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n�6�5� i s. 2ooa <br />Mr. Jim �I humas <br />[3elvedcrc Lols 32 arci 33 <br />L&A Job No. 4A088 <br />Page 13 <br />may hc uscd. "I hc abovc sail paramcicr arc unfactorcd va�ucs, and a proper factor of safcty •, <br />shouW bC USCG ill Calculating thc resisling forccs against Ialeral loads on thc buildings. <br />I'ILf? I�OUNUA'llONS <br />Wc recommend steel pin piles be used if pile foundaiions ha�e to be used to mecl the abovc <br />setback recommendations. Steel pin piles are constructed of small diameter sleel pipes. We <br />recommend Ihal steel pin piles be constructed ti-ith 4-inc6-minimum standard steel pipes (4.5 <br />inch outsidc diamcicr by 0.237 inch wall). <br />Pii; piles should bc driven with a hydraulic mechanical hainmcr at Icast 850 pounds delivering <br />600 blows per miiwte minimum, or a differential-acting air hammer at least G00 pounds <br />dclivcrinE, G00 b�ows per minutc minimum. or cyuivaluil hamnurs. Pin pilcs shuulJ bc �rivcn lu <br />penetrele through thc surl7cial loosc soils and scated inro the underlying very-stiff to hard Lawton <br />Clay sei!., of fine sandy silt to clayey silt. Cach pile should be driven lo "refusal" delined as "at <br />Icasl 2ti s�conds of coNinuous driving for onc inch of pilc pcnctration". <br />I'in pilcs uf 4-inch slandard pipc drivcn lo "refusal" should bc ablc to dcvclo� an ullimatc <br />bcaring capacity of 18 tons per pile against a�ial comprcssive luad. The allowable bearing <br />capacity c�f pin pilcs should not bc morc than 9 lons per pilcs bascd on a factor of safery of 2.0. <br />A one-third incnasc in thc above mcommendcd allowablc pilc bcaring capacily may be used <br />when consiJering short-term, lransilory, wind or seismic loads. For long lerm corrosion <br />proteclion, sleel pin piles and their accessories should be �;alvanized or coated wilh bituminous <br />raint.. <br />LIU & ASSOCIAT[;S, INC. <br />�i�l��'� <br />