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<br />89. The main I ine of the AT.\.SF wou Id be ,raised 6.0 },ee,t at the
<br />I evee cross I ng ,near the upstream, end and an open I ng ,wou'l d be' "prov i ded.
<br />The rai I road elevation at filis point would be at deSign 'yi'ilfe'r surface
<br />and sandbagging would be required to provide freeboard. Consideration
<br />was given to the use of a stop log structure, but due to the rapid rise
<br />of the Arkansas River after intense storms; such 'a"structure wo~ld
<br />const i tute a hazard. rhe br i dge of the' Arkansas 'Va I ley Branch line,
<br />wh i ch crosses the Arkansas River north of Las An I mas, WOLl I,d. be a I tered
<br />by reconstruct i ng the ex i st i ng deck steel plate g i rdersto ,thr'o\lgh
<br />steel plate girders to provide 3 feet of cleqrance,above the de~ign
<br />water surface. Also, a portion of the wood trestle at b~n ends would
<br />be replaced with through stee I plate girders,.
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<br />90. ,The capac i ty of the ex i st i ng U. S. Highway 50 bi-i:dge across
<br />the Arkansas River I s I nadequate to pass the des i gn t10vi tif 140',000
<br />c. f. s . The Co I orado De partment of Highways consi dersthe'structure
<br />obsolete from a traffic standpoint and plans to 'replace, it In the near
<br />future. rhe Department has adVised that the replacementS'tructure wi II
<br />be des I gned to erov i de the requ ired wi;lterway, epen i ng but that aCtua I
<br />programm i hg of construct i on is cont i ngent upon a Hr'm p I an of the
<br />proposed I oca I protect i on project and the actua I dat,es at .start~ ng and
<br />completion of construction. Since the bridilaiS' t6ber~placed for
<br />reasons other than to meet requirements for.f I oed 'protection, the cost
<br />has not been i nc I uded in the est I mate of ,projectcests.
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<br />91. The Las An i mas sewage treatment' fac I I /.ty compr i si ng three
<br />open lagoons is located approximately one-half mi Ie below the city on
<br />the right bankof the: Arkansas River. The, lagoqns discharge into the
<br />Arkansas River Through open ditches which wOuld be cut off by the right
<br />bank levee. A 10-inch pipe would be installed th~ough the levee to
<br />accommodate gravity discharge from the lagOons during periods of low
<br />f low I n the Arkansas River. When the r'l ver 'i s at hi gh 'stage, the
<br />sewage discharge would be pumped over the levee by an electric-powered
<br />weatherproof pump with a capacity of 210 g.p,m. A second pump of the
<br />sail'e capaci ty wou I d be i nsta lied as a standby un it'.
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<br />92. ' ECON(}.\IC EVALUATION OF SELECTED PLAN.- Theestimat~cf ,f ii-st
<br />cost of the Las An i mas Loca I Protect i on Project i nc I ud'ing con1: i ngenc ias,
<br />On .the basis of January 1963 price leve'\s, is $1,725,000', as gi,~en In"
<br />table 6'. The Federal first cost would'be$I,54I,OOOand then.on-F'ecferal,
<br />$ 184,000. The a I I ocat i on of costs between Federq I ,!ndnon-Feqera I '
<br />'interests, as summarized In table 6, is in accordance 'with ,laws and
<br />establ iShed pol ieies governing local protection project's.:' , '
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<br />, 93.' Non-Federal interests would be required to provide all land's"
<br />easements,and rights-of-way necessary for the construd ion 'of the ,
<br />proJect., In addition, they would bear the cost of rel,Ocatingal,1 roads
<br />and utilities, and the cost of the railroad grade raise westof'the city.
<br />The' ut iI ity re I ocat ion costi nc i udes the cost of 'intake s'tructures for
<br />the i rr i gat ion cana I s to pass througl1 the levees." , ,
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<br />R 1/28/64
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