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STATE OF COLORADO <br />Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />DATE: July 22, 1987 <br />T0: Jeff Deckler <br />FROM: Candy Thompson ~l <br />RE: GRASSY GAP - FILE N0. C-81-039 - ANNUAL HYDROLOGIC REPORT <br />A review of the AHR identified the following problems. <br />1. The twice a year sampling, should coincide with at least two different <br />seasons. As winter access is difficult, I would suggest a June and' <br />October sampling. The June sampling could be done at the same time as the <br />spring and seep survey. <br />2. The spring and seep survey was done in October. Springs normally have <br />highest flow in the months of June and July and should be surveyed during <br />this time frame. <br />3. In May of 1987, the Division sampled the Pit 2 well. There was <br />approximately 1.5 feet of water in the well. The analysis results are <br />enclosed. The water in the well was very muddy. Filtering of the sample <br />prior to acidification is essential to obtain proper analysis results. <br />4. The June 30, 1986 sample results for Site 2 gives a TDS of 16,906 mg/1. <br />By calculation, the TDS is 683. The laboratory (ACZ) has been notified of <br />their error. <br />5. The analyses of the Pit #5 and #6 pond shows the water to be of relatively <br />high TDS ( 1000mg/1). The major constituent of the water is sulfate. <br />This is also true g~ the sites draining the undisturbed areas although the <br />concentrations ofj~and sulfate are much lower. During October 1986, SW-4, <br />the most downstream sample site, had a TDS of 1004 mg/1. This is higher <br />than previously noted at the site. In TR-2, the Division allowed the <br />reduction of surface water sampling to this one site during inactive <br />status. Due to the elevated level of TDS noted at this site, the Division <br />is of the opinion that site SW-3 should be sampled in the future on the <br />same date as SW-4 to give a comparison with a relatively undisturbed <br />site. The operator, i.~°in agreement, should file a revised technical <br />revision reinstating this site. If the operator disagrees, information <br />must be submitted to the Division to show why the comparison data is not <br />required. <br />/lal <br />1272E <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />