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THOMAS R. FLINN P.0.BOX 1810-1810 E.HAZELTON AVENUE <br /> 0 `r DIRECTOR ` "t!h. STOCKTON,CALIFORNIA 95201-3018 <br /> a fi (209)468-3000 FAX(209)468-2999 <br /> www.sjgov.org/pubworks <br /> THOMAS M.GAU ` <br /> CHIEF DEPUTY DIRECTOR <br /> MICHAEL SELLING <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGERJANES <br /> BUSINESS ADMINISTRATOR <br /> July 14, 2010 <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 /> SUBJECT: SECOND SEMESTER 2009 GROUNDWATER AND SURFACE WATER <br /> MONITORING REPORT; FOOTHILL SANITARY LANDFILL <br /> Dear Mr. Del Frate: <br /> Enclosed is the First Semester 2010 Groundwater and Surface Water Monitoring Report for the <br /> Foothill Sanitary Landfill. Groundwater monitoring continues on a semi-annual basis in <br /> accordance with our WDRs. General parameters, minerals and inorganic results are <br /> unremarkable. <br /> The up-gradient Well MW-4 has been sampled nine times since installation, which is not <br /> sufficient for statistical analysis by Sanitas. The County has doubled the sampling frequency at <br /> that well to obtain sufficient data as soon as feasible, but in the meantime, statistical analysis <br /> using data from cross-gradient well MW-1 (previously considered up-gradient) provides <br /> provisional conclusions. <br /> The pump at well MW-1 was replaced with an electric pump which allows water sampling. One <br /> VOC (toluene) was reported in this well. This compound is not characteristic of this well or any <br /> other well at the site, so we do not believe this indicates of groundwater impact by landfill gas at <br /> this time. <br /> Surface water from the creek on the eastern property boundary was sampled this year. Results <br /> were similar between the upstream and downstream samples, indicating no noticeable impact <br /> by surface flow from the landfill property. <br /> Vegetation on the evapotranspirative closure cap was generally thick after the winter rains, and <br /> has been grazed as we discussed. We believe that grazing will assist the perennial grasses <br /> (with their deep roots) by removing the shade provided by the dead stalks of the annual plants. <br /> Photos are included. <br />