Agenda - Council - 08/24/1993 - Laserfiche WebLink

Home

I I I I ! I I I i I I I I I I I I I SCOPE AND INTRODUCTION The purpose of this study is to determine the feasibility of providing bituminous surfacing for 177th Avenue N.W. from St. Francis Boulevard N.W. to its Eastern terminus, a distance of 1,227 feet. The project will benefit eight (8) properties having frontage along the aforementioned segment of roadway which is located in the eastern half of Section 2. The project area is illustrated and benefitted properties are identified in Exhibit 1. EXISTING CONDITIONS The present street consists of a four inch thick Class V surface 32 feet in width. The road was reconstructed to the above described section in the Summer of 1991 and should need only minor grading prior to the placement of the bituminous surfacing. The existing gravel surface is generally in the center of the 66 foot right-of-way; however, the road centerline may be up to four feet south of the right-of-way centerline for the westernmost 600 feet of the roadway. There is a well defined drainage ditch along the entire south side of the roadway. However, along the north side of the roadway, no ditch exists for the westernmost 600 feet of the road segment. This road was constructed in this manner to lessen the impact a ditch would have on the front yards of the three residences located within the western 600 feet of the roadway segment. To facilitate drainage, the roadway was constructed with a two percent (2%) southward transverse slope across the entire 32 foot gravel roadway for this westernmost 600 feet. Drainage is channeled from the ditches to a designated drainage easement located within a nature low area located approximately 180 feet north of the roadway. PROPOSED IMPROVEMENTS Since the drainage and horizontal alignment of the existing Class V surface is generally adequate, it is recommended that a thirty (30) foot bituminous mat be placed directly on the existing road surface following preparatory grading, rolling and tacking. It is further recommended that a four inch (4") bituminous curb be placed on the northern side of the street for the westernmost 600 feet. This will serve to help reinforce the vulnerable edge of the pavement. Placement of curbing on the remainder of the project is not being recommended as it would require a substantial amount of fill behind the curbing, and adjacent land use in these areas will not generate heavy traffic along the pavement edge. The areas behind the curb will be filled with topsoil, seeded and mulched. Pavement of drives behind the curbline will not be paved as a portion of this work. ESTIMATED PROJECT COSTS The estimated project costs are presented in Table 1 and shall be comprised of construction costs as detailed herein and overhead costs. Overhead costs include, but are not limited to, engineering, construction staking and inspection, fiscal, legal, _administrative and contingencies. Overhead costs for the project are estimated based upon percentages of construction cost. These percentages are estimated to be as follows: Engineering Staking and Inspection Bonding and Legal City Staff Administration Contingencies 10% 7% '3% 5% 5%