2004-09-10_REVISION - M1977036 (2)

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~LAFARG E ,~ NORTH AMERICA Construction Materials September 9, 2004 Mr. Thomas Schreiner Colorado Division of Minerals & Geology RECE9VE® SEP 10 2004 -/ Division of Minrrals and Geology -i-~_ ~ 1313 Sherman St., Room 215 Denver, CO 80203 ~ RE: 35th Aven~Pit, MLRB Permit No. M-1977-036 Technical Revision Mr. Schreiner, Per your compliance letter of August 9, 2004, Lafarge West, Inc. (Lafazge) is requesting a Technical Revision (TR) to our permit for the 35`" Avenue Pit located in Greeley, Colorado in Weld County. The TR is in response to the Division's request for a weed control plan for tamarisk including control methods to be implemented and a schedule for the when the various control methods will be employed. Lafazge is proposing use of the herbicides Arsenal and Habitat to control the tamarisk. Habitat will be used in areas where spray will come in contact with water; it is approved for use in and around standing and flowing water. The spraying will occur before the end of September, as the herbicides aze foliaz applications and only effective while the plant has green leaves. Future applications, if necessary, will occur during the late summer and/or eazly fall. For cost effectiveness, the infected azeas will be aerially sprayed via helicopter. The aerial spray will be supplemented by hand spraying in azeas of small or isolated infestation, and areas neighboring desired vegetation. Lafarge has successfully treated other sites with the proposed actions and believes the TR meets the Division's requests. Should you have any questions or need additional information, please do not hesitate to contact me at 303-657-4421. Best regards, Suzanne Ja n ].and Specialist LAFARGE NORTH AMERICA INC. -Lafarge Construction Materials 1400 West 64~' Avenue, Denver, Coloratlo 80221 Telephone: (303) 657-0000 Facsimile: (303) 657-4037