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Cease and Desist Order R5 13 -XXXX - 12 - San 12 -San Joaquin County Department of Public Works Corral Hollow Sanitary Landfill San Joaquin County conducted using the tests recommended in the USEPA Unified Guidance 2, such as Mann-Kendall, Theil-Sen, or Linear Regression; and • If the Discharger elects to install additional LFG extraction wells or complete additional enhancements to the LFG system, then the report shall contain a description of the work accomplished during the quarter. 4. For the First Quarter 2015 quarterly report (due by 1 May 2015): If the total VOC concentration in either groundwater monitoring well MW-5 or MW-8 does not show a statistically significant decrease (using the data collected between the Second Quarter 2013 and the First Quarter 2015), then the report shall contain a brief evaluation of the three treatment options described in Finding 39 and shall state which option will be implemented if concentrations do not decrease by the Third Quarter 2015. 5. For the Third Quarter 2015 quarterly report (due by 1 November 2015): If the total VOC concentration in either groundwater monitoring well MW-5 or MW-8 does not show a statistically significant decrease (using the data collected between the Second Quarter 2013 and the Third Quarter 2015), then the report shall include a work plan to install the treatment option identified in the First Quarter 2015 report. The work plan shall include a schedule for implementation not to exceed 15 June 2016. 6. If the Discharger was required to submit the work plan described in Item 5, above, then by 15 July 2016 the Discharger shall submit a Groundwater Remediation Installation Report summarizing the installation of the groundwater treatment system identified in Item 4, above 7. The Discharger may propose concentration limits greater than background (CLGB) provided the Discharger makes the demonstration that it is technically and economically infeasible to comply with the water standard in accordance with Title 27, section 20400(c) and (e). 8. Corrective action will be deemed complete once compliance with the water standard has been met. To terminate corrective action, the Discharger shall demonstrate to the satisfaction of Water Board staff that concentrations of all constituents of concern have been reduced to levels below the established concentration limits throughout the entire zone affected by the release (Title 27, Section 20430 (f)). The Discharger shall submit this demonstration in a technical report. In accordance with California Business and Professions Code sections 6735, 7835, and 7835.1, engineering and geologic evaluations and judgments shall be performed by or under the direction of registered professionals competent and proficient in the fields 2 March 2009 Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities-Unified Guidance