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Approach and Methodology <br />The travel demand model requires land use and demographic data input at the appropriate zone level for <br />all rune Bay Area counties_ For the purpose of land use data collection, the nine Bay Area counties will <br />be divided into the following regional auras_ <br />Region 1_ Tri-Valley area <br />Region 2. The remainder of Contra Costa County <br />Region 3. The remainder of Alameda County <br />Region 4. Other seven Bay Area counties <br />Region 5. San Joaquin County_ <br />The data. inputs for the zones within Regions 1, 2, and 3 consist of the following variables: <br />1. Number of Households <br />2. Household Population <br />3. Employed Residents <br />4. Household Income (expressed in 1979 or 1980 �) <br />5. Retail Employment <br />6. Service Employment <br />7. Other Employment <br />8. Total Zonal Acres <br />9. Diablo Valley And Contra Costa College Enrollment <br />10. Alameda County Model data requirements. <br />For the areas external to Regions 1, 2, and 3, only the total number of jobs and households for each traffic <br />zone will be prepared. The zonal structure in areas outside Regions 1, 2, and 3 are at a greatly aggregated <br />level that shall -only require household and employment variable in order to produce travel forecasts. <br />Economic and Planning Systems (EPS), as a subconsultant to Barton-Aschman, with participation of <br />Alameda County and Contra Costa County staff and the Tri-Valley jurisdictions, shall create the data base <br />system containing detailed existing and future land use assumptions for all the traffic zones within Contra <br />Costa County and the Alameda County- portion of the Tri-Valley area for the years 1990, 2000, and 2010. <br />With this data base system, land use and demographic data files for Regions 1 and 2 will be created to <br />be used as the input for the trip generation model- <br />EPS contribution to the land use and demographic input refinement will consist of the following effort <br />Improvement/modification of the existing computer data base system. <br />EPS shall use data base management programs used for the Contra Costa County <br />General Plan as the building block for this application_ Modifications shall be <br />Cooperative Agreement No. 45.01.00 Exhibit A <br />Between Contra Costa Transportation Authority and Page 4 of 13 <br />County of Alameda, Pleasanton, Dublin, and Livdrmore <br />