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City of Arden Hills <br />Proposal QTB210666 <br />February 21, 2025 <br />Page 4 <br /> <br />Borehole Abandonment <br />We will backfill our exploration locations immediately after completing the drilling at each location. <br />Minnesota Statutes require sealing temporary borings that are 15 feet deep or deeper. Based on our <br />proposed subsurface characterization depths, we currently do not anticipate having to seal any of the <br />boreholes with grout. Upon backfilling or sealing exploration locations, we will fill holes in pavements <br />with a temporary bituminous cold patch. <br /> <br />Over time, subsidence of borehole (core) backfill may occur, requiring releveling of surface grades or <br />replacing bituminous or concrete patches. We are not assuming responsibility for re-leveling or re- <br />patching after we complete our fieldwork. <br /> <br />Sample Review and Laboratory Testing <br />We will return recovered samples to our laboratory, where a geotechnical engineer will visually classify <br />and log them. To help classify the materials encountered and estimate the engineering properties <br />necessary to our analyses, we have budgeted to perform the following laboratory tests. <br /> <br />Table 2. Laboratory Tests <br />Test Name <br />ASTM Test <br />Method Purpose <br />Moisture content D2216 Soil classification, moisture condition, and engineering properties <br />Atterberg limits D4318 Soil plasticity, shrink/swell potential, engineering parameters, suitability of <br />soils for reuse <br />Sieve analysis D1140 Soil classification <br />Percent passing <br />#200 sieve D1140 Soil classification, and evaluate frost susceptibility <br />Organic content D2974 Evaluate suitability of soils for reuse <br /> <br /> <br />We will determine the actual laboratory testing for the project depending on the encountered subsurface <br />conditions. If we identify a laboratory testing program that exceeds the budget included in this proposal <br />but provides additional value to the project, we will request authorization for the additional fees through <br />a Change Order. <br /> <br />Report <br />We will prepare a report including: <br /> <br />▪ A sketch showing the exploration locations. <br /> <br />▪ Logs of the borings describing the materials encountered and presenting the results of our <br />groundwater measurements and laboratory tests. <br /> <br />▪ A photographic pavement core and apparent aggregate base log. <br /> <br />▪ A summary of the subsurface profile and groundwater conditions.