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OurN <br /> � � a <br /> THOMAS M.GAU P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> DIRECTOR STOCKTON,CALIFORNIA 96201 <br /> P. (209)468-3000 FAX(209)468-2999 <br /> wme.sjgov.org!pub%%,orks <br /> FRITZ BUCHMAN <br /> DEPUTY DIRECTOR W or YOU <br /> for <br /> MICHAEL SELLING ii YOU <br /> DEPLTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGERJANES <br /> BUSINESS ADAUNISTRATOR <br /> January 16, 2013 <br /> Mr. Todd Del Frate <br /> California Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670-6114 <br /> SUBJECT: FOURTH QUARTER 2012 GROUNDWATER MONITORING REPORT, <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> Dear Mr. Del Frate: <br /> Enclosed, please find the Fourth Quarter 2012 Groundwater and Surface Water <br /> Monitoring Report for the Corral Hollow Sanitary Landfill. Monitoring was performed in <br /> accordance with the monitoring program included with the Waste Discharge <br /> Requirements (WDRs) approved by the Regional Water Quality Control Board for this <br /> site. <br /> The results of this quarter's monitoring are consistent with previous quarters. Deep <br /> aquifer wells MW-6 and MW-7 and shallow aquifer wells SB-1 or MW-4 remain without <br /> impact. Shaw reports that no general water quality parameters were exceeded this <br /> quarter with the exception of Bicarbonate Alkalinity in SB-1 and MW-4. Because there is <br /> no primary or secondary maximum contaminant limit (MCLs) for this parameter, this does <br /> not represent a potential human health risk. VOC concentrations at other wells remain <br /> consistent with that of previous quarters. The highest concentration of a VOC was below <br /> 10 ppb at well MW-5 (our most impacted well). <br /> This report includes the third periodic data from the three newly-installed wells. Data <br /> from these wells show VOC concentrations below 2 ppb, with most reported as "trace". <br /> These data confirm the extent of groundwater impact, delineated in the Evaluation <br /> Monitoring Plan Report of August 2012. <br /> We continue to see improvement in the inorganic parameters at MW-4 that we attribute to <br /> grading improvements in late 2003. This continuing improvement seems to indicate that <br /> the lack of closure cover over small portions of the refuse at the eastern edge of the <br /> landfill is not negatively impacting groundwater at this time. <br />