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the Special Purpose Plan identified transportation improvements for two separate development scenarios. Transportation improvements were identified for "short-term cumulative buildout" of industrial projects in the area and for"longer-term cumulative buildout." A Memorandum of Understanding(MOU)was executed between San Joaquin County and Caltrans, District 10. The MOU required that a Project Study Report (PSR) be prepared to identify the appropriate near-term transportation improvements needed to mitigate traffic impacts to I-205 and I-580 due to construction of the Safeway warehouse and the other initial Patterson Pass Business projects. The MOU states that a second PSR would be prepared at a later date to identify the long- term(20-year)improvements required to serve cumulative growth in the area. The MOU also states that the second PSR could be triggered by additional industrial growth or other significant projects in the area, such as the proposed Mountain House New Town. A PSR was completed and approved by Caltrans in 1992 for the short-term transportation improvements (Figure 7). Following completion of the PSR, a Project Report was approved by - Caltrans.The PSR and Project Report identified the need to reconstruct all four freeway on-and off- ramps at the I-580/Mountain House Parkway interchange. Reconstruction of the ramps was required to upgrade the ramp structural sections to serve the heavy truck traffic and to provide the turning radii necessary for the trucks.In addition,Caltrans required the developers to construct a 1,600-foot auxiliary lane on the I-205 eastbound freeway at the Mountain House Parkway interchange to mitigate the impacts of increased truck traffic merging into congested mainline traffic during the PM peak hours. The improvements have been completed. Additional improvements to Caltrans facilities would be required to serve longer-term cumulative growth in the Mountain House Parkway/Schulte Road area. Both the Mountain House Parkway/I- 580 and I-205 interchanges would need to be upgraded for heavy truck traffic and the existing two- lane overpasses would require widening to four or six lanes. 1996 Traffic Counts Korve Engineering collected traffic counts at the ramps to the Patterson Pass Road/I-580 and Patterson Pass Road/I-205 interchanges in November, 1996 to determine current traffic levels at that time. Morning and evening peak hour traffic counts were collected at five intersections: • the I-580 southbound ramps at Mountain House Parkway; • the I-580 northbound ramps at Mountain House Parkway; • the Mountain House Parkway/Schulte Road intersection; • the I-205 eastbound ramps at Mountain House Parkway; and • the I-205 westbound ramps at Mountain House Parkway. Using the traffic count data,existing level-of-service conditions were analyzed at each intersection, based on the methodology of the Transportation Research Board.Each of the five intersections was found to be currently operating at Level of Service (LOS) A. LOS A is indicative of light traffic conditions with low levels of vehicular delay. 93231•B0.spp00.wpd•224/00 -10-