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-'v■ <br />ir <br />I- <br />5;'.‘ <br />[ <br />I <br />& <br />i! <br />rfv = <br />f<J. <br />t‘" <br />k <br />”r <br />>f-r.- <br />-V <br />V <br />j;- <br />I: <br />‘mm ■ <br />I*!,*. * ■ <br />P<- <br />'h <br />Wv.tr- <br />L-vv- <br />i, 8,^' ■ • <br />k <br />r>‘. <br />k’-' <br />i- <br />^TS.;'.^"arrsS;.'3«“'‘SJ -^‘vrrlls <br />get lower, for numeroias reasons, including water absorption in roam. <br />If the project requirement is only for short life in a dock <br />foam will probably do the job, unless the fo^ is or very poor qua / <br />the foam will be attacked by waves, ai^ls, 15 vears <br />existing exposed foam docks which have been in service more than ^5 Y^rs, <br />^ M law^as 25 years, but these are the exceptions and were probably <br />with continuoxis flotation and with original lively capaci y m <br />excess of the 30 Ibs./cu.ft. currently used in nany specifications. <br />To achieve long life from polystyrene foam flotation, it nee^ to <br />frcJ^liSve^orcL and Ster absorption. Testing has shown that once a <br />coat jpg or cover protecting the foam is punctured, the enc^ar^ <br />imMdiately filled with water which occupies all the exposed voids in th <br />foam A coating or covering which is subject to puncture ^11 mee <br />IS?«t CoSi of Engineers requirements and protect <br />StIS bT^ animals and narine life. However, mce punctured wa^ <br />aKvoroticn will take place. Wood, sheet metal, sheet alunimm, concrete, and <br />^^^op plastic tubs will also protect against erosion, animals, and marine <br />life but not from water absorption. <br />■J.!S“-o.'S.S5S ".-“•SS., <br />V;H ‘S3 -S <br />site specific project to obtain the life cycle desired. <br />The most popular a,..! prwen ^ tnhs'’'^'’S2e tuhs"^'*"cwr^ <br />rinf «™tyTf"^P^ Here .pain it <br />i. necessary to sp^fy ^11 observed to be as thin <br />Sli°cl£^S*”hi ”ry1):crS^^ sl^es1?^«l%“ ice, tr <br />iroving debris or to provide extra long life. <br />hiil ^^hi^ fd^syst^i^ch should last 40 years, then specify a 40 <br />year flotation product. <br />1 3B,^h\»ved bv using a water tight high density <br />-10-