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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 />a rate of one test per 200 linear feet on the finished roadway subgrade and aggregate base layer. <br />Embankment/ Road Fill: <br />The on -site soils consisting of fine grained, poorly graded sand (SP, SP-SM, SM) are considered <br />excellent material for use as roadway subgrade material. These soils are easy to compact using <br />vibratory compaction equipment near their optimum moisture contents. <br />We recommend that any imported fill and utility trench backfill material consist of mineral soils <br />meeting the requirements specified below. No organic soils, roots, stumps, logs, brush, etc. <br />should be used as structural fill below any utility structure or pavement section. We recommend <br />that all fill and utility trench backfill material be free of soft, wet, or frozen soils, highly <br />expansive soils, rubble, debris, and rocks in excess of 6 inches in diameter. The fill material <br />should be as uniform as possible both in composition and moisture content. <br />We recommend that all embankment fill material be placed in 12-inch loose lifts and compacted <br />to a minimum of 95% of standard proctor maximum density (ASTM D698). Any fill placed in <br />the top 3 feet of the road subgrade should be compacted to at least 100% of standard proctor <br />maximum density. All fill material should be compacted at a moisture content within plus 2% or <br />minus 3 % of the optimum moisture as determined by a standard proctor. We recommend <br />compaction tests be taken at a minimum rate of one test per two feet of fill per 200 linear feet of <br />roadway subgrade, and aggregate base material. <br />E. Pavement Recommendations <br />The poorly graded sand (SP, SP-SM, SM) outwash soils on site this site are classified as A-3 <br />soils in accordance with the American Association of State Highway Transportation Officials <br />(AASHTO) classification system. A-3 soils are rated as excellent material for use as roadway <br />subgrade material. Without benefit of a laboratory R-value determination and based on Mn/Dot <br />guidelines, we recommend an R-value of 70 be assumed for the onsite soils. <br />Page 7 <br />