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6;0-7 - <br />toft•./idK <br />.t��ups'�""'t" <br />1040 Garland Lune w9 <br />xayseta, znn ss ota 55391 <br />Noveaoer 13P 1971 <br />//-d;Ve77 :dr. William Parmoll <br />ffiep -860-3r�,wn Road P00A <br />L4% Lake, Ainnesota <br />ilei I-iproveaent to drainfield at Oft Brown Road <br />rear Sirs <br />In tte interest of 1,2grovire the oreration of the <br />dre! n.'i eld on -?sur prorerty, I have a or►ducted some, <br />Pere o! *•tion tests erd wrsined tt-e site for the <br />purpose of constructing remedial facilities. <br />?roe our initial conversation, I learned that the <br />existing s jets=, wt -J& war built to an effective <br />absorpti om area of W square feet has been unable <br />to dispose of the septic tank effluent during periods <br />of heav-y water usage. <br />T" a percolation tests (3) were in the range of 120 <br />to 130 ai-stem per inch. While this rate is consider- <br />abli slower then our present minisoon rates for new <br />construction of conventional systw• it is Ai opinion <br />that t e drainfield is funotioniog proporlj# but ser- <br />iously undersized. I have mat with Mfr. Gregg ?re,ck of <br />.4cCombs Knutson, the Orono City Engineers at the site <br />to solicit his views on correcting the problem. Ar. <br />Franc reconended the addition of aDO eq. ft. of <br />drainficle to the present sytaa. I cosmur in this <br />reooamandetion. <br />since the area available for enlorgarsent of the 9.1stea <br />is somewhat lisdted. I propose that the additional <br />drainfield be constructed with a lee ainious depth of <br />filter rock under the distribution pipes. Zhe <br />Minnesota ibllutiens Control Agencies 3ulletin VPC --40 <br />allows a 2D% reduction to arae for a 121 dept. of filter. <br />Ibis would result in an expansion drainfield of &JO sq. ft. <br />Please call if you have a%W questions on this matter. <br />• ver tW. <br />Car 1 W. Borg P. L <br />cc. Al 01aan 'lines. Rag. i75W <br />