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• Pow T0: Aran 1'. Olson, Village PPar►tett_--P < - _'3 9 FROM: Michael P. Ga „ton, Septic System Inspector DATE: December 24, t979 S08JECT: Soil Bozinq.s - St„tH Bay Matina Property Five soil borings tee'ce made on the ,MaAina ptopetty :-n Decembet 21, 1979. These were dtilted with a 10-12" conti►luou.s n'figh.t aaget and were d-iffed to depths o6 36-42". Borings trere made mainly en the highct gAound along East Lake S.tteet. Locations o6 existing wells weAe noted as well as depth to watet table (see attached drawing). The boil type bound teas mainly black Loam 6aitll! uni6erm 610m the 6ut6aee to the bottom o6 the bonings, atthouc,h a 6" sand tayen was bound about 20" down in Boning B-4. R'ateA table deptha averaged about 30" below the 6uAjaee in bonings 1-4 and about 15" in boAina 5 in the marshy aAca on the nertheast side ol the ptopeAty. No motttiny was ebsC-rued, but mottling is taAe in this type o6 da•tk loam since it is sat;►.tated to neat the su46ace much o6 the .tune and has a high o"ga►lic co►atent. Mottting Witt not show up except possif-£c, i11 the c.nair tram ateas befew the depth observed. We could expect a peAcolation late 06 ,tvm 30 to 90 minutes pet 61ch in the upper tayets e6 this soft which would be acce;,tabte bon a standard op-, mound system ::ndeA notmat conditions. Ho:veve.t, .the craters table depth i6 sea.sonabty 1 to 2 beet Eelow the sut6ace (mote likely in the spring) which would not quati6y the site bon a mound system 6ottowing the standa.ads set in cut code. A mound system would be much more acceptable than the standard sy_stemA cuAtentfy in use on the nearby East Lake p4ope4tie6. Note that the "existing" dtai.ntiiefd on the ,lklaAina site was appaAc►htty encountered in boAing B-3 at a depth or abeu.t 24-30" op, Just in the obberved water table. This drain6ietd :could not be attoteabte 6oA use in the 6utu4e. Pant IiI, Section 2.2h vA .tile Dcsinn Manua£ states as 6ottows: h. SeveAety RestAietive Soils: lo;r£and and mazshy so.its phese►tt extaemetr/ 6eve•te .tma tl011Is o-t a►t1i dtzin�,.icfd instatlati.en due ,o high gAaund wateA table depths, 6tooding hazards and extremely stow percolation Aates. Every reasonable e16ort must be made to ptectude these soils 6.tom consideration 6aA drain6ietd instattatcon. Witete such soils must be considered due to existing tot con6iguiations the pAopo6ed designs shaft be caAe6utty eng.incete.d and could be expected to inctude methods such as cem;:letr soif r.epfacemc►lt mounding, and other innovatierls. The City E►:uince: must approve att such designs and the Cite is u►hdet no ob£i('{atio►1 tc app•tovc• an►r drain�'ield on these 6oif s.