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Task 3 - Section 15 Stream Realignment <br /> This task requires the furnishing of all labor and equipment necessary to excavate and <br /> establish a new stream channel for an unnamed stream emptying into Del Augua Creek in the <br /> extreme south center of Section 15. <br /> Work Description <br /> Approximately four hundred feet of new stream channel will be excavated through surficial <br /> clay, silt, and unconsolidated sediment containing occasional coal, and other imported rock. <br /> Bedrock is believed to be between five and ten feet below the surface, and consists of silt <br /> stone and sandstone with a notable absence of gravel normal to stream laid deposits. <br /> Bedrock may or may not be encountered during excavation. The new channel will be twenty <br /> feet in width at the bottom with a high berm on the.northwest side (see Drawing #1). Excess <br /> material from channel construction shall be used in construction of the berms, and/or disposed <br /> of in the Pond 15-P10 removal, and regrading or embankment construction for Pond 22-P10. <br /> Slight meanders will be constructed to slow the flow of water and allow development of a <br /> normal stream channel (see Map #4). <br /> A mine haulage road will cross the realigned channel by a riprapped low water crossing. This <br /> portion of the task requires excavating the road, plus ten 0 0) feet on each side of the road, <br /> a depth of two (2) feet below stream channel grade and replacing with two feet of riprap (see <br /> Map #4). Riprap material for the road crossing must consist of durable irregular rock have a <br /> minimum D -50 of 6 inches and D-max of 9 inches. Riprap will have to be imported and must <br /> be approved by Project Manager prior to hauling to the site. Channel configuration, and limits <br /> will be staked by DMG personnel. The portion of the haul road below the riprapped crossing <br /> shall be re-graded to eliminate a large erosion gully. The width and grade of the road shall not <br /> be changed. <br /> Measurement and Payment <br /> There will be no measurement for payment for Task #3. Payment for Task #3 will be <br /> reflected in a lump sum bid under Item 3 on the Bid Schedule. <br /> Task 4 - Pond 15-P10 Removal <br /> The purpose of this task is to completely remove Pond 15-P10 which was not included in the <br /> mine permit as a permanent pond. <br /> Work Description <br /> The east, south and west embankments of Pond 15-P10 shall be removed and incorporated <br /> into the north side of the inslope. The resulting new slope shall be graded to approximate <br /> original contour. Revegetation shall be according to specifications in 20.0 Revegetation, <br /> attached, and will be paid for under Item 13. <br /> Measurement and Payment <br /> There will be no measurement for payment for Task #4. Payment for Task #4 will be <br /> reflected in a lump sum bid under Item 4 on the Bid Schedule. <br /> 7 <br /> u <br />