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Cease and Desist Order R 13-XXXX - 7 - San 7 -San Joaquin County Department of Public Works Corral Hollow Sanitary Landfill San Joaquin County 39. This Order also allows the Discharger to initially remediate the VOCs in the groundwater by stopping the source of VOCs (through control of landfill gas) coupled with natural attenuation of the VOCs already present in the groundwater. The success of the natural attenuation will be measured by the VOC concentrations in perimeter groundwater monitoring wells MW-9A, 10A, and 11A. The gas extraction system is intended to control the source at the compliance boundary and keep VOCs from entering groundwater and further degrading the vadose zone and shallow groundwater. However, if after two years of additional LFG extraction, VOC concentrations do not show a statistically significant decrease in onsite groundwater monitoring wells MW-5 and MW-8, then this Order requires the Discharger to install one of the three treatment systems proposed in the EFS (air sparging/vapor extraction, groundwater extraction/air stripping, or groundwater extraction/GAC treatment). REGULATORY CONSIDERATIONS 40. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Edition, revised September 2009 (hereafter Basin Plan), designates beneficial uses, establishes water quality objectives, and contains implementation plans and policies for all waters of the Basin. 41. The designated beneficial uses of the underlying groundwater, as stated in the Basin Plan, are domestic, municipal, agricultural, and industrial supply. 42. Surface water runoff from the site drains to sedimentation basins located northwest and southeast of the landfill as shown in Attachment A. The basins detain storm water for sedimentation control during the rainy season and are normally dry during the summer months. The southeast sedimentation basin can discharge to Corral Hollow Creek. The facility is permitted to discharge storm water to surface waters under a separate WDRs Order 97-03-DWQ , Waste Discharge Requirements for Discharges of Storm Water Associated with Industrial Activities (NPDES General Permit CAS000001). 43. Surface water that leaves the site drains to Corral Hollow Creek, a tributary of the San Joaquin River. Corral Hollow Creek is an intermittent stream with flows that dissipate during the summer months into the alluvium south of Tracy. As described in the Basin Plan, the beneficial uses of the San Joaquin River are municipal and domestic supply; agricultural supply, industrial supply, industrial process supply, and water contact recreation. 44. Water Code section 13301 states in part, When a regional board finds that a discharge of waste is taking place or threatening to take place in violation of requirements or discharge prohibitions prescribed by the regional board or the state board, the board may issue an order to cease and desist and direct that those persons not complying with the requirements or discharge prohibitions (a) comply