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' <br /> � - - � <br /> GEOTECHNICAL EXPLOR.ATION AND REVIEW <br /> ' FOR <br /> ORONO SALT STORAGE BUII�DING <br /> HENNEPIN COUNTY DEPT. OF TRANSPORTATION <br /> I 3880 SHORELINE DRNE <br /> ORONO, I��NNESOTA <br /> ' AET #20-01080 <br /> ' SiJMTVIARY <br /> se <br /> ' Construction of an unheated salt storage building is proposed at the referenced address in Orono, <br /> Minnesota. The purpose of our work on this project was to obtain subsurface information and <br /> , prepare a geotechnical engineering report. <br /> Sco e <br /> To accomplish the above purpose, we were authorized by Mr. Tom Bravo from Hennepin County <br /> 1 to drill six penetradon test borings, perform laboratory testing, and furnish a geotechnical <br /> engineering report. <br /> ' Fin s <br /> �s indicate a profile consisting of about 2' to 6' of fill over interbedded layers of <br /> ' naturally deposited alluvial and glacial ti11 soils. Fill depths may be greater because some of the <br /> soils are classified as "Alluvium or Fill" and "Till or Fill" and it could not determined from the _ <br /> samples whether they were previously placed as fill or ff they are naturally deposited. Ground <br /> rwater was measured in four of the six borings, at depths of about 18' to 21' below the surface. <br /> , Recommendations . <br /> These recommendations are condensed for your convenience. Study our entire report for detailed <br /> recommendations. <br /> � • The r sed building can be supported by conventional spread footings. Because of the loose <br /> P � <br /> and soft condition of the soils near footing grades, we recommend using an allowable�soil <br /> � bearing pressure of up to 2,000 pounds per square foot (psfl to design the footings. <br /> • The foundation excavations should extend through all fill to the underlying naturally deposited <br /> ' alluvial and glacial till soils. In the areas where soft till or alluvial clays and clayey sands will . <br /> be exposed(such as near Borings#3, #4, #5 and#6), we recoIInnencl an additional subcut of , <br /> at least one footing width below the design footing grades. <br /> ' i` <br /> • Further observation of the "Alluvium or Fill" a�d "Till or Fill" soils should be performed to <br /> evaluate their origin. If these soils are judged to be previously placed fill, they should be ' <br /> ' removed from below all foundations. - <br /> � <br />