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Year 2020 Addendum ADT Automotive Traffic Study . contributing roughly nine percent of the total cost of improving study area roadways to met Year 2020 conditions. If the project were to install the Berkeley Road/Mountain House Parkway signal at a cost of $150,000, the $129,000 expenditure in excess of the fair share contribution for that . location should offset other impact fees payable by the Project. This reduction could be implemented either by reduction of the initial fees paid by the project, or by reimbursement to the Project as other projects pay into the improvement fund. Any such arrangement would require a negotiated agreement between the Project sponsor and the County. 5.0 CONCLUSIONS This study has evaluated the potential transportation impacts of the proposed ADT auto auction facility for the year 2020. The Project was evaluated in terms of its projected effects on the six study area intersections. The analysis results showed that all six intersections would fail to meet County standards of operation for the projected year 2020 traffic volumes without the Project. The standard is LOS D or better for all study area intersections. Addition of Project generated traffic would exacerbate conditions at study intersections already operating unacceptably. Therefore, mitigation measures would be required to offset the cumulative impacts and the Project would be required to contribute a fair share of the costs of these improvements. The fair share percentage of improvement costs is defined to be the same as the percentage of cumu'•ative traffic which is generated by the Project. In particular, the following improvements would be needed with fair share contributions as indicated: • 1-580 Eastbound Ramps/Patterson Pass Road Intersection — Add a traffic signal, a northbound right turn lane, and an eastbound right turn lane. Estimated cost: 5300,000/Project Fair Share Contribution: $18,000. • 1-580 Westbound Ramps/Patterson Pass Road Intersection — Add a traffic signal. Estimated cost: 5300,000/Project Fair Share Contribution: $27,000. • Schulte Road/Mountain House Parkway Intersection — Improve traffic signal to include overlap right turn phasing. Estimated cost: S50,000/Project Fair Share Contribution: $3,000. • At the Berkeley Road/Mountain House Parkway intersection — Add a traffic signal. Estimated cost: 5150,000/Project Fair Share Contribution: $21,000. • 1-205 Eastbound Ramps/Mountain House Parkway Intersection —Add a traffic signal and a northbound right turn lane. Estimated cost: $300,000/Project Fair Share Contribution: $39,000. • 1-205 Westbound Ramps/Mountain House Parkway Intersection — Add a traffic signal. Estimated cost: $300,000/Project Fair Share Contribution: $24,000. • Mountain House Parkway from Schulte Road to 1-205 eastbound Ramps—Widen to four lanes. Estimated cost: $900,000/Project Fair Share Contribution: $99,000. • Schulte Road east of Mountain House Parkway— Widen to six lanes. Estimated cost: $792,000/Project Fair Share Contribution: $3,960. • Bridge over Delta Mendota Canal—Construct two additional bridge lanes for a total width of four lanes. Estimated cost: $864,000/Project Fair Share Contribution: $120,960. As listed above and summarized in Table 5, the Project's fair share contribution towards the required mitigation measures would be$355,920 of the $3,956,000 total cost of the improvements. Thus, the Project would be contributing roughly nine percent of the total cost of improving study , area roadways to met Year 2020 conditions. Korve Engineering,Inc. 13 Ju1y2000