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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2015-0012-043 SAN JOAQUIN COUNTY PUBLIC WORKS SAN JOAQUIN COUNTY Table 2: Analytical Methods 1 Or an equivalent EPA method that achieves the maximum Practical Quantitation Limit. 2 All concentrations between the Method Detection Limit and the Practical Quantitation Limit shall be reported as an estimated value. 3 Dissolved metals include: As, Cr, Fe, Mn and are collected in laboratory - supplied non -preserved containers, relinquished to the lab for filtering and preservation prior to analysis. 4 Anions include: bromide and bromate. ACTION LEVELS 4. Based on the groundwater samples collected prior to commencement of ozone injection, Action Levels will be established in a subsequent directive letter by Central Valley Water board staff for selected breakdown/byproducts. Should concentrations of these constituents exceed the established Action Levels in Compliance Zone wells, Central Valley Water Board staff are to be notified immediately, and the Contingency Plan is to be implanted. Action Levels may be revised by Central Valley Water Board staff should background concentrations change significantly over the course of remediation. Maximum Practical Constituent Method' Quantitation Limit2 Frequency u /L SUITE A TPH GC/MS 50 BTEX, MTBE, TAME, As indicated DIPE, ETBE, TBA, 1,2- EPA 0.5-10 in Tables 1A DCA, EDB 82608 & 1 B SUITE B EPA Metals, dissolved 3 200.8 0.25-1000 Hexavalent Chromium 218 6 0.2 As indicated EPA in Tables 1A Anions4 300.1 5-1000 & 1 B TDS 2540 10 1 Or an equivalent EPA method that achieves the maximum Practical Quantitation Limit. 2 All concentrations between the Method Detection Limit and the Practical Quantitation Limit shall be reported as an estimated value. 3 Dissolved metals include: As, Cr, Fe, Mn and are collected in laboratory - supplied non -preserved containers, relinquished to the lab for filtering and preservation prior to analysis. 4 Anions include: bromide and bromate. ACTION LEVELS 4. Based on the groundwater samples collected prior to commencement of ozone injection, Action Levels will be established in a subsequent directive letter by Central Valley Water board staff for selected breakdown/byproducts. Should concentrations of these constituents exceed the established Action Levels in Compliance Zone wells, Central Valley Water Board staff are to be notified immediately, and the Contingency Plan is to be implanted. Action Levels may be revised by Central Valley Water Board staff should background concentrations change significantly over the course of remediation.