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<br />White•iver Nahcolite M~nerals <br />Febnuay 3, 1998 <br />Mr. John Mehlhoff, Area Manager <br />White River Resource Area <br />Bureau of Land Management <br />P.O. Box 928 <br />Meeker, CO 81641 <br />Mr. John Carson <br />Environmental Protection Agency <br />Mail Code 8ENF-T <br />999 18th Street, Suite 500 <br />Denver, CO 80202-2466 <br />Subject: Request To Revise Monitoring Plan, Specifically Hydrology Section <br />Dear Mr. Mehllioff and Nlr. Carson: <br />Based on eight years of hydrologic monitoring of the White River Nahcolite Minerals <br />(WRN) Site, WRN reque;sts approval to modify the water level and quality suppling <br />program. WRN data indicates that project affects will be detected first by water level or <br />potentiometric changes. Water quality changes are a secondary reaction following <br />water level chu~ges. Water quality effects have taken months to be detected, but <br />drilling, mi(ung or dewata;riug affects have been noted on the water levels (esp. <br />Dissolution Surface aquifer) on a hourly or daily basis. The wells near mining activities <br />are the only wells (EX-2 and water we1190-1) which have shown mining affects. <br />Therefore, modification of the hydrology monitoring section is based on ui expanded <br />water level monitoring program and a reduction in water quality sampling frequency of <br />remote.monitoring wells. Recently completed monitoring wells BG-1 and DS-2 will be <br />monitored for water quality (field and lab) montlily and provide additional water quality <br />and level data close to the mini~ig operation. <br />.Whits'Rivsr Nwhcolits:Mlner~l~,~L1~nlt~d.Llablllty Company <br />P. O. DnJrer 72, 3200 Co. ~Rd. 37, BIOS; CO 87850' ~,(leq 970,878.3874 (fez) 970-878-5800 <br />- e . '.. . <br />