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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 />.1 <br /> <br />November 13, 2006 <br />Project 06-507 A <br />2007 Street Reconstruction <br />Irving A venue Area Improvements <br />Elk River, Minnesota <br /> <br />B. Exploration Program <br /> <br />Fifteen (15) 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 i/2 feet using- a 2-iIich O.D. split-spoon sampler in accordance with the <br />American Society for Testing and Materials (ASTM D1586). Standard penetration 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 />re-quireli -ro--drive1he samp-Ier12 -inches-is kn-own- as the- standard- pe-netrafiOnl"esistan-ce- orN- <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. SOIne <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 />All of the borings were conducted on existing bituminous paved streets. The borings all <br />ep.~q~nt~~eg__1;>i~o~~__tQ _4~pfus _Qf ~:_Q _t9 4_~5. jp:~lJ.~s_~ft~ggreg~te_p~~ t9~~pth$ _Q(3.0 <br />to 7.5 inches. <br /> <br />Below the pavement, the borings generally encountered fme to medium grained poorly <br />graded sand with silt (SP-SM) and clean, poorly graded sand (SP) to termination. Boring <br />B-2 encountered some silty sand (SM) with layers of clayey sand (SC) from 4 feet to 7.5 <br />feet. Most of the sand encountered in the shallow borings was likely fill. No organic soils <br />or other unsuitable material was encountered. <br /> <br />Penetration Test Results: <br />The blow counts in the sand soils ranged from 2 to 15, which are low to moderate, <br />indicating they are in a loose to medium dense condition. Refusal of the spoon or auger did <br />not occur in any of the borings and the drilling was relatively easy in the all of the borings. <br /> <br />Page 3 <br />