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Pave -8- <br />Light Nessel loam - 1 to 4 percent slope: <br />Green <br />The map symbol for this soil is NeB and the ::gip color is light green. Thi-; <br />Ll <br />soil is nearly level to gently slopingoccupying areas of low relie` and 6n <br />a few hilltops that are above Havden soil on the side slopes. Since this <br />soil �s nearly level little grading is generally required. <br />This soil is wet for short periods with a seasonal watertable at a 3 to <br />foot depth. Shrink -swell (volume change) is low to moderate with changes <br />in moisture content. The soil is 7*dez tely Permeable. Soi: strc-n►;;h is <br />adequate for residential development. <br />Dark Marsh: <br />Blue <br />The nap sNnb, of for this soil 4s Ma and the rap colc:- is ,ark blue. T:te <br />upper S to 10 feet of the rar. s:,i is peaty :^pick or muck. This covers <br />other lavers formed in what was formerly a glacial lake. The ..atertable <br />is near or above the surface the entire Year. These soils have .:eT.:c: <br />hearing capacity. :.e deve'oprent characteristics of these soils are <br />generally unfavorable. These areas are Lest used for :.itural water s_or- <br />age and as scenic open space areas of develo;►ments. <br />I V . P TI-:.'�1'i' I. I. OF SOILS FOR ON -SITE WAS IT. TREATNI N- i <br />.%Axor�'.ing to the recomtend(xl 't)rdinan.:e and Code Regulating In►iividual <br />St�-,Age Disposal Systems" published tiv they Minnesota I*Vartment of !!smith <br />114"1 "\o soil absorption svntm hall ' - installed in xi ar i -h--.-e <br />the watertable is at am• time less than' t. 1/:: feet below izrcgW level <br />or 4 feet b!-low the bottom of the drain field trench". <br />This I ine of thinking has Juui !ed sore -'heat over thir ; ast b ears To re <br />flect research results cotrnhtcted in various areas of the rcrtatty The <br />proposed kti.nnesota Pollution (1,41trol :'Yenco ;TV-4" "IndiviJual <br />reatrneant Systems Standards" states only that " Ile:• bottom of trenches <br />and heels shall be at least three feet above the uatre::rta ale or �edrock'* <br />aril alloWe for installation of additional inm)%ativea systeas other than <br />the standard subsur£;= trench s,;stem to meet this r`4uirement.. <br />,�, eximple of the innovative -ms is the ivstem- in the roamed <br />systems the seepage is or tr es elevated br the uae of saw fill to <br />Provide the 3 foot se n;trat io+ ytark:e hetvt­r 0,A, 1,,ott!m of tiv- .e xjj: : <br />tree h an0 a barrier laver so>:h t, 'he �r bedrev- . <br />In the prelininary "lee .-ommm' I`ract i� s; �,te r.a;v lreattm-nt <br />Systems" 1 'pared by the City of oro na «rx. t',v .esmrat i-.)n di:stam-e* <br />is impli" khetn the: it ,'fist toinl if �t <br />:a feet for instal l.tt ion oaf a - t:uhiar.l <br />