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®~ Banks and Gesso, LLC <br />~® <br />August 1, 2003 <br />Ms. Erica S. Crosby <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver. Colorado 80203 <br />720 Kipling St.,Suite117 <br />Lakewood, Colorado 80215 <br />(303)274-4277 <br />Fax (303) 274-8329 <br />www. banksandgesso. com <br />RE: Cemex, Inc.; Lyons Quarry, Permit No. M-1977-208 <br />Technical Revision 02; Response to 2"d Adequacy Letter <br />Dear Erica: <br />This letter is in response to your 2nd Adequacy Letter dated July 22, 2003 for the Lyons Quarry. The <br />questions in your letter were related to protection and maintenance of the Smead Ditch (owned by <br />Lafarge), as we had previously proposed piping the Smead underneath the concrete disposal cell. <br />Based on your comments, Cemex has decided to move the location of the proposed disposal cell so as <br />not to impact the Smead Ditch. <br />Please see the attached "On-Site Disposal Cell Map Revision 2" for the revised locations of the <br />proposed disposal cell and stormwater diversion ditch. The proposed cell is similar is size (-10 acres) <br />and volume to the previous cell, with a cumulative fill volume of almost 320,000 cubic yards. This <br />volume is more than adequate to dispose of the approximately 80,000 cubic yards of crushed concrete, <br />plus liner, earth fill (including interstitial fill added to each 3 foot debris lift) and topsoil. The source and <br />amount of these materials are as follows: <br /> Source i--------------------------------------, <br />Volume <br />3' Clay Liner j Purchased geosynthetic liner or clay ; 42,000 yd3 <br /> i from Dowe Flats quarry. <br />i ._--- - ----- <br />3' Clay Liner + ------ ----._._... ------- ------ <br />i Overburden from site or Dowe Flats - --_ _ _ _ _ <br />~ 42,000 yd3 <br />Protective Cover <br />I---- -----------.-_._---- ~ quarry. <br />--'-------....------- ------.-.-.-.-.-.-_----.__-.-.__-.....-._-..-.-_ ........ <br />..................._..._.-. <br />i Interstitial Fill ~ Overburden from site or Dowe Flats ~ 27,000 yd3 <br /> <br />i. ~ quarry. ~ <br />' <br />3' Cover Above ~ 30" overburden plus 40,00 yd3overburden + I <br />Rubble Pile ~ 6" topsoil from site or Dowe Flats ~ 8,000 yd3topsoil ~ <br /> 1 quarry. j------_.-.-..-----__._..- --------._-.-.---......-----' <br />Please let me know if you require additional information to approve this Technical Revision. Thank you. <br />Sincerely, <br />~~~~ <br />Maureen Jacoby <br />cc: John Lohr, Cemex, Inc. <br />