08/02/2006 Env Bd Packet - Laserfiche WebLink

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• • • AGENDA ITEM 5B STAFF ORIGINATOR: Marty Asleson DATE: August 2, 2006 TOPIC: Golden Acre BACKGROUND: This is a preliminary plat proposal for a rezone, variance for lot size /width /depth. This is almost an identical proposal to the adjacent Haley Manor Plat that was reviewed in 2003. Golden Acre has a total acreage of 1.11 acres. The existing zoning is R -1 Residential. The Developer wishes to subdivide to 4 lots. The project is located in Mar Don Acres, North of Lois Lane and South of Arlo Lane (Attachment 1, 2, 3). As with Haley Manor, there are no significant pre- existing land covers on site, nor are there any pre- existing soil -water relationships that would indicate rare plant features. There are no National heritage Consideration and no existing wetlands. Although the site is not large enough for the RCWD to review, recommend following standard guidelines for addition of impervious. That is an infiltration area must be provided to infiltrate the impervious area from the Mpls -St. Paul median storm (.34 inches) in 72 hours. This area could be in the form of a rain garden between the 4 houses with as much impervious area as possible directed to it. The infiltration area must be protected from compaction before construction begins. The grading plan shows the surface water flowing to the neighbor lot. The grading plan should be changed to reflect on site storage /infiltration of water. A SWPPP (Storm Water Pollution Prevention Plan) and a MPCA permit are required for this project. The SWPPP must be submitted to the City for approval before any soil disturbance occurs, as well as the MPCA permit. The SWPPP must be located on site (Preferably a mail box) with weekly and post rain fall event inspection reports. The developer did submit an erosion control plan (Attachment 4). The erosion plan should be made more comprehensive to address pollution issues such as concrete truck cleaning and litter containment. The plan needs to show a concrete truck wash site that is protected by containment barriers. All wash out must be removed from the site after construction. The plan signature is the responsible person that will inspect and correct deficiencies. The name and 24 hour phone number of this person must be added to the plan. Location of the required rock entrance must be shown on the plan. Storm sewer catch basins need to be protected with an Infrashield type of device. Silt fabric will not be allowed. Much of the language in the Erosion Control Notes are template /cut and past sentences with little thought on specifics or site realities. For instance, the notes