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Koch's Soil Testing <br /> ` P.O. Box 81 <br /> t ` Loretto, MN 55357 <br /> Tel: (612)479-2637 <br /> rou,g Ferz 10/5/93 <br /> 380 Turnham Ad . <br /> Orono , Yinn. <br /> Job Site; Above Address <br /> rhe present drainfield was = leaching out on the surface at the <br /> end of the trenches. Therefore another site was tested to determine <br /> what type of drainfield could be installed and still meet the local <br /> codes. <br /> The average percolation rate in the area that was tested was 50. 7 min/in. <br /> And the depth to mottled soil was at 14-30 inches. <br /> * rotttled soil is consider the high seasonal water table that exist <br /> during the wet seasons and the minnmum depth to motlled soil in the <br /> City of Orono must be 54 inches or deepeer before a standard drainfield <br /> can be installed. ( City Codes ) . <br /> Therefore the only type of system that can be installed in th&s lot " <br /> Is a pressurized mound system. <br /> The size of--mound needed for a 4 bedroom home based. on ,600_.gal/day daily <br /> water useage and a perc. rate of 50. 7 min/in the sizing factors -would <br /> be 71 ft. long on the upslope, 103 ft. olong on the downslope and <br /> 58 ft. wide. The size - of the rock layer would need tb be 10 ft. wide <br /> by 55 ft. long ( 550 sq.ft. ) Or 29 tons of rock is required. , <br /> This mound rust be pressurized therefore a pump tank ( 1000 gallon) <br /> and a pump ( 4.0 g.p.m.-159 gal/cycle- 4 cyles/day) must be installed. <br /> An alarm system ( both a sound and a light alarm) must be installed <br /> In the house to indicate pump failure. <br /> * Dote ; This pump must be able to overcome at least 11 .7 ft. of head <br /> pressure. <br /> Two 1000 gallon are alreadis in place these tanks should ve inspected <br /> to make sure they meet the current codes, if . they do not meet the code <br /> then two new 1000 gallon tanks must be installed. <br /> Only clean wash sand should be used in this mound therefore this <br /> sand should be inspected by the local inspector to make sute it meets <br /> the code. , <br /> " <br /> Note; The land slolle were the system will be located on is 11 % <br /> therefore„ .local variance will have to be" granted as the .City Codes <br /> only a15ow° a maximum, slope of .6% for •.placement .of -mound ,system. <br /> However ,this is th0pnly avialable area to locate a system on. <br /> Due to t e jlo a" a d the presence of water" in the soil borings I <br /> suggest a' ai interceptor drain be installed on the top side <br /> of the mound to prevent water from flowing under and thru to mound. <br /> which might cause the mound to fail in the wet seasons. <br /> Site Evaluator <br /> Robert Koch <br /> 'Robert A.' -Koch <br /> MPCA Certified <br />