#20 - Bridgewater Village Final Plat

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May 6, 2024 City of Lake Elmo Page 5 of 8 Reference: Bridgewater Village Planning Commission, Engineering, Fire, Landscape Architecture, and Washington County comments received from The City of Lake Elmo storage length at unsignalized intersections should be based on the number of turning vehicles likely to arrive in an average two-minute period during the peak hour. Using the trip generation information provided for this project, the following calculations were made: • Stillwater Boulevard/Linora Avenue – The greatest total trips entering the intersection occurs during the p.m. peak hour, with 180 trips. Based on the trip generation information, 100 trips are southbound on Linora Avenue at Stillwater Boulevard. These trips are split into 50 left turns and 50 right turns during the p.m. peak hour based on the expected trip distribution. This equates to 1.67 vehicles in a two-minute period (50/60 * 2) for both the right turn and left turn movements. Rounding up to 2.0 vehicles and using 25 feet per vehicle results in a storage length of 50 feet. • Stillwater Way/Linora Avenue – The greatest total trips entering the intersection occurs during the p.m. peak hour, with 70 trips. Based on the trip generation information, 40 trips are northbound on Linora Avenue at Stillwater Way. These trips are split into 20 left turns and 20 right turns during the p.m. peak hour based on the expected trip distribution. This equates to 0.67 vehicles in a two-minute period (20/60 * 2) for both the right turn and left turn movements. Rounding up to 1.0 vehicle and using 25 feet per vehicle results in a storage length of 25 feet. • As shown in the site geometrics plan, the northbound right turn lane on Linora Avenue at Stillwater Way is 70 feet and the southbound right turn lane at Stillwater Boulevard is 100 feet. Based on the calculations shown above, both turn lane lengths are adequate. 6. Wet pond safety and maintenance and benches a. Bridgewater Village site construction plan review dated 04/10/2024, item 99, states that the pond cross section shall be redesigned to address safety issues with 3:1 slope during drawdown. b. The proposed pond design has a 10’ safety bench and a 10’ maintenance bench at the normal water level (NWL) of the pond with a designed 3:1 slope below the NWL to pond bottom. At time of drawdown of the pond for irrigation reuse, there will be approximately 4’ of fall / exposed side slope below the NWL past the safety bench. c. Proposed design solution: The project team recognizes the safety concern in the even that someone falls down the pond embankment, across the 20’ width of the maintenance and safety bench, and down the 3:1 slope to the drawdown water elevation. To mitigate this, a 4’ tall ornamental fence can be installed around the rim of the pond with a gate access for maintenance. The fence would minimize the risk of children or impaired individuals falling into the pond. Expansion