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f ,>i.i</. *4^4,S «%i.-'“n.•* • ' ** * * - W. m'*^ ^ iiT^ C ' ,*^dt **i » * *t . \^* ’ •' '*• •*.'<*•*.■ ■ *• ’■ ■ “Jfc* **•' ^■ ' . . I. ^ • . ’ . k < * . 1 ' • ^ • * • ’ f ' *" ‘ < ' ’' • * ^ 'f ''. ' ■ v'*?’. ‘ ; k ' f* “. * *“* ■'‘f«« <br />ADVANCE SURVEYING & ENGINEERING CO. <br />Mil C>d» tafck IU>d. MIimi»»p>Iw. MW l<41« PboM Ml 3U0 <br />OctObUT 5, 1987 <br />Nr. Grttg P«rl <br />309 W«st Z«aX« Str«at <br />Long LaJco, NN 55356 <br />Daar Grog: <br />At your roquost vo havo conductod an invootigation of soil <br />conditions at your hoaosits in Long Lako, Minnosota. Tha sita <br />is looatad at 309 Hast Laka Straat in Long Laka. <br />Ona or nora daap borings vara takan to datact any avidanca of <br />a high vatar tabla such as actual standing vatar In tha boring <br />or staining of tha soil by tha action of anaarobio bactaria <br />which liva in saasonally saturatad conditions. This <br />aultioolorad staining of tha soil known as "aottling" , if. <br />found, indicatas that for at laast part of tha yaar, <br />insufficiant air is containad in tha soil to support aarobic <br />bactaria that ara affactiva in tha purification of savaga and <br />that tha soil is unabla to transmit normal rainfall without <br />bacoming saturatad. Tha borings also list soil typa and <br />taxtura sinca diffarant soil typas vary in tha rata at which <br />thay ara abla to absorb savaga. <br />• • <br />Parcolation tasts vara also takan to maasura tha rata at which <br />tha soil in tha araa of tha proposad drainfiald can absorb and <br />traat savaga affluant. Thasa parcolation tasts ara shallow ” <br />borings which approximata tha drainfiald in oparation. Thay <br />ara drillad to about tha sama dapth as tha drainfiald proposad <br />for construction and fillad with about 12 inohas of vatar. <br />% <br />In a clayay or silty soil, tha borings ara allowad to soak and ■, <br />tima is allowad for tha soil partiolas to svall and fill tha .. <br />poras in tha soil so that conditions will approximata actual .. ;; <br />drainfiald oparation. A maasuramant is than takan of bow many <br />minutas art raquirad for tha vatar in tha borings to drop by ' <br />ona inch. This maasuramant is known as tha parcolation rata . <br />and is axprassad in minutas par inch (MPZ). . . <br />• «• <br />:.i <br />v‘i' <br />• 0 <br />jVt-M <br />■'s ■ •,