 1990 <br />T0: Dan Hernandez <br />FROM: John T. Doerfer ~~ <br />RE: Review of Sediment Pond Design, Corrective Action Plan, <br />Snyder Quarry, Castle Concrete Company, File No. M-77-210 <br />of ~O~o <br />~"_.~> <br />Ne, ,. <br />~' ~~~~'. <br />~ r8]6 ~ <br />Roy Romer, <br />Governor <br />Fretl R. Banta, <br />Division Director <br />I have reviewed the design of the sediment pond submitted by Castle Concrete <br />Company on January 31, 1990. This pond is located below the visual berm near <br />the entrance to the Snyder Quarry. The design was submitted in reslanse to a <br />requirement placed upon approval of the corrective action plan for ~ibatement <br />of the violation on off-site damage due to rock slides near the acc6~ss road. <br />The design was carefully prepared and follows the original design principles <br />established for the Phase III area sediment pond, My comments follcx+ing <br />review are provided below: <br />1. On page 3 the statement is made that material excavated from tF~e ponds <br />will be transported to the quarry for suitable disposal. As tFie ponds <br />will be excavated below existing grade, this material should bc~ handled <br />similar to overburden. Topsoil should be salvaged. What are i:he plans <br />for topsoil handling and where will the topsoil stockpile be located? <br />2. No discussion was provided on reclamation of the pond area. Ar•e the two <br />ponds planned as temporary or permanent structures? If tempor~~ry, what <br />is the final grading, drainage, stabilization and revegetation plan? If <br />permanent, what is the intended use and continuing maintenance plan? <br />3. The runoff calculations were developed based on a drainage are~~ of <br />6.8 acres from sub basins A and B. The sediment load calculations were <br />based on a total area of 5.03 acres (1.98 acres for the visual berm plus <br />3.05 acres active mining area). Why do the two areas not correspond? <br />4. In order to verify that the ponds constructed in the field correspond to <br />the designs approved, the Division requests that as-built drawings or a <br />narrative statement of confirmation that ponds were constructed as <br />designed be submitted within 60 days of the completion of pond <br />construction. <br />5. The Division requests that the volume of sediment removed during <br />clean-out operations oe estimated and reported in the annual report. <br />/ern <br />cc: Bruce Humphries <br />Steve Renner <br />5549E <br />STATE OF COLORADO <br />