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

"' Mr. &II Rucker W-8386 25 S�ptembsr 1992 PaDe 4 - encounterod 6�etund, stiff to very stiff sik �t daptht of about 7 to 9 feet. Two test piu were sipnificanHy dift�ront from these Osner�lizations. Test pit TP-4,located on the southem portion of the site, conuined ralaNvely softer sik with a dismrbsd te�ctura. Tea pit TP-16, located in the access ~ driveway near the p�anned retaininp wall, eontained loose to medium dense silty sand;. Both test pit TP-4 and TP-18 eneountered roladvsly heavy proundwater seepe0e, and both test pit ezcavations �� displaysd roladvely heavy cavinp. � ^ The borinp advanced for the project, borinp B•1, was located alonp Me entrance driveway in the area of a proposed rcuinin0 wall. Soil eonditions eneounterod in the borinp penerally consisted of , , approximately 5 teet of looss fill and wet sand, transitioninp at approximately 7 feet to herd, moist, . fractured blue-pray, fins wndy ctlt. Thi: silt unit was relatively consistent from a depth of 7 feet to a depm of 26X feet, the deepest peneuation of the borinp. , Groundwatar w�t encountersd in a fsw of the expioratione for this projeM. Based on our observationa, ' ' h�ppsarod that proundw�ter was contained primarily in preferential sespape zones provided by sandy � � soil lanses�nd dieturbed soil texturo. It ahould be noted that our exploradon work for Mis project wes � � conducted aiter � lonp period of dry weather, therefore, the obaerved proundwater and soil moiature � . ' • eonditions likely represented seaconal minimums. Fluctuations in proundwater levele should be i ,,, anticipated in response to chanpes in seasonal precipitation, on and offsite land usape, and other „ f�ctorc. CONCLUSIONS AND RECOMMENDATIONS It appears that the proposed residential development at this site may be feasible from a peotechnical standpoint,provided that lot loeations are seleeted in accordance with the reeommendatiuns presented ' harein, and that appropriate construetion praetices are employed. It should be reaiized that portions of the subjeet property are aNeeted by unsteble slopes, based on the evidence of the active landslide � features observed at the site. Implicadons of these slope movemenu will affect all phasea of desipn, conatruction, and maintenance of developments on the site. The foilowinp report sections contain our detailed recommendatione repardinp feasibla development locationa,foundation desipn parameterc and construetion considerations,draina0e considerations,the driveway area retaininp wall and nvi�e/creek crossinp embankment, as well as peneral site preparation and fill placement. C, AGRA � Earth&Environmental Group