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Jo <br />Alpine Drive — Street Improvements <br />Ramsey, Minnesota <br />NTI Project No. 16.61770.100 <br />SUBSURFACE EXPLORATION SUMMARY <br />NTI performed the subsurface exploration program on November 7 2016 with a two -person crew using a <br />truck -mounted CME-55 drill rig. Samples were generally collected in accordance with ASTM D 1586 <br />"Standard Test Method for Standard Penetration Testing (SPT) and Split -Barrel Sampling of Soils." <br />The boring locations and depths were determined by a representative with the City of Ramsey. The <br />boring locations were staked in the field by NTI. The borings terminated at nominal depths 11.0 feet <br />below the existing pavement surface. . <br />Elevations were not provided to NTI, therefore, NTI has assumed a ground surface elevation of 100.0 <br />feet for each of the boring locations. Please refer to the Boring Location Diagram, the Boring Logs in <br />Appendix C, and the Pavement Core Photographs in Appendix D. <br />Alpine Drive — (Borings A-1 through A-13) <br />Bituminous pavement thickness within this roadway area ranged from approximately 3.5 to 5.0 inches at <br />the boring locations. Apparent aggregate base was not observed at the majority of the borings. As <br />exceptions, apparent aggregate base was observed at Boring A-2, A-4, A-5, A-7, and A-10 locations and <br />varied in thickness from approximately 2.5 to 24.0 inches. Occasional cobbles and hard drilling <br />conditions were encountered at Boring A-6, A-7, A-9, A-10, A-12 and A-13 locations. <br />Previously placed fill soils, generally consisting of poorly graded sand with silt and poorly graded sand <br />with silt and gravel (SP-SM), poorly graded sand with clay (SP-SC) and clayey sand (SC), were <br />encountered extending to depths ranging from approximately 3.0 to 9.5 feet below the top of <br />pavement. <br />Native alluvial soils consisting of poorly graded sand (SP) and poorly graded sand with silt (SP-SM) were <br />commonly observed extending to the boring termination depths. Varying amounts of gravel were <br />encountered throughout the boring locations. <br />Groundwater was observed in the boreholes at Borings A-5 and A-9 locations at the time of drilling at <br />depths of 10.0 and 10.5 feet respectively. Please refer to the boring logs included in the appendices. <br />Page 2 of 8 <br />