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CMr. Todd Del Frate -2- F, J <br />THIRD QUARTER 2008 GROUNDWATER MONITORING REPORT, <br />CORRAL HOLLOW SANITARY LANDFILL OCT 3 0 2008 <br />ENVIRONMENT HEALTH <br />Progress of Corrective Action Measures is submitted during the first and third quKRIAITAHMES <br />therefore included in this quarterly report. Monitoring data indicates significant improvement in <br />groundwater quality at well MW -5 (the impacted well) since operation of the LFG system in late <br />2001, although this improvement has stabilized in the recent years. <br />We continue to see improvement in the inorganic parameters at MW -4 that we attribute to grading <br />improvements in late 2003. This continuing improvement seems to indicate that the lack of <br />closure cover over small portions of the refuse at the eastern edge of the landfill is not negatively <br />impacting groundwater at this time. <br />MW -8 groundwater elevation allowed us to redraw the shallow aquifer groundwater contours, <br />indicating a gradient north, west, and south from SB -1. This result is consistent with local <br />recharge between the landfill property and the freeway. <br />You have received our revised Closure and Postclosure Maintenance Plan for the Corral Hollow <br />Landfill, incorporating our proposed closure over the portions of our property where refuse is not <br />covered by the existing closure cap. This was to have been a joint document with CalTrans, but <br />CalTrans declined to participate. We intend to proceed with the closure cap within our property <br />upon approval of the Closure Plan. <br />I certify under penalty of law that I have personally examined and am familiar with the information <br />submitted in this document and all attachments and that, based on my inquiry of those individuals <br />immediately responsible for obtaining the information, I believe that the information is true, <br />accurate, and complete. I am aware that there are significant penalties for submitting false <br />information, including the possibility of fine and imprisonment. <br />If you have any questions, please contact me at (209) 468-8504. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:Ij <br />NAICorral Hollow\Groundwater Mon itori ng\Repts2008\3rdQ\CH3rdQtrO8lefter.doc <br />Enclosure <br />c: Robert McClellon, Environmental Health Department <br />LA 21125B <br />