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CENTRAL VALLEY69EGIONAL WATER QUALITY TROL BOARD INSPECTION REPORT DATE: 7 July 2009 FACILITY: Foothill Sanitary Landfill DISCHARGER: San Joaquin County Department of Public Works LOCATION & COUNTY: Linden, San Joaquin County CONTACT(S): Mike Carrol INSPECTION DATE: 25 June 2009 INSPECTED Y: Todd Del Frate ACCOMPANIED BY: Rob Hall SUMMARY: Purpose of the site visit was to inspect the removal of the operations layer to expose the rupture of the primary liner caused by the discharge of landfill gas condensate into the secondary sump. The rupture was believed to be at the boot where the secondary sump riser pipe penetrates the primary liner. Prior to the 25 June 2009 inspection, San Joaquin County (County) had conducted a minor excavation around the secondary sump riser pipe. This activity was conducted to make preliminary observations in the area where the believed rupture occurred. On 25 June 2009, the County expanded the excavation to expose the underlying Geocomposite and eventually the primary liner. The excavation was approximately 15' x 15', which exposed the area believed to be ruptured. As shown in the following photographs, significant care was taken to remove the operations layer and expose the Geocomposite and primary liner. Once the Geocomposite was cut the primary liner was exposed. Observations were made but no rupture of the primary liner was observed. The County could not identify a location, within the exposed area, where the liquid from the secondary sump could have discharged into the primary sump. The County recommended "No Further Action" be taken during this inspection and that additional information was needed to determine where the rupture is located. The County will be looking at thews-builts to determine where the seams of the next panels are. Additional excavation is warranted to locate the rupture in the primary liner. Approved: