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North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 13 <br />We recommend spreading engineered fill in loose lifts of approximately 8 to 12 inches thick. We <br />recommend compacting each lift of engineered fill with a full size, vibrating, sheepsfoot compactor, or <br />similar in accordance with the criteria presented below in Table 9. The project documents should specify <br />relative compaction of engineered fill, based on the structure located above the engineered fill, and <br />vertical proximity to that structure. <br />Table 9. Compaction Recommendations Summary <br />Relative Compaction, <br />Moisture Content Variance from Optimum, <br />percent <br />percentage points <br />< 12% Passing #200 Sieve <br />> 12% Passing #200 Sieve <br />(ASTM D698 —Standard <br />Reference <br />Proctor) <br />(typically SP, SP-SM) <br />(typically CL, SC, SM) <br />Below bulding pads, <br />less than <br />98 <br />±3 <br />-1 to +3 <br />10 feet of fill <br />Below bulding pads, <br />more than 10 feet of fill <br />100 <br />±2 <br />-1 to +2 <br />Within 3 feet of <br />pavement subgrade <br />100 <br />±2 <br />-2 to +1 <br />More than 3 feet below <br />pavement subgrade <br />95 <br />±3 <br />-1 to +3 <br />Below landscaped <br />surfaces <br />90 <br />±5 <br />-1 to +5 <br />The project documents should not allow the contractor to use frozen material as engineered fill or to place <br />engineered fill on frozen material. Frost should not penetrate under foundations during construction. <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 />C.2.f. 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 <br />Inspections of site grading and engineered fill placement. The purpose of these Special Inspections is to <br />evaluate whether the work is in accordance with the approved Geotechnical Report for the project. <br />Special Inspections should include evaluation of the subgrade, observing preparation of the subgrade <br />BRAUN <br />INTERTEC <br />