CORRESPONDENCE_2003-2005 - Laserfiche WebLink

Home Browse Search

1.0 INTRODUCTION 1.1 PROJECT BACKGROUND Bryan A. Stirrat & Associates (BAS) has been retained by Allied Waste Industries (Allied) to prepare a Work Plan to remediate landfill gas (LFG) migration along the Forward Landfill's western property boundary. This Work Plan also includes an evaluation of the effectiveness of the proposed remediation approach. C Fl� In 2003, Title 27 perimeter gas monitoring probes were installed around the boundary of Forward Landfill. Two of the probes installed, GP -8 and GP -9, are located in the western boundary of the southern portion of the site, see Figure 1. LFG system improvements have been installed in various phases within WMU D-00, D-01, and D-02, which are waste cells directly east of probes GP -8 and GP -9. With over 40 vertical LFG extraction wells installed in these cells, readings taken from GP -8 and GP -9 were exceeding regulatory limits. Ten additional gas extraction wells were installed in native soil along the western perimeter boundary, outside the lined limits of the existing cells, to bring the site into compliance. The LFG extraction wells installed furthest to the south have successfully reduced the levels of methane below regulatory limits in GP -8. However, high levels of methane are still being encountered in probe GP -9. On the eastern portion of the site, WMU A, B, and C are unlined cells that pre -date subtitle D regulations. In 1987 an intermediate liner system was installed over portions of WMU C and the western face of WMU B to segregate waste from cells D-87, D-88, and D-89. Eighteen gas extraction wells have been installed in WMU B, but no gas extraction system improvements have been installed below the intermediate liner. As such, BAS believes gas is being produced from this area and migration is occurring to the west below WMU D-00, D-01, and D-02. The Forward Landfill in San Joaquin County, California, is an existing waste disposal and resource recovery facility. The landfill and transfer station/resource recovery facility were permitted in 1973. The landfill is owned and operated by Forward, Incorporated, a subsidiary of Allied Waste Industries. In September 2000, Forward Incorporated purchased the Austin Road Landfill from the City of Stockton and has combined the two landfills into one. The former Austin Road Sanitary Landfill, which is comprised of the most northerly portion of the landfill, was originally opened in 1954 and has operated continuously until its recent closure in 2002. The Forward Landfill is located at 9999 South Austin Road in Manteca, California at approximately Latitude 37 52' 94" and Longitude 121 52' 59". The site is located in Section 3 of Township 1 S, Range 7E, Mount Diablo Baseline and Meridian (MDB&M) and Section 34 of Township 1 N, Range 7E MDB&. The Assessor's Parcel Numbers for the site are 181-150-07, 181-150-08, 181-150-09, 181-150-10, 201-060-01, 201-060-02, 201-060-03, and 201-060-05. 1 Installation Work Plan to Remediate landfill Gas Migration ):\Allied\Forward\Workplan\Forward Evaluation - rev4.doc:9/15/2004