Laserfiche WebLink
d30N.d'0IlOOr ROddoo* T/N i� 8c TIddAOlo�id, JNQ <br />Zsds '.Haab .lV*4&" 96 <br />dt Aa4 AIJwsadoIa sa/>s <br />Avow 6d6-*600 <br />March 10, 1978 <br />Mr. Michael P. Gaffron <br />Septic System Inspector <br />City of Orono <br />Box 66 <br />Crystal Bay, Mn. 55323 <br />Re: Septic System Design Review <br />Lot 3, Block 1 Aud. Sub 203 <br />Our File No. 139 <br />Dear Mike, <br />Otto G. Eonestroo, T.E. <br />Robert W. Roune, P.E. <br />de Joseph C. Anrltk, P.E. <br />Bradford A. Lentber;, P.E. <br />Robert D. Prtjaard, P.E. <br />Rickard E. Turner, P.E. <br />James C. Olson, P.E. <br />Lawrence P. Feldslen, P.E. <br />Glenn R. Cook, P.F. <br />Keith A. Gordon, P.E. <br />Thom" E. Noyes, P.E. <br />Richard W. Potter, P.F. <br />Robert G. SchoWells, P.E. <br />Marvin L. Sorvela, P.F. <br />Donald C. Ewpprdt, P.E. <br />Kenneth R. Meister, P.E. <br />Charles A. Erickson <br />Leo M. Pewelsky <br />Harlan M. Olson <br />We have reviewed the proposed on -site sewerage design for the Burnhart Residence <br />at Lot 3, Block 1 of Lot 49, Aud. Sub. #203 submitted by Braun Engineering Testing <br />dated Feb. 6, 1978 and offer the following comments. <br />The drainfield as laid out by Braun Engineering is adequate to meet the code re- <br />quirements for a primary drainfield site. Three of the percolation tests are at <br />60 mpi (P-18, P-27 and P-28) and one test is at 54 mpi (P-29). There are 5 dis- <br />tribution lines shown each 80 feet in length yielding 1,000 sq.ft. of trench area <br />which is adequate for a three bedroom home. Two future distribution lines are <br />indicated which would yield a trench area of 400 sq.ft. <br />The two future lines indicated on the drawing are not adequate to meet the require- <br />ments of a secondary drainfield site. The remaining percolation tests around the <br />proposed primary site does not indicate adequate soil for expansion. Therefore, we <br />recommend that it be suggested to the Owner to change the design layout somewhat <br />in order to reserve more room for the secondary site area. For example, if the dis- <br />tribution pipes were changed to 4 lines each 100 feet long, there would be addition- <br />al room for expansion to the sides of the drainfield area. In addition, in pro- <br />posed WPC 40, Section H, 5 (page 720) there are recommended reductions in trench <br />area that can be applied as the result of increasing the depth of filter material <br />below the distribution pipes. <br />In conclusion, it is our opinion that the design as submitted meets the require- <br />ments of a primary site, but we recommend that changes or rearrangements in the <br />design be made in order to reserve adequate space for a secondary site in the same <br />general area as the primary site. <br />Yours very Truly, <br />I�pNESTRbO, ROSENB�?ERLIK 6 ASSOCIATES, INC. <br />Jame�Ols n <br />JCO:li / <br />l <br />