01/31/2007 Env Bd Packet - Laserfiche WebLink

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Parking Lot Islands. The large parking lot shows a number of islands. Small islands do not afford desirable planting conditions for trees. Consideration should be given to combining areas of smaller islands into larger islands. Further consideration might be given to treating these areas with dropped curb, and slopes to the islands to filter parking lot runoff. These might be formal plantings with designed rain garden characteristics (would also include trees). Pond Areas. All surface water areas not formally planted, or exposed pond, infiltration or wetland areas should be planted with the City Native Seed mix.. All native planting areas should include an annual maintenance program to insure survivability. RECOMMENDATION: Staff recommends that the following modifications be forwarded to the Planning & Zoning board for consideration: 1. Invasive species within the existing wetland should be eradicated as part of the site development. 2. The site should be modified to incorporate the required 10 foot buffer around the wetland. 3. A fueling site spill containment area should be designed into the plan. 4. Importing of soil shall be subject to review and approval of the City Engineer. 5. Pond designs should incorporate the use of for -bays for pretreatment and ease of maintenance. 6. Evaluate use of infiltration bmp's to treat parking lot runoff. 7. Provide adequate vehicle access to pond and infiltration areas. 8. A storm water maintenance agreement be executed between the City and Developer which includes a maintenance schedule for native planting and rain garden areas 9. The SWPPP be modified to incorporate the comments included in the SWPPP memo 10. A tree preservation plan shall be submitted. 11. A revised landscaping plan shall be submitted in conformance with City requirements including screening plan for the west side of the property, rain garden planting schedules and irrigation. 12. The area of parking lot islands should be increased to improve planting conditions. 13. The City Native Seed mix shall be used in all surface water management and buffer areas that are not formally planted ATTACHMENTS: 1. Location 2. Certificate of Survey (Existing Conditions)