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<br />000124 <br /> <br />the biosphere. The part of it that is trapped in the <br />soil probably circulates in some degree through vegeta- <br />tion, litter, and back to the soil. No evidence of the <br />biological concentration of silver iodide through food <br />chains has been found. When soil was sprinkled with <br />water dosed with silver iodide in concentrations from <br />one to several million times greater than that in <br />seeded rain, retention of most of the silver in the <br />upper 2 cm of the soil was observed. However, it is <br />not known whether the same would be true at the much <br />lower concentrations xharacteristic of seeded rain.' [4, <br />p. 8-3] <br /> <br />"Appendix 8 of the programmatic Statement discussed natural. <br />or background levels of silver in the environment and <br />environmental dispersion of silver by human activity. Many <br />field and laboratory studies of silver have been sponsored <br />by Project Skywater. These studies are discussed in the <br />programmatic Statement. They include: <br /> <br />"Field monitoring of silver concentration in precipita- <br />tion surface waters, and vegetation in order to estab- <br />lish baseline values and investigate possible evidence <br />of accumulations due to cloud seeding. <br /> <br />"Laboratory i nvesti gat i on of the effect of sil ver iodi de <br />on 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 invest i gat i on of the effect of silver i odi de <br />on fish in order to establish the nature of these <br />effects and the thresholds of silver concentration at <br />which they become perceptible. <br /> <br />"Laboratory invest i gat i on of the effect of sil ver i odi de <br />on digestive processes of two classes of animals that <br />feed on vegetation possibly subject to contamination by <br />silver iodide in order to discover possible effects of <br />silver iodide on the microflora involved in the diges- <br />tive 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 <br />to assess possible changes in biological processes <br /> <br />27 <br /> <br />---..,::,~ -----~~~- - ~~--~~~~-----------~~~- <br />