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FROM : TiSiC ENGRS PHO� N0. : 425 267 3393 <br />Toevner\Schuld\Canfield, LL� <br />CONSULTING ENGINEERS <br />January 7, 1999 <br />David Piggott <br />P.O. Box21o5 <br />Alderwood, Manor, WA 98036 <br />Subjact: P�ojeci No. C98088 <br />Emerald Gardens DeteMion Vault <br />Letter No. 3 <br />2500 psi Concrete <br />Dear Davitl: <br />Jan. 67 1999 09:11RM P2 <br />a Umlted Liability Company <br />in Structural Analysis and <br />Mr. Steve Miller of the Everett euilding Department has asked us if we wi11 requlre speGal inspection for <br />the subject proJed. S(nce the origfnal speGficaUons required 300D psi �ncrete, special inspectfon would <br />be required. . <br />Review of the structural calculations reveals that 250U psi concrete will edequately support the design <br />loads. Therefore we recommend use of 2500 psi concrete in Ifeu of 3000 psi conaete to eliminate the <br />reqUirement for special inspection. <br />Should you have any questions or desire additional informalion, please do not hesitate to contad us. We <br />trust this fuifilis the requirement for an engineePs letter specifying the concrete strength, and in that <br />regard, it is <br />Respe�fully Submitted, <br />� ` <br />� � ��� <br />Clayton M. Cartfield, . . <br />