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<br /> <br />~G'Li <br /> <br />" <br /> <br />~IETKOI'I'I.IT;\:'\ \\A1[1I 1l1:;TRICT <br /> <br />Trench excavation .\IId pipp layill~ were sbll'tcd in -"clwdule ~,ISC <br />at Nigger Slollj.!h near 189th Strect and wcre l'Ontillllt'd northerly <br />to a connection with the compll'lt'c1 schedule :!:~SC at 98th Street <br />and Wadsworth Avenue. The equipment W;IS then Ilw\'ed to 2:!:3rd <br />Street, in schedule 2~)SC. workinj.! 1l0l1h to l~!tth Street, and finally <br />to the tunnel portal of Palos \' enles l'egen"oi I' working northerly <br />to complete the lille at ~:!;~ni Str('t'L All trellt'h, eXtOept for a few <br />short SI>ctiOlls, was ('xcavatcd with a ll'cnching machine through <br />silty clay which Joequired only skeleton b\}!ging on 8. to 30-foot <br />cenlers. With the exception of ilOO fed lit the $outh crossing of <br />Nigger SloUKh and .100 feet on the north J'\]oPi!' of the Palos Verdes <br />Hills, where small QUClntitil'S of water were encollntered, the trench <br />was dry. The depth of treneh varied from 8 feet to 12 feet and <br />the aVemg"e net nHe of excavation :tppl"oximated lOll f..'d pel" hour, <br />A draglinc and a truck crane etluipped with a clamshell bucket <br />performed the remainin~ exca\'ation, the latter heinJ! used for bell <br />holes mill misn~ll.111l'UUS johs, Following rou~h excavation the <br />bottom of the trelleh WllS tini!;;h...d hy lmllrl. :l !'Creed heill~ uso..'{) to <br />complete a cradle for the pipe. <br />All pipe WitS fahricall'rl in :3n-1"00t Il'll)!ths at the pl.tIlt of the <br />J!cneral {'ontractor, usillf;! mild stl-el plate from % to % of an inch <br />in thickllt>ss. The ends were trimnll'd and helled as n'<luired, cadI <br /> <br /> <br />i <br /> <br />,rll t -:{j <br />., ""..., 1 <br />""'..-' <br />,"':ll--..~..J;; <br />-."..: <br />. . <br />-:--' ... <br />. ~~-.,,; <br />-"- t"~;t! <br />.~-' .~....... <br />..' ..' <br />""".fI"-_""-'-'';;'' <br />_.#:<4~~""'-":'" <br />, i't-~. <br />.~~ <br /> <br />L~lyillg ~tf'1'1 lJlll(' <br /> <br />