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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2015-0012-043 7 <br />SAN JOAQUIN COUNTY PUBLIC WORKS <br />SAN JOAQUIN COUNTY <br />CONTINGENCY PLAN <br />5. The Contingency Plan is to consist of the following steps: <br />(1) All ozone injection will cease. <br />(2) The sampling frequency will increase to monthly in any affected Treatment, <br />Transition, or Compliance Zone well(s). <br />(3) Should exceedances continue during 2 subsequent monthly sampling events <br />either well MW -1 or MW -2 will be used for low -flow batch extraction of <br />groundwater into a portable tank. <br />(4) Ozone sparging will resume only once breakdown/byproduct concentrations have <br />decreased below Action Levels, and it can be demonstrated that concentrations <br />do not pose a risk to human health or the environment. <br />(5) The ozone injection program may be modified to limit the production of <br />breakdown/byproducts, e.g. periodic switching between ozone and air -only <br />sparging. However, no changes to the injection program are to be made without <br />Central Valley Water Board staff concurrence. <br />FIELD MONITORING <br />6. In addition to the above sampling and laboratory analyses, each time a monitoring <br />well or remedial well is sampled, monitoring of field parameters shall performed as <br />specified in Table 3. <br />Table 3: Field Monitoring Parameters <br />All wells that are purged shall be purged until pH, temperature, conductivity and <br />dissolved oxygen are within 10% of the previous value. <br />Field test instruments (such as those used to test pH and dissolved oxygen) may be <br />used provided that: <br />(1) The operator is trained in proper use and maintenance of the instruments, <br />Practical <br />Parameters <br />Units <br />Quantitation <br />Analytical <br />Limit <br />Method <br />Groundwater Elevation <br />ft (Mean Sea <br />0.01 <br />Measurement <br />Level <br />Oxidation -Reduction <br />Potential <br />mV <br />10 <br />Field Meter <br />Electrical Conductivity <br />PS/cm <br />50 <br />Field Meter <br />Dissolved Oxygen <br />m /L <br />0.2 <br />Field Meter <br />pH <br />pH Units (to 0.1 <br />0.1 <br />Field Meter <br />units <br />Temperature <br />'F/°C <br />0.1 <br />Field Meter <br />All wells that are purged shall be purged until pH, temperature, conductivity and <br />dissolved oxygen are within 10% of the previous value. <br />Field test instruments (such as those used to test pH and dissolved oxygen) may be <br />used provided that: <br />(1) The operator is trained in proper use and maintenance of the instruments, <br />