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r, Draft Environmental Impact Report Page IV.F-26 Forward Inc. Landfill Expansion beneficial impact of offsetting the groundwater extraction. These older models may be being updated as part of the response to the RWQCB requirement for a source control study. FTwo offsite private wells 8106A and 7898, approximately 4,000 feet north of the landfill border, have been documented to have been impacted since at least 1999, and Forward has supplied private water to the owners since that time. , A proposal that includes two additional groundwater extraction wells in to be installed is currently under review by the RWQCB. Such wells would impact the volume of groundwater being extracted and treated. The larger size of the Groundwater Treatment System would impact, depending on the selection of the final remedy, the amount of filter media used to complete the cleanup operations and may require new permits thought the Air Resources Board F, (CARB) when the air stripper is used. 1•, The RWQCB's concerns about the placement of the groundwater extracted from the existing groundwater extraction wells into a new recharge basin north of the Austin Road Landfill border was articulated previously by the RWQCB. Board Order 2008-00712 has requirements 7 for a number of 2009 reports designed to further evaluate groundwater degradation impacts form the landfill operations—both current and future. These include: • A Source Control Report, due February 15,2009, currently being reviewed by the RWQCB; • Sampling Report due April 30,2009; F • Demonstration that the corrective action system is continuously opening by May 15, 2009; l , • A Technical Report demonstrating that the modified Corrective Action System is achieving the performance standard of preventing further migration of the VOC plume northward. FThe RWQCB is concerned that the artificial recharge scheme proposed without any groundwater extraction wells to the north would behead the leachate plume, allowing the northeastern part of the plume to travel further offsite with only natural attenuation as the F proposed remedy of that portion of the plume. However, the RWQCB agreed to allow the recharge basin to be installed and determine if additional extraction wells north are needed after further examination of the groundwater quality monitoring results from the monitoring F wells north of the landfill. The impact of the plume on the NCYCC supply wells demonstrates the need for additional wells. If the decrease predicted by the AEE model for each monitoring well do not occur then a contingency plan to install more extraction wells north should be implemented. • The RWQCB has stipulated a "non-detected" designation as the cleanup goal for the VOCs rather than the drinking water maximum concentration levels. • Progress towards cleanup should be re-assessed as stipulated in the RWQCB Order 2009-0712. The following measures are proposed as part of the project: • Forward landfill has agreed to a short term and long term mitigation of the supply wells at the NCYCC wells as described in the Herst (2008b) contingency plan report prepared F for the NCYCC. The short-term (in.next six months) solution is the use of activated carbon treatments units to clean the groundwater pumped from the supply well being used for all operation purposes, including drinking water, at the NCYCC facility. F