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PgU�ry <br /> 2: '•Z <br /> THOMAS R. FLINN P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> DIRECTOR STOCKTON,CALIFORNIA 95201-3018 <br /> (209)468-3000 FAX(209)468-2999 <br /> Cq F ORN`P www.co.san-joaquin.ca.us <br /> THOMAS M.GAU <br /> 4r <br /> DEPUTY DIRECTOR .LN <br /> MANUEL SOLORIO Workkg far YOU <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> BENTON ANGOVE <br /> BUSINESS ADMINISTRATOR <br /> July 29, 2004 <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 95670 <br /> SUBJECT: FIRST SEMESTER 2004; FOOTHILL SANITARY LANDFILL <br /> GROUNDWATER AND SURFACE WATER MONITORING REPORT <br /> Dear Ms. Schwab: <br /> Enclosed is the First Semester 2004 Monitoring Report for the Foothill Sanitary Landfill. We <br /> are pleased to report again that VOCs are not detected at any groundwater monitoring well at this <br /> site. You may remember that the Monitoring and Reporting Program requires semi-annual <br /> monitoring of groundwater, but that we were monitoring quarterly as part of evaluation <br /> monitoring. Now that we are again"non-detect" for VOCs, we will resume semi-annual <br /> groundwater monitoring, as we discussed. <br /> The concentration of Chloride, Nitrate, and Sulfate exceeded the concentration limits at various <br /> wells, but the largest exceedence occurred at the upgradient well. We believe this reflects <br /> natural changes of groundwater quality, unrelated to the presence of the landfill. <br /> Soil gas monitoring continues to show the presence of VOCs in the vadose zone. We will <br /> continue to sample quarterly, send you the data when available, and include all data in the semi- <br /> annual reports. Because the combustible gas levels at SG-11 (then the western-most soil gas <br /> well) exceeded 5 percent in May, we installed another soil gas well (SG 12) near the western <br /> property boundary on June 3, 2004. Combustible gas concentration was found to be"non- <br /> detect"with our GEM 500 combustible gas meter at that well, showing that combustible gas is <br /> not migrating into adjacent properties. Samples were taken from this well for TO-14 analysis <br /> this month(July), and we will transmit the results to you as soon as available. <br />