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I The build-out of Phases V and VI may result in additional leachate generation. Changed conditions in 1999 compared to 1994 show the potential need for a more extensive groundwater extraction system. Implementation of the current RWQCB Order and the complete implementation of recommendations in the April 1999 CAP shall be continued. The new data to be collected should address the potential impacts to the local supply wells. The siting of the new extraction wells should be modified as appropriate to minimize impact to supply wells. Activated carbon vessels should be changed as necessary to serve increased groundwater extraction levels. The landfill operator should continue to test all known water supply wells within the area of the mapped and projected groundwater plume. Where detectable VOC's are reported, bottled water should be supplied, as is currently being done for two affected households. The extraction wells developed as part of the CAP shall be maintained and monitored during Phases V and VI, to be employed as needed for the extraction of any residual contamination by leachate. A review of the liner and leachate collection system for the vertical expansion over the existing landfill shall be conducted by the appropriate responsible agencies upon the completion of the final design drawings. The mitigation measures contained in the EIR and Conditions of Approval for UP-99-17 mitigate the water quality impacts to a less than significant level. Air Quality The San Joaquin Valley Air Basin is non-attainment for ozone and 10-micron diameter or less particulate matter (PM-10). As of 1999, the attainment status of these two pollutants is unchanged. Emissions reductions in non-attain ment areas must be implemented until standards are met. A new cycle of air quality planning has been completed subsequent to the FEIR certification. The currently approved air quality plan, identified as the "Ozone Attainment Demonstration Plan" and the "PM-10 Attainment Demonstration Plan," includes attainment strategies for PM-10 as well as for ozone. A new Federal standard for ultra-fine diameter particulates of 2.5 microns in diameter or smaller was promulgated in 1997 (called PM-2.5). Implementation of this standard is on hold pending the outcome of legal challenges. Baseline date acquisition for PM-2.5 is continuing, but any planning activities relative to this new standard will be several years away, if they occur at all. Since the 1994 FEIR was certified, a requirement for landfill gas emissions control for landfills exceeding certain size thresholds was promulgated under Federal law. The project, with the system developed in conjunction with landfill expansion, meets or exceeds Federal requirements. As part of the PM-10 attainment strategy, the San Joaquin Valley Air Pollution Control District(SJVAPCD) developed and updated/revised Regulation Vill (Fugitive Dust Prohibitions). Regulation VII covers a wide variety of dust-generation activities from general soil disturbance to specific operations such as landfilling. The FEIR acknowledges Rule 8040 as specifically applicable to landfills. With compliance with SJVAPCD rules and regulations regarding fugitive dust control and LFG collection/disposal, landfill operations impact will be less than significant. Potentially significant impacts from fugitive dust during landfilling and from odors associated with landfill gas i were identified in the FEIR. Adverse but less-than-significant impacts were identified from on-site equipment exhaust, increased landfill gas (LFG) generation, toxic air contaminants within LFG, and vehicular travel were identified. Installation of an LFG collection system and operational procedures were specified for LFG emissions/odor impact mitigation. Project generated criteria air pollutant emissions were shown in Table Ill. G.2 of the FEIR and stated as having an adverse but less than significant air quality impact. Since FEIR certification,the SJVAPCD has published new recommended significance criteria. The estimated daily emissions relative to the thresholds San Joaquin County GP-99-7, ZR-99-6, UP-99-17, ER-99-21City of Stockton f Community Development Page 17 /