Question : From a biological 

 point of view, have any of the in- 

 vestigations that have been carried 

 out there looked at the transport or 

 restriction of particular material 

 via the culverts or associated with 

 the culverts? 



Answer : In this part of the study 

 I have addressed the issue of carbon 

 export through these culverts, and we 

 found that carbon export was perhaps 

 97 percent in dissolved form, and 

 maybe 3 percent in particulate form. 

 The output of carbon through those 

 culverts in all forms of organic 

 carbon amounts to about a ton a day. 

 So these culverts are presently 

 supplying something like one to two 

 percent of regional supply to the 

 estuary. 



Question : Richard Baily, De- 

 partment of Housing and Urban Devel- 

 opment. I have two questions. First, 

 what's the mechanism by which you 

 would control the use of pesticides, 

 and so on, that might run off in the 

 lake, and will it be deed restricted, 

 or what? 



Answer : One way that we would 

 have in our power to incorporate 

 would be a property owner's associa- 

 tion and some deed restrictions which 

 would place those kind of limitations. 

 Then the question is, what would be 

 the target substances? We would 

 probably just rely on the Federal 

 government to determine which were 

 the most important. 



Question : The second question 

 is--if you got about 44 inches of 

 evaporation on your budget going out, 

 have you compared that to a similar 

 size and type area with natural 

 evaporation or sheet flow, and how do 

 they compare? 



Answer : The 44 inches is 70 

 percent of pan, and that's what we 



use for a lake. For the natural 

 areas in the region, it's about 75 

 percent of rainfall. Rainfall is 

 about 55 inches, so 75 percent of 55 

 is something less than 44-40 inches. 

 So the lake evaporation would be a 

 little bit more, probably, than the 

 evapotranspiration from the natural 

 area . 



Question: I have two questions. 

 First of all, have you considered, or 

 is it even a problem, with the po- 

 tential work that they may be doing 

 in the Golden Gate Estates area, and 

 the installation of the flash boards 

 to help retain some of the water in 

 that area? And secondly, in the 

 application of pesticides the current 

 method is by aerial spraying and also 

 spraying by truck. How are you going 

 to control the application of Baytex 

 which they are currently using ? 

 Baytex is a non-specific killer of a 

 number of organisms and if this gets 

 into the lakes, aren't you going to 

 have considerable trouble biolog- 

 ically with the organisms that will 

 and won't grow there? In terms of 

 possibly having weeds growing because 

 there's no organisms to eat them? 



Answer: I can take a stab at 

 that in terms of Golden Gate. I 

 think that anything that slows down 

 the loss of water to the estuary is a 

 positive development. I think that 

 somebody stated that the water going 

 over the discharge point that is 

 shown on that big photo over there is 

 enough to supply a city of four 

 million and it is water that is lost 

 to the estuary. The second question 

 on pesticides, we don't have a lot of 

 control over what the county does in 

 terms of their mosquito control 

 district. On the local basis, 

 though, the home owners association 

 will own the perimeter of the lakes, 

 that is, the association will own 

 the 15 feet of lots that front on the 



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