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8 A' Rom. 444d4 & 4. ,, 9,wr <br />e� <br />"is */. 16"A -44FAMOV d6 <br />one 0. •eweeb", P.R. <br />Lewrewer P. reYWw• ra. <br />At Aa4 NAmoswls aa»a <br />Robot Romm,dM0 <br />reek, r.a. <br />ph C. <br />Jeeerk c. An4dtk, r.t <br />P.R.Pir.Gig=X"A <br />A. <br />re�w �. r+,r,bA, Pi. <br />P�nssv `-t �,tA^ <br />WOMwV <br />O <br />Buller/ A. L nsbos P.F. the •�r.r, P.R. <br />Reber D. PHONVI, Pi. <br />Rk �n, rl. <br />February 21, 1978 FED '2 <br />Rk"erf X. rrrwer, P.E. <br />JMWS C. otMw, P.H. <br />Rubes d" rl. <br />Afwvk, c..', *Id. r,s. <br />6 <br />.q0 P.R. <br />Ar~gk R. MN&W' r r. <br />Mr. Michael P. Gaffro � <br />A. zp kkwx <br />"' <br />� <br />�R`- <br />Septic System inspecto <br />L"MHES M. <br />Lee M. kky <br />kp <br />KWAM M. obew <br />City of Orono <br />Box 66 <br />Crystal Bay, Mn. 55323 <br />Re: Percolation Tests <br />Lot 8, Block 1 <br />Farview Addition <br />Cur File No. 139 <br />Lear M: , C 'iron: <br />We have =.viewed the Soil Borings and Percolation Tests Report dated February 13, <br />1978 prepa�.ed by Braun Engineering Testing for the above lot. Based on the <br />test resulca indicated in the report, a standard septic tank-drainfield system <br />cannot .e apl,, wed. The tesz results exceed the minimum requirements by such a <br />large de,yree gnat no further consideration should be given to the standard sys- <br />tem. <br />With respect to innovative systems, we quote from Section 4 of the proposed <br />"City of Orono On -Site Sewage Treatment System Design Manual" as follows: <br />"Application for innovative system installation variances shall include <br />all the data required for standard system application, plus any addition- <br />al data necessary to establish the acct�ptsbility of the proposal. Such <br />data would normally include case histor, I similar installations, <br />manufacturer's literature, independent results and engineering re- <br />ports." <br />The Braun report suggests that the mound system may be ieasible. However, no <br />detailed design features or layouts are presented. The proposed On -Site Design <br />Manual indicates that percolation rates should be faster than 60 minutes per inch <br />on the surface and faster than 120 minutes per inch in the sub -soil and/or sub- <br />stratuir for the mound system. <br />We recommend that the Owner of Lot 8, Block 1 be advised that based on percola- <br />tion rates submitted in the test data, the standard septic tank-drainfield sys- <br />tem cannot be installed and further if he wishes to pursue any alternate <br />innovative system, he must submit a detailed design layout in accordance with <br />Section 4 listed above. The City of Orono should not be placed in the position <br />of designing a system for the property owner, but rather should review a proposed <br />design prepared for and submitted by the Owner. <br />Page 1. <br />