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., <br /> . ��c�'S ��i� ��'���in� <br /> -�--' P.O. 8ox 81 � � <br /> �-� ' �oretto, MN 55357 � <br /> Tel: t6121479-2637 : <br /> Susan wilson R�CEIVED 8�20�97 <br /> 325 so . Brown Rd. AUG 2 1 1997 <br /> Orono, Minn. <br /> GITY Ur ORONO <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 accom�date 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 after the site was tested and staked off some uneccesary <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 �-�acz.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 � <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 /> (�� � . �,'� <br /> Robert A. Koch M.P.C .A.# 193 <br /> �obert I<och . MPCA Certified <br />