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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />November 29,2006 <br />Project 06-507B <br />2007 Street Reconstruction <br />Deerfield 3rd Addition Improvements <br />Elk River, Minnesota <br /> <br />moderate limitations for development of local streets. <br /> <br />B~ ~xplo~ati~~_ ?_,:"~g~a~ <br /> <br />Twenty-two (22) split-spoon soil borings were conducted on this project. The borings were <br />advanced to depths of 4 to 10 feet using a 3 1/4 inch I.D. hollow stem auger. Samples were <br />obtained every 2 1/2 feet using a 2-inch O.D. split-spoon sampler in accordance with the <br />American-Sodety foyTestingana Matenals (ASTM Dt586): Stafiaafd"penetratloli" values ---- <br />(N-values) were obtained at each sample interval by driving the sampler into the soil using a <br />140-pound hammer falling 30 inches. After an initial set of 6 inches, the number of blows <br />required to drive the sampler 12 inches is known as the standard penetration resistance or N- <br />value. Where the sampler can not be driven-at least 6 inches by 50 blows of the hammer, the <br />total number of blows as well as the distance driven is reported on the boring logs. __ <br /> <br />Groundwater levels were noted during drilling and immediately after completion. The holes <br />were backfilled with the auger cuttings and patched with bituminous cold patch. Some <br />settlement of the bore holes may be expected. All of the borings were conducted with a truck <br />mounted rig. The boring locations were staked by us. <br /> <br />Exploration Results: <br /> <br />All of the borings were conducted on existing bituminous paved streets. The borings <br />encountered bituminous to depths of2.0 to 4.5 inches and aggregate base to depths of3.0 <br />to 7.0 inches. The bituminous depth was 8.0 inches in boring B-16, which was an area that <br />had been overlaid. <br /> <br />Below the pavement, the borings generally encountered fine to medium grained silty sand <br />(SM) glacial till soils. Borings B-1, B-7, B-8, B-I0, B-20 and B-21 encountered outwash <br />SCll1<fS_ _c?ns~st~~_?f ~ltle ~~~~d~_ p~?~ly waded _ san~ ~~~. silt (S~~_S~! "an~ c~eaIl~po~~ly <br />graded sand (SP) to termination. Boring B-1 encountered some silt layers :from 4 feet to 5 <br />feet. Boring B-14 encountered silty-clayey sand (Se-SM) to termination. Boring B-16 <br />encountered silty-clayey sand (SC-SM) to 7.0 feet, followed by silt (ML) to 10 feet and <br />silty sand (SM) to termination. Boring B-18 encountered clayey sand (SC) to termination. <br /> <br />Page 3 <br /> <br />I <br />