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<br />trapped in the soil probably circulates in some degree <br />through vegetation, litter, and back to the soil. No <br />evidence of the biological concentration of silver iodide <br />through food chai ns has been found. When soi 1 was <br />sprinkled with water dosed with silver iodide in concentra- <br />tions from one to several million times greater than that <br />in seeded rain, retE~ntion of most of the silver in the <br />upper 2 cm of the soi 1 was observed. However, it is not <br />known whether the ScUlle woul d be true at the much lower <br />concentrations characteristic of seeded rain.' [1, p. <br />B-3J <br /> <br />"Appendix B of the programmatic Statement discussed natural or <br />background levels of silver in the environment and environmental <br />dispersion of silver by human activity. Many field and labora- <br />tory studies of silver have been sponsored by Project Skywater. <br />These studies are discussed in the programmatic Statement. They <br />i nc 1 ud e : <br /> <br />"Field monitoring of silver concentration in precipitation, <br />surface waters, and vegetation in order to establish <br />baseline values and investigate possible evidence of <br />accumulations due to cloud seeding <br /> <br />U'Laboratory investigation of the effect of silver iodide on <br />certain strains of bacteria in order to establish the <br />nature of these effects and the thresholds of silver <br />concentration at which they become perceptible <br /> <br />"Laboratory investigation of the effect of silver iodide on <br />fi sh in order to estab 1 ish the nature of these effects <br />and the thresholds of silver concentration at which they <br />become perceptible <br /> <br />"Laboratory investigation of the effect of silver iodide on <br />di gest ive processes of two cl asses of animal s that feed <br />on vegetation possibly subject to contamination by silver <br />iodide in order to discover possible effects of silver <br />iodide on the microf10ra involved in the digestive <br />process <br /> <br />"Laboratory and field investigation of the effects of <br />silver compounds on test plots of vegetation and soil in <br />order to discover any possible effects of silver iodide <br />or other silver compounds on biological processes within <br />these plots <br /> <br />"Laboratory and field investigation of the effects of <br />silver iodide on vegetation in the immediate vicinity of <br />the site of silver iodide smoke generators that had been <br />operated for substantial periods in the past, in order to <br />assess possible changes in biological processes resulting <br /> <br />23 <br />