04-12-1989 Council Agenda - Laserfiche WebLink

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.LASSOCIATES, IN :Consulting Engineers -tend Survwyor.., April 5, 1989 CITY COUNCIL CITY OF LITTLE CANADA 515 East Little Canada Road Little Canada, MN 55115 RE: STORM SHELTER, NORTH STAR PARK Dear Councilmembers: 500 West Highway 96 St. Paul, Minnesota 55126 484 -3301 We have gathered as much information as possible short of ordering soil borings at the proposed site. This information consists of borings taken by the City in the construction of South Owasso Boulevard and borings taken by John Vitale on the property adjacent to the mobile home park. These borings indicate that the peat becomes progressively deeper as you move north from Owasso Boulevard. The nearest boring to the proposed shelter site is about 250 feet north. This boring indicates a depth of 23 feet of very soft, highly compressible peat. The boring continued deeper and showed very soft silty clay to a depth of 37 feet. It was terminated at 46 feet without finding refusal. From this data, it is conceivable that the peat may extend to a depth of 20 feet and soft clay for another 20 feet. Our estimates are based on excavating to a depth of 10 feet and placing granular fill over a mirafi fabric to keep the fill from being absorbed by the peat. This would be covered by a reinforced concrete slab. The culvert sections would be placed on the slab. The cost of material is based on the price list furnished by Elk River Concrete Company. The erection costs consist of unloading the culverts and placing them with proper joints. We have also added more for contingency the normal because of the unknown. Soil borings on the site would be absolutely necessary before proceeding. It should be pointed out that these culverts are extremely heavy. The smallest structure requested would require nine sections. Each section weighs 19 tons making a total of 171 tons for the shelter. Page 14