Agenda - Council - 04/25/2017 - Laserfiche WebLink

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Review File: Covenant Meadows Geotechnical Reports Review Engineering Review March 22, 2017 Page 2 of 2 Boring 4 found poorly graded sand with silt to 8 feet and poorly graded sand below down to termination depth. Boring 6 found poorly graded sand with silt to 8 feet and poorly graded sand below down 14 feet with silty sand to termination depth. All of the sands encountered were in a very loose to loose condition. The report recommended over excavation, replacement and compaction of soils below utility lines. Recommendations The City requires that consideration be given to over excavation, replacement and compaction of soils be performed below all proposed pavements. The sandy lean clay encountered in boring 1 should be replaced with on-site sands so that all of the pavement subgrade is uniform. The sandy lean clay under the proposed infiltration area should be replaced with onsite sandy soils,minimally compacted to promote infiltration. If soils correction is not performed on the house pads then density tests at footing level and a report will be required with every building permit. The Tradewell report was dated February 9,2017. As noted above,2 feet of frost was encountered on the site in January when NTI performed their borings.A narrative listing the actual dates of the borings and evaluation of the suitability of the soils must be submitted for these borings. The borings list conditions changing at 12 inches which would be hard to pick out if the ground is frozen to 2 feet. The location map and narrative must be submitted for review and must include the items noted above.