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TABLE 4 SUMMARY OF MONTGOMERY WATSON'S MONITORING ROUNDS FOR METALS -- ARSENIC, CHROMIUM, AND MANGANESE -- <br /> ABOVE BACKGROUND CONCENTRATIONS (SEPTEMBER 1992 AND JANUARY 1993) (continued) <br /> DISSOLVED_Uµ9/0:. . TOTAL (F9/L) <br /> WELL NO. ARSENIC CHROMIUM. MANGANESE WELL NO.: ARSENIC CHROMIUM MANGANESE <br /> 9/92. 1/93 9/92 1/93 9/92 I 1/93: 9/92 11/93 9/92 1/93 9/92 -1/93 <br /> LM54 <2.3 NA 24.6 NA NA NA LM54 <2.3 NA 23.7 NA NA NA <br /> LM62 2.5-:. <2.0 <7.4 <7.4 NA 2.8 LM62 2.3. <2.0 <7.4 <7.4 NA 2.3 Ba <br /> LM101 5.4 -4.9 <7.4 <7.4 NA 61.3 LM101 5.0 6.7b <7.4 <7.4 NA 145- <br /> LM103 3.0- 2.8 <7.4 <7.4 NA 1.8 LM103 4.6 6.5b17.4 9.4 NA _83 Ba <br /> LM104 5.4. 5.2 <7.4 <7.4 NA 67.2 LM104 - 5.2 5.1 <7.4 <7.4 NA 51:9 <br /> LM106 <2.3 NA NA NA NA NA LM106 <2.3 NA 118 NA NA NA <br /> LM107 2.5 NA 22.3 NA NA NA LM107 _-'_2.3 ` NA 20.3 NA NA NA <br /> EPA MCL 50.0 100.0 50.00 EPA MCL =<2 <2.3 <br /> 100.0 SO.Oc <br /> DHS MCL/ DHS MCL/ <br /> ACTION LEVEL 50.0/5.0d 50.0 50.0c ACTION 50.0 SO.Oc <br /> LEVEL <br /> BACKGROUND <2.D - <2.3 16.6 - 24.1 3. BACKGROUND <br /> • <br /> C Secondary MCL for manganese. <br /> d California (Proposition 65) Action Level. <br />