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� tumn cam+ <br />662 CROMWELL AVENUE <br />ST PAUL MN 55114 <br />PHONE 6121645 3601 <br />MMBYATIaiS Of PILE IMSTALLATIOM <br />LABORATORY No. 4220 89-638 <br />1 <br />January 16, 1989 <br />2 <br />1. All piles should be driven to a depth of at least 301 below existinc grade. <br />2. All piles should be driven to a minimum final resistance of 30 blows per <br />foot for the last three consecutive feet of penetration. <br />3. The driving should be terminated if a refusal criteria of 60 blows per foot <br />is achieved, to avoid damaging the pile or hammer. <br />In our opinion, the driving criteria should result in a total working load capacity of 27 <br />tons per pile. This should also provide a factor of safety of about two against pile <br />failure. <br />We performed full-time monitoring of the pile driving procedures on December 30, 1988 and <br />January 3 and 4, 1989. The results of our full-time monitoring are shorn on the attached <br />summary sheet. This summary sheet indicates our pile number, the date driven, the pile <br />cut-off elevation, the total length of pile, and the length of pile cut-off, the length <br />of pile below cut-off elevation, the estimated pile tip elevation and the final driving <br />resistance. The pile number system indicated on a sketch, was used to identify each of <br />the piles. <br />During the driving operations, we recorded the driving resistance for the last several <br />feet cf pile penetration. Pile 16, 17, 022, 124, 025, 129, 134 and !35 were retail. <br />Based on our past experience with similar pile types and hammers, each of these piles <br />should be capable of supporting 27 tons, with a factor of safety of about two acainst <br />pile failure. We also observed that each pile was driven at the locations staked in the <br />field. The pile locations were staked in the field by others. After completicr of the <br />pile driving, we also performed observations regarding the plumbness and general <br />condition of the above grade portion of the pile. Based on the results of our full -tine <br />observations, it is our opinion each of the piles should be capable of supporting 27 <br />tons, with a factor of safety of about two against pile failure. <br />Several piles did not achieve tn,,- recommended resistance criterias during the initial <br />drive. Therefore, these piles were allowed to set for, a period of time, and redriven. <br />Based on the resistance achieved on the restrikes, and our past experience with similar <br />pile types and hammers, it is our opinion the piles which required restrikes rill <br />adequately support the designed 27 ton working load. Those piles which were redriven are <br />identified on the attached summary sheet. <br />A0 A YMN,AL 000TOOTgM TO CLAwrem TM♦ M►1C APO O./OOEL VEA, ALL M000TO AM MANWrTEO AS T../ CCP/10K1 MAL STV OP CLIOP/TO. APO AUT..001- <br />iArMN ■00.6INLMATIOt. v OTATUMOMTO, COMC"00I 00= 6NTMACTO POOM 00 MOAAO~ OUR MAOMrC 00 MOMVCO MPOO,OONO MMTTM. AAAOOV AL <br />