Laserfiche WebLink
'! <br /> I <br /> I <br /> I <br /> I <br /> I <br /> <br />i <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />A KANSON <br /> NDER oeON <br /> ASSOCIA TEo% Inc. <br />P.O. Box GG5 2G~5 4th A venue North <br /> <br />professional engfi~eers and surveyors <br /> <br />Anoka, Minnesota 55303 <br /> <br />July 29, 1980 <br /> <br />812/427-5860 <br /> <br />Mr. Jay Jot~son <br />Miller, Hanson, Westerbeck, Bell Architects, Inc. <br />100 North 6th Street <br />Minneapolis, Minnesota 55403 <br /> <br />Re: Schmidt Soils <br /> <br />Dear Mr. Johnson: <br /> <br />At your request estimates of sewage flow and required disposal area have been / <br />determined for the shopping center proposed for the property at the southwest <br />quadrant of the intersection of 167th Avenue N.W. and State Highway No. 47 <br />in Ramsey, Minnesota. It is understood that the proposed shopping center would <br />house three or four individual stores. Based on Minnesota Pollution Control <br />Agency guidelines, estimated flow per public toilet room is 500 gallons per day. <br />Four individual stores would contain two (male and female) public toilet rooms <br />each for a total of eight public toilets in the shopping center. Therefore, <br />total estimated flow is 4,000 gallons per day. <br /> <br />A standard'sewage disposal system is unacceptable for this site due to the shallow <br />depth to ground water. As recommended in our report of January 15, 1979 a mound <br />type septic system is needed to provide the required elevation difference of three <br />(3.0) feet between the bottom of the rock bed of the septic system and the ground <br />water. The mound system requires 0.83 square feet of rock bed area per gallon of <br />effluent. <br /> <br />4,000 gal x 0.83 ft2/gal - 3,333 ft2 <br /> <br />Two mounds, each with two rock beds 10 feet wide by 83 feet long separated by 4 <br />feet along the length of the rock beds, would be needed. With 3:1 sideslopes <br />and a minimum of one foot of medium sand fill beneath the rock beds, the basal <br />dimensions of each mound are 42 feet wide by 101 feet long, or 4,242 square feet. <br />The total area covered by the mounds is 8,484 square feet. The design area <br />computation is based solely on estimated sewage flow from eight public toilet <br />rooms. Additional sewage flow from sinks, water fountains and miscellaneous <br />plumbing fixtures must be determined before a final design area can be recommended. <br /> <br />Should a laundromat or car wash occupy part of the shopping center, the design <br />area suggested here cannot be used and a re-evaluation of site acceptability <br />for sewage disposal must be considered. <br /> <br />civil · municipal · planning · soils · /and surveying <br /> <br /> <br />