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-m » ^ <br />ADVANCE SURVEYING ft ENGINEERING CO. <br />■mp^MNIMM <br />Oetob«r 5, 1987 <br />Mr. 6r«g P«rl <br />309 W«at ZrfJc* StTMt <br />Long U)M, MM 55356 <br />r , <br />k <br />-ii <br />DMur crttgi <br />♦ » <br />At your r^quMt v hxvm conducted an invastigatioa of aoil <br />. eonditiona at your hoBooita in Long Laka, Minnaaota. Tha aita <br />la loeatad at 309 Maat Laka straat in Long Laka. <br />« <br />Oaa or aora daap fcoringa vara takan to dataet any avidanca' of <br />>. a high watar tabla audh aa actual atanding vatar in tha boring <br />or ataiaing of tha aoil by tha action of anaerobic bactaria <br />vhich liva in aaaaonally aaturatad cenditiona. Thia <br />BUltieolorad ataining of tha aoil known aa "aottling" , it, <br />found, indieataa that for at laaat part of tha yaar, <br />inauffioiant air ia contained in tha aoil to aupport aerobic <br />bactaria that are affective in tha purification of aawaga and <br />that tha aoil ia unable to tranaait nonal rainfall without <br />baconing aaturatad. Tha boringa alao liat aoil typo and <br />taxtura ainca diffarant aoil typaa vary in tha. rata at which <br />thay are abla to abaorb aawaga. <br />Percolation taata vara alao takan to naaaxara tha rata at which <br />tha aoil in tha area of tha propoaad drainfiald can abaorb and <br />treat aawaga affluent. Thaaa percolation taata are ahallow <br />boringa vTiich approximate tha drainfiald in eparation. Thay ^ <br />ara drilled to about tha aama depth aa tha drai^iald propoaad <br />for conatruetien and filled with about 13 inchaa of water. <br />■ <br />In a clayey or ailty aoil, tha boringa ara allowed to aoak and ■. <br />tine ia allowed for tha aoil partiolaa to avail and fill tha . poraa in tha aoil ao that conditiona will approxiaata actual, ? <br />drainfiald operation. A maaauraaant ia than takan of how many - <br />minutaa art required for tha vatar in tha boringa to drop by ', <br />one inch. Thia aaaauramant ia known aa tha percolation rata . <br />and ia axpraaaad in minutaa par inch (MPX). , <br />- t <br />» * <br />■V, <br />K