Agenda - Council - 05/11/2004 - Laserfiche WebLink

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Funding Sources 2003-4 CIP Elmcrest Park Parking Lot 2004 CIP Elmcrest Park Trail along TH 47 2004 CIP Quicksilver Extension to Elmcrest Park Oak Park District Balance Park Fund 50% Balance Total $ 400,000 $ 78,000 $ 221,800 $120,483 $ 73O,259 $1,550,542 Construction costs for this park will be higher than normal projects in the city due to the nature of the soils on the site. The soils exploration program found clay soils across most of the site. The recommendation from the geotechnical engineer included excavation and removal of 12" of the clay then placement of a geotextile fabric and 12 inches of sand under the pavement section. This work adds approximately 30% to the cost of construction. Staff has reviewed the project and identified three phasing alternatives that would allow construction to start without using all of the available funds. A sketch showing the extent of work for the each phase is attached. The alternatives are labeled Budget, Moderate and All. The cover sheet and overall plan sheet are included with the packet. Full plans are available at city hall for review. Budget: This includes the main driveway across the park to 163rd Lane, the street connection to the north to Quicksilver Street, the east parking lot and associated trails and a trail connection through the south east corner of the park to 160th Lane. All of the storm sewer will be installed as part of this phase. The estimated cost for this work is $584,200. This will provide 180 parking stalls. Moderate: This adds the southwest parking lot and trails to the Budget proposal. The estimated cost for this work is $766,700. This will provide an additional 120 parking stalls. All: This proposes doing all of the work and will provide 400 parking stalls. Phasing provides an opportunity to build the project with available funds. Potential drawbacks to phasing the work are the cost of additional mobilizations and the risk of substantial price increases. Staff has reviewed the cost of bituminous pavement in the street program over the last 5 years. The price has increased 7% over that time. Staff also compared the price of pavement material between projects with large and small quantities. A clear correlation could not be determined but the trend was for larger quantities of work to be bid at a lower unit price. Inflation has not been factored into any of the information provided herein. The soils engineers opinion and the cost estimates are conservative and plan for worst case conditions. The need for sand and geotextile would be evaluated in the field and would only be used where necessary. The trails also have sand and geotextile base