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Brookview Estates Reconstruction <br /> Ramsey, Minnesota <br />NTI Project No. 18.MSP06855.000 <br /> <br />If imported fill is required in paved areas, it should consist of debris-free, non-organic, mineral soil <br />similar in composition to the subgrade soils encountered in the surrounding areas. If sand is imported <br />into areas that are underlain by relatively impervious fine-grained soils, the sand layer must be drained <br />with drain tile in order to prevent frost heave from water trapped within the imported sand layer <br />during freezing temperatures. Individual lifts of engineered fill should be tempered for moisture <br />content, placed, and compacted as noted in section <br />in Appendix B of this report. <br />3.0Excavation Stability <br />Excavation depth and sidewall inclination should not exceed those specified in local, state, or federal <br />regulations. Excavations may need to be widened and sloped, or temporarily braced, to maintain or <br />develop a safe work environment. Contractors must comply with local, state, and federal safety <br />regulations including current OSHA excavation and trench safety standards. Temporary shoring must <br />be designed in accordance with applicable regulatory requirements. <br />3.1Engineered Fill & Winter Construction <br />The silt and clay laden soils encountered at the project locations will be susceptible to freezing if not <br />provided adequate drainage, insulation, or coverage. Frozen soil should not be used as backfill. When <br />the ambient air temperature falls below freezing for an extended period of time, frost forms, and soil <br />near the surface grade expands. Settlement of the fill may occur as the frozen soils thaw. <br />If frost penetrates the soil prior to paving, soils must be thawed, scarified, and re-compacted as <br />recommended in this report. Subgrade soils should be inspected prior to paving to verify frozen <br />conditions are not present. <br />Closure <br />4.0 <br />As the widely spaced, small diameter borings provide only a limited amount of data regarding the <br />existing fill, the existing fill may contain soft zones, debris or significantly greater amounts of unsuitable <br />materials than could be reasonably inferred from the boring information. Unsuitable materials may not <br />be discovered during construction and may remain buried within the fill below the pavement, resulting <br />in greater than anticipated settlements of the pavement. These risks cannot be eliminated without <br />completely removing the fill, but can be reduced by thorough exploration and testing during site <br />preparation and construction. <br />Our conclusions and recommendations are predicated on observation and testing of the earthwork <br />directed by Geotechnical Engineer of Record. Our opinions are based on data assumed representative <br />of the project area. However, the area coverage of borings in relation to the entire project is very <br />small. For this and other reasons, we do not warrant conditions below the depth of our borings, or that <br />the strata logged from our borings are necessarily typical of the site. Deviations from our <br />recommendations by plans, written specifications, or field applications shall relieve us of responsibility <br />unless our written concurrence with such deviations has been established. <br /> <br />Page 6 of 7 <br /> <br />