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PAGE 2 <br />TABLE 72 (CONTINUED) <br />SUMMARY OP WATER QUALITY DATA <br />1990 <br />WELL TR-7A. MIDDLE SANDSTONE <br />PARAMETER MEAN STD. DEV. MAX. MIN. UNITS. N0. PERIOD <br />PRIMARY <br />ARSENIC DISSOLVED 1 .000 0 .000 7 .000 t. ODO UG/L 7 6/90 <br />CADMIUM DISSOLVED <10 .000 0 .000 <t0 .000 <t0. 000 UG/L 1 6/90 <br />LEAD DISSOLVED <20 .000 0 .000 <20 .000 <20. 000 UG/L t 6/90 <br />MERCDRV D]SSOLVED 0 .400 D .000 0 .400 0. 400 UG/L t 6/90 <br />SELENIUM DISSOLVED <7 .000 0 .000 <7 .000 <7. 000 UG/L t 6/90 <br />SECONDARv <br />ZINC DISSOLVED <10 .000 0 .000 <t0 .000 <10. 000 UG/L t 6/90 <br />IRON DISSOLVED <20 .000 0 .000 <20 .000 <20. 000 UG/L t 6/90 <br />MANGANESE DISSOLVED 10 .000 0 .000 10 .000 10. 000 UG/L t 6/90 <br />TRACE METALS <br />BORON DISSOLVED 30 .000 0 .000 30 .000 30. 000 UG/L t 6/90 <br />MOLYBDENUM DISSOLVED <50 .000 0 .000 <50. 000 <50. 000 UG/L t 6/90 <br />NUTRIENTS <br />NITROGEN NITRATE <0 .020 0 .000 <0. 020 <0. 020 MG/L t 6/90 <br />NITROGEN N03+N02 <0. 020 0. 000 <0. 020 <0. 020 MG/L I 6/90 <br />U = MICRO <br />