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I I <br />The following information is provided in response to the July 13, 1981 <br />letter from Brian E. Munson, Reclamation Specialist, regarding Ithe Hayden <br />. _ Gulch Mine Permit Application. <br />REVIEW QUESTION <br />ease gustify the use of 100 lb/ft3 as the weight of sediment since <br />normal soils generally have densities averaging 70 lb/ft3. A11so, in the <br />1979 technical revision, 55.3 lb/ft3 was used as the standard! weight of <br />sediment. What is the reason for the discrepancy? <br />RESPONSE '~ <br />A weight of 100 lb/cu.ft. was based on experience in Florida <br />where it has been used successfully. However, assuming a sedi- <br />ment weight of 70 lb/cu.ft. will still yield an adequately sized <br />pond. <br />The design of the ponds west of County Road 53 was perform2d in <br />1979. The assumed sediment weight was used to provide a consgrva- <br />• tive pond size. <br /> <br />M130 <br /> <br />eiLrnfa~.a4..~-.W~xYl ~l-•~c - NYMi®1]L.: aYaY~ ~~ l` ~N ~A:tt~}1F~ iR~l'~.l..i. :36.~:a.12u .. ~li nj'l iii ~.'~. "J_:~.~~.~.ati~[Y1. ~ - u~4 y'R: <br />