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~ `_ <br /> i <br /> ITCO ALLIED ENGINEERING C�. <br /> AN ALLIANCE OF INSTANT TESTfNG COMPANY AND QLL[ED TEST D ILLING <br /> Jobsite and Laboratory Testing, Geofechnrcal Services, Commercial, Residenfial and Municipal <br /> 7'I25 West 12fith Street, Suite#500 - Savage, MN 55378 <br /> Telephone: (952)890-736fi Fax: (952) 890-5883 <br /> March 11, 2014 <br /> Atlashomes Phone: 763-425-3333 <br /> 14450 - 117�'Avenue North Fax: 763-390-0039 <br /> Dayton, Minnesofa 55369 mark@atlashomesmn.com <br /> RE: 1565 Maple Place � <br /> Orono, Hennepin County, Minnesota <br /> As requested, a site visit was made on March 11, 2014 at 12:04 P.M, to evaluate and test soils for <br /> the construction of a full basement single-famify residence. The proposed build area is located at <br /> the middle of the 3 remaining lots within the tract. A subsurface geotechnical investigation#11036 <br /> conducted by A[fied Test Drilling Company indicates possible unsuitable soils within the <br /> development, to an average depth of 6 '/2 to 8 feet, with ground water elevations varying from 14 to <br /> 20 feet. <br /> At the time of the inspection, an area approximately 30 feet by 14 feet by 8 '/z feet deep had been <br /> excavated within the SW section of the proposed build area. Removed materials consisted of <br /> undocumented fill, containing {oamy soils, tree branches & root debris, wood, concrete, an isofated <br /> car tire, and a 10" zone of organically stained clay (Horizon "B" soil). The base of the excavation <br /> consisted of a wet, soft sandy clay, with a small isolated area of the Horizon "B" soil rerrzaining <br /> adjacent to the east wall of the excaWation. <br /> To assess the relative strength of the base soils, a 5/8�" inch diameter smooth probe was used at <br /> random to penetrate the excavation interior. With full body weight applied, the probes indicated <br /> medium/soft soils with probe penetration averaging 1 '/Z to 2 '/Z feet. Subgrade soil conditions were <br /> further evaluated by a 1 5/8'h inch diameter fluted hand auger probe put down excavation. The <br /> extracted cohesive soils were uniform in classification, and gained strength at depth. <br /> The load bearing capacity of the soils were evaluated by a dynamic cone penetrometer test <br /> conducted at the base of the excavation. The dynamic cone penetrometer (DCP), employs a eight <br /> kilogram (17.6 pound) hammer to drive a 20 millimeter diameter canica! pair�t into the soil, with the <br /> penetration recorded in millimeters per blow. From the DCP readings, a per blow, penetration <br /> average was recorded and a N-value derived. This N-value is an empirical relationship we hav� <br /> established to equate the dynamic cane data to the more familiar blows per foot (BPF) standard <br /> penetration sail boring test. <br />