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<br /> <br />C.J ~:-. . _ - _ _ <br />SEDIMENT PONDS "A" AND "B" CE~TIFIC~1'I'ION <br />Zn accordance with Rule 4.05.6(10), each sediment cond will be inspected <br />during construction under the supervision of, and certified after <br />construction by, a qualified registered professional engineer. This <br />certification is for the construction of Sediment Ponds A and B at the <br />Hamilton Mine both of which were constructed during April 1992. <br />The construction of the ponds was supervised by ~. Y, Jewkes, an EIT and <br />Colorado School of Mines graduate, who works under my supervision. Mr. <br />Jewkes has a wide variety of experience in the construction industry. <br />Pond A is located north of Mining Area No. 1. It was constructed in <br />accordance with the approved plan. The capacity of Pond A is slightly <br />larger than the design indicates because rock was not encountered in the <br />southern portion of the pond as anticipated. As a result, the southern <br />portion of Pond A is a slightly deeper than designed. The design of Pond <br />A is shown on drawing 117-A, revised 3-26-92. The design capacity of <br />Pond A is as follows: <br />POND A CAPACITY - ACRE FEET <br />Water Sediment Total <br />2.16 0.21 2.41 <br />Pond B is located east of Mining Area No. 1. It was constructed in <br />accordance with the approved plan. The sediment capacity of Pond B is <br />slightly less than the design indicates because rock was encountered in <br />the pond bottom. The three year sediment volume is calculated to be 0.77 <br />AF. The actual calculated sediment capacity of the as-built pond is 0.55 <br />AF. Pond B therefore has 2.1 years of sediment capacity (3 X 0.55/0.77). <br />Another way to evaluate the sediment capacity is to conclude that the <br />pond is 298 full of sediment ((0.77-0.55)/0.77] The result of the <br />reduced sediment capacity will be that the pond will require more <br />frequent sediment removal. The design of Pond B is shown on drawing 117 <br />B, dated 5-21-91. The Pond B as-built water capacity equals its design <br />water capacity cf 8.07 A°. The as-built capacity of Pond B is as <br />follows: <br />POND B CAPACITY - ACRE FEET <br />Water Sediment Total <br />0,07 0.55 8.62 <br />CLAT-Ai9 <br />oi~~~ <br />+oPOp REGIS. <br />/:~'James E. Stoves; ~~- ~G~ o; Date <br />Colorado Profe§'~onal Engipn9e~2= <br />Registration ~~;~l9a§~30 ; ~ <br />cv <br />o-a' ~~ s <br />e 9~,'. S <br />• •• ~ ~.~ <br />~~or~ <br />