08-27-2003 Additions - Laserfiche WebLink

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Hanson, Joel From: Clifton Aichinger [cliff ©rwmwd.org] Sent: Tuesday, August 26, 2003 2:51 PM To: joelhanson Cc: tina carstens Subject: The Preserve. Joel - Tina and I met with Pro Terra Design and Mark (Dayspring development) regarding the revision to the plan to address our three main concerns; wetland buffer setback, grading plans and the construction of the retaining walls, and erosion control plans. To my surprise, they did not have actual revised plans for our inspection. Instead, they discussed a concept that they would like to work on to meet the average buffer requirement. So, we do not have a revised set of plans that we can say actually meet our requirements. However, they did confirm that they would reduce the depth of the building pad areas if necessary to limit the disturbed areas and meet the buffer requirement. We did approve their concept of using areas behind the storm water ponds for buffer if they were undisturbed. We also discussed their plans for construction phasing and the construction of the retaining walls. Our concern was that the walls would be damaged during the construction of the homes and result in erosion into the buffer area. They discussed the phasing of construction and satisfied us that their process is reasonable. They would construct the walls with the initial grading of the site and not disturb the walls after construction. The final slopes from the units to the walls would not be completed till after the housing unit construction. The flat area between the walls and the unit would be used by the construction company during the construction of the unit. Final grading from the unit to the wall would be a final grading item. They will provide a narrative on the final plans to this effect. We asked for the addition of a compost bio log erosion control device at the top of each retaining wall after its construction and to be maintained until completion of the unit and final site restoration. One final item that we have also requested and not yet received, is the calculations of compliance with our stormwater pond construction standards. They have to show us they can comply with our sizing and treatment standards before we will approve the plans. ProTerra is proposing to change the shape of the ponds to be more linear and fit almost entirely into the buffer area (which actually results in more disturbance of the buffer). This way they have more area behind the pond to count for buffer area. This is a contortion of the District policy, but we don't have any way to not allow it. We would issue our permit if the following conditions were meet in a revised plan: 1. The project met our 75 foot average buffer requirement. 2. The ponds were designed to meet our water quality treatment standards and the proper hydrologic calculations were presented to and approved by the District. 3. The project erosion control plans and construction narrative were revised as discussed in our 8/25/03 meeting. ProTerra said they would try to get me the revised plans before your City Council meeting. If they do, I will call you with our review if possible. Give me a call if you need any additional information, Cliff Aichinger