Laserfiche WebLink
3 of 23 <br /> A PROJECT NO. SHEET NO. <br /> S220112-3XR <br /> poi." PROJECT 5008 23rd Ave W Everett WA 98203 <br /> LONGITUDE SUBJECT Foundation Stabilization/Jacking <br /> ONE TWENTY° <br /> ENGINEERING&DESIGN BY JT DATE 04/13/2022 <br /> Scope/Objective: <br /> To determine the required pile spacing and geometry to stabilize and lift(where required)the existing structural foundation. These findings have <br /> been based upon-the c,ek-ulated-stre end the curtentverticailodding(torn the-existing-structure-above <br /> (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 based upon <br /> 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 damages/cracks <br /> are to be repaired by others following the completion of the foundation stabilization and lifting and are not included in the structural scope <br /> 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 support <br /> 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 posts,adjustable <br /> post-base hardware,and/or the addition of taller wood support members. Settlement in these interior support areas shall be monitored and <br /> 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,piles <br /> are to be spaced at a distance no larger than 6'-0"o.c.as indicated on the attached Level Survey. <br /> -Provide CFCR around full circumference of column,min 1-6"beyond extents of the observed cracking above and below.CFCR supplier to <br /> provided containment equivalent to a#4 spiral with a 3"pitch.The columns shall be monitored and a structural engineer contacted for further <br /> assessment if additional cracking is observed in the future. <br /> Note that L120 has not analyzed the column system or lateral system of the primary structure and is recommending the CFCR on this column as <br /> a precautionary measure only. <br /> -End piles shall not exceed the maximum corner offset as specified on the attached Level Survey. <br /> -A maximum allowable loading of 2,700 plf was utilized in this analysis.This was determined through inspection of building geometry and <br /> 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 @ 6'-0"o.c. 8.0 kip minimum vertical capacity(allowable load) <br /> Helical Pile#3-7 @ 6'-0"o.c. 12.0 kip minimum vertical capacity(allowable load) <br /> Helical Pile#8-9 @ 6'-0"o.c. 17.0 kip minimum vertical capacity(allowable load) <br /> Helical Pile#10-12 @ 6'-0"o.c. 16.0 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 expected <br /> additional structural analysis will be required. <br /> - Structural recommendations contained in this package are based on site photographs dated December 21st,2021,provided by R&R.To the <br /> knowledge of L120,a geotechnical investigation was not performed on this site.Consequently,all structural recommendations assume <br /> 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 recommendations <br /> contained within this package,including,but not limited to,water drainage,slope stability,existing structural damage,or existing subsurface <br /> obstructions. In this instance,the structural assumptions,recommendations,and scope for this project will need to be revisited to consider and <br /> address the new findings <br /> Refer to the following pages for pile and connection specifications. L120 ENGINEERING&DESIGN <br />