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Cease and Desist Order R5- 13-XXXX - 2 - San 2 - San Joaquin County Department of Public Works Corral Hollow Sanitary Landfill San Joaquin County 6. Groundwater has been encountered in a deep zone approximately 300 to 350 feet bgs and is monitored by two wells (MW-6 and MW-7). Groundwater found in the deep zone flows northeast. 7. Currently, the Discharger's detection monitoring program for shallow and deep groundwater monitoring meets the requirements contained in Title 27. However, additional groundwater monitoring wells may be required if it is determined that there is additional evidence of groundwater impacts. 8. In 1991, volatile organic compounds (VOCs) (Trichlorofluoromethane and Tetrachloroethene) were first detected in groundwater samples collected from MW-5. The detection was confirmed in February 1992. Landfill Closure 9. In response to the detection of VOCs, the Discharger implemented a corrective action plan in 1995, which included the construction of the final cover for the landfill. 10. In September 2005, the County investigated to determine if refuse was present below the drainage ditch, the access road, and east of the road at the eastern edge of the landfill. Refuse was found below the ditch and the final closure cover was found not to extend to the ditch. It was determined that refuse was outside the permitted WMU boundary covering an area approximately 1.6 acres. 11. On 17 August 2007, the Discharger submitted a document delineating the extent of refuse within County and Caltrans properties. In a letter dated 27 August 2007, CalRecycle staff directed the County and Caltrans to cover the refuse in both the Caltrans and County property according to Title 27 in a common construction project. Central Valley Water Board staff reaffirmed this directive. Caltrans declined to participate in the closure project with the County. The County subsequently submitted design plans addressing only the uncovered refuse on County property. 12. In a 22 February 2011 meeting with Water Board staff, Caltrans and the County indicated a willingness to work together to extend the closure cover over the 1.6 acres of refuse identified outside of the existing closure cap. The parties had the option of either removing the waste outside of the cover or extending the cover to include the additional 1.6 acres. 13. In a letter dated 28 June 2011, the County stated that it has reached agreement with Caltrans to participate in a single project to extend the closure cover over the refuse on both properties. Caltrans reiterated this agreement in a letter dated 29 June 2011. 14. On 7 July 2011, the Executive Officer issued a Water Code Section 13267 Order to both the County and Caltrans requiring the submittal of plans to extend the closure