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Pagel of 2 00 Natalia Subbotnikova [EH] From: Natalia Subbotnikova [EH] Sent: Friday, July 13, 2012 1:53 PM To: Michael Carroll Cc: Robert McClellon [EH]; 'Joyesh Chandra' Subject: Corral Hollow Landfill -GW-6 Importance: High Good afternoon Michael, Just a friendly reminder that Corral Hollow Landfill still under violation for T 27 CCR 20921 —Gas Monitoring and Control: Section 20921. CIWMB-Gas Monitoring and Control. (a)To provide for the protection of public health and safety and the environment,the operator shall ensure that landfill gas generated at a disposal site is controlled in such a manner as to satisfy the following requirements: (1)The concentration of methane gas must not exceed 1.25 percent by volume in air within any portion of any on-site structures. (2)The concentration of methane gas migrating from the disposal site must not exceed 5 percent by volume in air at the disposal site permitted facility boundary or an alternative boundary approved in accordance with Section 20925. (3)Trace gases shall be controlled to prevent adverse acute and chronic exposure to toxic and/or carcinogenic compounds. Concentrations of gas probe measured the following for methaneW June 12, 2012: GW 6—Shallow—0.0 Intermediate—0.8 Deep—6.9 July 13, 2012: GW 6—Shallow—0.0 Intermediate— 1.1 Deep—6.1 Please,take adequate measures to decrease gas level at the property boundary. Section 20937.CIWMB-Reporting and Control of Excessive Gas Concentrations. (a)When the results of landfill gas monitoring indicate concentrations of methane or trace gases in excess of the compliance requirements specified in Section 20921(a),the operator shall: (1) Immediately take all steps necessary to protect public health and safety and the environment and notify the EA by telephone or electronic means. (2)Within seven (7)days of detection of excessive landfill gas concentrations. (A)Verify validity of results by reviewing the following: 7/13/2012