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AMERICAN ENGINEERING TESTING, INC. AET Project No. 22-00012 <br /> Underlying the fill in borings EP-4 and EP-24, we found a possible buried topsoil layer <br /> consisting of black lean clay with organics, extending to a depth of 4.5 feet below grade. <br /> Below the surficial topsoil, pavement, fill, and/or buried topsoil, we encountered interbedded <br /> strata of fine alluvium, coarse alluvium, and till to the boring termination depths. The cohesive <br /> and semi-cohesive soils were of very soft to stiff consistency, with N-values ranging from 0 <br /> ("weight of hammer") to 14; the water contents ranged from 18% to 41%. The granular soils <br /> were very loose to medium dense,with N-values ranging from 2 to 24. <br /> 5.2.2 Test Pits <br /> The soils that we observed in our test pits are generally consistent with the soils that we <br /> encountered in our borings on this site. In nine of the 15 test pits, we observed a surficial layer <br /> of topsoil consisting of a mixture of dark brown and black clay, silt and sand, to depths of 1.5 <br /> feet to 3 feet below grade. Below the topsoil in some of these test pits, we observed a layer of <br /> relatively soft gray lean clay and silt with black organic layers and staining extending about 0.5 <br /> feet to 2 feet below the topsoil layer. <br /> In the remaining test pits, we found a surficial layer of fill extending to depths of 3 feet to 6 feet <br /> below grade. The existing fill consisted of a mixture of dark brown and black lean clay, silt, <br /> clayey sand and silty sand; some of the fill contained organics and debris. <br /> In Test Pit 1, we observed an old masonry foundation wall at the edge of the test pit. In Test Pits <br /> 2 and 11, we observed an old clay pipe running through each excavation. In Test Pit 5, we found <br /> a relatively deep pocket of fill (about 6 feet deep) that contained debris such as large pieces of <br /> bituminous and an old corrugated metal culvert. The depth of fill increased rapidly across the <br /> exposed pit, and it appeared that the fill was placed in an excavation with near-vertical sidewalls. <br /> It is unknown if this was an old borrow pit or an excavation for an underground utility. After <br /> encountering the relatively deep fill in Test Pit 5,we directed the excavator to dig a test pit about <br /> 30 feet west (Test Pit 5A) and one about 25 feet south (Test Pit 5B) of Test Pit 5 to better assess <br /> Page 7 of 28 <br />