COMPLIANCE INFO_2008-2010 - Laserfiche WebLink

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June -19-2008 07:53 AM CA I egrated Waste Management 916-%413884 2/3 w Mr. Andrew .Keller June 17, 2p0$ Page 2 of 3 RWQCB grad/or the C.IW10) the landfill to be capped with nataral sediment layer and covered with a vegetated layer of topsoil, rather than an impervious layer. The presentation goes on to state that the coves was designed to contain from up to a 100 -year, 24-hour storm. The presentation prompts us to ask the following questions: 1) Has the RWQCB approved such a cover design? 2) If the RWQCB has approved the stated covet design, were there calculations included for the cover design? If there were calculations to support the design., please submit tlae calculations. Corrective Action Plan: On Page 2, Site History: 'llie statement is made that, "...the CIWMB directed Cove Contractors to address these issues in a Corrective Action Playa, including the recommendation for the installation of new perimeter gas probes outside the landfill footprint: and an increased monitoring -Eiequency." The statement is mostly correct but not entirely. CIWMB staff' did not recommend installing new perimeter gas probes. - What we stated was that, if upon review of the as-builts it is determined that the two probes (PGP1 and PG- P2) were found to have been installed is waste, Cove Contactors will be approved to install two other replacement probes outside the landfill footprint. As we indicate in this letter, our review of the as-built.S fbr the two probes do not indicate that the probes are located in refuse. The contention that the probes axe installed in refuse has not been proven. Our conclusion is that PUP 1 and PGP2 appear to be good compliance probes and they have indicated gas migrating from the site. 'On. Page 13, .Implementation of.Preftrred Alternative: The statement is made that the preferred corrective action, alternative is the installation of a passive system with carbon filter treatment. Because the gas migration monitoring probes have uidicated that gas is migrating from the site, Cove Contractoirs is hereby directed to submit to th.e Enforcement Agency for review and approval the following: a The design plan for the preferred passive system_ The system shall be designed in such a way that it could be converted to an active system, if monitoring results should indicate the need, and shall also be easy to expand to all other areas of the landfill. • Within thirty (30) days, submit proposed time lines for the installation of the system. ,(Mote: the design and installation of the control system may require approval by the San Joaquin. Air Pollution Control District.