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-1 <br /> Battle Mountain Resources—San Luis SL-SOP-Groundwater Well Decommissioning <br /> STANDARD OPERATING PROCEDURES REVISION: 0-May 06,2019 <br /> ATTACHMENT 13-2 <br /> MONITORING WELL DECOMMISSIONING PROCEDURE SELECTION <br /> START <br /> Is well in bedrock or <br /> Bedrock <br /> only in overburden? <br /> Yes Open hole in rock? No <br /> Use special grout <br /> Grout ces screened intery to penetrate <br /> bedrock part transect multiple Yes sand pack. <br /> of well. No ater-bearing zones Grout riser to <br /> top of rock. <br /> Overburden Only <br /> N Is overburden Yes <br /> contaminated? <br /> --N Confining layer present. Confining layer Yes <br /> present? <br /> No <br /> Will riser be pulled? Yes Single— Single riser stem or <br /> telescoped? <br /> Yes N Could contamination Yes <br /> ross confining layer? <br /> Install Telescoped <br /> temporary <br /> swell seal compromised. casing to <br /> confining <br /> layer. <br /> No —Yes s well seal compromised. <br /> No <br /> Will riser be pulled? Yes Yes <br /> Perforate and/or <br /> No Pull riser while N Pull riser while grout riser in <br /> grouting. place as <br /> grouting. appropriate. Design and <br /> implement <br /> special <br /> procedure. <br /> N s well seal compromised. <br /> Did riser break off <br /> No---------- during pulling? -- - -Yes <br /> Yes <br /> Over-drill, Auger out <br /> Perforate and/or remove riser, Remove remaining part <br /> grout riser in and temporary temporary of well. Grout <br /> place as casing(if and remove <br /> appropriate. present),grout casing if present. temporary <br /> hole. casing. <br /> Backfill and restore the site. <br /> SL-SOP Well Decommissioning EA, Inc. <br /> Battle Mountain Resources, Inc. Page 19 of 21 May 6, 2019 <br />