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Street <br />The proposed street design will use a B618 barrier curb and gutter on the streets. <br />Exhibit 3 shows the existing and proposed street section for these streets. This type of <br />curb will be used throughout the project in conjunction with storm sewer. Concrete curb <br />will provide delineation between the street and the boulevard. There are a number of <br />long -term advantages to constructing concrete curb and gutter including ensuring the <br />roadway edges are strengthened and reinforced, keeping the horizontal alignment and <br />vertical elevations for the street fixed during paving, channeling street drainage into <br />catch basin structures or rainwater gardens, preventing water from entering under the <br />pavement edge, and keeping snow plows within the delineated street limits. Future <br />pavement management operations are simplified, less expensive and less disruptive by <br />having a concrete curb constructed with this project. <br />For the most part, street widths will remain relatively unchanged. If Keller Parkway <br />requires reconstruction due to utility placement, the existing street section would be <br />replicated with an aggregate shoulder. Average existing street widths and proposed <br />street widths for each street within the project area is tabulated below. <br />Street <br />Length <br />(feet) <br />Average Existing Width <br />(feet) <br />Proposed Width <br />(feet) <br />Beam Avenue <br />500 <br />29.9 <br />30.0 <br />Kohlman Court <br />230 <br />31.1 <br />30.0 <br />Kohlman Lane <br />1960 <br />29,8 <br />30.0 <br />Linden Lane <br />350 <br />20.3 <br />20.0 <br />Meadowlark Lane <br />340 <br />28.9 <br />30.0 <br />The proposed street section will genera ly consist of 8- inches of aggregate base topped <br />with a 3.5 -inch layer of bituminous. In areas of poor subgrade materials as identified in <br />the geotechnical report, the subgrade will be excavated 2 -feet and replaced with a <br />select granular material. The Braun geotechnical report has identified poor subgrade <br />materials consisting of glacial till composed of sandy lean clay with moisture contents <br />around 19 %, which exceeds the optimum moisture content for this soil type. The <br />existing subgrade soils provide poor support for pavements and are frost susceptible. A <br />consideration for a 2 -foot sand subcut is mentioned in the Braun geotechnical <br />evaluation report along with installing drain -tile at low points. The cost estimate in this <br />feasibility report reflects a full 2 -foot subcut for all streets and replacement with select <br />granular material in order to provide the needed support for the proposed pavement <br />section. <br />4 <br />14 <br />