10-23-2002 Council Agenda - Laserfiche WebLink

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Honorable Chairman and Planning Commission October 4, 2002 Page Four 6. Details of the outlet structures should be submitted showing rim elevations, weir size (if any) orifice elevations and sizes, pipe outlet inverts and sizes. 7. Pond slopes (X:1) should be labeled on the grading plan. 8. Overflow swales should be provided within easements from the cul -de -sac and from the intersection with McMenemy Street to the ponds to insure runoff events that exceed the storm sewer system capacity flow to the intended ponding locations. General Comments: 1. All Williams Pipeline easements need to be shown on all sheets. As indicated previously, the public street right -of -way that is to be granted must lie outside the Williams Pipeline easement. 2. It should be noted the developer and the developers contractor will be required to provide construction details and obtain approval of all construction methods to ensure compliance with all construction procedures and practices of the City of Little Canada, the St. Paul Water Utility, and Williams Pipeline and the Minnesota Office of Pipeline Safety. 3. It appears that the developer is proposing to construct a home near Viking Drive. A driveway access onto Viking Drive would be very close to the intersection; therefore we feel the driveway should access Preserve Trail. 4. City Council is discussing adoption of a pipeline safety policy requiring an additional setback from all pipelines 6" inches in diameter and greater in an attempt to provide increased safety for the possible future residents of "The Preserve" and other residents of Little Canada. The adoption of such a policy could affect the proposed development layout. To further protect future residents and the environment, mainly the wetland to the north, we will be requesting that a berm /containment area be constructed adjacent to /within the Williams pipeline easement to help prevent the pipeline contents from flowing onto the street and into the storm sewer where it would have a direct route to the wetland to the north if a break were to occur. We have contacted Williams Pipeline to determine the timeframe that would exist between a break and shutdown of the pipeline along with the anticipated volume of material that would be released to help in the design of the berm. At this time no information has been received from Williams Pipeline. Ltr 10 -04 -02 PingCom.doc