1318 37TH ST 2018-01-02 MF Import

James Pirie ` JN 97072 March 19, 1997 Page 2 overly steep cut slopes along the southwestern side of the lot, at the edge of High Street. These cut slopes are about 10 feet tall and have inclinations of approximately 1:1 (Horizontal: Vertical). We observed no evidence of recent slope instability or significant soil erosion o:; the property at the time of our visits. No groundwater seepage was visible on the site slopes. However, the low area along 37th Street and Grand Avenue at the northern end of the site contained standing water. Development of the area surrounding the site is entirely residential. Single-family homes are situated above the slopes west of Grand Avenue and south of 38th Street. Houses are also located on the moderate slopes that drop east of the eastern alley. Immediately east of proposed Building 1 are the Rucker Village Townhomes. This is a recently completed development consisting of six h.o-story townhouse buildings. The finish floor elevations of the bottom floors of these buildings .sere estimated to be about 310 feet in the southernmost townhouse, dropping to about 306 feet in the northernmost townhouse. Subsurface The subsurface conditions were explored by excavating seven test pits at the approximate locations shown on the Site Exploration Plan, Plate 2. The field exploration program was based upon the proposed construction end required design criteria, the site topography and access, the subsurface conditions revealed during excavation, the scope of work outlined in our proposal, and the time and budget constraints. The test pits were excavated on February 20, 1997 with a rubber -tired backhoe. A geotechnical engineer from cur staff observed the excavation process, logged the test pits, and obtained representative samples of the soil encountered. "Grab" samples of selected subsurface soil were collected from the backhoe bucket. The Test Pit Logs are attached to this report as Plates 3 through 6. The test pits generally encountered similar subsurface conditions among the areas that were explored. Six to 12 inches of silty topsoil were found beneath the surface vegetation. However, in Test Pit 3, the topsoil was overlain by about 18 inches of slightly silty, gravelly, sand fill. Beneath the topsoil layer, the test pits all revealed native, gravelly, silty sand. This native sand became dense within several inches of the topsoil in Test Pits 1, 2, and 7. In the remaining explorations, the native, silty sands were loose to medium -dense for one to 5 feet below the topsoil before becoming dense. Laboratory tests on three selected samples of the native, silty sands reveaied in - situ moisture contents of 10.5 to 11.2 percent. The final logs represent our interpretations of the field logs and laboratory tests. The stratification lines on the logs represent the approximate boundaries between soil types at the exploration locations. The actual transition between soil types may be gradual, and subsurface conditions can vary between exploration locations. The logs provide specific subsurface information only at the locations tested. The relative densities and moisture descriptions indicated on the test pit logs are interpretive descriptions based on the conditions observed during excavation. The compaction of backfill was not in the scope of our services. Loose soil will therefore be found in the area of the test pits. If this presents a problem, the backfill will need to be removed and replaced with structural fill during construction. GEOTECH CONSULTANTS, INC. K