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<br />15 <br /> <br />CHEMICAL QUALITY OF SURFACE WATER <br /> <br />W <br />"1 <br />rv <br />o <br /> <br /> <br />N <br />QD <br /> <br />AVERAGE ANNUAL <br />TDS (ppm) <br />E::::2l < 250 <br />c::J < 500 <br />c:::::J < I 000 <br />""",,-:, < 2000 <br />.".,.,.,,,.,, < 3000 <br />[IllI!ll > 3000 <br /> <br />-GREEN <br />DIVISION <br /> <br />ARIZONA <br /> <br />o <br />I <br />o <br /> <br />50 <br />I <br />80 <br /> <br />IOOmi. <br />I <br />160 km. <br /> <br />Figure 1.7. Quality of surface water in the Upper Colorado River Basin <br />(after Reir and Wadell, 1973), <br /> <br />:i.,,;.,i <br />