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Cleanup and Abatement Order R5-2008-0714 Forward Landfill 40 San Joaquin County 18. To summarize, the Austin Road Landfill VOC plume may have polluted downgradient drinking water supply wells at the Northern California Youth Authority facility. A groundwater extraction and treatment system and a landfill gas extraction system have been installed and are operating at the landfill. The June 2008 groundwater monitoring data from the Northern California Youth Authority supply wells and the landfill's groundwater monitoring wells indicates that pollutants in groundwater are still present. The groundwater extraction system has not contained the entire VOC plume. 19. Groundwater quality data and flow direction measurements provided by the Discharger indicate that the groundwater treatment system is undersized and unable to prevent the migration of the VOC plume. 20. Prohibition A (4) of WDRs Order No. R5-2003-0049 states: "The discharge shall not cause the release of pollutants or waste constituents in a manner which could cause a condition of nuisance, degradation, contamination, or pollution of groundwater to occur." Consequently, the detection of VOCs in any monitoring well is a violation of the WDRs. 21. This Order requires the Discharger to: (a) evaluate the vertical and lateral extent of groundwater impacts; (b) upgrade the corrective action system such that it prevents the constituents of concern associated with the release of waste from the landfill from passing the point of compliance of the waste management unit; (c) restore the water quality of the polluted aquifer; and (d) supply replacement water to any facility and or residence with a water supply that has been affected by the release of waste from the landfill such that concentrations exceed MCLs established by the U.S. EPA, to the extent such exceedances are not naturally -occurring or attributable to other sources. 22. The Discharger's data indicate that the release from the Austin Road Landfill has impacted the beneficial uses of the monitored aquifer downgradient of the landfill property. The data show that all three supply wells at the Northern California Youth Authority have concentrations of tetrachloroethylene that exceed the public health goal of 0.06 ug/l. The highest concentrations of tetrachloroethylene detected in supply well #4 at the NCYA exceed the US EPA Primary MCL of 5 ug/I. 23. The wastes detected at the Austin Road Landfill and NCYA are solvents used in the dry cleaning and other processes and breakdown products that are not naturally occurring, and some are known human carcinogens. The presence of with tetrachloroethylene, trichloroethylene and cis-1,2-dichloroethylene in groundwater has impaired the beneficial uses of the groundwater.