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<br />,-, ". <br />, ." ":, .", {,[4 <br />~.;~--~~-;.,;g.-<,"~-~ ~. <br /> <br />. <br /> <br />. <br /> <br />N <br />l-" <br />~j <br />r..o <br /> <br />There have bee I sev~ral areas of environmental concern that have been <br /> <br />brought to our attention from revi ews of the draft envi ronmenta 1 impact <br />statement. We are aware of these concerns and are attempting to resolve <br />these issues. Let me briefly review some of the actions we have taken <br /> <br />since the Act was signed into law on June 24, 1974. <br /> <br />1 . GROUND-WATER DRAW DOWN <br /> <br />Ground-water levels in Yuma Valley have already started to decline asa <br />result of pumping by Mexico in the Mexicali Valley and on the Sonora Mesa <br />along with United States pumping of the existing Yuma Mesa Well Field and <br />Yuma Valley drainage wells. From June 1972 to June 1974 ground-water <br />elevations have dropped approximately 1 foot at San Luis, 1/2 foot at <br />Gadsden, 2 feet at Somerton, and as much as 8 feet along the Yuma Mesa <br />escarpment about 2-1/2 miles southeast of Somerton. <br /> <br />Analog model studies indicate that after 10 years of pumping from the <br /> <br />Mexican well field alone, the ground-water elevation at San Luis will be <br /> <br />reduced at least 10 feet, at Gadsden about 4 feet, and at Somerton about <br /> <br />3 feet. The installation and operation of the two boundary well fields, <br /> <br />in addition to presently operating Mexican and United States wells, will <br /> <br />accelerate drawdown of ground-water levels in the area overlying the <br /> <br />ground-water reservoir. After 10 years of pumping combined ground-water <br /> <br />8 <br /> <br />1""-. ,_, ':'li. ;;. l" ~ # ~ " <br /> <br />~ ~, -.";;u~.~ ,~-~;,;-- ,-,::,.....;;~_:d>L <br /> <br />~ .1,' -'. ' <br /> <br />, ";-A. <br /> <br />... ....',,-il< <br /> <br /> <br /> <br />"' - '~, <br />.:;', <br />