6.1.B. 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 29, 2006 .. .. ... -- . Pmject 06-507B 2007 Street Reconstruction Deerfield 3rd Addition Improvements Elk River, Minnesota Based on an assumed R-value of30, we recommend the follm.ving bituminous pavement section for 100'Il-volume, residential streets: . - - - - - . . - .- - -. . - - - Thickness Course/Description G.E. 1.5" Mn/DOT 2360 L V-3 Wear Course 3.4" 2.0" Mn/DOT 2360 LV-3 Non-Wear Course 4.5" 8.0" Mn/DOT 3138 Class 5 or 6 Aggregate Base 8.0" 12.0" Mn/DOT 3149 Select Granular Borrow 6.0" 23.5" TOTAL 21.9" In using the above R-value for bituminous pavement design, it is essential that the .. - . -. - -- -. -... - - - .. - - - -- --. . - .. - - . .. - - . .. - - - - -- - - - - - - - - -- - - -- -- - - - -. - -.. - -- - - - - -.. - - --. .. - - - -- - - - subgrade be constructed of uniform soils at a moisture content and density in accordance 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 sub grade should be compacted to a ~_l!_lll_~~.!~O_~of.~t~~ard.pr()~tor_I?~~!Il.~~~s~o/..._ .._ _.___... n.n _._ _.._..___ The subgrade should be sloped towards the edges to provide drainage. We recommend installing subsurface drain tile in the granular layer to aid in drainage. We recommend the drain tile consist of a 4-inch perforated pvc pipe wrapped in filter fabric (sock type). The drain tile should be installed in the granular borrow behind the curb. Page 8