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3 of 21 <br /> PROJECT NO. SHEET NO. <br /> �►� S221006-2XR <br /> PROJECT 2418 74th St SE Everett WA 98203 <br /> LONGITUDE SUBJECT Foundation Stabilization/Jacking <br /> ONE TWENTY° <br /> ENGINEERING&DESIGN BY JT DATE 11/19/2022 <br /> Scope/Objective: <br /> To determine the required pile spacing and geometry to stabilize and lift(where required)the existing structural foundation. These <br /> findings have been based upon the calculated strength of the existing foundation system and the current vertical loading from the <br /> existing structure above(based on as-built assessments). <br /> The R&R Foundation Specialists'(R&R)proposed pile layout can be found in the following pages with structural recommendations <br /> based upon the findings of L120 Engineering&Design. <br /> Note that cosmetic damages to rigid wall coverings/members and siding are expected during a foundation lift. Such cosmetic <br /> damages/cracks are to be repaired by others following the completion of the foundation stabilization and lifting and are not included in <br /> the structural scope presented here. <br /> It should be further noted that L120's scope is limited to the perimeter support systems/continuous footings.The interior crawl-space <br /> support system for the first floor shall be installed per R&R. This could include the use of some or all of the following:longer support <br /> posts,adjustable post-base hardware,and/or the addition of taller wood support members. Settlement in these interior support areas <br /> shall be monitored and further adjustments shall be made if necessary. <br /> Structural Summary: <br /> -The foundation of the residence consists of continuous cast-in-place concrete stem wall and concrete strip footings.Below the footings, <br /> piles are to be spaced at a distance no larger than 8'-0"o.c.as indicated on the attached Level Survey. <br /> -End piles shall not exceed the maximum corner offset as specified on the attached Level Survey. <br /> -A maximum allowable loading of 1,480 plf was utilized in this analysis.This was determined through inspection of building geometry <br /> and conservative span/tributary loading assumptions based on standard construction practices <br /> - The following load values represent the maximum expected pile loads for the indicated spacing. R&R to provide pile and equipment <br /> assemblies with capacities equal to or greater than the indicated load values. <br /> Allowable Load Capacity Requirement: <br /> Helical Pile#1-2 @ 8'-0"o.c. 9.0 kip minimum vertical capacity(allowable load) <br /> Helical Pile#3-4 @ 8'-0"o.c. 12.0 kip minimum vertical capacity(allowable load) <br /> Note: Refer to the attached General Notes for additional requirements. <br /> - As determined by R&R,the site appears to have no lateral(horizontal)displacements or concerns. As such,the analysis and <br /> recommendations presented in this report have been strictly limited to vertical stabilization/jacking. If lateral movement is observed or <br /> expected additional structural analysis will be required. <br /> - Structural recommendations contained in this package are based on site photographs dated September 11th,2022,provided by R&R. <br /> To the knowledge of L120,a geotechnical investigation was not performed on this site.Consequently,all structural recommendations <br /> assume adequate soil conditions to obtain the required pile capacities. <br /> Please inform L120 of site-specific conditions that were unconsidered by,may conflict with,or otherwise compromise the <br /> recommendations contained within this package,including,but not limited to,water drainage,slope stability,existing structural damage, <br /> or existing subsurface obstructions. In this instance,the structural assumptions,recommendations,and scope for this project will need <br /> to be revisited to consider and address the new findings <br /> Refer to the following pages for pile and connection specifications. <br /> L120 ENGINEERING&DESIGN <br />