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Proposed Remedial Excavation:4849 Spire Lane,Everett,WA <br /> December 8,2022 <br /> 3. Piles shall be driven in nominal sections and connected with compression fitted <br /> sleeve couplers. We discourage welding of pipe joints, particularly when <br /> galvanized pipe is used, as we have frequently observed welds broken during <br /> driving. <br /> 4. The geotechnical engineer of record or their representative shall provide full time <br /> observation of pile installation to verify that the pile has been driven to adequate <br /> refusal within the anticipated bearing stratum. <br /> The quality of a pin pile foundation is dependent, in part, on the experience and <br /> professionalism of the installation company. We recommend that a company with <br /> experienced personnel be selected to install the piles. <br /> Estimated Pile Length - The required pile length in order to develop the recommended <br /> pile capacity is expected to vary somewhat along the length of the footing, depending on <br /> the actual driving conditions encountered. We estimate that the pile lengths, on average, <br /> may range from 20 to 25 feet below grade. We recommend the pin piles extend a minimum <br /> of 5 feet below the bottom of the adjacent excavation. As such,we recommend a minimum <br /> embedment depth of about 20 feet below the ground surface. <br /> Obstructions - Obstructions may be encountered within the upper fill. Where possible, <br /> the obstructions should be removed to facilitate the pile driving. If obstructions cannot be <br /> removed, the structural engineer of record should be notified to revise the pile layout to <br /> accommodate moving the piles. <br /> Pile Connection — The project structural engineer should provide details to connect the <br /> driven pipe pile to the existing foundation.In our experience,we have observed successful <br /> projects that have utilized L-brackets that attached to the underside of the footing. <br /> EXCAVATION&TEMPORARY SHORING <br /> We understand that the proposed remedial excavation will extend about 15 feet below the <br /> existing ground surface. We expect the excavation to generally encounter from 4 to 8 feet <br /> of loose to medium dense sand over dense to very dense sand. <br /> Because we understand that some of the excavated soils may be environmentally impacted, <br /> we recommend that the handling, storage, and disposal of the environmentally impacted <br /> 22-389_4849 spire lane everett_rpt.docx Page 7 PanGEO, Inc. <br />