12/16/1985 Meeting (2) - Laserfiche WebLink

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q ; M E M 0 RAN DUM e December 13, 1985 TO: Mayor and City Council FROM: Departments of Public Works and Planning SUBJECT: EVALUATION OF 6TH-7TH EXTENSION ALTERNATIVES FROM HIGHWAY 99 TO SENECA At the Council's work session on December 4, you requested that we compare several alternatives to the recommended Alternative One alignment at the east end of the project. The following discussion summarizes the results of our analysis, and the attached table shows in a matrix format how each alternative ranks with the others based on the evaluation criteria that we used. General Discussion of Alternatives This analysis compared the following four alternatives: e (1) Alternative One, at grade, as described in the draft Environ- mental Impact Statement. (2) Alternative One, with the section between Highway 99 and Conger Street on an elevated structure. (3) Using 5th and 7th as a one-way couplet from Highway 99 to just west of Seneca, where they would then be merged into the Alternative One route to the west. (4) A "5th Avenue" alternative, consisting of a new limited-access roadway running generally parallel to 5th Avenue. The four alternatives are shown on the enclosed map. The 5th-7th couplet and the 5th Avenue Alternative were studied previously by State and City staff and the Citizens Advisory Committee. For various reasons, they were rejected for further study in the EIS, along with several other preliminary proposals. (See pages 5 and 6, and Figure 3, in the draft EIS). Discussion of Evaluation Criteria To aid in comparing these alternatives, we selected a number of criteria that we feel represent the primary issues the Council must consider in weighing the pros and cons of each proposal. (A) Traffic Flow: We used a computer model to simulate traffic e flow for the year 1996, which is used in the EIS as the basis for traffic projections. The model gives an estimate of total