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North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 9 <br />about 2 to 7 feet, which correspond to elevations of about 908 to 919 feet. The attached Log of Boring <br />sheets in the Appendix also include this information and additional details. <br />The groundwater levels were highly variable; therefore, it is our opinion that some of the groundwater <br />observed in the borings is perched in permeable sand layers overlying slower draining clay layers. <br />Excavation trenches for utility installation will likely intercept some of these permeable layers creating <br />difficult backfilling conditions. Once the site grading and utility construction is complete, we expect some <br />of the perched water conditions of the site may change. <br />The contractor should immediately remove any collected water within the excavations to facilitate <br />construction and proper backfilling. Project planning should include temporary sumps and pumps for <br />excavations in low -permeability soils, such as clays and silts. Dewatering of high -permeability soils <br />(e.g., sands) from within the excavation with conventional pumps has the potential to loosen the soils, <br />due to upward flow, and we recommend that well points or dewatering wells be used in these areas. <br />To further evaluate the groundwater conditions on this site, additional soil borings should be completed <br />and piezometers should be installed and monitored. This additional groundwater data would assist in <br />establishing the below grade parking levels of the apartment and senior living buildings. It will also assist <br />with designing the below -grade pool. <br />C.1.d. Additional Evaluation <br />This draft report assumes that the buildings will be supported by spread footing foundations designed for <br />a maximum net allowable bearing pressure of 3,000 pounds per square foot (psf). As design of the <br />development progresses and the building floor grades and building loads are established, we recommend <br />completing additional soil borings to determine if a higher soil bearing pressure is feasible. <br />C.2. Site Grading and Subgrade Preparation <br />C.2.a. Building Subgrade Excavations <br />We recommend soil corrections to remove any unsuitable materials from the building footprint and oversize <br />area prior to construction. We define unsuitable materials as any existing fill, frozen materials, topsoil, <br />organic soils, existing utilities, building debris, pavements, and/or soft or very loose soils. Table 7 shows the <br />anticipated soil correction excavation depths and associated bottom elevations for each of the borings. We <br />have assumed that structures will be constructed at each boring location. If structures are not planned at <br />individual boring locations, the depth of soil correction work could be reduced. <br />BRAUN <br />INTERTEC <br />