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ADS-RPT-2021-14 <br />ESS-Nederland Mine _ 60 <br />November 4, 2021 <br />200 Lake Drive, Glasgow, DE 19702 302.731.1700 Fax 302.731.1701 <br />www.gravertech.com <br />Proprietary and Confidential <br />Page 6 of 8 <br />Figure 1. The Cd kinetic test at a V/m ratio of 1000 mL/dry gram of media. The test is limited by <br />the method detection limit. A 10-minute contact time (at a very low concentration) only <br />removes about 10% of the contaminant. At 60 minutes the % removal is much higher, but the <br />calculation is limited by the detection limit. Note that the lines drawn are just connecting the <br />dots to emphasize the change in efficiency. The connecting line is not a fit for the data; it is just <br />a visual cue.