CORRESPONDENCE_1992-1993 - Laserfiche WebLink

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Site Investigation- Sarney Lane Sanitary Landfill Page 2 of 3 Facility Nos- 39-AA-0003 along, the landfill's western perimeter fencing adjacent to the migrant farm , labor housing complex. Methane concentrations exceeding 30% were detected in GMWs 1,2, & 4 while a concentration greater than 15% was detected in GMW #3 (see attached map for gas monitoring results) . Pursuant to .14 CCR 17783 (a) (2) , "the concentration of methane gas migrating from the landfill must not exceed 5% by volume in air at the facility property boundary or an alternative boundary in accordance with Section 17783.5" Additionally, 14 CCR 17783 (x) (3) requires that "trace gases shall be controlled to prevent adverse acute and chronic exposure to toxic and/or carcinogenic compounds. " In 6/26/92 correspondence, Board staff requested the operator to submit a workplan to implement control measures that would limit the migration of landfill decomposition gas beyond the landfill's boundary. The operator responded in 8/3/92 correspondence that "before construction of the labor camp, the County anticipated possible gas migration from the landfill and required that a venting system be installed in each labor camp structure: ll This was followed by Board staff correspondence of 9/8/92 which noted that "the aforementioned control system [venting] is considered to be a secondary landfill gas control system and does not prevent the offsite migration of landfill gas. The primary purpose of having a landfill gas collection and control system for the landfill is to ensure that landfill gas does not migrate offsite in a concentration exceeding 5% by volume. A landfill gas collection and control system is required to be installed, operated, and maintained within the property boundaries. . .since landfill gas (methane)- concentrations have been detected periodically at greater than 5% by volume at the landfill property boundary. " The operator responded in 9/28/92 correspondence that "on October 20, 1992, the San Joaquin County Board of Supervisors will consider hiring a consultant to- design a landfill gas control system for the Harney Lane Landfill. If approved by the Board of Supervisors, design of the system will begin shortly thereafter. Installation of the system will be coordinated with approval of the Closure Plan and construction of final cover. " During the 12/4/92 investigation, the operator indicated that the County Board of Supervisors had approved the hiring of a consultant to conduct the aforementioned gas control-design work and that a draft gas control plan would be prepared by March 1993 and is anticipated to be submitted to the LEA and Board staff by April 1993 . The operator also indicated that quarterly gas monitoring of all GMWs, onsite structures, and offsite structures (including migrant farm labor housing structures) will continue as indicated in the 10/27/92 Harney Lane Landfill, Landfill Gas Monitoring Report. In addition to quarterly gas monitoring for all onsite and