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Task 7 - Spillway Repair and Clean-out of Pond 15-P20 and Removal of Associated Ditch Pond <br />15-P20. <br />Work Description <br />Starting at the Ditch discharge into pond 15-P20, the ditch shall be removed (filled) for a <br />distance of 350 feet north, and graded to original contour. Revegetation shall be according <br />to specifications in 20.0 Revegetation, attached. <br />The emergency spillway of Pond 15-P20 shall be lowered one (1) foot and graded to <br />accommodate additional riprap (total riprap thickness of 2 feet). Riprap material for the <br />spillway must consist of durable, irregular rock having a minimum D-50 of 6 inches and D-max <br />of 9 inches (See Drawing #3 ). Riprap will have to be imported. The sediment delta in pond <br />15-P20 shall be removed, and the resulting material incorporated into the area to be reclaimed <br />at Pond 15-P10. <br />Measurement and Payment <br />There will be no measurement for Task #7. Payment for Task #7 will be reflected in a lump <br />sum bid under Item #8 on the Bid Schedule. <br />Task #8 - Spillway Removal Pond 22-P4. <br />Work Description <br />The emergency spillway shall be removed from Pond 22-P4, allowing free flow around the <br />embankment. Care must be taken to not disturb portions of the embankment where <br />vegetation is well established. Additionally a 10-foot section of Ditch 22-1310, shall be <br />removed, and flow directed into Pond 22-P4. <br />Measurement and Payment <br />There will be no measurement for Task #8. Payment for Task #8 will be reflected in a lump <br />sum bid under Item #8 on the Bid Schedule. <br />Task 9 - Ditch and Gully Repair <br />Work Description <br />Approximately 100 feet of the failed ditch to Pond 15-P8 shall be removed (filled) and graded <br />to original contour. The large adjacent gully resulting from this failure shall be repaired by <br />creating a gentle swale 3 feet deep containing two feet of riprap. The riprap material must <br />consist of durable irregular rock having a minimum D-50 of 6 inches and a D-max of 9 inches. <br />Riprap will have to be imported and must be approved by the Project Manager prior to hauling <br />to the site. <br />Measurement and Payment <br />There will be no measurement for Task #9. Payment for Task #9 will be reflected in a lump <br />sum under item #9 on the Bid Schedule. <br />9