Field operations were conducted from 15 November to 10 December 1 Q 67 

 in the Point Conception complex. Actual injection and tracing operations 

 took place from 1 December to 10 December 1967- Information pertinent to 

 injection operations is summarized by Table IV below. 



TABLE IV 

 Summary of Injection Operations, Point Conception 













Total 











Tagged 



Activity 



Injection 



Injection 



Injection 



Injection 



Sand 



Xe-133 



Number 



Date 



Area 



Depth 



(liters ) 



(millicuries) 



1 



1 Dec 6? 



A 



30 feet 



^0 



1,200 



2 



2 Dec 67 



C 



30 feet 



ko 



800 



3 



7 Dec 67 



B 



30 feet 



Uo 



600 



h 



10 Dec 67 



A 



Surf Zone 



1 



120 



The actual data on sediment characteristics and observed wave con- 

 ditions at the study sites were used to compute the parameters summarized 

 in Table III. These parameters indicate sediment on the marine bottom at 

 each of the 3 injection sites should have moved during the course of field 

 operation. Significant (twice background) corrected radiation and survey 

 tracks of the towed detector vehicle are shown by Figures kk through 50. 

 An approximation (or estimate) of the general direction of movement may 

 be obtained by comparing the centroid o^ radiation values to the initial 

 injection location. These directions (foi a depth of 30 feet) are sum- 

 marized as follows: 



Area C: from point of injection toward the SW to NW 



Area B: from point of injection toward the ESE to SE 



Area A: from point of injection toward the SSW to SE. 



Precise monitoring of the injection in the surf zone on 10 December 

 1967 was not attempted. For this test a small quantity of tagged sand 

 was placed in the surf zone and an attempt made to follow it with the 

 detector. This test demonstrated the capability of working in the surf 

 zone; and this capability will be utilized in future tests. 



Results of the Point Conception tests indicate that under the con- 

 ditions extant during tracing activities in December 1967 , the rate of 



Text resumes on page 66 



58 



