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wv <br />sna;i rot &e caiO fcr a “d rec ace~ent ai*J^ ccr'pac'.fid <br />fi arfl/cr Vk-a.1 systerr. ccmocr#rts w‘fl £♦ requires at <br />ccr.tractcr experse. Cont'ac:cr sra.i caretj rc; tc <br />Cisturp •.Ttankment nra:er,a;$ Cevcro ;,nes sncrAn. <br />B. pQURdation Sott Preparation <br />1. Fcunpat 5n sc!i snail t# excavated as required fo' <br />'ooting s;mensicr$ shcv.n cn ina ccrsrucrcn <br />C'ff.vrgs, cr as e rected £y Te £rg “cer. <br />2. Peurdaten $c.l snail be examined by ina Er^g'ieer <br />to assu'e tnat tna actual fcurdaticn seJ strenqtn <br />meets cr exceeds assumed cesi^'t strer*stn Sd s <br />not meeting required strengtn sraii ce rem.ovsd and <br />replaced with acceptable material. <br />3. Over-excavated areas snail te Mied wth co-pactec <br />cacxf I! ratenal. <br />C. Base Footing <br />1. Foot.rg snail be oldCed as shdAn cn ihe <br />ccnstpjction drawings w.th a .Tin.‘mum thickness of <br />9 Irenes. <br />2. Fcicting materials sha.l be insta'ied upon <br />undisturbed native so.is. <br />3. Material snail be compacted so as to provide a le'-ei <br />hard surface on which to place tre first course of <br />units. Compaeden wJi be with mecnarucaj plate <br />compacters to 95 percent of standa.'c proctor. <br />4. Footing snail be prepared to insure cor-piete <br />contact of retaining wall unit with base. Gaos shad <br />net be allowed. <br />5. Footing meterlals shall be to the depths end widths <br />shewn. Contractor may opt for usir.g reduced depth <br />of sands ar.d gravel and use 1* to 2* corc.'ete <br />topping Conaete Shan be lean and unreinforced. <br />D. Base Material <br />t. .Mater al for footing shall consist of compacted <br />sands, gravel and/or concrete as shewn on tne <br />COnSTJCton drawings. A minimum of 6 inches of <br />compacted base is required. <br />2. Sieve Size Percent Passing <br />1* ICO <br />No. 4 .. .....................................................35*80 <br />No. 11 . .................. 20*65 <br />No. 40.........................................................10*35 <br />No. 200 ..................................................... 0-10 <br />E. Unit Fill <br />1. Fill for units shall be free draining crusned store cr <br />caurse gravel, W to Gradation, of the fill snail <br />be approved by the Engineer. <br />a. Sieve Size Percent Passing <br />r ................................................. 75*100 <br />r .....................................................35*100 <br />No. 4 10-40 <br />No. 10 ............................................... 5*25 <br />No. 40 ...................................................... 10 <br />No. 200 ...........................................................8 <br />2. Pta.*ficH IS ret reccrame.ne4cl <br />3. A rmomum cf 12 irc-es of un4 fia must extend <br />behind the wall. <br />F. Rehforced Fill <br />1. Mate'ial snail be nat.ve mete.'ial unless othenivse <br />sb8C.fied in the drawings. Unsuitable soils fer <br />backfill shall rot be used witn.n the remfcrceo soil <br />mais A-en us ng jeog.'id for reunfcrcement. <br />2. VVhi-e additic.ral fill Is required, contractor shall <br />s-bmit semcies and sbecifications to the Engineer <br />to cete.mn.'ne if accectabie. <br />G. Backfill <br />1. Ccmpacted or in sibj soil located benind the <br />reinforced scii mass. <br />3.2 PeTA,NING WALL INSTALLATION <br />A. Unit Installation <br />1. .^irst cou.'^e of concrett waa lu'ts Shan be placed <br />cn the focti.ng. The units shall be checked for level <br />and ai.gnment. The first course is the most <br />important to vvsure accurate and acceptable resuits. <br />2. Insure that units are in full ccntaci with base. <br />3. Un.ts a'e placed side by side so they are touching <br />for full length of wall alignment. Alignment may be <br />Cone by means of a string lira or offset from base <br />line Proper care shall be taken to develop straight <br />lines and smooth curvea on base course as per wa'I <br />layout. (Figure 6) <br />4. The units should be checked for level aide to side <br />and front to back. (Figure 6) <br />Figure 6 • First course placement 1$ crucial. <br />5. All cavities arcund each unit and 12* behind an <br />units. Shall be filled with 'unit fOT and compacted. <br />Check again for level and alignmenL Sweep all <br />excess material from top of units and Install next <br />course. (Figure 7) <br />J