Agenda - Council - 06/26/1990 - Laserfiche WebLink

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Hakanson Anderson Assoc.,Inc. April 19, 1990 Mr. Mark Banwart City of Ramsey 15153 Nowthen Blvd. N.W. Ramsey, MN 55303 Re: Vertical Control System for the City of Ramsey Dear Mr. Banwart: I have reviewed the status of the benchmark system in the City of Ramsey and have estimated the cost to upgrade the system as follows: Item 1. The latest records show that the City now has 304 benchmarks that have been set and verified at different times since 1983. It is very probable that some of these benchmarks may have been disturbed or removed since they were set, however, the system is not very old and the elevations were measured to accuracies required for a Municipal Vertical Control System. It is my opinion that the existing system is in reasonably good condition. If it would be necessary to rerun the level network through the 304 existing benchmarks, balance the network and catalog the data, the cost would be approximately $14,000.00. Item 2. There are many platted areas and other areas within the City where benchmarks are very sparse or do not exist at all. It is important that the City expand on its existing benchmark system to include all platted areas. I estimate the cost to establish benchmarks in the platted areas where there are none at approximately $8,500.00. Item 3. A system of 50 permanent benchmarks, set to Mn/DOT standards, could be established throughout the City. These would consist of 3/4" sectional alu~inLunrod driven to refusal and capped with a 3-1/2" diameter friction cap with a City of Ramsey benchmark designation. The aluminu~ rod comes in 3 foot lengths that are threaded and are screwed together as they are driven into the ground. Refusal is driving less than 1 foot per minute using a 70 pound air hammer - usually about 20 feet deep in sandy soils. The cost to purchase material for 50 monuments from Bernsten Monument Company ~s as follows: , ZZZ Monroe Street Anoka, Minnesota 55303 612/427-5860 Fax 612/427-3401