CORRESPONDENCE_2006-2007 - Laserfiche WebLink

Home Browse Search

CENTRAL VALLD REGIONAL WATER QUALIT ONTROL BOARD INSPECTION REPORT DATE: 27 April 2007 FACILITY: North County Recycling Center and Sanitary Landfill DISCHARGER: San Joaquin County Public Works LOCATION & COUNTY: San Joaquin County CONTACT(S): Michael Carroll INSPECTION DATE: 26 April 2007 INSPECTED BY: Todd Del Frate ACCOMPANIED BY: SUMMARY: The purpose of the site inspection was to observe the exposure and removal of a 4'x6' section of the landfill liner system located within Module 3. The purpose of the activities conducted was for material testing (shear strength) of the in place liner system for eventual vertical expansion of the landfill. Met Michael Carroll of San Joaquin County Public Works and other landfill personal at the site of liner exposure. San Joaquin County Environmental Health was also in attendance. The area of exposure had been pre-dug to approximately 1.5 feet just above the filter fabric (Figure 1). The area was moisturized and let set over night (Figure 2) to soften the compacted operations layer. Landfill employees continued to carefully excavate the area using flat-bladded shovels and hand-digging to clear dirt from the filter fabric (Figure 3). The excavated area was eventually cleared of dirt and the filter fabric exposed for removal (Figure 4). Once the area was marked for removal, Mr. Carroll proceeded to carefully cut the filter fabric, paying strict attention to the cutting devise and the HDPE liner beneath (Figure 5 and 6). Once the filter fabric was removed, the geonet was then carefully cut out as shown in Figures 7 and 8. Once the filter fabric and geonet samples had been cut and removed, the HDPE liner was exposed as shown in Figure 9. In accordance with the work plan prepared by San Joaquin County Public Works, a panel of GCL was placed over the exposed HDPE liner. The GCL panel was cut to provide a six-inch overlap of the remaining filter fabric as shown in Figure 10. To protect the liner and geonet from potential dirt debris from entering the removed liner area, the GCL barrier was backfilled with bentonite powder prior to backfilling the excavation (Figure 11 and 12). Staff requested San Joaquin County Public Works to backfill and compact the area excavated. Staff requested a photograph of the completed work (attached as Figure 13). Approved: