7200 HARDESON RD 2016-01-01 MF Import

�� �� CNA Architecture Group 12 April 1991 W-7352 Page 6 groundwater originating as precipitation or surface flow. A perched condition should be expected within the random fill material on the site. it should be noted that groundwater conditions may fluctuate due to variations in precipitation, irrigation, alteration of run-off from sdjacent properties, and site utilization. 5.0 CONCLUSIONS ANQ RECOMMENDATIONS Based on our �ubsurface exploration program, the parcel is feasible for the proposed development from a geote�hnical standpoint, utilizing shallow foundations and conventional construction methods after removal and replacement of existing fill soils in the building pad. Uus tr the silty nature of the site soils, the site will be highly moisture sensitive and susceptible to disturbance. It is tharetore suggested ttiat the earthwork, site grading, pavement subgrade and footing preparation be performed during the dry summer months if at all possible. Special attention to wet weather construction techniques and the use of imported clean fill would be required othenvise. During wet weather, use of the silty onsite soils as fill would be di�cuit or impossible. 5.1 Site Preparation All building, pavement areas, and retaining structure locations should be stripped of all topsoil, existing debris, uncontrolled or i,incompacted fill and organics. Ccmplete removal of fill soils and organics, to native bearing soils is recommended within tlie building area, other structural areas, and extending at least one foot outside the building for each one foot of soil removed. Based on our test pit excavations and previously collected information, we estimate the stripping effort toremove fill and organics to be on the order of 7 to 17 or more feet, although deeper local areas may be encountered. For parking areas, partial over-excavation and/�r reworking of the fill material could be considered if the risk of some settlement, cracki ;g and warping of the surfaces can be tolerated. To broaden deflection over a wider ar� � a minimum 2 foot over-excavation can be accomplished into the fill soils. We then recorr�mend 2 feet of compacted "structural fill" be placed above the partially stripped subgrade if full depth fill removal is not carried out (see Section 5.2). In order to minimize pavement maintenance and future repair requirements, complete removai of fill soils and organics would be recommended. y. a a _ ', �� �.,IS ;' ;:` : �,;`;�+ _;„'�`:, _ _ - -� s::�r �` ' i' �?� '; ; , . �.e''�:-`�.�5:�,.'-:l� =-�,, �,�; � `.:y : ,�,�, �. � ��r � ��;��_,��:�.;�` , �-!� -. ..::�: ;6�