03-08-2004 Council Packet - Laserfiche WebLink

Home Browse Search

8. Both lots will gain access to Watertown Road via a shared driveway in proposed Outlot A. Lot 2 shall not have no separate access to Watertown Road. 9.The property contains a creek which flows through an extensive wetland system upstream of the propeity. The Orono Surface Water Management Plan indicates that the Normal Water Level for the large wetland basin just to the north of the property is elevation 963.S', with the High Water Level (100-year flood level) at elevation 970.4*. The top of the bank of the channel at the constriction area in Lot 1 is at approximate elevation 968.0*. and closely matches the delineated wetland boundary. Per the recommendation of the City Engineer, the OHWL for setback and lot area calculation purposes for the property should be established at the wetland boundary elevation of 968*. The proposed driveway crossing will include a culvert which has been sized to meet all anticipated stormwater demands. However, to ensure that no upsucam homes are flooded if the culvert plugs, the City Engineer has indicated the top surface of the driveway crossing should be lowered from elevation 973.0* to 972* to allow for an open channel overflow that will be 2* lower than the lowest floor of the upstream residences (974* min.). The culvert should be an arch RCP to allow this reduction in hei^t The RFPE, i.e. the minimum floor elevation for any building, should be established at elevation 974*. In proposed Lot 1. based on the topography and site plan submitted by the applicant, neither the buildable area nor the septic sites will be impacted by floodplain and OHWL elevations. 10. The creek driveway crossing will require filling within floodplain as well as within the wetland. A number of variances are required to allow the creek crossing. The specific issues with the driveway which require variances are: a) Portions will be within 75* of the OHWL of the creek where no hardcover or grading is allowed except by variance per Section 78-1286; b) Portions will be within a delineated wetland or w'ithin 26* of the wetland, where no grading or filling is normally allowed. Grading and filling in or near a wetland, and crossing of the creek, are also subject to WCA regulations administered for Orono by the MinnehiUia Creek Watershed District. Page 3 of 9