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PquIN - 91 P.O.BOX 1810-1810 E.HAZELTON AVENUE THOMAS R. FLINN STOCKTON,CALIFORNIA 95201-3018 i• DIRECTOR y�t�" o V (209)468-3000 FAX(209)468-2999 p a www.co.san-joaquin.ca.us C4CiFUR� THOMAS M.GAU DEPUTY DIRECTOR MANUEL SOLORIO Worldng for YOU u U E C E U E 0 DEPUTY DIRECTOR STEVEN WINKLER B F L 200 0 � DEPUTY DIRECTOR FEB D LU '# BENTON ANGOVE January 30, 2004 ENVIRUNIV1ENi htALTH BUSINESS ADMINISTRATOR PERMIT/SERVICES Ms. Kim Schwab California Regional Water Quality Control Board Central Valley Region 11020 Sun Center Drive, #200 Rancho Cordova, California 95820-6114 SUBJECT: CORRAL HOLLOW SANITARY LANDFILL GROUNDWATER AND SURFACE WATER MONITORING,FOURTH QUARTER AND ANNUAL 2003 Dear Ms. Schwab: �Iyw� We are pleased to report that,with one exception, Corral Hollow Landfill met the Water Quality Protection Standards as established by the Waste Discharge Requirements, Order No. 5-01-176. Enclosed is a copy of the Fourth Quarter and Annual 2003 Monitoring Report for the Corral Hollow Sanitary Landfill, submitted in compliance with the current`VDRs. The exception was at well MW-6, which should have been retested for acetone(see below),but was not, due to new staff at the County. We acknowledge that, even though the site is in corrective action,we should retest VOC found above the PQL, and regret that this well was not retested. The next test is scheduled for the first week of February 2003. We will forward the results of that test as soon as available,prior to the quarterly report. Concentration limits were not exceeded this quarter where these limits could be established. With the exception of the exceedence of Electrical Conductivity in well SB-1,there were no exceedences reported. The number of VOCs reported at MW-5 (the impacted well) continues to decline. The decreasing trend in pH, and increasing trend in Nitrate at down-gradient well MW-4,was again indicated this quarter. Interestingly,MW-4 does not show an increasing trend in chloride, which is a common constituent in leachate, and moves more quickly through the soil than nitrate. Increasing trends in several other leachate constituents are also not seen. On the other hand,MW-5 does show an increasing trend for chloride,but not for nitrate. The chloride trend seems to have begun in 1995 when the landfill was closed,which is contrary to expectation. One possible explanation is that refuse extends under the drainage ditch on the northeast edge of the landfill,which may have occurred in spite of the investigation by the County in preparation of the Closure Plan. We will be investigating methods to determine the edge of refuse,possibly with non-intrusive geophysical methods.