Private Road - 1983 No Address #

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SITE, FWALUA TION REPORT '�`OR HARRISON R. JOHNST011 , JR. (MONO, MINNF,30TA 10-22-80 During October 17-220 1980 all five proposed lots in the sub- division of Harrison Johnston, Jr. were tested for the suitability of supporting; on-site drainfield systems. Six percolation holes were tested on each lot and three soil borings taken on each iot to deteimiino both primary and alternate drainfield sites. the percolation holes were dug 6 inches in diareter to the 4 foot depth except the alternate site on lot 10 block 2 where holes 5-6 were dug 2 feet deo -, to test for a shallow trench system. The holes were dug with both pourer and hand augers. "he soil borings were dug with hand augers and were 6 inches in diameter to the 4 foot depth and 3 inches in diameter to the re- r,:ainin- depth. Some very permeable soils were found on most lots enc? all lot:; 'Pa(I sufficient percolation rates to qualify for stan- dard drainfield systems. The alternate site on lot 1, block 1 will require shallower trenches to avoid the water table. "i-Tie trenches on the primary site of lot 19 block 3 will also need to be const- ructed fairly shallow and an interceptor drain should be used to divert runoff water from this site since the lot is bowl shaped and coll,,cts runoff water. Better soil was encountered shallower on the alternate site of lot 1. , block 2 so shallow trenches should be used here. In lot 3 of block 1 a pump will probably be needed since the best soils exist on ton of the hill.. It also might be necessary to use pumps on other lots depending on t'r-j@ placement of the houses. Additional design information for the individual houses will be needed prior to construction. It is imperative that these tested area not be disturbed since there are some steep sidehill slopes on some lots e• and some prohibitive soils and water tab ,. :: near tli- marshes which may nreclude any other areas being used for drainfields. If any additional information is needed, please► contact me.