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• <br /> --- II - -----L-L--- 7 <br /> • <br /> Koch's Soil Testing <br /> • I P.0:6681 <br /> Powo Sad 4 • <br /> Pon PF cnnLoretto, MN 55357 5/25/94 <br /> .4.345 Watertown Rd . , Orono ,Mr . Tel: (612)479-2637 , <br /> Job Site; Aove Address . • • • <br /> I . <br /> I'he urrent 'd <br /> 'crinfield is approximately 15years old (plus ) ;and is now <br /> -'renity bleeding out on the,. Northwest corner. Therefore another site <br /> :-as t;.ested todetermine what type of .system could be installed and still <br /> compIy •with the local codes. <br /> L • I. <br /> The average .percolation rate an the area that was tested had an average <br /> percolation :rate of 24. 7 min/in. and the depth to mottled soil was at <br /> 2$-30 inches . <br /> * Mottled sthil is consider t}ie high seasonal water ( saturated soil level) <br /> that exist during the wet seasons ( Spring and Fall) . The City of ;.Orono <br /> ON-Site Sewage_ Codes require !that the minnmum depth to mottled. soil be <br /> at 5.4 .inches or deeper before a standard trench system can be installed . <br /> Therefore with the above information the only type. of system that can be <br /> installed orl this site is a pressurized mound system. • <br /> . <br /> 1•he size of mound system needed for a 4 bedroom home( based on '600 gallon/day <br /> daily wateriuseage and a perc;. rate of 24. 7 min/in. the sizing factors) would <br /> be 75 ft. along on the^ upslope , 91 ft. long on the downslope, and 38 ft . . <br /> wide. The size' of the rock bed needed would be 10 ft. wide by 55 ft, long <br /> ( 550 sq. ft..) or29 tons of rock. <br /> * see the enclosed design data for the specifications for the proposed <br /> system. <br /> I; <br /> This mound must be pressurized therefore a pump tank ( 1000 gallon) and <br /> a pump(40 g;•p.:m. -160 gal/cycle- 4 cycles/day) must be installed . An alarm <br /> system ( both a sound and a light alarm ) must be installed in the house <br /> to indicate ' .pump failure. s <br /> • <br /> Two 1000 gallon sealed setic tanks must be used , these tanks must be pumped <br /> out every 2-.3 years. <br /> All construction traffic must be kept of the proposed site to avoid . <br /> compaction .of the soil which will result in ruining the site, therefore the <br /> site should ,he roped off by the owner or the builder. • • <br /> Site Evaluator <br /> .. RA. <br /> ' Roabert.1. Koch M('�,/}-t Hal <br /> ' <br /> • <br /> • <br /> 1 <br />