Materials (under evaluation) - Laserfiche WebLink

Ehkk Surficial fill was encountered in TP-8, located near the southeast corner of the property. The fill was encountered at the ground surface, extending ±1 foot below grade. The fill consists of medium dense silty gravel to gravelly silt with trace sand. Based on its location and apparent limited extent, we anticipate the fill could be side-cast material from construction of the adjacent, small substation. Snornhk A topsoil layer was encountered in most test pits extending to a depth of ±1 to 2 feet. The topsoil consists of low to medium plasticity silt or silt with some clay. It was typically dry to damp and stiff to very stiff at the time of the exploration. The topsoil is similar to the underlying alluvial silt (described below), but was distinguished primarily because of its blocky texture and scattered to abundant fine roots. Rhks Alluvial silt was encountered in all the test pits, directly below the ground surface or underlying the topsoil (or fill at TP-8). The silt stratum extended to the maximum exploration depth at TP-2 through TP-5, and TP-8 through TP-10 (up to ±12 feet below exiting grades). The upper portion of the silt is clayey with low to medium plasticity. Atterberg limits tests (described below) indicate the upper silty soil has a plasticity index (PI) ranging from 8 to 20 and corresponding USCS classification of ML or MH. The shallow silt was typically damp to moist and stiff to very stiff at the time of the investigation. In most test pits, the silt has lower plasticity with trace to some sand below depths ranging from ±4.5 to 8.5 feet. Silty sand or sandy silt was encountered in TP-5 and TP-8 below ±7 to 8 feet. R`mcxFq`udk`mcBnaakdr Dense sandy gravel and cobbles were encountered in TP-1, TP-6, and TP-7 below depths ranging from ±4.5 to 5.5 feet. Where encountered, the gravel stratum extended below the bottom of the explorations. Borings completed on adjacent properties (by others) indicate the gravel stratum extends to a depth of at least ±25 feet. Ground Water No seepage or ground water infiltration was encountered to the maximum depth of the current explorations. However moist conditions were typically noted at shallow depths in most test pits. Wet soil conditions were observed within the gravel stratum encountered below ±4.5 to 5.5 feet in TP-1, TP-6, and TP-7. We obtained well logs from borings drilled by others on adjacent properties to the north and south of the subject property. The logs from those borings indicate ground water was encountered at depths of ±9 to 10 feet for borings drilled in December 1991, when the ground water is expected to be shallower. Ground water was River Road Multi-Family Development April 30, 2018 Preliminary Geotechnical Investigation 3. Project 2171066 Eugene, Oregon Evergreen Housing Development Group, LLC