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a to P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> THOMAS R. FLINN STOCKTON,CALIFORNIA 95201 <br /> DIRECTOR (209)468-3000 FAX(209)468-2999 <br /> www.co.san-joaquin.ca.us <br /> THOMAS M.GAU <br /> DEPUTY DIRECTOR <br /> JAMES F PAYTON Wcddn fccY <br /> OU <br /> BUSINESS ADMINISTRATOR <br /> MANUEL SOLORIO <br /> INTERIM DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> May 7,2002 <br /> tt <br /> w <br /> Ms.Kim Schwab <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento,California 95827 <br /> SUBJECT: HARNEY LANE SANITARY LANDFILL GROUNDWATER AND SURFACE <br /> WATER MONITORING <br /> Dear Ms. Schwab: <br /> Enclosed is a copy of the First Quarter 2002 Monitoring Report for the Harney Lane Sanitary Landfill. <br /> Results from the first quarter monitoring event show trace detections of three VOCs. However,two of <br /> these constituents were found in the field,trip,and lab blanks,and we conclude that these detections were <br /> due to laboratory error. The third constituent(Xylenes)was detected in trace concentrations at MW-2. <br /> The County did not resample for these constituents. <br /> Hexavalent chromium was detected at trace concentrations in MW-3 and MW-4. The concentrations of <br /> hexavalent chromium were very low(4 parts per billion),and therefore,the chromium is assumed to be <br /> from natural sources. <br /> Surface water samples were taken during the first quarter monitoring event. Statistical analysis of the <br /> data from those samples suggest that the concentration limit for Chloride was exceeded at downstream <br /> sampling point S-2. However,the concentration of Chloride at S-2 was the same as S-1,which is the <br /> upstream sampling location. Therefore,this technical"exceedence"is an artifact of the statistical analysis <br /> method,and does not indicate degradation of surface water by the landfill. <br /> This report was prepared to comply with current Waste Discharge Requirements Order No. 96-139. <br /> If you have any questions,please call me at(209)468-3066. <br /> Sincerely, <br /> W. MICHAEL CARROLL,PE <br /> Senior Civil Engineer <br /> MC:mr <br /> N:\1Hamey Lane\Groundwater Monitoring\2002\1 stQ021etter.wpd <br /> Enclosure <br /> c: Cobert McClellon Environmental Health Division <br /> LA 11870 <br />