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Geotechnical Report 2020 PMP Street Improvements Arden Hills, Minnesota WSB Project No. 014297-000 Page 8 4.8 Construction Safety All excavations must comply with the requirements of OSHA 29 CFR, Part 1926, Subpart P “Excavations and Trenches”. This document states that excavation safety is the responsibility of the contractor. Reference to this OSHA requirement should be included in the job specifications. The responsibility to provide safe working conditions on this site, for earthwork, building construction, or any associated operations is solely that of the contractor. This responsibility is not borne in any manner by WSB. 4.9 Cold Weather Construction It is our understanding that construction is unlikely to occur during the winter months. However, if the construction does continue into the winter months we recommend the following guidelines. Only unfrozen fill should be used. Placement of fill must not be permitted on frozen soil. 4.10 Field Observation and Testing The soil conditions illustrated on the Logs of Test Borings in Appendix A are indicative of the conditions only at the boring locations. For this reason, we recommend that all excavations at this site be observed by a geotechnical engineer or technician prior to fill or backfill placement or construction of any structural elements to determine if the soils are capable of supporting the fill backfill and/or structural loads. These observations are necessary to judge if all unsuitable materials have been removed from within the planned construction area and an appropriate degree of lateral oversize has been provided. WSB also recommends a representative number of field density tests be taken in all engineered fill and backfill placed to aid in judging its suitability. Fill placement and compaction should be monitored and tested to determine that the resulting fill and backfill conforms to specified density, strength or compressibility requirements. Prior to use, any proposed fill and backfill material should be submitted to the WSB laboratory for testing to verify compliance with recommendations and project specifications. Dynamic Cone Penetrometer (DCP) tests can be completed in the aggregate base in lieu of density testing. W e recommend following MnDOT Specification 2211.3.D.2.c. WSB would be pleased to provide the necessary field observation, monitoring and testing services during construction. 4.11 Plan Review and Remarks The observations, recommendations and conclusions described in this report are based primarily on information provided to WSB, obtained from our subsurface exploration, our experience, several necessary assumptions and the scope of service developed for this project and are for the sole use of our client. W e recommend that WSB be retained to perform a review of final design drawing and specifications to evaluate that the geotechnical engineering report has not been misinterpreted. Should there be any changes in the design or location of the structures relat ed to this project or if there are any uncertainties in the report we should be notified. We would be pleased to review any project changes and modify the recommendations in this report (if necessary) or provide any clarification in writing. The entire report should be kept together; for example, boring logs should not be removed and placed in the specifications separately. The boring logs and related information included in this report are indicators of the subsurface conditions only at the specific locations indicated on the Soil Boring Exhibit and times noted on the Logs of Test Boring sheets in Appendix A. The subsurface conditions, including groundwater levels, at other locations on the site may differ significantly from conditions that existed at the time of sampling and at the boring locations.