Agenda - Council - 08/22/1989 - Laserfiche WebLink

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19. Pbv£ical A/tera./c: cf ~etlan~ The proposed road alignment crosses two protected wetlands ~57W and ilgY. The total area of wetlands impacted by this alignment is approximately 2.3 acres. It is intended tc n. inimize the impact on the wetlands and associated wildlife by avoiding construction in the wetlands during the prime nesting period. The City is assessing the possibilities of scheduling construction through the wetland areas over la~e winter 1990. The majority of the construction over the remainder of the prcject is scheduled to commence in May. if such a schedule cannot be accomplished, the work within the wetland areas can occur after nesting seasoL. %:ne wetlands are dr]' with no water currently at the surface. The depth of organic soils in the easterly wetland (ii4P) is estimated to be approximately 2-3' The depth of peat in 675W is estimated to be approximately the same. The amount of excavation for the roadbed itself is estimated to be 6700 CY from l14P and approximately 1600 CY from 657W. Preliminary design efforts will look at the possibility of using geotextile fabric and surcharging the peat rather than excavating all peat areas. Peat which is excavated will be used to enhance another wetland basin or be stockpiled, drained, and used as a soil modifier in topsoils. The contractor will be required to comply with an erosion and sediment control plan which will minimize the disturbance to the adjoining wetland areas. At a minimum, the Contractor will be required to adhere to a "least damage" schedule, install silt fence and barriers to control spillage and erosion from nhe project area, and reestablish ground cover as soon as practicable after grading. ~ere peat is excavated and stockpiled, temporary dikes will be created to control sediment laden runoff from entering into surface waters. viii