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. ., . 7 Issue 15: Effects of Seeding Agents On Extractive Processes This issue arises from industries involved in the differential crystallization of minerals by solar concentration of brines. The concern is that suspp..nded solids bearing additional weather m::x:lification-derived silver v.Duld inhibit separation and purification of the desired chemicals. It is the consensus that this should lX)t be of concern and that the needed research be conducted by the industry. Recamendations ~ No research is recoIll'02l1ded. Issue 16: Seeding Agents As A Nuisance A nuisance, in a legal sense, could jnclude such factors as anxiety caused by the transport of a toxic substance to an area where a person might inhale or ingest it. Even though the concentration of 'b~e substance is below safe levels an individual might claim a nuisance had occurred in being deprived of his peace of mind. This is a legal issue and of no importance in an ecological sense. - Sorre minor concern may be e..'Pressed by the lay public and, in resp8nse to that concern, by legislative l::odies and ultimately by regulatory l::odies. Recomnendations No action or research is recorrmended. Issue 17: Increased Awareness of Silver Effects From The Other Sources Research in the area of silver seeding agent effects may result in increased awareness of ecological effects of other Ag discharges. Although the effect nay be indirect, certain industries such as the photographic, electronic, and fertilizer interests, as well as domestic and municipa.l waste treatment opera- tions c~ild benefit from the information which the research might make available. In addition, the availability of this information could effect them on a negative basis, as they might have to improve waste treatment processes and silver recovery effectiveness. Issue 18: Other Agents - Increased ArrDunts Required For Effect Comparable 'lb Ag I There appears to be sufficient evidence to suggest tha the growth rate in the use of alternate seeding agents (prinarily organic rraterials) will be greater than that of AgI. This may be due to experimentation to show the greate.r effec-" tiveness of organic material under some circumstances, resp:mses to environmen- tal concerns, or increased cost or supply shortages. While for the rrost part organic substances are preferable to AgI from an ecological standr:oint, the increase in the arrount of ma.terial dispersed (several orders of ma.gnitude) nay pose special problems. Concern al::out the anount used is not a problem by itself but \vill be an important consideration when related to ecological effects. It is recarm::mded that a study of the ecological effects of promising alternate seeding ID9terials be ll1itiated at an early time before widespread use is r~\ ~. ---..' ..-