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Mark Culver, PE January 17, 2019 City of Roseville Page 12 Figure 10. Proposed Modifications at County Road C2 In addition to the above geometric changes, corridor signal timing adjustments at Lydia Avenue, County Road C2 and County Road C are also proposed. Our Streetlight analysis showed that about 22% of the NB traffic south of County Road C desires to tum right or left. Knowing this, it may be helpful to the overall network to modify some of the timing splits at County Road C to take advantage of some additional storage on Snelling between County Road C and County Road C2. The SimTraffic modeling indicates it is possible to improve overall network throughput and significantly reduce delays on the cross streets with some minor adjustments. The construction cost estimate for changes at Lydia Avenue is $50,000. For changes at County Road C2, the estimate is $250,000. These costs include minor timing adjustments needed. Scenario 2 Scenario 2 includes the geometric changes identified in Scenario 1 but with the construction of an additional 12 -foot wide northbound through lane on Snelling Avenue from County Road B2 to 1,180 feet north of Lydia Avenue. For this evaluation, we assumed the recommendation by SRF to begin the third lane at County Road B2 as proposed on the east side of the northbound roadway, but then transition to the west side of the roadway north of County Road C to utilize the center median area for the additional lane. The construction cost estimate for Scenario 2 with a worst-case scenario of requiring 6900 feet of noise wall is $7,798,650. For cost benefit calculations we also developed a cost estimate for construction without noise walls of $2,816,250. It is expected that some wall will be required but this was intended to provide the range of costs. Costs include signal retiming