7818 LARIMER RD B Geotech Report 2022-10-25

t • Pile Installation Approval: All piles should be proof -loaded in the presence of AGS representative. Load tests should be performed on 3% of installed piles or a maximum of 5 piles. At least one load test should be performed. Full time pile load testing and pile installation inspection should be performed by AGS representative and all piles should be approved by AGS prior to the placement of concrete. If piles are driven using other types of hammers, then a load test should be performed on 20 percent of piles. Load test capacity should be 200% of design capacity. • Pile Caps and Grade Beam: Use to avoid eccentric loading and to combine two piles or more. • Pile Couplings: Use threaded or slip couplers if they fit tightly and transfer load without loss of capacity. Welding of pipe sections may also be used. • Lateral support: All piles should be designed for adequate lateral support at all locations (especially for potential soil creep) as per our geotechnical design once the project plans are finalized. At your request, we can provide recommendations for other types of deep foundation such as straight -shaft drilled piers or driven H piles. SLAB -ON -GRADE Slabs should not be constructed without a geotechnical design for the site after site grading plans and project design is completed and made available for our review. For design of floor slabs, a modulus of subgrade reaction of 200 pounds per cubic inch (pci) may be used provided slab -on - grade is placed on properly prepared subgrades after the completion of soil modification procedures described earlier. Based on the results of our analyses, we believe that interior floor slabs designed as recommended above and constructed as recommended in following paragraphs could result in "total" movement of approximately up to 1-inch with "differential' movement on the order of half the total movement. We recommend that the construction measures outlined in the following paragraphs be followed to reduce potential damage to floor slabs: • Frequent control joints should be provided at about 10 feet spacing in the floor slab to reduce problems with shrinkage and cracking according to ACI specifications. Control joint spacing is a function of slab thickness, aggregate size, slump and curing conditions. The requirements for concrete slab thickness, joint spacing, and reinforcement should be established by the designer, based on experience, recognized design guidelines and the intended slab use. Proposed Construction Project No: 0470-WA18 January 24, 2019 Page No: 8 of 17