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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 />the excavation to the surface. Stockpiled material should be kept at least 2 feet from the edge of <br />the excavation. This is the minimum required by OSHA. We recommend all construction <br />vehicles be kept at least 5 feet from the edge of the excavation. An escape ladder should be <br />provided at all times while workers are in the excavation. All excavations must meet OSHA <br />standards (29 CFR1926). <br />Trench Backfill: <br />The on -site soils consisting of poorly graded sands (SP, SP-SM, SM) are considered excellent for <br />use as utility trench backfill. These soils are generally easy to work with and compact with <br />vibratory compaction equipment. They are dry and may require additional moisture to reach <br />optimum moisture for compaction. <br />No organic soils, roots, stumps, logs, brush, etc. should be used as structural fill below any <br />foundation or pavement section. We recommend that all fill material be free of soft, wet, or <br />frozen soils, highly expansive soils, rubble, debris, and rocks in excess of 6 inches in diameter. <br />The fill should be as uniform as possible both in composition and moisture content. <br />We recommend all fill be compacted to the minimum relative density levels shown in the table <br />below: <br />Location <br />Recommended Compaction Level <br />(Percent of Std. Proctor ASTM D698) <br />Below Pavements, deeper than 3 feet from finished subgrade <br />95% <br />Below Pavements within 3 feet of finished subgrade <br />100% <br />Landscape Areas <br />90% <br />We recommend all fill placed in the roadway areas be compacted in 8-inch loose lifts. All fill <br />should be compacted at a moisture content within plus 2% or minus 3 % of the optimum moisture <br />as determined by a standard proctor. We recommend compaction tests be taken on any utility <br />trench backfill at a rate of one test per 200 feet in the bottom, middle and top thirds of the trench <br />backfill. We recommend compaction tests be taken at a rate of one test for two feet depth of <br />embankment fill per 200 linear feet of roadway fill. We recommend compaction tests be taken at <br />Page 6 <br />