Line placement. 



L-20M Unless otherwise specified by the land manager, all flow lines 

 following a levee must be placed on the surface. Line location 

 may be either on top or at the toe of the levee, as directed by 

 the land manager. 



L-32P Unless otherwise specified by the land manager, all surface flow- 

 lines must be buried before crossing canals, bayous, ditches, 

 or other watercourses. The surface line cannot approach any 

 closer than (desired distance) meters to the bank. 



L-28P To the greatest extent possible, new gas and oil pipelines will 

 use existing pipeline easements to route the facility across 

 refuge lands. 



L-29P Unless site conditions are shown to be totally unsuitable, the 

 "push-ditch" or "shove" method of pipeline installation shall 

 be utilized. 



Backfilling. 



L-22M Unless otherwise authorized by the land manager, all levee breaks 

 resulting from pipeline installation shall be completely back- 

 filled with all available spoil removed during excavation 

 operations such that final surface contours approach original 

 site conditions as nearly as possible. In the event additional 

 fill material is required to compensate for settlement, it shall 

 be removed from scattered deep holes within the easement, rather 

 than from continual surface cuts. The land manager may prefer 

 to require that fill material be imported rather than extracted 

 from marsh areas. 



Plugs along banks for pipeline ditches. 



L-32M All backfilled levee gaps that may be subject to water erosion 

 from currents or waves are to be surfaced with a ( desired depth ) 

 cm thick layer of shall, stone, or concrete riprap on both leveel 

 slopes. The riprapped area shall extend ( desired distance ) meters 

 laterally beyond the boundaries of the backfiled area. The permit- 

 tee shall be responsible for the maintenance of this structure. 



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