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Austin Unit Groundwater Monitoring Network Monitoring Point Monitoring Point I.D. Groundwater Monitoring Well — Background AMW-2 DMP Wells AMW-6, AMW-7, AMW-12, AMW-13, AMW-14 CAP Wells AMW-1, AMW-3, AMW-4, AMW-5, AMW-10, AMW-11, AMW-18, AMW-19, AMW-19B, 7898-A, 8106-A Surface Water Stations ASW -1, ASW -2 The Forward Landfill has been operated primarily as a Class II and Class III landfill since it opened in 1973. From the late 1970s to 1984, industrial wastes, consisting primarily of strontium and barium sludge, were accepted at the landfill and placed in Waste Management Unit A (WMU A). In 1984, the DTSC determined that WMU A should be closed as a hazardous waste management unit. The final cap was completed in 1989 (Kleinfelder 1999). A hazardous waste facility post -closure permit ("the initial post -closure permit") was issued for the Site on January 2, 1990. On February 25, 1994, Forward Landfill requested that the DTSC modify the initial post -closure permit to reduce the number of sampling events from eight per year (two quarterly) to four per year (one quarterly). DTSC approved this request ("Modification No. 1") in a letter dated March 2, 1994 (Kleinfelder 1999). On November 4, 1994, a revised post -closure maintenance plan (RPCMP) was submitted to the DTSC. The DTSC approved the RPCMP and issued Permit Modification No. 2. This modification superceded all of the requirements of the initial post -closure permit and Modification No. 1. The DTSC issued a revised Postclosure Permit on June 30, 2003. Forward Landfill implemented the Corrective Action Program for the site, which was based on a two-year proof period that began on June 7, 1995. WDR Order No. R5-2003-0049 was formally adopted RWQCB on March 14, 2003, which combined the former Austin and Forward Landfills into one landfill, now known as the Forward Landfill. Landfill personnel perform weekly inspections of the facility. As provided in Appendix A, these observations include identification of evidence of liquids entering or leaving the landfill, indications of ponding on the landfill or erosion of the landfill cover soils, and identification of strong landfill gas odors. With the exception of ponded water (which was pumped out), no unusual conditions were identified during the fourth quarter 2006 monitoring period, (see signed "Certification Statement" located inside cover page, after the Table Of Contents in this report). C D:\2003_021\ForwardAusdn_f06.doc\ 2 Geologic Associates