6.1.A. SR 12-18-2006 - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I I November 13, 2006 Project 06-507 A 2007 Street Reconstruction Irving A venue Area Improvements Elk River, Minnesota In using the above R-value for bituminous pavement design, it is essential that the ~~~gra_d~ _b_e_ c()nstruct~d ()(~ifoP?1_ soils _at a ~9i~tllr~C9me~t~~A~!lsity m ~ccorgance with Mn/DOT specification 2105 and capable of passing a test roll in accordance with Mn!DOT specification 2111. The native, undisturbed soils may need preparation (drying and compacting) to pass a proof roll. If the subgrade is not compacted, uniform and capable of passing a test roll, then we recommend the subgrade be scarified and recompacted or sub cut and geotextile fabric placed along with select granular material - - meeting Mn!DOT specification 3149. The top of subgrade should be compacted to_a minimum of 100% of standard proctor maximum density. The subgrade should be-sloped towards the edges to provide drainage. F. Closing Our work was performed for geotechnical purposes only and not to document the presence or extent of any contamination on the site. We can note that our crew did not detect any obvious contamination by sight or smell during drilling operations. However, human senses are limited in terms of contamination detection and, therefore, the lack of detection through human sensing does not preclude the possibility of the presence of contamination of the site. 'Th_~S_ r.~?o~ _r~J>~~sent~the_ ~esu_It ?~~ur sU~~ll!fac~ _in"es!i~a.t~o~and isnbased ()n_ information gathered at specific locations. Subsurface conditions can change a great deal over short horizontal distances. Also, the actual interface between strata will likely be a gradual transition rather than an abrupt change as represented on the boring logs. Geotechnical engineering is based extensively on opinion. . Therefore, the data contained Page 8