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r l��' ^^�::�i r r _ . <br /> _ •- � - - Page 21 <br /> � o C C� CD�I C <br /> D <br /> FEB �i ]980 <br /> February 4, 1980 . <br /> I ���=�� ' CITJG OF, ORONO <br /> �. � ____��=� , <br /> � , ' ' �1r. I�lalter R. Benson <br /> , _� i Clerk-Administrator � <br /> ; E Orono City Hall - Box 66 <br /> � I Crystal Bay, MN 55323 <br /> � i RE: Infiltration/Inflow Assessment <br /> � <br /> � i Dear Mr. Benson: <br /> I � <br /> ; 4!e are tran�mittinq herewith a summary ef an Infi� trationjinflow <br /> � (I/I) Assessment for your i nforr�ation and use. Tne I/I Assessmei�t v:as <br /> + conducted as part of the Metropoltian 'v;aste Contrcl Comnission's "2G? " <br /> ; ! Facilities Planning Program to comply with Section 201 of the rederal <br /> t,later Polluticn Control Act of 1972 as amended, ��lhere �t is `ound that <br /> ' it is potentially cost-effective to rerrove I/I rather tnan c�nv�y ar.d <br /> ! treat these extraneous flows, federal grant support t�r:ards �he rera- <br /> � I bilitaLion of the sewer sytem will be made available. ?his I/i <br /> ; Assessment is a first step in the identification of sewer sys�e�ns su5ject <br /> i to potentially excessive I/I. <br /> � ' <br /> ; i The I/I Assessment and its results are fully explained in tne interim <br /> i I re�ort "Analysis of Commun�ty Flow'' prPpared by Harza Engineering <br /> ! ! Company as part of the Southwest Facilities rTannina Study. This re�ort, <br /> II previously transmitted to each community, presents an estimatE of the I/I <br /> , quaniLites and the p�tential excessiveness ot the I/I, based on quidelin2� <br /> � � for a ccst-effective determination promul5ated by the U. S. EnvironTenta ! <br /> � � Protection Agency. <br /> � � <br /> � The recommendatio�s (se� a-t�a�hedl of the repc�rt iiave been accepted witii <br /> i modif�catior bv the Minnesota Pollut�on Control Agency (t�l?CA) . �=imdino <br /> � of further I/I anal,sis for s�,st�ms j�daec+ to �e �c�.2Rt�a11_: exc`�s;��P <br /> ! is ���-0111Cip!'��C, -^� ;mp;�me^�aL:cn ::r" �i�� rec��Tw'?1?CIC3t:o�s ,yi i i !�e as <br /> � follows: <br /> 1 . Al l communities certi�ied as hav�og r.on-excessive I/I w„1 not aual ;r; <br /> � for �urther �unding o` an I/I analys� s. <br /> i <br /> 2. All communities certifiec as having excessive or possibiy �xcessi�:e <br /> I!I wi� 1 q�alify for fur•ther func�ing of ar, I;I analysi�. �he �c�pe oi <br /> i each community's I/i analysis may vary depPnd�ng upon �oca�ion of o;�- <br /> vi�us sources of i/I and/or results of �nte;views to �e ccr,�uct�� ��-ic <br /> to any in-sysier� flow �nitor:��, <br /> 3. A.11 comnunities iackina su�ficient SU��Of+1�10 data te LP''�it�� th-� <br /> e,ci s tence Jr Pxcess i ve I!� Wl I � IlI�IUArgC ra���r(1 l fl i;e!"�l Z+�15 LO FS�8�!i �, . <br /> , �revious experienc2 w�th flo�d�na, s��ri:h3rging ��r byan��inn �ue �a I/i <br /> ' L ' � 'blP existence �' <br /> 350fTlETRO/OUAREBLDG. ' Z1d �� assess other availab, e inf�rr�ation ,.n the p�s�� <br /> 7TH6 ROBERUTREEU � Qxcess�ve i/1. TFose COT11T1Uf11`�,1 eS l,'�.2f1�:f:ed by ��2 Ndt�ern 111tE""`'1 e'•':`. <br /> /RIf1T PRUL fTlfl 55101 , <br /> - 612 222•8423 � <br />