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•. • -2- • <br />:~ <br />issued (#CO-0029947) for discharge of mine permit by the <br />Water Quality Control Division of the Colorado Department of <br />Health. <br />The estimated water requirements for the Logan Wash pro- <br />ject are less than 10 acre feet per year and average approximately <br />4-5 gpm with peak use of approximately 50 gpm. This need usually <br />is met by groundwater encountered in the mining operation, for <br />which the Applicant has water rights and recycled retort water, <br />but in dry years as was 1977, this need is augmented by the purchase <br />of water from the Town of DeBeque or from other s with senior water <br />rights in the area. <br />Being a small development operation, there will not be a <br />measurable, material injury to any senior water rights in the <br />Logan Wash area. <br />WATER QUALITY <br />Surface Water Quality: <br />Six continuously flowing or intermittent streams which might <br />be affected by Occidental's Logan Wash in-situ operations were <br />sampled once each month starting in April, 1975, and continued <br />through May, 1976. Thereafter, a quarterly schedule has been <br />followed. Coors Spectro Chemical Laboratory in Denver, Colorado <br />was selected to analyze the water samples collected. Originally <br />66 constituents were sampled as required by the then current EPA <br />standards for water pollution. Subsequently, the number of <br />constituents sampled was reduced to 39. Results are on file <br />at Occidental's Grand Junction office, where they may be examined. <br />Sub-surface Water Quality: <br />Six alluvial wells are being monitored for level and quality. <br />