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5.0 STRUCTURE REMOVAL The only remaining structure at the Harney Lane Sanitary Landfill is a metal maintenance building with a restroom (about 675 sq.ft. ) . This structure will be moved to another site for reuse. The foundations will be removed after closure activities are completed, and the waste will be disposed of at the new North County Recycling Center and Sanitary Landfill. 6. 0 DECOMMISSIONING ENVIRONMENTAL CONTROLS In 1988, EMCON Associates performed an Air Quality Solid Waste Assessment Test (SWAT) . EMCON installed seven gas probes solely for the SWAT. These probes will not be incorporated into the postclosure monitoring plan. EMCON decommissioned five of the seven existing gas wells at the Harney Lane Landfill on October 11, 1991. Two other existing gas wells scheduled for decommissioning could not be located. To decommission each well, the probe casing was first pulled from the ground. The original well boring site was then redrilled to a depth at which native soil, rather than well construction material, returned to the surface on the auger, indicating that the bottom of the original boring had been reached. The borehole was then filled to the surface with a nine-sack concrete slurry. Materials from the decommissioned probes were disposed of on site. The current groundwater monitoring network will remain intact and be maintained for the 30 year postclosure monitoring period. After the monitoring period has expired, all monitoring wells will be decommissioned to comply with County ordinances and state regulations. Drainage controls will remain to prevent ponding and leachate production after closure. 7.0 SITE SECURITY A sign stating the date of closure and alternative waste disposal site was posted at the point of access on August 1, 1991. A sign was placed at the entrance on November 8, 1991 stating an emergency phone number and that copies of the closure and post closure plans are available for public viewing at the offices of the San Joaquin County Public Works Department located at 1810 E. Hazelton Avenue in Stockton, California. These signs will remain for at least 180 days from November 1, 1991. Also, a notice of closure of the Harney Lane Landfill site was published in the Lodi newspaper containing the information above on October 2 , 1991. 7