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NTI' NORTHERN <br />ECHNO <br />TECNNOO <br />LOGIES,IIC <br />6160 Carmen Avenue East <br />Inver Grove Heights, MN 55076 <br />P:651.389.4191 F:651.389.4190 <br />www.NTIgeo.com <br />Dailey Companies <br />P. O. Box 490206 <br />Blaine, Minnesota 55449-0206 <br />Attention: Mr. Jay Thorson <br />Subject: Geotechnical Exploration and Engineering Review Summary <br />Ruffridge Johnson Equipment Company <br />Centerville, Minnesota <br />NTI Project No. 17.61877.100 <br />Dear Mr. Thorson, <br />Unearthing confidence - <br />March 21, 2017 <br />Northern Technologies, LLC (NTI) has been asked by the City of Centerville to provide a project <br />summary based on our geotechnical exploration and our understanding of the provided soil <br />improvement testing reports and documentation. This letter provides our summary. <br />Subsequent to the issuance of our initial report, additional documentation was provided to NTI by <br />the City of Centerville consisting of site field testing reports prepared by Twin City Testing <br />Corporation during the site's soil improvement activities. The provided documentation included <br />density tests (performed in the fill soils) and Dynamic Cone Penetrometer (DCP) tests (performed on <br />the base native soils below the fill materials) for Parcel C and only DCP tests (performed on the base <br />native soils below the fill materials) for Parcel B (see the attached soil test summary and the boring <br />and test location plan). Parcel C is the west half of the property and Parcel B is the east half of the <br />property. The majority of the project's proposed structure and the soil borings performed for this <br />project are located on Parcel B. <br />Based on the provided test reports, it appears that the fill may have been placed in a controlled <br />manner on Parcel C; however, since documentation of the placement of fill on Parcel B was not <br />provided, NTI still considers these fill soils to be undocumented and placement conditions to be <br />unknown. <br />Our soil borings encountered topsoil over fill extending to depths ranging from approximately 2.0 to <br />7.0 feet below the existing ground surface. The fill encountered at Borings SB -3 (located near the <br />southwest corner of the proposed structure) and SB -5 (located within the east parking area) <br />contained organic materials and/or organic soil layers at depths of approximately 4.5 feet below the <br />existing ground surface. Based on the results of our geotechnical investigation and the lack of fill <br />placement documentation for the Parcel B site, it is our opinion that in order to reduce risk of <br />settlement and the potential for subsequent structural damage, a complete soil correction to remove <br />the existing fill is recommended within the building pad footprint. <br />Piecision Fl-,i:LiEsse - GVstechruf t11 Klotclwls <br />F AI'l;Ej [3ISMAHC:K - GRAND FDRK5 M1N101 1N'Vf R GHEJVF HE 11; 111 S RAM SE Y HAP11)1:1TY S1471JX FA[ 15 <br />