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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2015-0012-043 5 <br />SAN JOAQUIN COUNTY PUBLIC WORKS <br />SAN JOAQUIN COUNTY <br />5 Well sampled to evaluate migration of pollutants within the treatment zone. The <br />transition zone well(s) may or may not be within the zone of influence. <br />6 Well used to monitor compliance and for the presence of breakdown/byproducts of the <br />treatment migrating beyond the expected treatment area. <br />7 Wells used to monitor changes in natural background groundwater geochemistry in area <br />unaffected by oxidant injection. <br />8 To be sampled prior to startup (baseline). <br />9 All sampling conducted following a 3 -well volume purge. <br />Table 1B: Samplings Frequency (During Full -Scale Implementation) <br />Well Number' <br />Frequency2 <br />Constituent3 <br />Monitoring <br />Ob'ective <br />MW -1, MW -2 <br />Quarterly4,6 <br />Suite A, Suite B <br />Evaluation of <br />treatment <br />Evaluation of <br />MW -9, MW - 10 <br />Quarterly4,6 <br />Suite A, Suite B <br />treatment and plume <br />movement <br />Evaluation of adverse <br />MW -3, MW -4, MW -8 <br />Quarterly4,6 <br />Suite A, Suite B <br />migration of <br />contaminants <br />Evaluation of <br />MW -5, MW -6, MW -7 <br />Quarterly4,6 <br />Suite A, Suite B <br />background <br />conditions. <br />1 Well Numbers and location as shown on Figure 1 <br />2 i.e. weekly, monthly, quarterly, semi-annually, annually, other. Semi-annual sampling <br />occurs 1st and 3rd quarters, annual sampling occurs 1st quarter, biennial sampling <br />occurs every two years in 1 st quarter, with the first sampling during year two. <br />3 Constituent analytical methods are listed in Table 2 <br />4 Wells to be monitored for depth to water, presence of free product, and purge sampled <br />on a quarterly basis for at least one quarter after ozone injection has ceased to <br />determine if breakdown/byproducts of treatment developed. If results do not indicate <br />any development of breakdown/byproducts from treatment, no additional sampling will <br />be needed. <br />5 All sampling conducted following a 3 -well volume purge. <br />6 Should adverse water quality conditions occur due to the injection of oxidants, the <br />Contingency Plan detailed below shall be implemented <br />