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MONITORING AND REPORTING PROGRAM Page 4 ORDER NO. R5-2015-0012-073 HUMAN SERVICES AGENCY 145 SOUTH SUTTER STREET, STOCKTON, SAN JOAQUIN COUNTY FIELD MONITORING In addition to the above sampling and laboratory analyses, each time a monitoring well or remedial well is sampled, monitoring of field parameters shall be monitored as specified in Table 3. Table 3: Field Monitoring Parameters Practical Analytical Parameters Units Quantitation Method Limit Groundwater Elevation ft Mean Sea Level 0.01 Measurement Dissolved Oxygen mg/L 0.2 Field Meter Oxidation-Reduction Potential mV 10 Field Meter Electrical Conductivity pS/cm2 50 Field Meter Temperature °F/°C 0.1 Field Meter pH pH Units 0.1 Field Meter to 0.1 units ft= feet; mg/L= milligrams per liter; mV= millivolts; pS/cm2= microsiemens per square centimeter; °F= degrees Fahrenheit; °C= degrees Celsius All wells that are purged shall be purged until pH, temperature, conductivity and dissolved oxygen are within 10% of the previous value. Field test instruments (such as those used to test pH and dissolved oxygen) may be used provided that: (a) The operator is trained in proper use and maintenance of the instruments; (b) The instruments are calibrated prior to each monitoring event; (c) Instruments are serviced and/or calibrated by the manufacturer at the recommended frequency; and (d) Field calibration reports are submitted as described in item (b) of the "Reporting" section of this MRP. ACTION LEVELS Following collection of baseline groundwater samples collected prior to commencement of BOS-200 injection, Action Levels will be issued in a subsequent Central Valley Water Board staff directive for Suite B constituents established in Table 2 above. Action Levels will be 120% of maximum baseline concentrations. Should concentrations of these constituents exceed the established Action Levels in Compliance Zone wells, the Contingency Plan is to be implemented.