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fr = free <br />WAD = weak acid dissociable <br />dh = dissolved, human health standard (Basic Standards for Ground Water, 5 CCR 1002 -41) <br />ddw = dissolved, drinking water standard (Basic Standards for Ground Water, 5 CCR 1002 -41) <br />tdw = total, drinking water standard (Basic Standards for Ground Water, 5 CCR 1002 -41) <br />dag = dissolved, agricultural standard (Basic Standards for Ground Water, 5 CCR 1002 -41) <br />tag = total, agricultural standard (Basic Standards for Ground Water, 5 CCR 1002 -41) <br />Field Parameters for Groundwater Monitoring <br />Parameter <br />Precision/Units <br />Water Level <br />0.01 ft <br />Temperature <br />0.1 °C <br />pH <br />0.01 S.U. <br />Electrical Conductivity <br />1 µmhos /cm <br />Dissolved Oxygen <br />0.01 mg /L, 1% <br />ORP <br />1 my <br />