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Page 2 of 3 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 methane%: 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: (i) probe readings; (ii)possible liquid interference; (iii)control well influence; and (iv) barometric pressure effects. (B) Place in the operating record a description of and submit a letter to the EA that describes: (i)the levels of methane and trace gas detected; (ii)a brief description of the nature and extent of the problem based on information currently available; (iii)the steps the operator has taken to protect public health and safety and the environment; and (iv)a brief description of any further corrective actions that the operator or others need to take to adequately protect public health and safety and the environment prior to the implementation of the remediation plan described in subdivision (a)(3) below. (3)Within 60 days of detection, implement a remediation plan approved by the EA and CIWMB for the methane gas releases, place a copy of the plan in the operating record, forward a copy of the plan to the EA and CIWMB, and notify the EA that the plan has been implemented. The plan shall describe the nature and extent of the problem and the proposed remedy. (4) Construct a gas control system that meets the criteria of Section 20939, designed by a registered civil or mechanical engineer,within a period of time specified by the EA. Installation of the system shall be in accordance with a design and in a manner approved for construction by the EA in coordination, if applicable,with the RWQCB. (b)The EA,with concurrence by the CIWMB, may establish an alternative schedule for demonstrating compliance with 7/16/2012