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August 8, 2023 <br />ITT Project 23-192 <br />City Project 24-12 <br />Juniper Woods 1-3 Street Reconstruction <br />Ramsey, Minnesota <br />C. Engineering Review <br />Discussion: <br />The soils encountered near the surface on this site are predominantly fine grained silty sand (SM), <br />poorly graded sand with silt (SP-SM), and poorly graded sands (SP). They appear to mostly be <br />outwash materials. The native sands (SP, SP-SM, SM) are considered excellent material for use as <br />roadway subgrade material and for bituminous pavement support. <br />Based on our observation, it appears the roadway embankment was stable through the entire <br />project area. Unless it is known that there is some issue in the embankment in the project area, it is <br />our opinion that the existing roadway embankment can remain in place. <br />D. Recommendations <br />The following recommendations are based on our understanding of the proposed project. If our <br />understanding of the project is not accurate or if changes are made to the project scope, please <br />inform us so that our recommendations can be amended, if necessary. We have included <br />recommendations regarding earthwork and construction that may help in cost estimates and aid in <br />design. We should be allowed to review the proposed construction plans to provide further detailed <br />recommendations, if necessary. Without the opportunity to review the final construction plans, the <br />recommendations made in this report may no longer be valid. <br />Utility Installation: <br />We recommend that all utility pipes lay in non -organic mineral soils capable of supporting the <br />pipes. Excessive over -excavation beneath the pipes should be avoided. We recommend that 2 to <br />6 inches of granular bedding material be placed and compacted around the pipe to aid in aligning <br />the pipe for line and grade. The natural sand (SP) soils appear suitable for this purpose. <br />Compaction should be done very carefully by hand to prevent the pipe from shifting. We <br />recommend that the backfill be compacted with a vibratory sheep's foot roller after the backfill is <br />2 feet above the top of the pipe. Vibratory compaction should only be used on clean sands or <br />silty sands at or below optimum moisture. <br />We recommend that excavations slope at a 1.5:1 (horizontal: vertical) ratio from the bottom of <br />Page 5 <br />