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HR Green, Inc. Project B2204225 October 3, 2022 Page 7 C. Recommendations C.1. Design and Construction Discussion C.1.a. Introduction At the time of this report, the preferred trail alignment has not been decided. We understand the City of Arden Hills prefers the trail be constructed on the west side of Old Highway 10. C.1.b. Subgrade Preparation If schedule, site constraints or other issues prevent scarification and drying operations, the contractor may need to subcut some areas. We recommend the owner and contractor anticipate some removal and replacement of these soils with imported sand, aggregate base, or crushed rock. C.1.c. Reuse of On-Site Soils The existing, non-organic, debris-free, clayey fill soils are suitable for reuse as engineered fill below pedestrian trail pavement section. Portions of the existing fill may contain organic material, likely more than revealed by the borings. We do not recommend reusing existing fill that contains debris or organic material as structural fill. C.1.d. Site Drainage Some of the soils, such as silty sands, clayey sands and clay, will collect water from precipitation or if water drains to the site. We recommend the contractor remove any water that collects in work areas before performing further work. C.1.e. Construction Disturbance The contractor should note the on-site clayey soils are highly susceptible to disturbance, due to repeated construction traffic. Disturbance of these soils may cause areas that were previously prepared, or that were suitable for pavement or structure support, to become unstable and require moisture conditioning and compaction. Subcutting and replacing the disturbed material with crushed, coarse gravel, free of fines is also an alternative. The contractor should use means and methods to limit disturbance of the soils. 40