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� s <br /> THOMAS R. FUNK P.O.BOX 1810.1810 E.HAZELTON AVENUE <br /> ` STOCKTON,CALIFORNIA 95201-3018 <br /> DIRECTOR �> (209)468-3000 FAX(209)468-2999 <br /> �4C/FpRN`P• wwW.co.san-joaquin.ca.us <br /> Y _ <br /> THOMAS M.GAU e/1 <br /> DEPUTY DIRECTOR werking for YOU <br /> MANUEL SOLORIO <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> .BENTON ANGOVE January 30, 2004 <br /> BUSINESS ADMINISTRATOR <br /> Ms. Kim Schwab <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive,#200 <br /> Rancho Cordova, California 95820-6114 <br /> SUBJECT: CORRAL HOLLOW SANITARY LANDFILL GROUNDWATER AND SURFACE <br /> WATER MONITORING,FOURTH QUARTER AND ANNUAL 2003 <br /> Dear Ms. Schwab: �/ jVV-1 <br /> We are pleased to report that,with one exception, Corral Hollow Landfill met the Water Quality <br /> Protection Standards as established by the Waste Discharge Requirements, Order No. 5-01-176. <br /> Enclosed is a copy of the Fourth Quarter and Annual 2003 Monitoring Report for the <br /> Corral Hollow Sanitary Landfill, submitted in compliance with the current WDRs. <br /> The exception was at well MW-6,which should have been retested for acetone (see below),but <br /> was not, due to new staff at the County. We acknowledge that, even though the site is in <br /> corrective action,'we should retest VOC found above the PQL, and regret that this well was not <br /> retested. The next test is scheduled for the first week of February 2003. We will forward the <br /> results of that test as soon as available,prior to the quarterly report. <br /> Concentration limits were not exceeded this quarter where these limits could,be established. <br /> With the exception of the exceedence of Electrical Conductivity in well SB-1,there were no <br /> exceedences reported. The number of VOCs reported at MW-5 (the impacted well)continues to <br /> decline. <br /> The decreasing trend in pH, and increasing trend in Nitrate at down-gradient well MW-4,was <br /> again indicated this quarter. Interestingly,MW-4 does not show an increasing trend in chloride, <br /> which is a common constituent in leachate, and moves more quickly through the soil than nitrate. <br /> Increasing trends in several other leachate constituents are also not seen. <br /> On the other hand, MW-5 does show an increasing trend for chloride,but not for nitrate. The <br /> chloride trend seems to have begun in 1995 when the landfill was closed,which is contrary to <br /> expectation. One possible explanation is that refuse extends under the drainage ditch on the <br /> northeast edge of the landfill,which may have occurred in spite of the investigation by the <br /> County in preparation of the Closure Plan. We will be investigating methods to determine the <br /> edge of refuse,possibly with non-intrusive geophysical methods. <br />