Don&#x27;t know about pH but very interesting read on history primarily from a civil engineering perspective - <a href="http:&#x2F;&#x2F;web.mst.edu&#x2F;~rogersda&#x2F;hoover_dam&#x2F;Civil_Eng-Nov-2010-Hoover_Dam.pdf" rel="nofollow">http:&#x2F;&#x2F;web.mst.edu&#x2F;~rogersda&#x2F;hoover_dam&#x2F;Civil_Eng-Nov-2010-H...</a>