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<br />. <br /> <br />Chapter 2 <br />General Considerations <br /> <br />" <br /> <br />2.1. Coordination <br /> <br />. <br /> <br />The coordination effort required for design and con- <br />struction of a sheet pile waIl is dependenl on the type <br />and locaIion of the projecL Coordination and coopera- <br />tion among hydraulic. geotechnical. and sttuclllral <br />engineers most be continuous from the inception of the <br />projecl 10 fmal placemeDl in operation. AI the begin- <br />ning. these engineering disciplines mUSI consider alter- <br />native wall Iypes and a1ignmenls 10 identify real estaIe <br />requiremenls. Other disciplines most review the pr0- <br />posed projecllo delermine ils effecl on existing facilities <br />and !he environmenL Qose coordination and consulla- <br />lion of the design engineers and local inleresls must be <br />mainlained Ihroughoul the design and construction pr0- <br />cess since local inleresls share !he cost of !he projecl <br />and are responsible for acquiring righls-of-way, accom- <br />p1ishing relocations. and operating and mainlaining !he <br />compleled projecL The projecl site should be subjecled <br />10 visual inspection by all concerned groups throughoUI <br />the implemenlalion of the project from design through <br />consttuction 10 placemenl in operation. <br /> <br />2-2. Alignment Selection <br /> <br />The a1ignmenl of a sheel pile wall may depend on ils <br />function. Such situations include !hose in hatbor or port <br />construction where !he a1ignmenl is diclalecl by the <br />water source or where !he wall serves as a tie-in 10 <br />primary struCIUreS such as locks, dams. e1c. In urban or <br />induslrial areas, il will be necesS8ly 10 consider several <br />a1lema1ive a1ignmenls which most be closely <br />coordinated with 1oca1 inlerests. In other circumSlances, <br />the a1ignmenl may be dependenl on !he configuration of <br />!he system such as space: requiremenls for an anchored <br />wall or the neceSSlUy right-of-way for a fIoodwaIlJlevee <br />system. The final alignment must meet the ge~ <br />requiremenls of providing !he masl viable compromtse <br />belWeen economy and minimal environmenlal impacL <br /> <br />. <br /> <br />a. ObS/TlU:tiollS, Site inspections in !he planning <br />phase should identify any obstructions which interfere <br />with alternative a1ignmenls or which may necessilate <br />special conslrUction procedureS. These site inspections : <br />should be supplemenled by int:onnation oblained from <br />10cal agencies 10 locale underground uIilities suc~ as <br />sewers. water lines. power lines, and telephone lines. <br />Removal or relocation of any obstruction most be <br /> <br />EM 1110.2.2504 <br />31 Mar 94 <br /> <br />coordinated with the owner and the local assuring <br />agency. Undiscovered obstructions will likely resull in <br />construction delays and additional costs for removal. or <br />relocation of !he obstruction. ConlraCls for construCtion <br />in congested areas may include a requiremenl for the <br />contractor. 10 provide an inspection trench 10 precede <br />pile driving. <br /> <br />b. Impacts on the surrounding area. Construction of <br />a waIl can have a severe pennanenl and/or temporal)' <br />impacl on ils immediale vicinity, Permanenl ~pacls <br />may include modificalion. removal, or ~Iocation of <br />existing struclUreS. A1ignmenls which req~ penn~- <br />neDl relocation of residences or businesses reqUire addi- <br />tional lead limes for implemenlalion and are seldom cost <br />effective. Particular consideration most be given 10 <br />sheet pile walls construcled as flood protection along <br />walerfronls. Commercial operations between !he sheel <br />pile wall and the waterfronl will be negatively affecled <br />during periods of high water and, in addition, galed <br />openings through the wall musl be provided for access. <br />Temporal)' impacts of construction can be. mitigaled.1o <br />some exlenl by careful choice of construction stralegles <br />and by placing reslrictions on construction operations. <br />The effecls of pile driving on existing structures should <br />be carefuUy considered. <br /> <br />c. Rights-of-way. In SQIIIe cases. particularly. for <br />flood protection. righls-of-way may already be dedica- <br />ted. Every effort should be made 10 mainlain the align- <br />menl of permanenl c;onstruction within !he dedic.'PII <br />right-of-way. Procuremenl of new righls-of-way should <br />begin in the feasibilily stage of wall design and should <br />be coordinaled with realty specia1ists and local inlerests. <br />Temporal)' serviludes for c;onstruction purposes should <br />be determined and delineated in the contract documenls. <br />When possible. righls-of-way should be marIced with <br />pennanent monU/1lenls. <br /> <br />d. Surveys, All poinls of intersection in !he align- <br />ment and all openings in the waIl should be staked in <br />!he field for projeclS in congesled areas. The field <br />survey is usually made during !he cIelailed design phase, <br />The field survey may be required during !he feasibilily <br />phase if .suilability of !he a1ignmenl is questionable. <br />The field survey should identify any ovemead obstruc- <br />tions, particularly power lines. 10 ensure sufftcient <br />vertical clearance to accommodale pile driving and <br />Consttllction operations. Infonnation on obsttuction <br />beighlS and c1earanccs should be verified with the <br />owners of !he items. <br /> <br />2.1 <br />