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<br />. <br /> <br />002533 <br /> <br />. <br /> <br />As a matter of fact, we have many communities in the state <br /> <br />of Colorado which have municipal water supplies of unacceptable <br /> <br />qualities when measured by the standards of the United States Public <br /> <br />Health Service, :1;1; W~$ fo~ this reason that we requested the Office <br /> <br /> <br />of Saline Watet ~o aS$ist tis in exploring and developing techniques <br /> <br />, '. <br />:fOr improvil1~,the munlc:ipa1 water supplies ,of various cOmnll1nities. <br /> <br />With funds Pr9Vided by the Office of Salihe Water, the state of <br /> <br />. ' , <br />Colorado contrac!ted with the Ki\u\ 1\. \1hite Company of Denver to <br /> <br />donduc!t a r'$,earch project in this field, with the assistance of the <br /> <br />UR$ ~e~~a~t;p,.'eom];:)~y9f fi,an Nflteo, California. Both companies are <br /> <br />..-. ! <br /> <br />affiliates of the URS sy.stel1\li! CO~fatiol1 of san Mateo,' <br /> <br /> <br />The water quality goal. est.a91isheq for th~E1 $t~dy was to <br /> <br /> <br />produce potable water cont~ning total ~issoJ.ved solids less than <br /> <br /> <br />1,000 ppm. with a total hardness below 200 parts. The reduction of <br /> <br />unacceptable concentrations of elements and compounds within this <br /> <br />range, such as nitrates. was include~ in the crite:t:ia. The United <br /> <br />States Public Health standard for domestic water is not more than <br /> <br />500 parts per million. Public Health standards also set limitations <br /> <br />on constituent parts of the total, For instance, the standard states <br /> <br />that the sulfate concentrations should not exceed 250 parts. It <br /> <br />did not appear to us to be in the realm of economic considerations <br /> <br />to at~empt to reduce the water of the selected communities within <br /> <br />-2- <br />