03/26/2003 Env Bd Packet - Laserfiche WebLink

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does not convey to the Lake Protection Zone. A good deal of it at least historically went into the zone 1 and 2 areas to the SE. The proposed pond on the SE side of the development appears to be dug into the traditional seasonally high water table. Engineers should confirm post development seasonally high water levels under this pond. Engineers should confirm there is adequate (3 to 4 feet) of separation between the bottom of the pond and the post - development seasonally high water table. Separation is important in order to adequately address concerns of ground water pollution potential in the sensitive soils of this area. Well protection to the SE, and the degradation of the ecosystem are environmental concerns for the ground water. It is now speculated that stagnant water pond areas that maintain depths of around 2 to 3 feet, for more than a couple of weeks, are likely breeding sites for West Nile mosquitoes. If water levels in the SE pond will be maintained at 2 to 3 foot levels in normal conditions, than the developer should submit a program or plan that ensures long -term treatment of this pond. Preliminary Tree Save Area (Attachment 6) indicated on the plan shows a proposed area of about an acre and one half of Oak forest to be preserved. This area can be an excellent infiltration site if existing surface water is maintained through this area. This area has had had oak wilt infection in the past. Control measures have been taken. Control measures to prevent and control disease should be part of the Tree Preservation Plan. Disease control is enforced through the Tree Disease Ordinance. Public access into the preserved woodland and the infiltration area on the North and South side of the woodland should be planned for in order to maintain these systems. Once the tree inventory is modified to include all significant trees, a Tree Preservation Plan should be submitted, approved by staff, and implemented, before soil disturbance. Permanent Conservation Easements are proposed for this site. Please see (Attachment 7). This development has a lot of potential to save trees and manage water resources. Keep in mind, that once an accurate Tree Inventory and Preservation Plan is developed, it is quite possible to see many more trees left in the landscape. No soils should be imported or exported to this site without City approval. Topsoil removed from the site for grading reasons should be used on the site. Soils in designated open -space preservation areas should be protected from compaction. Infiltration areas should be shaped with low- compaction equipment and protected from further compaction. Attempts to maintain pre- existing soil