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Table 1 Monitoring Well Sampling, Destructions and Replacements Rough and Ready Island Stockton, California Most Recent Sample Analytical Data Damaged Well Proposed Monitoring Well Current Monitoring Well Unable To Be Other compounds with Proposed Replacement Site Sampled for Screen Interval (ft bgs) Cis-1 2-DCE Vinyl Chloride exceedances of DTSC Tap Proposed Replacement Cluster Wells to be Sample Date Monitoring Well Screen VOCs before (ug/L) (ug/L) water or MCL screening Monitoring Well Sampled 1 Interval (feet bgs) Destruction criteria (excluding Arsenic) 10-20 (screen will be adjusted W-036 X 18.8 to 28.8 8/20/2019 5 37 Barium - 1.1 mg/L New Monitoring Well to first groundwater encountered) 1 IAS-16 W-047 X 36 to 40 8/21/2019 0.22J 6.3 Barium - 2 mg/L New Monitoring Well 30-40 Gross beta -56.3 pCi/L W-065 X 11 to 14 8/19/2019 0.79 J 2.1 Barium - 1.4 mg/L 4 Site 39 W-066 X 21 to 26 8/19/2019 0.96J 2.5 Barium - 1.9 mg/L New Monitoring Well 15-25 W-067 X 30 to 34 8/19/2019 0.54 J 0.3 J Barium - 1.8 mg/L 5 Site 39 I W-070 I X I I 7 to 9 I 9/16/2015 I 1.3 <0.1 I none W-069 Existing Well 18-25 W-172 X 5 to 10 9/25/2014 4.8 <0.1 none 10-20 An additional deeper well may 10 IAS-07 W-174 X 20 to 25 8/22/2019 0.19 J <p,22 Barium -2.3 mg/L New Monitoring Well also be installed pending the results of the background W-224 X 32 to 37 8/22/2019 0.11 J <0.22 Barium -2.5 mg/L metals evaluation W-175 X 20 to 30 8/13/2018 0.15 J <0.22 none 11 IAS-11 W 222 36 to 39 9/22/2014 <0.1 <0.2 none New Monitoring Well 10-20 22 IAS-16 W-037 X I 4 to 9 8/15/2018 51 <0.22 none W-048 Existing Well 19-23.5 W-206 X 4 to 14 9/15/2015 7.4 <0.2 none New Monitoring Well 30-40 W-226 X 18 to 23 8/23/2019 620 610 none 23 IAS-16 W-228 X 30 to 37 8/21/2019 920 920 none New Monitoring Well 80-90 26 IAS-02 W-141 10 to 15 10/21/2008 <0.25 <0.25 none None NA W-144 25 to 35 -- -- -- --