Wairau/Awatere Resource Management Plan Step 8: Calculate Adjusted Threshold Quantities Adjusted Threshold is calculated by multiplying the Base Threshold by the relevant Adjustment Factor. Record data on the Summary Sheet for Manual HFSP calculation. Step 9: Calculate Effects Ratio The Effects Ratio (R) is a dimensionless number. It is obtained by dividing the proposed quantity of a substance (Q) by the Adjusted Threshold (T). R = Q/T Record data on the Summary Sheet for Manual HFSP calculation and Total Effects Ratio: Manual Calculation Sheet: Attachment C5. The Effects Ratio of hazardous substances will form the basis for determining the Plan status of any particular activity, by reference to the hazardous facility threshold standard for the particular activity or site. Step 10: HFSP Calculations The HFSP calculation of a hazardous substance Effects Ratio is undertaken using the HFSP Evaluation Form (refer Attachment C3). Where several hazardous substances occur on a single site, it will be necessary to sum the individual Effects Ratios. Step 11: Determine Activity Status The Total Effects Ratio determines the Plan status of an activity involving hazardous substances when compared against trigger levels for zones. The Total Effects Ratio is determined by summing the individual ratio for each Effect Group. The highest Effects Ratio will determine the activities status: whether the activity is Permitted, Controlled, Discretionary or Non-complying. Where the activity is not Permitted it may be appropriate to review options to reduce the effects. This reduction may be achieved by reducing the number or quantity of substances held on site. App C - 12