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C AY.-- <br /> Koch ' s Soil Testing <br /> • <br /> Box 81 <br /> Loretto, Minn., 55357 <br /> Jim Cox 9/3/07 <br /> 1020 Willow Dr. <br /> Orono, Minn. <br /> Tel 952-473-9625 <br /> Job Site; Above Address <br /> The present drainfield was determine by the City of Orono to be a <br /> failing system and has to be replaced. <br /> * See City of Orono f information for the details. <br /> The site that was tested had an average percolation rate of 11 . 1 min/in. <br /> and the depth to mottled soil was at 1 . 5-1 . 8 ft. , with standing <br /> water at 1 . 7-2. 0 ft. <br /> The current City of Orono Codes require that the minnimum depth to <br /> mottled soil and standing water musr be at 48 inches or deeper before <br /> a trench drainfield system can be installed. <br /> Therefore with the above information the only type of system that <br /> can be installed is a pressurized mound system and still be consider <br /> a standard drainfield system according th- to the current codes. <br /> The size of mound system needed for a 3 bedroom home would <br /> be the following size; <br /> Sizing Factors; PercolatiorrRate Range 46-60 min/in ( Clay Loam Soil ) <br /> Daily-Water Use; ; --450 gal/day • <br /> Land Slope; ;--2 % <br /> Overall.'Size of mound needed; ;--2952 sq. ft. <br /> Upslope Length--69 ft. <br /> Downslope LLedgth---75 ft. <br /> Width; ;--41 ft. ( Upslope--14 ft. , Rock--loft. --17 f <br /> Absorption Width--27 ft. ) <br /> Rock Bed Size; ; -410 sq. ft. ( Width--10 ft. , Length--41 ft. ) <br /> `11"L'Amti int of materials needed; <br /> Sand--160 yds. , 224 yds. Ave. Depth--1 . 6 ft. <br /> Rock; --16 ydsd. 23 tons " "--1 . 0, ft <br /> Sandy Loam--35 yds. " " 1 . 0 ft. <br /> Topsoil--120 yds. "-- 9-12 inches <br /> * The above amounts could vary by 10 % plus or minus. <br /> This mound must 'be. pressurized therefore a pump tank and a pump <br /> is needed; <br /> Size of pump tank; ; 1 -1000 gallon sealed tank <br /> Size of pump; ; 30 g.p.m. ( must overcome at least 14. 9 ft. of hedd press. ) <br /> Pumping Rate; ; 139 gal/cycle ( 4 cycles/day ) <br /> * An alarm system must be installed to indicate pump failure, this <br /> must be both a sound and a light alarm system. <br /> Size of Septic Tanks needed; ; 2-1000 gallon seasled septic tanks, <br /> these tanks should be pumped out every 2-3 years. <br /> Robert A. Koch 2 f�_ n.G M. P. C. A. Cert . a 193/ 1429 <br />