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Cease and Desist Order R5213-XXXX - 11 - San Joaquin County Department of Public Works Corral Hollow Sanitary Landfill San Joaquin County groundwater. The Plan shall describe steps that have been taken to modify the physical components or operating elements of the landfill gas system to prevent landfill gas, to the extent possible, from entering groundwater throughout the entire footprint of the landfill and surrounding vadose zone adjacent to and beneath the landfill. The Report shall include: a. A description of the measures that have been taken to provide and maintain, to the extent possible, continuous negative pressure' in each landfill gas extraction well for each interval monitored; b. Certification by an independent third party that those measures have been fully implemented; and c. An Operational Procedures document that describes on-going procedures that will be implemented to ensure that landfill gas extraction is continuously optimized. The document may reference requirements from the regulations pertaining to Methane Emissions from Municipal Solid Waste Landfills contained in the California Code of Regulations, title 17, Subchapter 10, Article 4, Subarticle 6, section 95460 et seq. 3. Monitoring Reporting Program (MRP) R5-2013-0013 requires the submittal of quarterly groundwater monitoring and semi-annual corrective action progress reports. Beginning with the Fourth Quarter 2013 report (due by 1 February 2014), each of the quarterly reports shall include the following additional information: • The landfill gas system operational and monitoring data listed in Attachment A to this Order; • Time versus concentration graphs for total VOCs in groundwater monitoring wells MW-5, 8, 9A, 10A, and 11A. The starting point shall be the 2nd Quarter 2013 monitoring data; • An estimation of when the VOC concentrations in each of the above five wells will meet the Water Quality Protection Standard (WQPS) or an approved Concentration Limit Greater than Background (CLGB); •The results of a statistical trend test performed for each of the above five wells. The trend tests will be used to determine if the total VOC concentrations show a statistically significant upward or downward trend. The statistical tests shall be For purposes of this Order, "continuous negative pressure" means that each wellhead shall be operated under a vacuum (negative pressure) except(a)when a well has been decommissioned with approval of the Assistant Executive Officer, (b)when necessary to prevent or control a landfill fire, (c) during maintenance, construction, or well raising activities on a well, or(d)when the gas collection system has been temporarily shut down for maintenance or repairs.