PIBREBOARD CORPORATION - EXHIBIT D 



Effects of Proposed Submarine Discharge 

 Because its density Is much less than that of 

 seawaterj wastewater discharges at or near the surface form 

 a relatively thin layer. During the 1961 study ;, It was found 

 that clear underlying seawater was brought to the surface by 

 a small boat's propeller. Such a surface Is exposed to wind 

 and wave action and, therefore, tends to disperse quite 

 rapidly. The Immediate oxygen demand of the waste is met by 

 surface reaeration and by dilution in the surface waters. 

 Accordingly, it has a negligible effect on dissolved oxygen 

 levels in the great mass of underlying seawater. This con- 

 clusion is attested to by the observation of marine life 

 reported in the proceeding paragraphs. 



The question arises as to the relative merits 

 of a deep water discharge into the harbor. By discharging 

 through a multiple-port diffuser, it is possible to obtain 

 rapid initial mixing, possibly as high as 60 parts of sea- 

 water to 1 part of wastewater. The mixture, however, will 

 form a relatively thick surface field which will have a 

 lesser tendency to remain on the surface. Thus a higher 

 concentration of sulfite waste liquor would exist in the 

 underlying waters. As a result, a greater depression of 

 dissolved oxygen levels would be expected that with a surface 

 discharge . 



