500 LAUREL DR 2016-01-01 MF Import

Geotechnical Engineering Study page 45 00-2267 Three Story Addition - 50�i Laurel SQreet, Evsrett January 31, 2001 APPEN�IX C 00-2267 Supplemental Pin-Pile Foundation Suoaort General: As indicated earlier, it might prove helaful to provide some supplemental vertical support beneath the perimefer footing around the �nrestem end of the proposed addition. This supplementai foundation support system should help further reduce the risk of foundation system undermining in the event a "catastrophic"landslideweretoac:urunderearthquake(seismic)conditions. The following paragraphs provicJe more detailed descriptions of the system and its installation, and the prooftesting ofthe installed system. Pin-Piling: The pin-piles should consist of segments of two inci� (nominal) diameter, schedule 80, "strong" black iron pipe. Each pile should be driven-in- place with an air compressor operated ninety (90) pound jack hammer until refusal ;defined below) is achieved, or the top of the pile segment is about six inches above the ground surface. In the latter case, anothei segment of pile is attach�d with a"force-fiY' pinned connector. After connecting the segrnents driving is restarted and continued again until refusal is achieved or another pile segment is required. Because of the proposed usage of these piles we recommend that the force fit connectors also be welded for the fuil circumference of the pipe. Refusal is defined as follows: "Refusal in consider��d to be �ess than one inch of pile penetration after one full minute of continuous driving with an air compressor operated nirrety (90) pound jack hammer." Pin-Pite Under�inning Design Parameters: We recommend the following geotechnical parameters be used in the design of the supplemental pin-pile underpinning for this proposed addition: e Allowable axial pin-pile load capacity = 4 kips (including all dead and live loads) G