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` <br /> ��C�6'S ��SI� �c���lnc� <br /> • � ' P.O. 8ox 81 � <br /> . -� ' Loretto, MN 55357 <br /> TeL (612) 419-2631 � <br /> susan wi�son RECEIVE� 8�20�97 � <br /> 325 So. Brown Rd . A�� 2 1 1997 <br /> Orono, Minn. <br /> t;ll•; Ur ORONC) <br /> Job,.; Site; Above Address <br /> Percolation tests and soil bo_rings were done on the above site � <br /> on 4/27/97 and it was determine that a mound system would have to <br /> be installed due to the mottled soil levels . � <br /> * Mottled soil was at 18 , 20. and 28 inches . ( S .B.# 3 , 5 & 6) <br /> The average percolation rate was 22 . 1 min/in. in the area that was <br /> tested . <br /> Therefore a mound system was design to accomndate a 4 bedroom home � <br /> based on the above mottled soil levels and the ave . percolation rate. <br /> * See the report dated 5/16/97 for the details . <br /> However aft�r the site was tested and staked off some unecceaary <br /> consruction traffic occured over the proposed mound system <br /> and some bobcat tracks were left after this traffic • occured . <br /> Due to the fact that this ��aacz.t tracks existed there was some concern <br /> by the City of Orono Inspector (Mr. Steve Wickman) , that some <br /> compaction was done and the percolation , rates could be- al�er . <br /> Therefore two percolation tests were done in the tire tracks on ' , ' . � <br /> 8/15/97 '- with the following results; <br /> Percolation Hole # lA--- Perc. Rate--24 .4 min/in. <br /> �� �� # 2A ---- " " -- 20 . 8 min/in. <br /> Therefore when comparing these rates to the orginal perc . rate <br /> of 22 . 1 min/in . ( the ave . perc. rate obtained on 4/27/97 ) �� <br /> the perc .rates obtained on 8/15/97 did not change . <br /> Therefore even tho construction traffic did exist the percolation rate s <br /> in the proposed area was the same and the same sizing factors can � <br /> be use to size out the mound system. <br /> The mound design that was done in the 5/16/97 report should be used <br /> when installing the mound system. <br /> However Istrongly suggest the this proposed mound system be roped � <br /> to prevent any �uture construction traffic from going over the <br /> proposed area . <br /> Site Evaluator <br /> �U.Q.� � . �� <br /> Robert A. Koch M.P.C .A.# 193 <br /> Robert Ko�h . MPCA Cercified <br />