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proposed project to intercept surface water sheet flows, and storm water conveyance pipes within the De Anza Boulevard and Mountain House Parkway roadway corridors converying off-site sheet flow and intract runoff flows to and under Byron Road and discharging into an interim discharge channel/water quality basin prior to discharge further north into Mountain House Creek and onto Trimark-owned agricultural fields. Roads. Roadway improvements for the project are expected to be identified by way of conditions of approval for this application, and the specific improvements are envisioned to be built in phases according to levels of service and access requirements for each incremental phase of the subject subdivision. (Typical roadway cross-sections are provided in Appendix 11.) Actual improvements for the site are anticipated to be constructed either by the Mountain House Community Services District (MHCSD) via developers' payment of roadway impact fees, or by the applicant with fee credits being taken against actual improvements being constructed. The proposed improvements for project-related roads (see Figure 4) include the following: Mountain House Parkway. The Master Plan calls for Mountain House Parkway (north- south arterial) to be constructed ultimately to four lanes from Byron Road to Mascot Boulevard, six lanes from Mascot Boulevard to Von Sosten Road, and eight lanes from Von Sosten Road to 1-205 by the buildout of the entire community. However, the traffic study used by the applicant for the proposed project calls for initial phased construction of the two southbound lanes in the vicinity of the project. This road currently has one southbound and one northbound lane. The phasing would also include proper turning movements at first phase intersections, and transition lanes where the phased improvements revert to existing conditions along this road both north and south of the proposed project. In its assessment of the proposed project's impact on Mountain House Parkway, the Mountain House Neighborhood "F" Project Initial Study and Mitigated Negative Declaration, SCH #90020776 calls for improvements to the roadway to reduce impacts to less-than-significant levels. Required mitigation measures include the following: 1) Trimark funding of the Project Study Report (PSR) for the 1-205/Mountain House Parkway interchange, which includes an evaluation of the level of service within the interchange, prior to the approval of the first final map; 2) improvements consisting of a 250- to 500-foot four lane section, adequate to accommodate traffic volumes, on both the northbound and southbound approaches of Mountain House Parkway at Grant Line Road and at Mascot Boulevard; and 3) improvements consisting of two northbound, left- turn lanes on Mountain House Parkway at the intersection of Mascot Boulevard and Mountain House Parkway, and a southbound acceleration lane onto Mountain House Parkway located south of Mascot Boulevard. De Anza Boulevard. The Master Plan calls for the ultimate construction of four lanes on De Anza Boulevard (north-south arterial) to occur on a phased basis during community buildout. The traffic study prepared for the project calls for a minimum of two lanes between Mascot Boulevard and Mountain House Boulevard along the adjacent industrial and office commercial parcels for access considerations only. No warrants for any other through traffic considerations or other level of service considerations are called for during the buildout of this subdivision, according to the Optrans traffic study. Specific intersection improvements where De Anza connects to other project roadways may be appropriate based on traffic safety considerations. Mountain House Boulevard. The Master Plan calls for the ultimate construction of four lanes for this east-west arterial, occurring on a phased basis during community buildout. As phases of the subdivision progress, Mountain House Boulevard will ultimately be extended to Central Parkway. Specific intersection improvements where Mountain House Boulevard connects to other project roadways may be appropriate based on traffic safety considerations. -7-