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Battle Mountain Resources—San Luis SL-SOP-Groundwater Well Decommissioning <br /> STANDARD OPERATING PROCEDURES �711REVISION: 0;-May 6, 2019 <br /> Table of Contents <br /> 1. PURPOSE AND SCOPE .............................................................................................................4 <br /> 2. RESPONSIBILITY.........................................................................................................................4 <br /> 3. PREPARATION.............................................................................................................................4 <br /> 4. DECOMMISSIONING METHODS..............................................................................................5 <br /> 4.1. GROUTING IN-PLACE.......................................................................................................................6 <br /> 4.2. CASING PERFORATING/GROUTING IN-PLACE................................................................................7 <br /> 4.3. CASING PULLING .............................................................................................................................7 <br /> 4.4. OVER-DRILLING...............................................................................................................................8 <br /> 5. SELECTION PROCESS AND IMPLEMENTATION................................................................9 <br /> 5.1. BEDROCK WELLS ............................................................................................................................9 <br /> 5.2. UNCONTAMINATED OVERBURDEN WELLS...................................................................................10 <br /> 5.3. CONTAMINATED OVERBURDEN MONITORING WELLS/PIEZOMETERS ........................................10 <br /> 5.4. TELESCOPED RISER......................................................................................................................11 <br /> 6. LOCATING AND SETTING-UP ON THE WELL...................................................................11 <br /> 7. REMOVING THE PROTECTIVE CASING..............................................................................11 <br /> 8. SELECTING, MIXING, AND PLACING GROUT...................................................................12 <br /> 8.1. STANDARD GROUT MIXTURE........................................................................................................13 <br /> 8.2. SPECIAL MIXTURE .........................................................................................................................13 <br /> 8.3. GROUT MIXING PROCEDURE........................................................................................................13 <br /> 8.4. GROUT PLACEMENT......................................................................................................................13 <br /> 9. BACKFILLING AND SITE RESTORATION...........................................................................14 <br /> 10. DOCUMENTATION....................................................................................................................14 <br /> 11. FIELD OVERSIGHT....................................................................................................................15 <br /> 12. REFERENCES ............................................................................................................................15 <br /> 12.1. QUALITY ASSURANCE PROJECT PLAN (QAPP) FOR THE BATTLE MOUNTAIN RESOURCES <br /> SAN LUIS PROJECT, SAN Luis, COLORADO ................................................................................15 <br /> 12.2. FIELD SAMPLING PLAN (FSP) FOR BATTLE MOUNTAIN RESOURCES SAN LUIS PLAN..............15 <br /> 12.3. HEALTH AND SAFETY PLAN FOR THE BATTLE MOUNTAIN RESOURCES SAN LUIS <br /> PROJECT, SAN Luis, COLORADO.................................................................................................15 <br /> 12.4. AMERICAN SOCIETY FOR TESTING AND MATERIALS,A.S.T.M. D 5299-99, STANDARD <br /> GUIDE FOR THE DECOMMISSIONING OF GROUND WATER WELLS, VADOSE ZONE <br /> MONITORING DEVICES, BOREHOLES, AND OTHER DEVICES FOR ENVIRONMENTAL <br /> ACTIVITIES .....................................................................................................................................15 <br /> SL-SOP Well Decommissioning EA, Inc. <br /> Battle Mountain Resources, Inc. Page 2 of 21 Ma 6, 2019 <br />