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Denver, <br /> Colorado (23 of 29 wells) <br /> • New England (13 of 35 yells) <br /> Dallas/Ft Worth, (4 0117 wells) <br /> Texas <br /> Reno, <br /> Nevada (6 of 28 wells) <br /> (4 of 22 wells) <br /> New York <br /> Las Vegas, (4 of 33 wens) <br /> Nevada <br /> Atlanta, (2 0123 wens and springs) <br /> Georgia <br /> 'Jbuquerque' 0 of 24 wells) <br /> New Mexico <br /> 0 10 20 30 40 50 60 70 8o 90 100 <br /> PERCENTAGE OF WELLS WITH MTBE <br /> Figure 3 Frequency of detection of MTBE In shallow ground water from Urban Land-Use Study areas, 1993-94 <br /> Texas, Las Vegas, Nevada, Atlanta, Georgia, and whereas the maximum concentration in shallow <br /> Albuquerque, New Mexico (fig 3) In agncultural ground water to agricultural areas was 13 gg/L The <br /> areas,MTBE was detected in southem Colorado, New median value for urban areas Ices below the reporting <br /> England, and eastern Pennsylvarua. The maximum level of 0 2 µg/L, however, flits median was estimated <br /> . concentration of MTBE detected to shallow ground to be 0 02 gg/L using the maximum-Uelthood <br /> water to urban areas were over 100 µg/L. (fig 4) estimator(Helsel and Hirsch, 1992) <br /> Denver I <br /> Colorado <br /> New England 4224 <br /> , <br /> Dallas/FL Werth 134- + + -f- <br /> Texas <br /> Nevada �), + t + + <br /> Albany, 16)}m++ + <br /> New York <br /> Las Vegas, 4 2 9) Lis <br /> Nevada <br /> Atlanta, 21). + ; (6) Number of samples with _ <br /> Georgia ; w concentrations less than <br /> Albuquerque, <br /> Cd the reporting level <br /> 23 ; <br /> New Mexico , <br /> 01 1 10 100 1,000 10,000 100,000 <br /> MTBE CONCENTRATION (µg1Q <br /> Figure 4 Concentrations of MTBE in shallow ground water from Urban Land-Use Study areas, 1993-94 <br /> 8 A Prwilminary Assessment of the Occurrence and Possible Sources of MTBE In Ground Water <br />