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MEMORANDUM <br /> TO: Errol Lawrence, Devon Horntvedt, Glayden Berry, Julio Madrid, <br /> Melissa Chalona, James Witwer <br /> FROM: Judith Schenk, Ph.D. Senior Project Manager <br /> Bruce A. Lytle, P.E., President <br /> SUBJECT: West Pit Groundwater Model Update and Remediation Simulations <br /> DATE: July 23, 2020 <br /> PROJECT NO.: 1006-04 <br /> 1.0 INTRODUCTION <br /> This memorandum is an update on work that Lytle Water Solutions LLC ("LWS")has completed <br /> to date in collaboration with Hydrosolutions ("HYS") related to changes to the Battle Mountain <br /> Resources, Inc. ("BMRI") groundwater models of the San Luis mine site. The original model was <br /> developed by HYS and LWS has peer-reviewed the model, as well as providing some <br /> modifications to the model and running remediation simulations in conjunction with HYS. LWS <br /> memorandum "Update on West Pit Groundwater Modifications" (December 2019) discussed <br /> adjusting the bottom elevation and adapting the BASE model to MODFLOW-2005. The following <br /> tasks have been completed in addition to the those described in the earlier memo: <br /> 1. Reconfigure the bottom elevation; <br /> 2. Adjust model general-head boundary elevations; <br /> 3. Recalculate BF5 average pumping discharge; <br /> 4. Perform sensitivity analyses for each conceptual model; <br /> 5. Calibrate each conceptual model; <br /> 6. Evaluate and compare performance of each conceptual model; <br /> 7. Simulate remediation simulations for each of the three conceptual models; <br /> 8. Evaluate mass balance of groundwater flow in the West Pit; and, <br /> 9. Provide recommendations for future work <br /> 640 PLAZA DRIVE, SUITE 170 PHONE: 303-350-350-4090 <br /> HIGHLANDS RANCH, COLORADO B0129 FAX: 303-350-4095 <br /> WWW.LYTLEWATER.COM E-MAIL: LWS@LYTLEWATER.COM <br />