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4 <br /> Mr. Brad Marucha <br /> MCO and Associates <br /> Plan Check Number: B1908-057, First Building Review <br /> September 10, 2019 <br /> The submittal documents include RFI #22, which appears to specify providing 3-inch weep <br /> holes at the base of the wall and at a maximum spacing of 20 feet. The detail shall be revised <br /> to clearly specify the drainage requirements for the wall. Alternatively, the wall shall be <br /> designed for hydrostatic pressures in addition to other soil and surcharge loads. Hydrostatic <br /> pressures shall be considered for both internal and global stability. See IBC Sections 107.2.1, <br /> 1602.1, 1604.1, 1605.2, 1610.1, and 1807.2. <br /> 6. Detail 5/SF1.1 does not specify a minimum concrete strength for the retaining wall. Note that <br /> the"Concrete" portion of the General Notes on Sheet SF1.0 for Permit No. B1805-010 does not <br /> list concrete requirements for site retaining walls. The walls are exposed to freeze-thaw cycles <br /> and water, and qualify as Class F2 concrete per ACI 318-14 Table 19.3.1.1. In addition, the <br /> walls are located along parking surfaces and vehicle driveways, and will be exposed to deicing <br /> chemicals, which qualifies as Class F3/C2 concrete. Per ACI 318-14 Table 19.3.2.1, the <br /> minimum concrete strengths F3/C2 concrete is 5,000 psi. The minimum required strength for <br /> the structural concrete shall be specified in the detail. See IBC Section 1901.2. <br /> 7. Detail 5/SF1.1 specifies vertical and horizontal reinforcement at 24-inch spacing in both <br /> directions. The maximum spacing for wall reinforcement shall not exceed the lesser of 3h or 18 <br /> inches per ACI 318-14 Sections 11.7.2.1 and 11.7.3.1. The detail shall be revised. See IBC <br /> Section 1901.2. <br /> 8. Detail 5/SF1.1 specifies #5 horizontal reinforcement at 24-inch spacing. Based on a minimum <br /> 8-inch thick wall, the reinforcement ratio is 0.0016. The ratio is less than the minimum value of <br /> 0.002 required for transverse (i.e., horizontal) reinforcement per ACI 318-14 Table 11.6.1. The <br /> detail shall be revised. See IBC Section 1901.2. <br /> 9. Detail 5/SF1.1 specifies #4 reinforcement in both directions for the footing. The footing has <br /> longitudinal and transverse reinforcement ratios of 0.0017 and 0.00185 based on a minimum <br /> thickness of 18 inches. The reinforcement ratio shall not be less than 0.0018 per ACI 318-14 <br /> Table 24.4.3.2. The reinforcement shall be revised. Note that if the foundation thickness <br /> increases, the transverse ratio may also be insufficient. See IBC Section 1901.2, and ACI 318- <br /> 14 Sections 13.3.2.1 and 7.6.4.1. <br /> 10. Detail 5/SF1.1 specifies minimum wall and foundation thicknesses of 8 inches and 18 inches, <br /> respectively. Considering the previous comments, the reinforcement ratios may be inadequate <br /> if thicker elements are constructed. The required thicknesses of the wall and foundation should <br /> be specified. See IBC Section 107.2.1, 1603.1, and 1905.1 Item 3. <br /> 11. Detail 5/SF1.1 specifies #5 top transverse flexural reinforcement at 12-inch spacing. See IBC <br /> Section 1901.2 and ACI 318-14 Section 13.3.2.1. The following comments shall be addressed: <br /> a. The flexural reinforcement ratio is 0.0009, which is less than the minimum ratio of 0.0018 <br /> required by ACI 318-14 Table 7.6.1.1. The reinforcement shall be increased. <br /> b. The flexural reinforcement shall be provided with a standard hook at the wall-side of the <br /> foundation to develop the bars. See ACI 318-14 Section 25.3.1. <br /> EO 3200 Cedar Street 0425.257.8810 0 everetteps@everettwa.gov <br /> Everett,WA 98201 425.257.8857 fax everettwa.gov/permits <br /> Cage 3 of.4---?) <br />