NSWC/WOL/TR 76-161 



The trawls probably collected smaller numbers of fish because the 

 fish were floating in patches. Also, the boat towing the trawl 

 may have pushed fish aside, thereby reducing the number collected 

 by this method. 



Table 3.12 summarizes the times of the Shot 4 monitoring 

 efforts. 



3.6 Shot 5 



Shot 5 was fired to check on the presence of barium in the 

 river following the detonation of a 1.1-kg charge of Baratol at 

 a depth of 1.5 meters in water 25 meters deep. Baratol is a 

 mixture of BaN0 3 and TNT in a ratio of 73/27. 



Five water samples were collected in the surface pool, which 

 was marked with fluorescein dye. The times were 30, 50, 70, 90, 

 and 120 seconds after the explosion. When analyzed in the atomic 

 absorption spectrophotometer, the barium concentrations were found 

 to be below the limits of detection (0.5 mg/1) . 



The estimated visible fish-kill was 50 menhaden. 



IV CONCLUSIONS 



4. 1 Time and Cost of Monitoring 



When explosion tests are conducted on a routine basis in the 

 same locality over a period of time, some degree of monitoring 

 should be established that is acceptable in terms of both 

 economics and environmental protection. The May 1976 program 

 provided useful information in this regard, and Table 4.1 

 provides guidance as to the number of man-hours required for 

 biological monitoring at increasing levels of effort. 



The costs of supplies are approximate. As 

 include the purchase of a vertical echo-sounder 

 detection and books or color charts for the ide 

 for use on all procedures. The maximum effort 

 requires the purchase of at least two trawls, a 

 line for each, glass jars for specimens, and fo 

 preservative. As the costs are not excessive, 

 readily available, it is clear that the major e 

 biological monitoring is the cost of labor. An 

 more difficult to evaluate is the effect of the 

 monitoring on the total time required to comple 

 program. For example, if four tests can be don 

 monitoring, and only two with extensive monitor 

 field could be doubled, thereby increasing the 

 considerable amount. 



a minimum, they 



for fish 

 ntification of fish 

 of Procedure VII also 

 bout 60 meters of tow 

 rmalin for use as a 



and the supplies are 

 xpense involved in 



expense that is 



added time of 

 te an experimental 

 e in one day without 

 ing, the time in the 

 total cost by a 



25 



