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August 1988 RWD for the landfill included as Appendix C to this RDSI. All drainage facilities were sized to accommodate the 100 storm event for the site. XI. Leachate Control: A description of leachate control measures employed at the landfill is contained on page 9 of the March 1988 Closure Plan for the site, which is contained Appendix B to the August 1988 RWD for the landfill included as Appendix C to this RDSI. XII. Groundwater Monitoring: The Corral Hollow Sanitary Landfill operates under Waste Discharge Requirements (WDR) No. 75-115 adopted by the RWQCB. These WDR were issued to the Corral Hollow Sanitary Landfill as a Class II-2 site. (According to the latest requirements of Subchapter 15 the designation for Class II-2 sites has been changed to Class III. ) The WDR for the landfill are in the process of being revised by the RWQCB. In August 1988 the San Joaquin County Department of Public Works prepared a RWD for the landfill. The City of Tracy Department of Public Works is in the process of submitting this RWD for the site to the RWQCB. This RWD, which is Appendix C of this engineering review, will be used by the RWQCB to develop new WDR for the site. In February of 1988, EMCON Associates prepared a report titled, Solid Waste Assessment Test Pro osal and Groundwater Monitorin Plan, for the site. This report was submitted to the RWQCB on February 25, 1988 and was also submitted to the CWMB and SJLHD on March 8, 1988. This report was a two part report which proposed procedures for performance of the GWSWAT at the landfill and also proposed a groundwater monitoring program to satisfy Subchapter 15. On April 5, 1988, the RWQCB approved the GWSWAT proposal and Groundwater Monitoring Plan for the site. A copy of this letter, which included minor amendments is included in Appendix H. The GWSWAT was performed at the site and submitted to the RWQCB on July 1, 1988. The implementation of the GWSWAT included installation of six (6) groundwater monitoring wells at the site. Three wells were installed in a shallow perched aquifer, which was encountered in area beneath the eastern portion of the landfill, and three deeper wells were installed in the first encountered regional aquifer beneath the site. Details on the groundwater monitoring results are contained in the GWSWAT for the landfill which was submitted to the CWMB and SJLHD on September 7, 1988. Copies of the transmittals documenting these submissions are contained in Appendix H. 12