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October 7, 2024 <br />ITT Project 24-327 <br />Various Gravel Roads <br />IP 25-07 <br />Ramsey, Minnesota <br />C. Engineering Review <br />Discussion: <br />We understand the streets will be paved with a bituminous surface. We assume there will be little <br />line or grade adjustments to the streets. We assume there will only be slight grading of the existing <br />aggregate, and adding some aggregate needed to prepare the surface for paving. <br />The peat (PT) and organic silt (OL) encountered on Xenolith Street NW in Area A are not suitable <br />for pavement subgrade and pavement support. They are very susceptible to settlement and <br />movement. To reduce the amount of settlement and differential movement, we recommend using a <br />geogrid under the aggregate to provide additional support for the pavement. <br />Based on our observation, it appears the roadway embankment through the wetland area on <br />Xenolith Street NW was stable. Unless there is going to be a change in grade of more than 1 foot <br />during construction, or if it is known that there is some issue in the embankment in this area, it is <br />our opinion that the embankment should remain in place. <br />The sandy soils encountered near the surface on the rest of the sites are predominantly fine <br />grained, silty sands (SM), poorly graded sands with silt (SP-SM) and poorly graded sands (SP). <br />They appear to mostly be outwash materials. The native sands (SM, SP-SM, SP) are considered <br />excellent material for use as roadway subgrade material and for bituminous pavement support. <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 />Embankment/ Road Fill: <br />The on -site soils consisting of fine grained, poorly graded sand (SP), poorly graded sand with silt <br />Page 7 <br />