Appendix 9: Ecological Compensation Ratio (ECR) and mitigation quantum for streams Boffa Miskell Ltd | Waihi North Project: Freshwater Ecological Assessment | [Company] Table 9-1: Calculated mitigation quantum for proposed stream impacts within the project, as determined using the SEV and ECR methodology. Impact Site Mitigation Site ECR Length of impacted stream Average width impacted stream Length of compensation available Average width of compensation stream Proportion of impact reach compensated Comments Willows Farm Tributary 2 Mataura Stream upper tributary 2.9 390 m 0.6 m 2,379 m 0.6 m 101% Utilises 1,150m of available mitigation 101% of impact accounted for. North Rock Stack TB1 / OHE_T4 OHE_T4 (upper) and OHE_T5 2.97 1,039 m 2.06 m 293 m 0.745 m 3.43% Utilises all available mitigation at OHE_T4, OHE_T5 and RUA (downstream – unvegetated). 102.18% of impact accounted for. NRS_DIVERISON 1.11 575 m 0.745 m 17.93% RUA_T4 1.81 440.1 m 2.21 m 25.13% RUA (trib to diversion) 1.81 70 m 2.21 m 3.99% RUA (Ruahorehore Downstream) 11.44 2,396 m 2.21 m 21.67% RUA (Ruahorehore downstream – unvegetated) 1.81 475.5 m 2.45 m 30.02% NRS Small Tributaries (OHE_T5, OHE_T6 and OHE_T7) NRS_DIVERSION 1.11 349 m 0.74 m 390 m 0.745 m 100.03% Utilises remaining 390 m of NRS_DIVERSION. 100.03% of impact accounted for. Gladstone Pit Gladstone_Tributary RUA (Ruahorehore Downstream) 15.37 47 m 1.68 M 551 m 2.21 m 100.06% Utilises remaining 551 m of RUA (Ruahorehore Downstream)
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