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OPaU'N C <br /> " I " THOMAS M.GAU P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> DIRECTOR STOCKTON,CALIFORNIA 95201 <br /> - (209)468-3000 FAX(209)468-2999 <br /> ' �Fgi--- 11 N%7L <br /> www.sjgov.org/pubworks <br /> FRITZ BUCHMAN <br /> DEPUTY DIRECTOR WcTking feTYOU <br /> MICHAEL SELLING <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGERJANES <br /> BUSINESS ADMINISTRATOR <br /> July 30, 2012 <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: SECOND QUARTER 2012 GROUNDWATER MONITORING REPORT, <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> Dear Mr. Del Frate: <br /> Enclosed, please find the Second 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. <br /> This report includes the first periodic data from the three newly-installed wells. Data from <br /> these wells show VOC concentrations below 1 ppb, with most reported as "trace". <br /> The highest concentration of a VOC at well MW-5 (our most impacted well) is reduced <br /> from approximately 7 in previous quarters to 5.1 ppm. I suspect this is a normal variation <br /> at these low concentrations, but hope this indicates a gradual reduction in impact. I will <br /> be interested to see the next quarter's data. <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 />