900 PACIFIC AVE WOMEN AND CHILDREN PAVILLION 2018-01-02 MF Import

�I Providence Family Services Center 9-91 M-12723-0 August 25, 1999 Page 7 � IOur geotechnical laboratory tests revealed that the on-site scils have a fines(silt and clay)content on the order of 23 to 32 percent, and a moisture content on the order of 9 to 13 percent. We I interpret these soils to be currently near or above their optimum moisture contents,and to be highly sensitivetomoisturecontentvariations. TheenclosedlaboratoytestingsheetsgraphicaU�•r�esent our test results, and Table 3 summarizes these results. TABLE 3 LABORATORY TEST RESULTS FOR NON-0RGANIC ONSITE SOILS Sample lNoisture Gravel Sand SiltlClay i Soil Type and Source Depth Content Content Content Content (feet) (percent) (percent) (parcent) (percent) Upper SAND (B-10/S-4) 12'/:to 14 13 9 59 �2 I Weathered Till (B-10/S-5) 17'/: to 19 11 3 65 32 Glacial Till B-10/S-6 22'/�to 24 9 c19 58 23 ( 4.5 Groundwater Conditions ( At the time of drillirg (January 1999), none of our explorations encountered groundwater within their termination depths of 14 to 44 feet. Because our explorations were performed during an extended period of generally wetweather,groundwater conditions may closeiy represent the yearly ( high levels; somewhat lower levels probably occur during the summer and early fall months. However, perched groun�Hater may form atop the glacial till horizon during periods of heavy rainfall. It should also be noted that throughout the year,groundwater levels wouid likely fluctuate � in response to changing precipitation patterns, off-site construction activities, and site utilization. 4.6 Seismic Conditions � Based on our analysis of subsurface exploration logs and our review of published geologic maps, we interpret the on-site soil conditions to correspond to seismic soil profile type S-C as defined by Table 16-J of the 1997 Uniform Building Code (UBC). Curcent (1996) National Seismic Hazard ( Maps prepared by the U.S. Geological Survey indicate that a peak Cedrock site acceleration coefficient of about 0.28 is appropriate for an earthquake having a 10-percent probability of exceedance in 50 years,which corresponds to a retum interval of 475 years. According to Figure � 16-2 of the 1997 UBC, the site lies within seismic risk zone 3. If a future version of the UBC is to be used for structural design purposes,we can a�aist the project structural engineer in deveioping appropriate seismic criteria. I4.7 Environmental Conditlons Our on-site geotechnical explorations did not disclose any obvious indications of petroleum orother I environmental contaminants in the subsurface soils. However, because a specific assessment of on-site environrrsntal conditions was not included in our scope of work, no substantiated opinions can be drawn in regards to whether contaminants are present. I� 5 �S�OFOPROC'�99Pmiects�5eai0e��700Cs�.'.':]RoOmsonWrowEenceHosp�iip�woC ,Q I