289 



Philadelphia's generally would tend to support New York City's 

 findings that sources of certain metals to its treatment plants 

 are predominantly non- industrial (i.e., commercial, residential 

 run-off, and water supply). 



6. Are there any other factors which might require the cities 

 to employ different disposal options? 



In addition to the previously mentioned factors of differing 

 sludge quality, differing state regulations, and amount of land 

 area available ( factors that greatly influence direct land ap- 

 plication), incineration is probably a less acceptable option 

 for New York City than for Philadelphia because of the differ- 

 ences in ambient air quality. 



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