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• III IIIIIIIIIIIII III • <br />Portland Plant <br />3500 Hwy. 120 <br />P.O. Box 349 <br />Florence. Coloratlo 81226 <br />719/7846325 <br />Fax 719/784-3470 <br />~HOLNAM INC <br />June 26. 1991 ;-: <br />Mr. Bruce Humphries lUL l 2 199' <br />Minerals Program Supervisor, <br />Mined Land Reclamation Division, "June:; ~.,,, <br />Department of Natural keaources ~+~' 'c,mat:r;r lw~G~„ <br />1313 Sheraan St. Room 215 <br />Denver, CO 30203 <br />RE: Portland Limestone Quarry <br />Pel•mit No. M-77-344 <br />Test of Controlling Fugitive Riln Dust with Sewer Sludge. <br />Dear Mr. Humphries, <br />This is an interim 1•eport as promised in the April 29. 1991 <br />request for a technical revision pertaining to spraying newer <br />sludge on fugitive cement kiln dust at the Portland Quarry. <br />The placeme:lt of cement kiln dust in the backfill and spreading <br />of sludge fo:• fertilization of reclaimed areas are both included <br />as Technical Revisiotts to the Mining Permit fur the Pol•tland <br />Limestone Ruarry. <br />Th? initial test guidelines were <br />problems relative to r_otltrolling <br />spray distribution of sewer sludge. <br />to investigate procedures and <br />fugitive cement kiln dust by <br />The Fremon± Sanitation District leased a pump and apray equipment <br />similar to a "Rainbird Rain Cannon" for the test. The following <br />observations were noted. <br />1. The large orifice sprinkler did spread the sludge over <br />the dust in a uniform appli~:ation. <br />2. T}le sprinkler reversing mechanism deposited large amounts <br />of sewer sludge on the d:•iving surface next, to the pump, <br />craatins 1 m~_ss arnind the pump and no~.:le. <br />,4. The Lew dump height of this tes*, site re~luir~d excessive <br />mc~intensn.e, both in manpower and ~q~.iipmant. <br />