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The traffic study analyzed the weekday a.m. and p.m. peak hour LOS traffic for the following three scenarios: • Existing -This scenario evaluates the existing traffic conditions. • Existing Plus Approved Projects -This scenario includes the existing traffic plus traffic from approved but not yet built/completed projects. • Existing Plus Approved Projects Plus the Proposed Project -This scenario includes the existing traffic, plus traffic from approved but not yet built/completed projects, plus traffic from the proposed project. The proposed 110-unit detached single-family homes for residents aged 55 years and older would generate approximately 587 daily trips on an average weekday, including a total of 30 AM peak hour trips (11 trips inbound and 19 trips outbound) and 53 PM peak hour trips (32 inbound and 21 trips outbound). Seven intersections were analyzed in the traffic study based on the number of trips that the project adds to the intersections and the existing level of service (LOS) at the intersections. All seven of the study intersections currently operate at LOS "D" or better. Adding traffic from the approved but not builbcompleted projects will result in one intersection not meeting the LOS "D" or better standard: • Valley Avenue at Santa Rita Road -LOS "E" in the PM peak hour Adding the traffic from the proposed project to the approved projects will not result in any additional intersections exceeding the LOS "D" or better standard. The project would add a very small overall average delay of 1.6 seconds to the Valley Avenue/Santa Rita Road intersection, resulting in no change to the LOS at this intersection in both the AM and PM peak hours. The construction of a third southbound left-turn lane at this intersection will allow it to operate at LOS D in the PM peak hour. The City is also exploring other mitigations for this intersection. The mitigation at this intersection is considered to be a Citywide responsibility. Therefore, the project's payment of the City and Tri-Valley Traffic Impact Fees is considered to be its mitigation of this improvement. Staff notes that the proposed project would generate considerably less traffic than the 1,000- student high school that was previously assumed for this site. The high school would have generated approximately 1,160 AM peak hour trips and approximately 100 PM peak hour trips (as noted above, the proposed project would generate approximately 30 AM peak hour trips and 53 PM peak hour trips). PUD-74 Page - 9 - June 25, 2008