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.~ ` <br />DEPARTMENT OF NA'711RAL RESOURCE~MM v III III III IIIIIII III <br />D. Monte Pasco e, Executive Dirrclor 999 <br />]Vi1NH:U L:~NU 1{1~.(:L/~IVIA'I'IUN <br />423 Centennial Budding, 1313 Sherman Street <br />Denver, Colorado 80203 Tel. (303) 839-3567 <br />David C. Shelton <br />Director <br />August 29, 1981 <br />TO: Brian Munson <br />FROM: Dave Craig i11~,/ <br />f " <br />R£: Comments on H-G's Hydrology Monitoring Plan <br />I have reviewed the overburden geochemistry and hydrology portions of H-G's <br />permanent program submittal. As a result of this review, i propose that the <br />following stipulations be added to the mining permit: <br />1. Within 90 days of permit issuance, a surface water monitoring site <br />should be located upstream of all mining disturbance in both Hayden and <br />Dowden Gulches. These monitoring sites should be used for both water <br />quality sampling and flow measurements. H-G should consult the Division <br />prior to construction to specify exact locations of the sites. <br />2. After permit issuance, hydrology monitoring at the H-G mine site <br />should be conducted as follows: <br />a. Ground Water <br />1) !dater levels in all monitor wells should be measured semi-annually. <br />2) Water quality samples should be <br />annually. These samples should be <br />meters specified below. <br />b. Surface Water <br />taken from all monitor welts semi- <br />chemically analyzed For the para- <br />1) Flow measurements should be taken at all surface water monitoring <br />sites twice a year as follows: <br />a) Once during spring snowmelt <br />b) Once during a storm event <br />Z) Water samples should be taken from all surface water monitoring <br />sites at the same time and frequency as the flow measurements. These <br />samples should be chemically analyzed for the parameters specified <br />below. <br />