production is from offshore sources. As of 1971, six of these 

 gas-processing units were large main-line plants that processed 

 principally offshore gas and they processed about 85% of the 

 offshore gas produced (American Petroleum Institute, 1973). In 

 addition, one of these plants has been expanded and two new ones 

 built in 1972-1973 so most of the offshore gas is processed at 

 eight plants located at Calumet, Yscloskey , North Terrebonne, 

 Grand Chenier, Lirette, Toca, Henry, and Pecan Island. 

 Distribution of the gas flow from the Gulf Coast 

 both onshore and offshore is estimated for the year 1970 

 (Table 1.10). It can be seen that the bulk of Gulf Coast 

 needs is supplied from onshore production while most of the 

 offshore production is transmitted elsewhere. The Appala- 

 chian region is the recipient of most of the exported off- 

 shore gas (receiving most of the exported onshore gas as 

 well), getting 1,292 billion cubic feet (BCF) in 1970. 



1.5 — ENVIRONMENTAL PROBLEMS 



The major environmental impacts of OCS development have 

 been in the form of oil spills, dredging and channelization of 

 the wetlands, and onshore development. The specific effects of 

 these actions are discussed in Chapter 3, but this section 

 provides an outline of the major types of oil and condensate 

 spills that have occurred, as well as a discussion of the other 

 types of environmental problems. 



44 



