53c 



MARVIN ALLUM 



measure. That this criterion is meaningful is attested to 



by the fact that repeated efforts to rear abnormal 



larvae to the juvenile oyster stage have all met with 



failure . 



"The field-sample study was initiated in 

 May 1963 and terminated in August I965. Surface samples 

 of water (field samples) were collected at monthly inter- 

 vals from the stations in the four study areas. Extra 

 sets of samples from some of these stations also were 

 collected on July 6, 1964, and in November 1964, to 

 evaluate water quality changes occurring during mill 

 closure periods. Samples were air transported to the 

 Washington State Department of Fisheries Shellfish Labora- 

 tory for the bioassays, 



"In the waste sample study, 24-hour com- 

 posite samples were collected from individual mill waste 

 streams. Aliquots of these samples were analyzed for 

 SWL, total solids (fixed and volatile), suspended solids 

 (fixed and volatile), total sulfur, BOD^, and COD. The 

 samples were shipped under refrigeration to the Washing- 

 ton Department of Fisheries Shellfish Laboratory where 

 they were immediately prepared for bioassay. Serial 

 dilutions of one part v/aste sample to 10, 20, 100, 200, 

 1,000, 2,000, 10,000, 20,000, 100,000, and 200,000 parts 



