Sorry if I wasn't clear about the selenium, but I believe there is still a connection to depleting aquifers, the origin of selenium is from natural geologic deposits as I understand it, but the problem is sort of two fold by lowering water tables (ie depleting aquifers) and concentrating salts and selenium via underground drainage, the resulting contaminates are then fed back into the remaining water table (along with new salts) and eventually settle in lower portions of the aquifers. This means that the selenium plumes are not just downstream as in the kesterton case, but also back in the fields they were 'drained from'. The particular plume in question extends through a good part of the northern half of the central valley. I'll look for a map of the plume sometime , but I haven't run across it in a while there's probably a link somewhere online - but there are connections between selenium concentrations and pumping the aquifers down....