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Page 2 Paul Dunn October 27, 1989 The third segment of this storm sewer improvement involves bringing the water from the west side of Snelling Avenue to the new pond on the east. The existing 24-inch pipe is not large enough to convey all of the water flowing in the 42-inch pipe mentioned above. We would either need to jack a new pipe under Snelling Avenue to provide the additional capacity or store the excess water on the west side of Snelling Avenue and discharge it to the east at a reduced rate through the existing 24-inch pipe. In order to store the water, additional storm water ponds would need to be built on the west side of Snelling. The cost of jacking a 42-inch pipe under Snelling Avenue would be approximately $52,500. The cost of building necessary ponding would be considerably less but may infringe on parkland adjacent to Snelling Avenue. To be safe, we should plan on spending the $52,500 to install a new pipe. Again, because this portion of the system only serves your water, its costs should be your responsibility. Finally, you will be assessed a fair proportion of the cost of the existing trunk sewer into which your water will flow. The original estimate, which we discussed, of $49,638 was based on a storm sewer project which provided both trunk sewer and a local conveyance system to a large number of properties in your immediate area. First of all, it seems reasonable to subtract the interest charge or $22,602, because you have not been using this improvement for the past 19 years. Because 44% of the cost of the project for which you are being assessed was for lateral sewer extensions, and because your project does not benefit from an existing lateral system, it is reasonable to charge only for the trunk sewer portion of the existing system. Therefore, the remaining $27,036 can be reduced to $15,140. This amount must be paid before a building permit can be issued and cannot be added to your storm sewer assessment. In summary, your cost for storm sewer is estimated to be $68,100 + $49,800 + $52*500 - `>170,400, which can be assessed, plus $15,140 for back assc4 -ynnts which must be paid up front before a building permit is issuud. Please contact me at 490-2221 if I can answer any more questions or provide additional information. Sincerely, ZJ- P. -�/ - Karl P. Keel Assistant Public works Director KPK:cy cc: Craig Waldron, Director of Community Development