3214 BROADWAY BROADWAY KINECT APARTMENTS 2021-08-11

I • = American Property Development ES-0599.06 January 22, 2015 Page 5 • Updated June 9, 2016 • • With respect to adjacent property surcharge loading on the shoring system, further assessment • of adjacent building structures and foundation elevations relative to the shoring system and foundation walls will be needed, as appropriate, based on the final siting and design finish floor • elevation of the building. For purposes of this study, we have provided preliminary surcharge • values for design of temporary shoring and permanent foundations walls, as appropriate. • As previously, discussed, localized zones of groundwater seepage could be encountered. As • such, groundwater seepage could be encountered in the proposed excavation which is anticipated to be advanced to depths of approximately 18 to 25 feet below existing grades. The • presence of groundwater seepage in deeper utility excavations should also be anticipated. • al This geotechnical engineering study has been prepared for the exclusive use of American ' Property Development and their representatives. The study has been prepared specifically for the subject project. No warranty, expressed or implied, is made. This study has been prepared • in a manner consistent with the level of care and skill ordinarily exercised by other members of • the profession currently practicing under similar conditions in this area. • Site Preparation and Earthwork • • The primary geotechnical considerations with respect to earthwork are related to the proposed • building's excavation, temporary slope construction, temporary excavation support, and foundation subgrade preparation. The soils encountered in the building excavations should • largely consist of dense to very dense silty sand deposits. These soils should generally be • suitable for use as structural backfill, where needed. The native soils can be characterized as • having a generally moderate sensitivity to moisture. Therefore, if the soils are exposed to • excessive moisture, successful placement and compaction of the soil may be difficult. • Excavations As excavation of the proposed building progresses, the soil relative density should generally increase and is expected to exhibit good stability in open cut excavations. Overall stability of • the excavation is anticipated to be good, provided appropriate means for sloping and shoring • the excavation are utilized. Based on the soil conditions observed at the test sites, the • following allowable temporary slope inclinations can be used: • • Upper 4 Feet of Excavation 1 H:1 V (Horizontal:Vertical) • • • Below 4 Feet 0.5H:1V to 0.75H:1V • The geotechnical engineer should observe the excavation and assess the allowable temporary slope inclination based on the soil and groundwater conditions exposed in the excavation. • Supplement recommendations for sloping the excavation may be made by the geotechnical • engineer based on conditions observed. • With respect to temporary shoring, recommendations are provided in the Shoring Recommendations section of this study. • Earth Solutions NW, LLC • •