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Alternative 3: Improve Drainage Between Culvert #1 and Wetland #656 <br /> <br />M ajar Elements/Co,sis <br /> <br />Lower Culvert #1 ................... $ 7,500 <br />Clear fallen trees and obstructing vegetation from .... 1.200 <br /> existing swale <br /> <br />Remove fill placed in drainage-way on Welsh property <br /> <br />$8,700 <br /> <br />Disadvantages <br /> <br />No outlet from Wetland #656 <br />Flooding potential of Wetland #656 could be slightly increased due to better <br /> drainage into it <br /> <br />Alternative 4: <br /> <br />Install Storm Sewer down 156th Lane N.W. Between <br />Culvert #1 and Culvert #2 <br /> <br />Major Elements/Cosls <br /> <br />Install 1,350 feet concrete pipe manholes and discharge <br />Replace roadway ................... <br />De-watering required ................. <br /> <br />Advanta_oes <br /> <br />· No permits or property acquisition required. <br /> <br />Disadvantages <br /> <br />· Does not provide an outlet for Wetland #656 <br /> <br />$42,900 <br /> 22,900 <br />13,000 <br />$78,800 <br /> <br />Alternative 5: <br /> <br />Construct Pond to Accommodate Runoff Generated from <br />Paving 156th Lane N.W. <br /> <br />Major Elements/Costs <br /> <br />Excavation and spoil removal ............. <br />Side slope restoration ................. <br />Clearing and grubbing ................ <br /> <br />Easement acquisition (10,000 sq. ft., 1 property owner) <br /> <br />$5,500 <br /> 2,000 <br />1.500 <br />$9,000 <br /> <br />Disadvantages <br /> <br />Does not provide an outlet for Wetland #656 <br /> <br />Benefits <br /> <br />Provides wetland banking for future construction projects which require <br /> wetland filling <br /> <br /> <br />