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� TNIS ITEM ��S �EEN <br /> -� � MI�ROF'ILMED <br /> SIT� EVAI.,U:ITION R�PORT ' <br /> i�'OR HARRISON R. JQHi15TON, JR. <br /> ORONO, MINNFSOTA <br /> 10-22-80 <br /> During October J.7-22, 198� all five proposed lots in the sub- <br /> division of Harrison Joh.�ston, Jr. were tested for the suitability <br /> of supporting on-site drainfiAld sy3terns. �3ix percolation holes <br /> were tested on each lot r�nd three soil borin�� taken on eacl� lot <br /> to determine botil� primary and alternate drainfield sites, ihe <br /> percolation holes were dug 6 inches in diar��eter to the 4 foot depth <br /> except the altornate site on lot 1, block 2 where holos 5-6 were <br /> dug 2 feet de��� to test for a sha�.low trench system. The holes were <br /> dug with both po�rer and hand augers. <br /> The soil borin�rs were du� t•rith hand au�ers and were � iriches <br /> in diameter to the !� foot depth and 3 inche9 in diameter to the re- <br /> n�aining depth, Some very permeable soils were found on most lots <br /> aric? all lots ��ad sufficient percolation rates to qualiry for atan- <br /> dard drainfield systems, The alternate sits on lot 1, bloak 1 will <br /> require shallower trenches to avoid the water table. �Irhe trenchea <br /> on the primary site of lc�t 1 , b].oak 3 will also need to be aonat- <br /> ructed fairly shal] ow an�l an interceptor drain should be used to <br /> divert runoff water from this site sinae the lot is bowl shaped � <br /> and collects runoff water. � <br /> Hetter soil was enaa�untered shallower on the alternate s te • <br /> of 1 hould be ua d In lot <br /> 3 of block 1 a pump will probably be needed aince the best soils <br /> exist on top of the hill. A so mig e necessary to use pumps <br /> on other lots depen ng � th8 placement of the houses. Additiona�. <br /> design inforn�ation for tY::e individual houses will bo needed prior <br /> to construction. It is impe .rative that thase tested area not be � <br /> disturbed since there are some steep sidehill slopes on some lots <br /> ancl 3ome prohibitiva soils and water tab_i. :. near t��= marshes which <br /> may r_,reclude an9 other areaa being used #'or drainfie�ds, <br /> If any additional inPormation is ne�ded, please contaat me. <br /> � ... i <br />