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THOMAS R. FLINN <br />DIRECTOR <br />• <br />06, <br />THOMAS <br />THOMAS M. GAU <br />DEPUTY DIRECTOR <br />MANUELSOLORIO worung O y <br />au <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGERJANES <br />BUSINESS ADMINISTRATOR July 31, 2006 <br />Mr. Todd Del Frate <br />California Regional Water Quality Control Board <br />Central Valley Region <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, California 95670-6114 <br />P. O. BOX 1810 -1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgov.org <br />SUBJECT: FIRST SEMESTER 2006 GROUNDWATER AND SURFACE WATER MONITORING <br />REPORT; FOOTHILL SANITARY LANDFILL <br />Dear Mr. Del Frate: <br />Enclosed is the First Semester 2006 Monitoring Report for the Foothill Sanitary Landfill. <br />Groundwater monitoring continues on a semi-annual basis in accordance with our WDRs. A single trace <br />7 VOC (chloromethane) was detected at MW -1, and another single trace (chloroethane) was detected at MW - <br />3. In neither case had these compounds been detected prior to this sampling event except as laboratory <br />contaminants. We believe that such sporadic and inconsistent findings reflect the extreme sensitivity of the <br />analytical instruments used and the difficulty in making any laboratory environment contaminant -free. <br />With the exception of these sporadic "detections" and false positive reports due to laboratory <br />contamination, no VOCs have been found at Foothill Sanitary Landfill since October 2002. <br />Surface water was sampled this semester. Acetone and 2-Butanone were detected in both the upstream and <br />downstream samples; therefore, impact by the landfill is not indicated. <br />Soil gas VOC monitoring continues on a semi-annual basis, in accordance with the WDRs. <br />If you have any questions, please call me at (209) 468-8504. <br />Sincerely, <br />.117 <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:kb <br />N:\1FoothiQ\Groundwater Monitoring\Repts2006\lstSemO6\lstSemO6letter.doc <br />Enclosure <br />Robert McClellon, Environmental Health Department <br />LA 31610 <br />