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1 Joe Samuel explained the impervious surfaces. Approximately 30% of the Langton Lake � shoreland management area (within 300 feet of the shore) is impervious. In the proposed � master plan development, the impervious surface is reduced to 23%. Chair Mulder asked � what the entire site master plan impervious area was (78% existing vs. proposed at 70%). 5 �� As requested on October 6,2004, Michael Noonan explained what the development � might look like from the park. Tim Whitten, Rottlund Architect, explained the setback � view of the senior buildings in the background and townhomes to the west, behind the � trees in Langton Lake Park. L �r I1 I� L3 L� I� I �� I" I$ I� �� ,� i �� ?� ?� �; �� �F �� �� ��1 31 �� x� �� �� ��, �� �g Michael Noonan explained the "round-about" idea which originated with the public works staff and Utilities/Public Works Commission. The "round-about" can be an effective traffic management tool. Duane Schwartz, Public Works Director, explained four reasons for use of "round-abouts": safety, efficiency, no additional maintenance, better aesthetics and costs. Steve Wilson, the city's traff'ic engineer, noted that 20,000 trips are generated by the new Phase 1 proposal. The peaks are 10% (2,000 trips) of the total. He gave examples of peak traffic for four types of uses: 800 trips peak hour Big Box 600 trips peak hour Support Retail 200 trips peak hour Off'ice 400 trips peak hour Residential In Phase 2 additional traff'ic could add 1,500 trips in peak times. Chair Mulder asked if the peaks are at different times for different uses. Steve Wilson explained traff'ic distribution: 20% to north 35W and 15% to south 35W. Chair Mulder closed the staff/consultant question and ar_swer portion of the meeting. Robert Rouda, 946 Lydia Drive, asked if bike and bus or other mass transit might be used in relation to the site. (Bike and pedestrian areas are in the Plan). What trolley could be used? On another issue, are the trees deciduous? (Yes) What would be the view in winter? �� Meg Rattei, 3063 Mt. Ridge Road, asked for details of new 7050 rules effective in 2005 �� and the impacts on the site. They regulate non-source point pollution and the water �] quality o f the lake. She explained phosphorous, clarity and development impacts. The �? lake does not meet those roles. The PCA will evaluate the lake to determine impairment �� from non-source point pollution. The PCA can establish a development moratorium on �1 the lake's watershed. The Planning Commission should do a TMDL study; it should be �5 done to monitor and clean the lake. Ponds do not take out soluble phosphorous. Water �b can be treated by infiltration or use of alum. Page 4 of 12 � � �