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

� Mr. &�' Rucker W-8396 25 SeErtemb�r 1892 Pape 3 ^ and would support�n�djacent slope inciined at about sisH:1 V IHorizontal:Vertical�. Due to the limked acces� and steepnest of ths tlope, a eantilevered soldisr pile system would appear to be the most ,_ pnctical wall typs available. SUBSURfACE EXPLORATION Our subaurtacs exploration propram for this projeet consisted of advancinp siuteen backhoe test piu in potendal Ixetions for new residences, and advancinp one hollow•stem-auper borinp near the '�^ entrance drive of Sevenich Drive at the loeation of a proposed retaininp wall. Approximate locations of the explorations completed for this ctudy are shown on ths Site and Expioration Plan, Fpuro 1, --� attaehsd with this roport. Interprotiva descriptions of the subsurfaes conditiona encountered et the euploration locationa orc presented at the end of thia repoK. , , Backhos test pitt wero excavated with a rubber-tirad backhoe provided by the property owner. All explontions wera eontinuously 1o00ed in tha fieid by an experienced enpineerinp peolopist from our firm. In-situ smnpth and quality ataibutes of materiais encountered in the tast piu were estimated by our field observer based on experience with similar soils and the difficulty incurred durinp ' ' ezcavation. � � . � . . The auper borinp advanced for this project was completed by a local driliinp contractor work3np under . subconffact to our firm. The drillinp process involved advancinp a hollow-stem auper into the pround, and collectinp samples at repular intervals throuph the hollow auper etem aecordinp to a standardized samplinp method. Auper drillinp samples were obtained by the Standard Penetration Test (SPT) method in accordance with ASTM D-1586, which allows correlation of the Standard Penetration resistance, N, or blowcount. Reprasantative samples of soils encountered in the test pits and auper borinps were placed in moiature � tipht containers and retumed to the laboratory for furthar elaasification. The depths ahown on ths lops are approximate, and where chan�ies were Oradual, represent avernpe values. SUBSURFACE CONDITIONS Subsurface conditions observed in our explorations were somewhat variable across the site. At the Oround surface, a root•rich oryanic topsoil horizon was peneraily observed to be about l5 to 2 feet in thickness. Below this surficial topsoil horizon, medium dense silty fine sands or medium stiff silt to fine sandy silt were typically encountered to depths of about 434 to 10 feet. Several test pits . , AGRA Earth&Environmental Group