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• III IIIIIIIIIIIII III • <br />999 <br />Eryviroq-geryt, Iqc. <br />LARRY E. O~BRIAN <br />-RltIDlMT <br />November 6, 1986 <br />[~,r. James B. AicArdle <br />Pdined Land Reclamation Division <br />1313 Sherman Street, Room 423 <br />Denver, CO 80203 <br />Re: Harley Pit I, [dLRB file ~ Id-86-147 <br />Adequacy response. <br />Dear b1r. McArdle: <br />9989 WEST 80TH AVENUE <br />ARVADA COLORA00 80004 <br />3b3-423-7287 <br />~~~~~ ~~~ <br />NOV 1 1g83 <br />RECi ti p TtO~ Dl~ SI~rJ <br />On behalf of our client Sterling Ready-tdix Concrete, Company Inc. <br />we will address your letter of November 3, 1986 to correspond with <br />the numbering system you used: <br />Exhibit B - Mining Plan. <br />1) From my site inspection it appears the available topsoil <br />averages 2 inches or less. This is a terrace deposit of <br />Rocky Flats Alluvium and is covered by lenses of topsoil, ie <br />the topsoil is not evenly dispersed over the site. The best <br />figure I can give you is 2,600 cubic yards. <br />2) That is correct, however i need to stress that this is not <br />topsoil/growth medium. Its purpose is to provide a root zone <br />of revegetation. <br />a. It will come from material left in the pit after mining is <br />complete. It may be material from the floor of the pit ie <br />ripped shale or will be derived from the material being sloped. <br />b. No stockpiling will be necessary as it is in-situ material. <br />c. There will be no need for stockpiles of this material. <br />d. This procedure was recommended by the SCS at Sterlings Ptertens <br />Pit II operation which is very similar to the pit. <br />3) we agree to this once the stockpiles are established and will <br />not be disturbed for extended periods of time ie 6 months or <br />longer. <br />4) This is correct however we disagree with your assessment that <br />benching in a sand and gravel operation is inappropriate. <br />Are 40 foot gravel high walls safe? We think not. It may not <br />have been clear that the benches are intended to allow mining <br />of two grades of material. The upper strata of the pit is a <br />dirty sand and gravel, it contains some clay and binder material <br />