492 



STATE OF WASHINGTON DEPARTMENT OF FISHERIES - EXHIBIT D 

 Greater than 95^ saturation with a minimum 

 value of 7 mg/l. These values to be present at the diurnal 

 and seasonal lows and when temperatures exceed 60 F (15.6 C). 



3. PH 



Marine and estuary 



Hydrogen ion concentration expressed as pH. 

 Between pH range of 7.8 and 8.5. Sudden changes of pH units 

 of 0.5 or more should not occur as a result of man-made 

 activities. 



Fresh water 



Hydrogen ion concentration expressed as pH. 

 Between pH range of 6.5 and 8.5 unless historical natural 

 values (conditions) lie outside that range. Sudden changes 

 of pH values of 0.5 or more should not occur as a result 

 of man-made activities. 



4. Turbidity 

 Marine and estuary 



Turbidity for marine and estuarial waters, 

 upper 10 meters (32.5 ft) to be based upon vertical ex- 

 tinction coefficient. Standards should be coastal maximums 

 as listed in Table 22, p. 84 and by Figure 20, p. 85, The 

 Oceans , Sverdrup, Johnson, and Fleming, 1946. A Secchl 

 disc may be used for determination of vertical extinction 

 coefficient using the ratio of 1.7 divided by Secchl disc 



