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DocuSign Envelope ID: D07924E6-3D94-4398-A066-B683COBAB33E <br /> 3.0 QA/QC Summary <br /> 3.1 Sample QA/QC <br /> Client: Elk Ridge Mining and Reclamation, LLC <br /> Date tests start: 11/5/20, 11/17/20, 1/19/21 <br /> Chain of custody received........................................................................................................Yes <br /> Chain of custody completed.....................................................................................................Yes <br /> Samples received within holding times....................................................................................Yes <br /> Samples at correct temperature (0-6°C or sampled same day received)...............................Yes <br /> Samples used within 36 hours of collection.............................................................................Yes <br /> 3.2 Test Acceptability <br /> Control performance criteria met(Tables 1 &2) ..............................................................Yes/No* <br /> *The 1.0 g ethanol/g SO4 P.promelas test did not meet criteria for survival and the 0.5 g ethanol/g SO4 <br /> with/without lime pre-softening C. dubia test did not meet criteria for survival and reproduction. <br /> Table 2: Chronic control performance criteria requirements and test results by species. <br /> Test Treatment Survival Reproduction/Growth <br /> Species (g Ethanol/g SO4) Test Acceptable Test Acceptable <br /> (%) (%) (#or mg) (#or mg) <br /> 0.5 100 41.7 <br /> 1.0 100 39.1 <br /> C. dubia 80 >_15.0 <br /> 0.25 100 21.4 <br /> 0.5 with/without lime pre- 60 9.1 <br /> softening <br /> 0.5 95 0.388 <br /> 1.0 70 0.303 <br /> P.promelas 80 0.250 <br /> 0.25 97.5 0.362 <br /> 0.5 with/without lime pre- 92.5 0.400 <br /> softening <br /> Tests renewed within acceptable timeframe ...........................................................................Yes <br /> At least 60% of control organisms in chronic C. dubia test released at least 3 broods...Yes/No* <br /> *The 0.5 g ethanol/g SO4 with/without lime pre-softening C. dubia test did not meet criteria. <br /> GEI Consultants,Inc. 6 February 2021 <br /> Ecological Division Whole Effluent Toxicity Test Report <br /> Stantec-Elk Ridge Mining and Reclamation,LLC <br />