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Alpine Drive —Street Improvements <br />Ramsey, Minnesota <br />NTI Project No. 16.61770.100 <br />Table 1 summarizes the encountered subsurface conditions for this project area. <br />Table 1: Pavement and Subgrade Summary' <br />Alpine Drive <br />Bituminous Apparent <br />Pavement Aggregate Base Fill Subgrade Native Subgrade <br />Boring No. Thickness' (inches) Thickness3 (inches) Material4 Material <br />A-1 3.5 <br />None <br />A-2 3.5 20.0 <br />SP-SM SP-SM <br />SP-SM SP-SM <br />A-3 4.5 None SP-SM SP-SM <br />A-45 <br />4.8 24.0 <br />SP-SM SP-SM <br />A-5 4.8 4.5 <br />SP-SC, SC SP-SM <br />A-6 4.5 None SP-SM SP-SM <br />A-7 3.8 2.5 <br />SP-SM SP-SM <br />A-8 4.0 None SP-SM SP <br />A-9 3.5 None SP-SM SP-SM <br />A-105 <br />5.0 3.0 <br />A-11 <br />SP-SM SP-SM <br />4.5 None SP-SM SP-SM <br />A-12 4.5 None SP-SM SP-SM <br />A-13 4.8 None SP-SM SP-SM <br />1. Table summary is a generalization of subsurface conditions at the individual soil boring locations only. They may not <br />reflect variations in subsurface strata occurring on site between boring locations. The general geologic origin of <br />retained soil samples is listed on the boring logs. <br />2. Measured thickness of the pavement core. <br />3. Apparent aggregate base thickness, at time of our fieldwork, by visual inspection only and is not meant to confer <br />conformance with DOT specifications. <br />4. Undocumented fill soils. <br />5. Pavement core thickness may not be representative due to crumbling during coring process. <br />GROUNDWATER AND GROUNDWATER CONTROL <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. <br />Depending upon elevations of underground utilities, groundwater may be an issue during construction. <br />It should be noted that if excavations are proposed below the groundwater level, the granular nature of <br />the majority of the on -site soils will likely result in significant volumes of water entering the excavations <br />unless proper dewatering measures are implemented. Well points embedded into the underlying sands <br />will likely be the most suitable method for controlling excess water in deeper excavations. If dewatering <br />is needed during construction, we recommend that the groundwater be maintained a minimum of 2 <br />feet below the bottom of the excavation. <br />Page 3 of 8 <br />