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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) W-178 X 5 to 10 9/17/2014 <0.3 <0.2 none 36 Site 38 W-185 X 17 to 22 9/14/2015 <0.1 0.5 none New Monitoring Well 15-25 W-191 X 33 to 40 9/17/2014a <0.1a Barium - 1.8 mg/L 8/21/2009' W-201 X 9 to 14 9/19/2014 <0.1 <0.1 none 37 IAS-13 New Monitoring Well 25-35 W-202 X 18 to 25 9/19/2014 <0.1 <0.1 none W-204 X 28 to 43 8/23/2019 <0.1 0.27 J Barium - 1.3 mg/L New Monitoring Well 70-80 W-154 X 6 to 11 10/21/2008 <0.25 <0.25 none 39 IAS-15 New Monitoring Well 50-60 W-156 X 16 to 21 8/15/2018 <0.1 <0.22 none 46 Site 38 W-330 X 20 to 25 10/17/2011a10a <0.2a Barium - 1.1 mg/L New Monitoring Well 30-40 8/24/2009b IAS-07 W-054 X 5 to 10 9/17/2015 <0.1 <0.1 none New Monitoring Well 10-20 Site 9 W-035 X 5.5 to 10.5 10/21/2008 <0.25 <0.25 none New Monitoring Well 10-20 Individual Wells not in cluster Need for replacement well to Site 37 W-322 X 10 to 15 3/1/2006 <0.1 <0.12 none be determined after NA completion of background metals evaluation Notes: 1. Screening criteria for other COCs include California MCLs for Barium (1 mg/L), Nickel (0.1 mg/L) and Gross Alpha (15 pCi/L), DTSC screening levels for 4,4-DDE (0.046 ug/L- non cancer endpoint) and EPA trigger levels for Gross Beta (50 pCi/L). --= no data available in database none = no exceedances of screening criteria in most recent sample mg/L- milligrams per liter Pink highlight=wells and piezometers that are damaged and unable to be sampled Purple highlight=wells that are planned to be sampled one last time for VOCs prior to destruction Orange highlight =wells that are not planned to be sampled prior to destruction NA= Not Applicable