SCOPE OF WORK The City of Park Ridge has identified two undeveloped alleys within the City to be paved as Green Alleys. The two alleys selected are: • The alley from S. Washington Avenue to Harrison Street between Belle Plaine Avenue and Columbia Avenue – approximately 640 feet in length • The alley from Harrison Street to Canfield Road between Belle Plaine Avenue and Columbia Avenue – approximately 640 feet in length See attached location maps. The residents bordering the selected alleys will be a part of a Special Service Area (SSA) in which they will participate in the project on a 50/50 basis with the City. Because of this, the Engineer’s Estimate of Probable Cost will need to be broken down by alley. Due to impervious clay throughout most of the City, it is anticipated that the alleys will require a perforated discharge pipe to the local combined sewer system triggering involvement and permitting with MWRD. An example of the typical cross section Park Ridge is anticipating is attached to this request for proposal. SUMMARY OF WORK Page 2 The Scope of Work shall include, but is not limited to the following tasks: 1. Topographic Survey A detailed topographic survey of the right of way including: • centerline • all storm, sanitary and water structures including rim and invert elevations • garage finish floor elevations at garage door corners • structures in or adjacent to the alley right-of-way (fences, utility poles, walkways, etc.) 2. Soil Investigation The Consultant shall perform soil sampling and analysis to confirm the project qualifies for an LPC662 form. A geotechnical subsurface investigation program consisting of a series of borings along the proposed alley routes shall be completed. The soil samples shall be analyzed for soil gradation and material classification, moisture content, resistance to penetration, and unconfined compressive strength. Water levels shall be measured while drilling and immediately following completion of the borings. Infiltration tests shall be performed to determine permeability of the soil and its effect on design for storm water infiltration.
