Agenda - Council - 07/14/2020 - Laserfiche WebLink

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CC Regular Session 5. 9. Meeting Date: 07/14/2020 By: Bruce Westby, Engineering/Public Works Information Title Adopt Resolution #20-142 Authorizing Requests for Quotes to Relocate Sand Stockpiled on The COR Infiltration Basin site to Municipal Plaza Park Purpose/Background: Purpose: The purpose of this case is to adopt Resolution #20-142 authorizing Requests for Quotes to relocate the sand stockpiled on The COR Infiltration Basin site to the Municipal Plaza park site. Background: The COR Infiltration Basin Improvements produced approximately 8,000 cubic yards of excess sand, which is stockpiled north of the infiltration basins. Plans to relocate this sand stockpile to the Municipal Plaza park property located north of Sunwood Drive and west of Center Street have been discussed with the Public Works Committee. The consensus of the Committee is to use this sand for filling Municipal Plaza park as soon as practical. Final plans for The COR Infiltration Basin Improvements determined that 35,000 cubic yards of excess sand would be generated. Less than half the excess sand was to be used to fill in two low-lying City -owned properties in The COR including the property east of Zeolite Street between Veteran's Drive and Sunwood Drive, and the Municipal Plaza park property. The remaining sand was to be stockpiled on City -owned property to the north. Excess sand was never placed on the Municipal Plaza park property due to two issues that arose early in the project. First, an unmarked fiber optic line needed to be relocated, which delayed construction for a few weeks. Second, a deep topsoil vein was discovered which further delayed construction and reduced the volume of excavated sand. The delays in construction and reduction of excess sand resulted in a decision to haul and place the excess sand on the property east of Zeolite Street first. There simply was not enough time to establish new turf on the Municipal Plaza park property to ensure it could handle the heavy foot and vehicle traffic generated by the Happy Days festival, including all of the site preparation activities that occur a week or two before the festival itself. Upon completion of The COR Infiltration Basin Improvements, Staff surveyed the excess sand that was stockpiled on the City -owned property north of the basins and found the volume to be just under 8,000 cubic yards. Based on grading plans completed by Bolton and Menk, approximately 8,000 cubic yards will be needed to fill the Municipal Plaza park property. The work required to relocate the sand stockpile to the Municipal Plaza park property includes installing erosion control measures (silt fence) on the Municipal Plaza property before stripping the existing topsoil to expose the underlying granular base material and stockpiling the topsoil on the adjacent City -owned property to the west. The base material must then be tested, compacted and documented. The stockpiled sand can then be hauled to the Municipal Plaza park, where it must be dumped, leveled and compacted in specified lifts. The stockpiled topsoil must then be spread evenly across the compacted sand, after which it must be seeded and mulched. Lastly, the original sand stockpile site north of the infiltration basins must be leveled before topsoil is spread and seed and mulch applied. Attached is a figure showing the Municipal Plaza park property that will be filled with the excess sand. Though the figure includes cross sections showing an undulating surface, Staff plans to grade the site with a flat surface that will