Report/subsurface exploration/geotechnical review

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AET#22-00173- Page 7 of 10 we recommend that the garage floor slab be constructed independent to the rest of the structure (i.e. not tied into the foundation or walls). This reduces the potential for heave to the rest of the structure if the frost susceptible soils below the garage slab were to freeze and heave. You have indicated that the garage will be designed to be heated. For- additional recommendations pertaining to moisture and vapor protection of floor slabs, we refer you to the attached standard sheet entitled "Floor Slab MoistureNapor Protection." Dewaterin� The excavation must be properly dewatered so that the base soils can be observed and tested, and to allow footing installation under dry conditions. The level of groundwater drawdown should be achieved before the excavation reaches the planned elevation, and maintained at least 2 feet below the lowest anticipated subgrade or subcut elevation. However, the water table should not be lowered more than necessary to provide a dry excavation, to reduce the risk of settlement of adjacent structures and utilities. It is the responsibility of the designers of the dewatering system to assess the effects of lowering the groundwater on adjacent structures and utilities. CONSTRUCTION CONSIDERATIONS Runoff Water and Groundwater in Excavation Based on the conditions found in our boring, it is our opinion that groundwater will be a factor that should be considered in the design and construction of the lift station and construction dewatering will be required. To allow observation of the excavation bottom, and to reduce the potential for soil disturbance and facilitate lift station placement and filling operations, we recommendation that all free-standing water within the excavation be removed prior to proceeding with construction.