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COUNTY JOAQUIN THOMAS R.FLINN <br /> { DEPUTY DIRECTOR <br /> DEPARTMENT OF PUBLIC WORKS <br /> P.O.BOX 1810-1810 E.HAZELTON AVENUE STEVEN WINKLER <br /> STOCKTON,CALIFORNIA 95201-1810 DEPUTY DIRECTOR <br /> �d�i F agt;•P 209/468-3000 <br /> FAX:209/468-2999 <br /> MANUEL LOPEZ <br /> DIRECTOR <br /> C__. <br /> INN <br /> June 22, 2000 <br /> Wendy Arano -- <br /> California Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827 <br /> SUBJECT: HARNEY LANE SANITARY LANDFILL MONITORING RESULTS <br /> Dear Ms. Arano: <br /> We received your letter dated May 25, 2000, regarding monitoring results at the Harney Lane <br /> Sanitary Landfill. The issues discussed in the letter are addressed below. <br /> Issue: Hexavalent Chromium was detected at trace concentrations in all wells <br /> during the fourth quarter of 1999. It was requested that Hexavalent <br /> Chromium be re-tested to demonstrate its presence in the groundwater. <br /> Response: The trace amounts reported were identical to trace amounts detected in <br /> wells at the North County and Foothill Sanitary Landfills. It is unlikely <br /> that Hexavalent Chromium exists at three different sites at identical <br /> concentrations. Additionally, this parameter was detected in the upgradient <br /> well at the Harney Lane Sanitary Landfill. Therefore, even if the detections <br /> are correct, we believe that this parameter is naturally occurring and <br /> widespread. If it is naturally occurring, it should not be considered a <br /> release from the landfill. <br /> Issue: Areas of subsidence exist on the top deck of the landfill with potential to <br /> pond water in winter months. The County had previously reported a time <br /> frame for repair that is now expired. A status report for this issue has been <br /> requested. <br /> Response: The County has begun the process of repair for the areas of subsidence. <br /> The process will consist of mowing the vegetation, identifying critical <br /> areas, filling areas to grade with borrow soil, and compacting to prevent <br /> erosion. It is expected that the top deck will be adequately repaired by <br /> August 31, 2000. Therefore, the site will be ready for winter. <br />