Upper Control Limit definition

Upper Control Limit. (UCL) means a value greater than the maximum value of a chemical or physical parameter that can be attributed to natural fluctuations and analytical variability. UCL parameters and amounts are determined from the baseline sampling and agreed upon by the Administrator and the operator prior to initiation of mining. UCLs are used to determine when there is movement of recovery fluid out of authorized areas or unapproved changes to a chemical or physical parameter. For certain parameters, such as pH, a UCL may be defined as an acceptable range of values.
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Examples of Upper Control Limit in a sentence

  • Oversize 1.5 5.4 0.0 1.6 5.8 0.0 2.0 7.8 0.0 Overthick 10.4 24.3 0.0 9.2 20.9 0.0 8.1 17.4 0.0 Pinchips 5.0 11.7 0.0 3.7 8.9 0.0 6.1 12.8 0.0 Fines 0.2 1.3 0.0 0.3 1.5 0.0 0.6 2.4 0.0 Bark 0.3 1.2 0.0 0.8 3.9 0.0 2.3 7.7 0.0 Density 20.1 25.3 14.9 21.5 25.5 17.4 21.0 25.6 16.5 Moisture 49.8 64.3 35.4 44.5 58.0 30.9 43.2 54.5 31.9 UCL = Upper Control Limit LCL = Lower Control Limit Oversize = chips retained on a 45mm (13/4" nominal) round hole.

  • See Reference Document 4, Upper Control Limit Calculation, for additional detail.

  • A wellfield average may be used for a commercial permit with Upper Control Limits determined using the procedures outlined in Reference Document 4, Upper Control Limit Calculation .