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City of Lake Elmo <br />CSAH 14 Watermain Improvements, City Project No. 25X.140463 <br />Revision 1.0 <br />Proposal 10002208_001 <br />November 13, 2025 <br />Braun Intertec Page 4 <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. <br /> <br />Upon backfilling or sealing exploration locations, we will fill holes in pavements with a temporary patch. <br /> <br />Over time, subsidence of borehole backfill may occur, requiring releveling of surface grades or replacing <br />bituminous patches. We are not assuming responsibility for releveling or re-patching after we complete our <br />fieldwork. <br /> <br />Sample Review and Laboratory Testing <br />We will return recovered samples to our laboratory, where a geotechnical engineer will visually classify and <br />log them. To help classify the materials encountered and estimate the engineering properties necessary to <br />our analyses, we have budgeted to perform the following laboratory tests. <br /> <br />Table 1. Laboratory Tests <br />Test Name ASTM Test Method Purpose <br />Moisture content D2216 Soil classification, moisture condition, and engineering properties <br />Percent passing #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 but <br />provides additional value to the project, we will request authorization for the additional fees through a <br />Change Order. <br /> <br />Report <br />We will prepare a report including: <br /> <br />▪ A sketch showing the exploration locations. <br />▪ Logs of the borings describing the materials encountered and presenting the results of our <br />groundwater measurements and laboratory tests. <br />▪ Photographic pavement core log. <br />▪ A summary of the subsurface profile and groundwater conditions. <br />▪ Discussion identifying the subsurface conditions that will impact design and construction. <br />▪ Discussion regarding the reuse of on-site materials during construction.