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Bolton & Menk, Inc. <br />Project B2204011.00 <br />April 20, 2023 <br />Page 2 <br /> <br /> <br />Table 1. Subsurface Profile Summary <br />Strata <br />Soil Type - <br />ASTM <br />Classification Range of N-Values Commentary and Details <br />Pavement <br />section --- --- <br />ƒ Bituminous thickness was 3 1/2 to 4 inches. <br />ƒ Apparent Aggregate Base thickness was about <br />6 to 7 inches. <br />ƒ Overall thickness was about 10 to 10 1/2 inches. <br />Fill SC 3 to 8 <br />ƒ Moisture condition was generally moist. <br />ƒ Extended to a depth of about 7 feet below <br />existing grades at each boring location. <br />Glacial <br />Till CL 4 to 14 <br />ƒ Moisture condition generally moist. <br />ƒ Generally in a soft to medium consistency to a <br />depth of 10 to 12 feet. <br />ƒ Variable gravel content. <br /> <br /> <br />For simplicity in this report, we define fill to mean existing, uncontrolled or undocumented fill. <br /> <br />Groundwater <br /> <br />We did not observe groundwater while performing our borings. Groundwater may take days or longer to <br />reach equilibrium in the boreholes and we immediately backfilled the boreholes, in accordance with our <br />scope of work. If the project team identifies a need for more accurate determination of groundwater <br />depth, we can install piezometers. Project planning should anticipate seasonal and annual fluctuations of <br />groundwater. <br /> <br />Basis for Recommendations <br /> <br />Reuse of On-Site Soils <br />The soils encountered within the borings are suitable for reuse as engineered fill. Soils with organic <br />contents greater than 5 percent, if encountered, should not be reused as fill. This may result in the <br />importing of soils to re-establish subgrade elevations. <br /> <br />Utility Installation and Invert Elevations <br />We anticipate utility inverts will be generally within 10 feet of existing grades. The soils at anticipated <br />invert elevations generally appear suitable for support of utilities and consist mainly of native glacial till <br />soils. However, soft silts or clays may not be suitable for pipe or structure support when excavated. <br />Additional subcutting may be required to support utilities disturbed by groundwater or construction <br />activities.