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• • PAGE Z • <br /> TABLE 78 (CONT INUED) <br /> SUMMARY OF WATER QUALITY DATA <br /> 1992 <br /> SUMMARY OF WATER D UALITY DATA, N0. 9 MINE WE LL, TWENTVMILE SANDSTONE <br />PARAMETER MEAN STD. DEV. MAX . MIN, UNITS. N0. PERIOD <br />PRIMARY <br />ARSE N3C DISSOLVED 1 .000 0.000 1 .000 1.000 UG/L 3 6/92 <br />CADM3UM DISSOLVED <5. 000 O.OOD <5 .000 <5.000 UG/L 1 6/92 <br />LEAD D3550LVED <20. 000 0.000 <2D .000 <2D.000 UG/L 1 6/92 <br />MERC URV DISSOLVED c0 .100 0.000 <O ,t00 <Q,t00 UGJI L 6f82 <br />SELENIUM DISSOLVED c7, 000 0.000 <1 .000 <1.000 UG/L 1 6/92 <br />SECONDARY <br />ZINC DISSOLVED 300. 000 0.000 300 .000 300.000 UG/L 5 6/92 <br />IRON DISSOLVED <20. 000 0.000 <20. 000 c20.000 UG/L 1 6/82 <br />MANGANESE DISSOLVED 40. 000 0.000 40. 000 40.000 UG/L 1 6/82 <br />TRACE METALS <br />BORON DISSOLVED 30. 000 0.000 30. 000 30.000 UG/L I 6/92 <br />MOLYBDENUM DISSOLVED <50. 000 0.000 <50. 000 <50.000 UG/L I 6/92 <br />NUTRIENTS <br />NITROGEN NITRATE <0. 020 O.DDO <0. 020 c0.020 MG/L 1 6/92 <br />N]7ROGEN NITRITE <0. 010 0.000 <0. 010 <0.010 MG/L 1 6/92 <br />NITROGEN N03+N02 <0. 020 0.000 <0. 020 <0.020 MG/L 1 6/92 <br />U = MICRD <br />