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<br />- 6 - <br /> <br />. <br /> <br />b) South Gila Volley Pumping. The second largest contributor of return flows <br />to the river below Imperial Dam and above Morelos Dom, is the pumping <br />of ground waters from the South Gila Valley. For the 5th operating year, <br />quantities are estimated to amount to 59,000 acre-feet -- a decrease of <br />3,000 acre-feet from quantity pumped in the 4th year. The salinity <br />records indicate a decrease in the average annual concentration from <br />2510 to 2420 ppm. Comparative records are tabulated as follows and <br />are shown graphically on Exhibit 6. <br /> <br /> SOUTH GILA PUMPED DRAINAGE <br /> Water Salinity <br /> Period Year AF ppm <br /> Previous year to <br /> Agreement Operations 1965 59,000 2,510 <br /> 1st year of Operation 1966 71,000 2,600 <br /> 2nd year of Operation 1967 62,000 2,600 <br /> 3rd year of Operation 1968 69,000 2,650 <br /> 4th year of Operation 1969 62,000 2,510 <br />. 5th year of Operation 1970 59,000 2,420 <br /> - <br /> 5. Deliveries to Mexico on Ari zona Land Sou nda ry <br /> <br />Salt <br />Tons <br /> <br />200,000 <br /> <br />251,000 <br />220,000 <br />248,000 <br />211,000 <br />195,000 <br /> <br />The deliveries to Mexico.across the Arizona Land boundary at San Luis for the <br />5th year amounted to 136,800 acre-feet, with average salinity of 1550 ppm.* <br />Of the total amount del ivered, 66,700 acre - feet, or 49%, comprised pumped <br />waters from wells in the Yuma Valley. Exhibit 7 shows the total annual quantities <br />beginning in 1961, and recorded salinities. <br /> <br />6. Summary of 5th Year Operations <br /> <br />Operations during the 5th year reflect continued reduction in the salinity of <br />'waters delivered to Mexico above Morelos Dam. There was a reduction from <br />the 4th year of about 11 ppm resulting from United States operations under <br />Minute No. 218. <br /> <br />* Last 2 months estimated. <br /> <br />. <br />