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was determined to occur as much as 1,300 times the recommended limit, and ar- senic was observed to occur as much as 6 times the recommended limit. Indi- cations of selenium poisoning include nervousness, vomiting, loss of hair and fingernails, and hypertension. High selenium concentrations in plants and water have reportedly caused poisoning of humans and livestock on the reserva- tion (Beath, 1962). Symptoms of arsenic poisoning include fatigue and loss of energy. Standard treatment processes of public water supplies have little or no effect on removing selenium and arsenic. The locations of water samples that contain selenium and arsenic in excess of recommended standards are shown on plates 1 and 2. Nitrate and nitrite-plus-nitrate as nitrogen in excess of the standards has been determined locally throughout the reservation. Newborn infants can be affected by high nitrate or nitrite-plus-nitrate as nitrogen concentrations in drinking water and milk, resulting in a condition known as "blue babies." Older children and adults are usually not affected by high nitrate or nitrite- plus-nitrate as nitrogen concentrations. Standard treatment processes of pub- lic water supplies have no effect on the removal of nitrate and nitrite-plus- nitrate as nitrogen from drinking water. Individuals with water supplies that contain selenium, arsenic, nitrate, and nitrite-plus-nitrate as nitrogen in excess of health limits need to con- sider another source of drinking water. Sampling water from newly drilled wells and analyzing the water will indicate whether or not the water is suit- able for drinking. If the constituents mentioned above are found to occur in excess of the recommended concentrations, an alternative source of water needs to be considered. SYSTEM OF WELL NUMBERING The well numbers in tables 1 and 2 indicate the well locations as shown on plates 1 and 2. The numbers are based on the U.S. Bureau of Land Manage- ment system of land subdivision, and show the location of the well by quadrant, township, range, section, and position within the section. A graphic illus- tration of this method of well location is shown in figure 2. The first let- ter "N" preceding the location number means that the site is located in the area governed by the New Mexico principal meridian. The second letter indi- cates that quadrant in which the well is located. Four quadrants are formed by the intersection of the base line and the principal meridian--A indicates the northeast quadrant, B the northwest, C the southwest, and D the southeast. The first three-digit numeral indicates the township, the second three-digit numeral the range, and the third two-digit numeral the section in which the well is located. The letters following the section number locate the well within the section. The first letter denotes the quarter section, the second the quarter-quarter section, and the third the quarter-quarter-quarter sec- tion. The letters are assigned within the section in a counter-clockwise di- rection, beginning with (A) in the northeast quarter. Letters are assigned within each quarter section and within each quarter-quarter section in the 4