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? ? (copy) ft 1/ Loe Angeles, April 28, 1911, Mr. R. E. Wells, General Manager, Los Angeles, Dear Sir:- Replying to your letters of March 23rd and April 18th, with reference to For®. 30, 597, for concrete pipe between springs and reservoir at Las Vegas, Mr, Jessup advises ®e that he hat furnished Hr, Cochran sample .of water fro® city hydrants at Las ^egas to enable hie to make analysis and that he will continue to send samples of water from ||| springs and fro® the hydrants periodically, as instructed. With reference to including in the form an item covering proposed erection of house over the springs; this does not appear to have been.authorised, but Mr. jaseup outlines the reason for thus enclosing the eprings in. his letter cf April 27th to me, which 1 quote below: "In regard, to the waiter of leaving off form 30 the covering "for the soring at the source of the water supply, I believe "it would be a mistake to do this. While probably no one would "claim that sunshine alone would damage the water for domestic "use, yet the sunshine and air is what causes the algae and "various forms cf vegetable and .animal matter to germane t-e and •grow* These results of sunshine and air in turn become "deleterious. The same reason for having tfci water conducted ?tkexwaterfrom the reservoir at the spring in the closed concrete "pipe to the pcint of delivery in the town applies to having "the reservoir at the spring well enclosed in order to keep out "sunshine and air that cause the various obnoxious growths above "referred to, and for the additional reason that the contamina- "tion of various kinds can reach the water in an open pool or "reservoir that it would be impossible to do so if the water "flowed from the fissures of the rocks in the earth direct into "the pipes without coming into the open air. Aside froa this "it will keep tramps and in fact people who claim to be civil- "ised from using the pool for bathing purposes, as they are "frequently found doing in the summer time. The small additional "cost to enclose the small basin around the spring to prevent