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COLORADO LEGACY LAND <br /> ,,. . <br /> TABLE 2A.GROUNDWATER SAMPLE FIELD PARAMETERS <br /> Field Parameters <br /> Location ID/ Static Depth to Water pH Temperature Conductivity ORP Dissolved Oxygen Notes/Location Description <br /> Sample ID Sample Date (ft btoc) (unitless) (°C (PS/cm mY m L <br /> MW-00 3/10/2020 6.58 7.25 4.3 242.9 153.1 9.32 Alluvial well. Above waste dumps,upstream of site. <br /> MW-0 3/10/2020 12.58 7.18 8.2 565 132.6 7.43 Alluvial well.Toe of south waste rock pile. <br /> MW-1 N/A. N/A N/A N/A N/A N/A N/A Abandoned in December 2019 during alluvial valley excavation <br /> MW-2 N/A N/A N/A N/A N/A N/A N/A Abandoned in December 2019 during alluvial valley excavation <br /> MW-3A N/A N/A N/A N/A N/A N/A N/A Abandoned in December 2019 during alluvial valley excavation <br /> MW-4 N/A N/A N/A N/A N/A N/A N/A Removed in 2008. <br /> MW-5 N/A N/A N/A N/A N/A N/A N/A Removed in 2008. <br /> MW-6 Not Sampled,No Access3. N/A __ __ Alluvial well. Near former Sump#2. <br /> MW-7 Not Sampled,Insufficient Volumez. 10.3 - - __ _ Alluvial well. Near Sump#1 <br /> MW-8 N/A N/A N/A N/A N/A N/A N/A Not sampled,replaced with well MW-12. <br /> MW-9 N/A N/A N/A N/A N/A N/A N/A Abandoned in December 2019 during alluvial valley excavation <br /> MW-10 N/A N/A N/A N/A N/A N/A N/A Not sampled,bentonite in screened interval. Replaced with MW-13.Background well. <br /> MW-11 N/A N/A N/A N/A N/A N/A N/A Not sampled,bentonite in screened interval. Replaced with MW-14.Background well. <br /> MW-12 Not Sampled,Dry'. Dry - _ _ Below Sump#1.Alluvial well. <br /> MW-13 Not Sampled,No Access3. N/A - -- Nitrogen purge.Replaced MW-10.Previous Sample ID=L1.Background well. <br /> MW-14 Not Sampled,No Access3. N/A "" -' - Nitrogen purge.Replaced MW-11. Previous Sample ID=L2.Background well. <br /> MW-15 Not Sampled,No Access3. N/A - -- _ Nitrogen purge.Previous Sample ID=L3.Bedrock well. <br /> MW-16 Not Sampled,No Access3. N/A N/A N/A N/A N/A N/A Not sampled,no pump in well. Monitor water level only. Previous Sample ID=L4.Bedrock well. <br /> MW-17 Not Sampled,No Access3. N/A -- -- -- __ __ Nitrogen purge.Previous Sample ID=L5. <br /> MW-18 3/4/2020 162.77 7.66 10.4 668 -214.7 4.80 Previous Sample ID=L6.Bedrock well,installation targeted Illinois fault zone in alluvial valley. <br /> MW-19 3/6/2020 17.7 6.90 15.2 645 146.7 1.72 Toe of south waste rock pile.Previous Sample ID=L7. <br /> MW-20 Not Sampled,No Access3. N/A -- -- __ __ __ Usually dry.Top of south waste rock pile. <br /> Sample collected from spigot inside water treatment plant. This is the water treatment plant intake <br /> Raw Feed Not Sampled,Plant inactive¢ N/A 7.33 18.6 2,894 -110.3 1.77 from the mine pool.Previous Sample ID=Mine Refill. <br /> Sample collected from spigot inside water treatment plant. This is the combined,collected sump <br /> Sumps 10/17/2019 N/A 7.36 16.6 1,060 62.7 6.02 water. <br /> Notes: <br /> 'No water present in Well. MW=Monitoring Well <br /> WWater present in well,insufficient volume to collect sample. ORP=Oxidization Reduction Potential <br /> 3Snow made wells inaccessible to sampler <br /> 4Pumps to plant inoperable.Raw feed unable to be collected. <br /> VS/cm=microSemiens per centimeter <br /> °C=degrees Celsius <br /> ft btoc=feet below top of casing <br /> ID=Identifier <br /> mg/L=milligrams per liter <br /> mV=millivolts <br /> PAGE 7 OF 12 <br />