7818 LARIMER RD B Geotech Report 2022-10-25

CONCRETE CONSTRUCTION Concrete sidewalks and any other exterior concrete flatwork around the proposed structure may experience some differential movement and cracking. While it is not likely that the exterior flatworks can be economically protected from distress, we recommend following techniques to reduce the potential long-term movement: • Scarify and re -compact at least 12 inches of subgrade material located immediately beneath structures. • Avoid landscape irrigation adjacent to structures. • Thicken or structurally reinforce the structures. We recommend Type 1-11 cement for all concrete in contact with the soil on this site. Calcium chloride should not be added. Concrete must be protected from low temperatures and properly cured. LIMITATIONS Historically, with construction in hilly and seismic areas such as the site vicinity, there is an inherent risk associated with ground movement and/or settlements and related structural damage due to an earthquake or otherwise. Although there was no active local or global landsliding observed within the proposed construction area at this time, the owner is completely responsible for taking all risks associated with any future potential for instability at the site or in the site vicinity. Although there was no global slope instability observed in the immediate vicinity of the proposed construction area, the potential for future slope failure associated with movement of the global/ancient landslide and related local slope movement is low and the owner is responsible for any risks associated with any future potential for instability at the site or in the site vicinity. It should be noted that the detailed evaluation of the impact of any ancient or global landslides in the site vicinity area was beyond our scope of services. Since this report and recommendations contained herein have been prepared to maintain a low degree of risk for future structural damage, all our recommendations should be strictly followed. Recommendations contained in this report are based on our field observations and subsurface explorations, limited laboratory evaluation, and our present knowledge of the proposed construction. It is possible that soil conditions could vary between or beyond the points explored. If soil conditions are encountered during construction that differ from those described herein, we should be notified so that we can review and make any supplemental recommendations necessary. If the scope of the proposed construction, including the proposed loads or structural Proposed Construction Project No: 0470-WA18 January 24, 2019 Page No: 15 of 17