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�qu ra i <br /> { t P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> ' THOMAS M.GAU <br /> DIRECTOR STOCKTON,CALIFORNIA 95201 <br /> (209)468-3000 FAX(209)468-2999 <br /> www.sjgov.orglpubworks <br /> RITZ <br /> DEPUTY DIRECT <br /> DEOR Worldng for YOU RECEIVED <br /> MICHAEL SELLING <br /> DEPUTY DIRECTOR q <br /> STEVEN WINKLER 2012 <br /> DEPUTY DIRECTOR <br /> ROGERJANES <br /> BUSINESS ADMINISTRATOR PERMIT/SERVICES <br /> April 04, 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: FIRST QUARTER 2012 GROUNDWATER MONITORING REPORT, <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> Dear Mr. Del Frate: <br /> Enclosed please find the First Quarter 2012 Groundwater and Surface Water Monitoring <br /> Report for the Corral Hollow Sanitary Landfill. Monitoring was performed in accordance with <br /> the monitoring program included with the Waste Discharge Requirements (WDRs) approved <br /> by the Regional Water Quality Control Board for this site. <br /> The results of this quarter's monitoring are consistent with previous quarters. Deep aquifer <br /> wells MW-6 and MW-7 remain without impact. No general water quality parameters were <br /> exceeded this quarter with the exception of Bicarbonate Alkalinity in SB-1, MW-4, and MW-5. <br /> 1 Because there is no primary or secondary maximum contaminant limit (MCLs) for this <br /> parameter, this information is of interest but, does not represent a potential human health <br /> risk. <br /> ' No VOCs were reported at shallow aquifer wells SB-1 or MW-4, or at any deep aquifer well. <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 the <br /> lack of closure cover over small portions of the refuse at the eastern edge of the landfill is not <br /> negatively impacting groundwater at this time. <br /> TO-14 analyses of soil gas will be included, along with concentrations of major gasses (02, <br /> CO2, CH4, and N2), in the next quarterly report per your request. <br /> Progress of Corrective Action Measures is submitted during the first and third quarters, and is <br /> therefore included in this quarterly report. <br />