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Bremer Financial Corporation <br />Project B2008939 <br />November 17, 2020 <br />Page 14 <br /> <br /> <br /> <br />We recommend spreading engineered fill in loose lifts of approximately 12 inches thick. We recommend <br />compacting engineered fill in accordance with the criteria presented below in Table 6. The project <br />documents should specify relative compaction of engineered fill, based on the structure located above <br />the engineered fill, and vertical proximity to that structure. <br /> <br />Table 6. Compaction Recommendations Summary <br />Reference <br />Relative Compaction, <br />percent <br />(ASTM D698 – <br />Standard Proctor) <br />Moisture Content Variance from Optimum, <br />percentage points <br />< 12% Passing #200 Sieve <br />(typically SP, SP-SM) <br />> 12% Passing #200 Sieve <br />(typically CL, SC, ML, SM) <br />Below building footprint <br />and oversizing zones 98 ±3 -1 to +3 <br />Within 3 feet of <br />pavement subgrade 100 ±3 -1 to +3 <br />More than 3 feet below <br />pavement subgrade 95 ±3 ±3 <br />Below landscaped <br />surfaces 90 ±5 ±4 <br />Adjacent to below-grade <br />wall 95* ±3 -1 to +3 <br />*Increase compaction requirement to meet compaction required for structure supported by this engineered fill. <br /> <br /> <br />The project documents should not allow the contractor to use frozen material as engineered fill or to <br />place engineered fill on frozen material. Frost should not penetrate under foundations during <br />construction. <br /> <br />We recommend performing density tests in engineered fill to evaluate if the contractors are effectively <br />compacting the soil and meeting project requirements. <br /> <br />C.2.h. Special Inspections of Soils <br />We recommend including the site grading and placement of engineered fill within the building pad under <br />the requirements of Special Inspections, as provided in Chapter 17 of the International Building Code, <br />which is part of the Minnesota State Building Code. Special Inspection requires observation of soil <br />conditions below engineered fill or footings, evaluations to determine if excavations extend to the <br />anticipated soils, and if engineered fill materials meet requirements for type of engineered fill and <br />compaction condition of engineered fill. A licensed geotechnical engineer should direct the Special