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1.2.3 Run-off/Run-on facilities <br /> The Corral Hollow Sanitary Landfill utilizes several methods to control run-off and run- <br /> on to the facility. A perimeter road/berm around the waste management unit prevents <br /> any run-on to the unit. Run-off is directed into two retention ponds via a mid-slop berm <br /> and perimeter ditches. <br /> 2. HYPOTHETICAL RELEASE SCENARIO <br /> The Corral Hollow Sanitary Landfill is unlined and stopped receiving waste in 1991 and <br /> was closed in 1995. Ongoing groundwater monitoring shows some VOC impacts from <br /> LFG migration and moderately elevated inorganics in some groundwater monitoring <br /> wells. A landfill gas extraction system was installed in 2001. The most likely release <br /> that will require corrective action is an elevation of VOCs in groundwater rather than an <br /> elevation of inorganics. <br /> The hypothetical release scenario for the Corral Hollow Sanitary Landfill is as follows: <br /> 1. Release occurs from the unlined landfill <br /> 2. Deep landfill gas (carrying VOCs) beyond the influence of the existing landfill <br /> gas extraction wells escapes from the bottom of the landfill. <br /> 3. The escaped landfill gas travels to groundwater resulting in low level (<50 µg/1) <br /> VOC concentration in groundwater. <br /> 3. HYPOTHETICAL CORRECTIVE ACTION <br /> A corrective action response was developed to mitigate the impacts envisioned under the <br /> hypothetical release scenario. The extent and complexity of the corrective action <br /> response is proportional to the environment threat of the release and is consistent with the <br /> type and magnitude of corrective action mandated by the Regional Water Quality Board <br /> at the time this document was prepared. <br /> The corrective action envisioned is based on the following assumptions and premises: <br /> 1. The focus of the corrective action is source control. <br /> 2. The low level release of VOCs to groundwater will not require active <br /> groundwater cleanup (pump and treat, air sparging, etc.). This approach is <br /> justifiable given the remoteness of the landfill and absence of surrounding <br /> residences. <br /> 73467 3 August 9,2006 <br /> LA 21125 Corrective Action Financial Assurance Cost Estimate <br /> Corral Hollow Sanitary Landfill <br />