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28 certerra.com 4660 Main Street, Suite 100, Springfield, Oregon 97478 T: 541.393.6340 4.0 CONSTRUCTION CONSIDERATIONS Certerra should be retained to provide observation and testing of construction activities involved in the foundation, earthwork, and related activities of this project. Certerra cannot accept any responsibility for any conditions that deviate from those described in this report, nor for the performance of the foundations if not engaged to also provide construction observation for this project. 4.1 Drainage and Groundwater Considerations Water should not be allowed to collect in the foundation excavations or on prepared subgrades during construction. Positive site drainage should be maintained throughout construction activities. Undercut or excavated areas should be sloped toward one corner of the excavation to facilitate removal of any collected rainwater, groundwater, or surface runoff. The site grading plan should be developed to provide rapid drainage of surface water away from building areas and to inhibit infiltration of surface water around the perimeter of the building and beneath floor slabs. Stormwater runoff should be piped (tightlined) to an approved on-site private system or public storm drain system. 4.2 Excavations In Federal Register, Volume 54, No. 209 (October 1989), the United States Department of Labor, Occupational Safety and Health Administration (OSHA) amended its "Construction Standards for Excavations, 29 CFR, part 1926, Subpart P". This document and subsequent updates were issued to better ensure the safety of workmen entering trenches or excavations. It is mandated by this federal regulation that excavations, whether they be utility trenches, basement excavations or footing excavations, be constructed in accordance with the new OSHA guidelines. These regulations are strictly enforced and if they are not closely followed, the owner and the contractor could be liable for substantial penalties. The contractor is solely responsible for designing and constructing stable, temporary excavations and should shore, slope, or bench the sides of the excavations as required to maintain stability of both the excavation sides and bottom. The contractor's "responsible person", as defined in 29 CFR Part 1926, should evaluate the soil exposed in the excavations as part of the contractor's safety procedures. In no case should slope height, slope inclination, or excavation depth, including utility trench excavation depth, exceed those specified in local, state, and federal safety regulations. We are providing this information solely as a service to our client. Certerra does not assume responsibility for construction site safety or the contractor's compliance with local, state, and federal safety or other regulations.