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r <br /> 01 <br /> HONEYWOOv ^c ` . .,.-r__ -_ <br /> SEDIMENT PONDS "A" AND "B" CERTIFICATION <br /> In accordance with Rule 4. 05.6(10) , each sediment pond 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 L. K. 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 29% 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 of 8.07 AF. The as-built capacity of Pond B is as <br /> follows: <br /> POND B CAPACITY - ACRE FEET <br /> Water Sediment Total <br /> 8.07 0.55 8.62 <br /> 4�p0 REGIS7* <br /> amesStov—Ihp �� -`4, Date <br /> Colorado Profe�?s onal Engl�bgr <br /> Registration V*;-71919230 a <br /> CERT-ALB o eo .r� <br /> ,0:�3.'oaa.aaaasr�fOd <br /> oalUtYAi. c�' <br /> ..dAg <br />