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• PAGE 2 • <br /> TABLE 18 (CONT INUED) <br /> SUMMAR Y OF WATER DUALITY DATA <br /> WATER YEAR 1991 <br /> N0. 9 MINE WELL, TWEN TVMILE S ANDSTONE <br />PARAMETER MEAN STD. DEV. MAX , MIN. UNITS. N0. PERIOD <br />PRIMARY <br />ARSENIC DISSOLVED 3. 000 ~ 0.000 3 .000 3 .000 UG/L 1 6/91 <br />CADMIUM DISSOLVED <5. 000 0.000 <5 .000 <5. 000 UG/L 1 6/91 <br />LEAD DISSOLVED <20 .000 0.000 <20 .000 <20 .000 UG/L 7 6/91 <br />M ER CURV DISSOLVED <0. 100 0.000 <0 .100 <0. 100 UG/L 1 6/91 <br />SELENIUM DISSOLVED <1. 000 0.000 <1 .000 <1. 000 UG/L 7 6/91 <br />SECONDARY <br />ZINC DISSOLVED 120. 000 0.000 720 .000 120. 000 UG/L 1 6/91 <br />IRON DISSOLVED <20. 000 0.000 <20 .000 <20. 000 UG/L 1 6/91 <br />MANGANESE DISSOLVED 60. 000 0.000 60 .000 60. 000 UG/L 1 6/91 <br />TRACE METALS <br />BORON DISSOLVED 30. 000 0.000 30 .000 30. 000 UG/l 1 6/91 <br />MOLYBDENUM DISSOLVED <50. 000 0.000 <50 .000 <50. 000 UG/L 1 6/97 <br />NUTRIENTS <br />NITROGEN NITRATE <0. 020 0.000 <0 .020 <0. 020 MG/L 1 6/91 <br />NITROGEN N03+N02 <0. 020 0.000 <0 .020 <0. 020 MG/L 1 6/91 <br />U = MICRO <br />