133 E BEECH ST 2020-01-21 - Laserfiche WebLink

3 of 41 A PROJECT NO. SHEET NO. 7•••••1 S 190702-1 133 E Beech St, Everett, WA PROJECT LONGITUDE SUBJECT Foundation Stabilization/Jacking ONE TWENTY° ENGINEERING&DESIGN BY CMH DATE 07/09/2019 Scope/Objective: To determine the required pile spacing and geometry to stabilize and lift(where required)the existing structural foundation. These findings are based on the calculated strength of the existing foundation system and the current vertical loading from the existing structure above (based on as-built assessments). The Ram Jack West proposed pile layout can be found in the following pages with structural recommendations based upon the findings of L120 Engineering&Design.These recommendations are limited to the scope of the stabilization as proposed by Ram Jack West. Note that cosmetic damages to rigid wall coverings/members and siding are expected during a foundation lift. Such cosmetic damages/cracks are to be repaired by others following the completion of the foundation stabilization and lifting and are not included in the structural scope presented here. It should be further noted that L120's scope is limited to the perimeter support systems/continuous footings.The interior crawl-space support system for the first floor shall be installed per Ram Jack. This could include the use of some or all of the following:longer support posts, adjustable post-base hardware, and/or the addition of taller wood support members. Settlement in these interior support areas shall be monitored and further adjustments shall be made if necessary. Structural Summary: -The foundation of the residence consists of continuous cast-in-place concrete footings. Below the cast-in-place concrete footings, piles are to be spaced at a distance no larger than 6'-0"on-center at the locations indicated on the attached Level Survey. Alternatively, piles can be spaced at distance no larger than 8'-0"on-center if C6x8.2 channels are installed spanning from pile-to-pile. -End piles are to be placed as close to corners as possible and shall not exceed a max corner offset distance of 3'-0". -A maximum allowable loading of 2,500 plf was utilized in this analysis.This was determined through inspection of building geometry and conservative span/tributary loading assumptions based on standard construction practices - The following load values represent the maximum expected pile loads for the indicated spacing. Ram Jack West to provide pile and equipment assemblies with capacities equal to or greater than the indicated load values. Allowable Load Capacity Requirement: Exterior/Perimeter Piles @ 6-0"o.c. 17 kip minimum vertical capacity(allowable load) Exterior/Perimeter Piles @ 8'-0"o.c. ............ 19.2 kip minimum vertical capacity(allowable load) Note:Refer to the attached General Notes for additional requirements. - As determined by Ram Jack West,the site appears to have no lateral(horizontal)displacements or concerns. As such,the analysis and recommendations presented in this report have been strictly limited to vertical stabilization/jacking. If lateral movement is observed or expected, additional structural analysis will be required. - Structural recommendations contained in this package are based on site photographs provided by Ram Jack West on July 2,2019.To the knowledge of L120,a geotechnical investigation was not performed on this site. Consequently,all structural recommendations assume adequate soil conditions to obtain the required pile capacities. * Please inform L120 of site-specific conditions that were not explicitly identified,contradict, or otherwise compromise the recommendations contained within this package, including, but not limited to,water drainage,slope stability, existing structural damage, or existing subsurface obstructions. In this instance,the structural assumptions, recommendations, and scope for this project will need to be revisited to consider and address the new findings. Refer to the following pages for pile and connection specifications. L120 ENGINEERING&DESIGN