3430 SEVENICH DR Geotech Report 2018-01-02 MF Import

Mr. Bill Rucker ?.5 Septsmber 1992 W-8396 Pape 17 '- Ws peneraliy recommend all permanent slopes be desipned�t a 2H:1 V inclinadon or flaRer. All slopes affected durinp site pradinp ahould be provided with deep rooted prolific pround eover as soon a: — poceibls aiter construction. It seepaps is encountered in excavated tlopes, it will likely be neceasary to blanket ths slopes with quarry spalla, lipht rip-rap, or equivalent, in order to control erosion. Rcbininp Wdl Con�idantion� snd Desipn Crkeria We rscommend that the cut slope�djacent to the concrete driveway near the entrance to the site be supported by a cantilever soldier pile reuininp wall system. Basad upon our field observation:, it would �ppear ths wall hsiphu may ranpe up to about 8 fset, with an approximatoly ��4FI:1 V slops behind ths proposed reUininp wall. This 3/4H:1 V slope anpie assumes that the exiatinp slope upslope of the wall remaint undisturbed. If the slope is disturbed durinp construction or by erosion or other .._ meana, h wouid be necessary to increasa the heipht of the wail to accommodate a slope repair. Other conwntional wNl types would requiro excavatior for a relatively wide, deep foundation which could undermine the slope without the use of shorinp. Methods such as driven timber pilinp would requira the use of larpe crane-type equipment, and drivinp to achieve neceasary penetntion would be difficult in the hard subsurt�ca soils. We aro of Me opinion that a retaininp wall system which ic pre-ineutled, • , . � ' , such ae a soldier pile wall, would present the least risk of slope failure durinp conatruction and would ' ' be the most practical to inatall. The followinp subsections present our recommendations concerninp latenl estth pressures, soidier pilea, and wall facinp. Ths followinp peotechnical desipn criteria relate primarily to cantilevered soldier piles. Wall heiphu proater than about 10 to 72 feet may require the use of soldier piles with tieback anchors. !f necessary, we can provide desipn criteria for a tied-back soldier pile retaininp wall system at a later dats. Lat�nl Earth prassures �' Desipn of the eaRh retention system could be basad on either 'active" or 'at•rest" lateral eatth pressures, dependinp on the amount of lateral displacement and associated settlement which can be „ tolented. Shorinp which is free to deform on the order of 0.001 to 0.002 times the heipht of the shorinp is considered to be eapable oi mobilizinp active earth pressures. This lateral deformation may � be accompanied by vertical settlement of up to about 1 inch, which may extend back from the top of the wall a distance equal to rouphly the heipht of the retained cut. A propressively smaller amount of T vertical settlement would be anticipated as setback increases beyond this point. Increasinp amounts of Iatural detormation could aliow sipnificantly preater venical settlement.Where no structural elements �'� �� AGRA EaRh&Enviionmsnial Gro�p