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Subsurface Exploration Summary <br />NTI performed the subsurface exploration program on May 22, 2014 with a two -person crew and <br />a truck -mounted CME -55 drill rig. Samples were generally collected in accordance with ASTM <br />D1586 "Standard Test Method for Standard Penetration Testing (SPT) and Split -Barrel Sampling <br />of Soils." <br />The boring locations and depths were determined by NTI. Boring locations were staked in the <br />field by a representative of NTI. The borings terminated at a nominal depths of 10 to 20 feet <br />below the existing ground surface. The City of Ramsey provided ground surface elevations at <br />each of the soil boring locations. <br />Soil Conditions <br />Bituminous pavement thickness along the existing roadways ranged from 1 1/2 to 2 inches in the <br />soil borings. Aggregate base thickness ranged from 2 to 3 inches. Previously placed fill soils <br />generally consisting of sand (SP), silty sand (SM), clayey sand (SC), and sandy clay (CL) were <br />encountered below the pavement section. The relative density of the granular fill throughout the <br />project area was generally very loose to medium dense. The clay -based fill generally had a <br />medium consistency. <br />Native alluvial sand (SP) and clay (CL) were observed at boring termination depths. <br />Several non -typical conditions were also observed in several borings. Fill consisting of sandy <br />clay with trace organics was encountered in SB -1 ranging from 0 to 2 feet below pavement <br />section. The silty sand (SM) fill soil was wet from 2 to 4 feet below the ground surface boring <br />SB -2. The underlying native clay (CL) below the silty sand fill was generally soft. <br />Soft to medium high plasticity clay (CH) layers were encountered below the previously placed <br />fill in soil boring SB -2 from 11.5 feet to as much as 17 feet below existing grade. The <br />consistency of this material was soft. Table 2 summarizes the subsurface conditions for the <br />borings in the existing paved roadways. <br />Table 2: Subsurface Summary: Garnet Street & 168th Avenue <br />Boring <br />No. <br />Bituminous <br />Pavement <br />Thickness <br />(inches) <br />Aggregate <br />Base <br />Thickness <br />(inches) <br />Fill <br />Subgrade <br />Material <br />Native <br />Subgrade <br />Material <br />Depth of <br />Unsuitable Soil <br />(feet) <br />1 <br />1 1/2 <br />2 <br />CL, SP <br />SP <br />2 <br />2 <br />2 <br />2 <br />SM <br />CL, CH, SP <br />N/E <br />3 <br />2 <br />2 <br />SC <br />SM, CL <br />N/E <br />4 <br />2 <br />3 <br />SC, SM <br />SP -SM, CL <br />N/E <br />*N/E = Not Encountered <br />2 <br />