4q^ 



1 STATE OF WASHINGTON DEPARTMENT OF FISHERIES - EXHIBIT D 



2 reading (Secchi disc reading in meters for a 30 centimeter 



3 diameter white disc) for blue light as developed by Poole 



4 and Atkins, 1929> Journal Marine Biological Association, 



5 United Kingdom (l6). 



g No material should be added to the water 



- that causes the extinction coefficient to become larger 



than the standard values as given in the above references. 



In the deeper waters (mid-depth and bottom 

 samples) Jackson Turbidity Units should be less than 25 

 attributable to materials resulting from man-made activities 



Dredging operations should be planned to take 

 into account the seasonal cycles of flow and turbidity so 

 .. as not to exceed the proposed standards, 



Fresh water 



8 

 9 

 10 

 11 

 12 

 13 



15 

 16 



Jackson Turbidity Units (JTU) of less than 

 j_ 5 attributable to materials in fresh-water streams resulting 

 from man-caused activities. 



Dredging operations should be planned to 

 take into account the seasonal cycles of flow and turbidity 

 so as not to exceed the proposed standards. 



5. Temperature P(c) 



Marine and estuary 



18 

 19 

 20 

 21 

 22 

 23 



24 Water temperature should not be altered more 



25 



than 5^ in the range between 40 F (4.4 C) and 60 F (15.6 C). 



