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t `r MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST 15. TRANSPORTATIONITRAFFIC 2010 without the project. The traffic impacts on 1-205 could potentially be mitigated with regional improvements, but the impacts on 1-580 west of I- 205 north of 1-205 would be unavoidable. 3) Intersection improvements at Mountain House Parkway and Grant Line Road would be required to accommodate project traffic. 4) Improvements would be needed at several County and other roads, including portions of Grant Line Road, Mountain House Parkway, Byron Road,Altamont Pass Road, Eleventh Street, SR 4,and Tracy Boulevard leading to SR 4. 5) Adequately sized internal roadways would be required to accommodate a substantial amount of internal traffic. 6) The Master Plan project would generate a significant demand for parking. However, adequate parking supply would be provided based on the - parking ordinance. _ 7) The Master Plan project would increase the demand for bicycle travel within the project site as well as between the site and adjacent developed areas. 8) The project would increase the number of vehicles crossing the existing Southern Pacific railroad tracks that run through the site.4 Findings Related to Significant Impacts Identified in 1994 MEIR The following mitigation measures were adopted to mitigate the above impacts. However,the 1994 MEIR concluded that the level of service for regional roadways, including certain locations at 1-205 and 1-580,would remain k unacceptable, resulting in a significant and unavoidable impact. Mitioation Measure M4.12-1: This measure addressed the need for 1)a Transportation Systems Management(TSM) program, 2)a Transportation Management Association (TMA), 3) local transit service,4) increased proximity of residential and commercial uses as a Master Plan policy, 5) flexible work programs/hours to reduce peak hour travel, G)Transit Oriented _t Development(TOD)guidelines for neighborhood centers as Master Plan IIh policy, 7)community contributions to an Altamont Station study and development for rail use,8)an annual Transportation Monitoring Program to allow revisions to transportation mitigation measures, and 9) a new implementation measure for the Master Plan addressing need for a telecommuting center within Mountain House. The findings for the 1994 MEIR did not address this specific mitigation _ measure. The Master Plan does address 1)a monitoring program,2) contributions to the Altamont Station, 3) promotion of telecommuting, and 4) F1�'j a Transportation Demand Management(TDM)program. A TDM program was prepared for Mountain House in 1997. The TDM program is to be 4 These railroad tracks are now owned by Union Pacific Railroad(UPRR). P �smi i I L + 5-171 II I