10-23-2002 Council Agenda - Laserfiche WebLink

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Honorable Chairman and Planning Commission October 4, 2002 Page Two Site Plan: 1. The numbering of Lots 1 & 2 in Block 2 are reversed on the preliminary plat when compared to the site plan. Grading, Drainage, & Erosion Control Plan: 1. No grading information is shown for Preserve Court from McMenemy Street to approximately 115 feet east of McMenemy Street. The grading plan should address this area. 2. The access roads for maintenance of the proposed storm water ponds should be shown and addressed on the grading plan. All storm sewer structures and pipe should also be shown on the grading plan. 3. Spot elevations should be shown at all street intersection radius points to determine drainage patterns around street corners. 4. Emergency overflows and elevations should be shown for all low points and ponds. The elevation of the wetland should also be noted on the plan. 5. The 100 -yr high water level should be indicated for each storm water pond. 6. Boulevard grades appear to be as steep as 1:1 (H:V) starting directly behind the curb. A 5 -foot boulevard should be graded behind the curb at 2% and we suggest that after the 5 -foot boulevard a maximum of a 3:1 slope be used to allow for maintenance of the areas. 7. The current grading plan shows only 3 lots with building areas higher than the elevation of the street. Of these 3 lots, one is in excess of 8 feet higher than the street. All remaining lots have building areas lower than the street and the grade difference across the buildable area of some lots is 18 feet. These factors will make it difficult to construct a house on these lots without impacting the drainage to adjacent lots. Therefore we are requiring that the grading plan show the first floor elevation and garage floor elevation of every lot. In addition, the grading plan will need to address the grading of each individual lot to demonstrate that the stormwater runoff from every lot can be conveyed within each lot and its surrounding drainage and utility easements without affecting the adjacent lots. 8. The street grade on Perserve Court directly east of Preserve Trail is at 10 %. It would be beneficial to lessen this grade especially since it is sloping toward the dead end cul -de- sac. However, site limitations may make this impossible. Utility Plan: 1. No HDPE storm sewer pipe will be allowed under the street, however it may be used behind the curb. 2. The watermain is shown directly under the storm sewer mainline. Either the storm sewer or watermain should be moved to allow repair of the watermain without impacting the storm sewer. Ltr 10 -04 -02 PingCom.doc