PROJECT 



SUB-PROJECTS 



ACTIVITIES 



DISTURBANCES 



EFFECTS 



Platform — > 



fabrication 



yard. 



Navigation - 

 improvement 



Site prep- 

 aration 



Dredging, - 

 spoil dis- 

 posal 



-^ Clearing, 

 grading 



Spoil dis- -^Turbidity, 

 charge, dredge oxygen de- 

 spillover pletion 



Soil erosion,— >Sedimenta- 

 loss of cover tion, runoff 

 pollution 



Primary development usually creates demand for secondary development . 

 Secondary development has two major components: indirect development , 

 typified by those industrial projects that serve and support the primary 

 projects, often through sub-contracts; and induced development , the 

 construction or expansion of community facilities and services (such as 

 housing, utilities, transportation, schools, recreation and commercial 

 facilities) to serve the added population attracted by employment 

 opportunities in direct, indirect, and induced developments. 



With the addition of these secondary developments, which produce 

 environmental effects through the same sort of chain of events as primary 

 development , an example of one portion of the network of items to be aware 

 of in evaluating the potential onshore impact of OCS development now looks 

 like this: 



DIRECT 

 PROJECT 



SUB-PROJECTS 



Platform — ^ Navigation — 9 

 fabrication improvement 

 yard 



Site 



INDIRECT 

 OR INDUCED 

 PROJECT 



Housing — 

 develop- 

 ment 



preparation 



ACTIVITIES 



Dredging, 



spoil 



disposal 



.Site 



preparation 



Sol id waste 

 systems 



Clearing, 

 grading 



-> Clearing 

 grading 



DISTURBANCES 



-> Spoil dis- — > 

 charge, dredge 

 spillover 



-^Soil erosion, - 

 loss of cover 



EFFECTS 



Turbidity, 



oxygen 



depletion 



■Sedimentation 

 runoff pollution 



Soil erosion, — ^Sedimentation, 

 loss of cover runoff pollution 



-> Filling of — >Loss of 

 wetlands habitat 



-> Increased BOD 



