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' Summary of Northern California Youth Correctional Center Sampling Results for December 28,2010 <br /> Forward Landfill-Austin Road Unit,California Page 2 <br /> reported at 7.0µg/1 compared to an MCL of 5 gg/1. Trichloroethene was detected at 1.4µg/1 compared <br /> ' to an MCL of 5 µg/1. Well#2 had been taken off line during fourth quarter 2010. <br /> During the December 2010 sampling event, the indoor faucet sample location had a tetrachloroethene <br /> ' concentration of 1.7 gg/l compared to an MCL of 5 µg/1, and trichloroethene was not detected at the <br /> indoor faucet during this event. During the December 2010 sampling event, the indoor faucet was <br /> supplied by NCYCC water supply wells and not by the city waterline system. <br /> Quality assurance samples collected during the December 2010 sampling event included a field blank <br /> at Well #1, a field blank at the indoor faucet, a trip blank, and duplicate samples at Well #1 and the <br /> indoor faucet. The field blank sample at Well #1 was collected to provide an indication of VOCs <br /> present in the ambient outdoor air or the laboratory analytical process. The field blank sample at the <br /> indoor faucet location was collected to provide an indication of VOCs present in the ambient indoor air <br /> ' or the laboratory analytical process. The trip blank sample was collected to provide an indication of <br /> any VOCs associated with shipment or the laboratory analytical process. The duplicate samples were <br /> collected to provide an indication of sampling and laboratory testing reproducibility. <br /> ' The December 2010 field blanks at Well #1 and the indoor faucet yielded no detections. No VOCs <br /> were detected in the trip blank. Duplicate sample results for the December 2010 sampling event were <br /> similar to the original sample results,indicating good reproducibility. <br /> Sincerely, <br /> Herst&Associates,Inc. <br /> ' Erin Fanning Ward Herst,PG,HG <br /> Staff Biologist Managing Partner <br /> California PG#7150 <br /> California HG#775 <br /> Cc: Howard Hold—RWQCB <br /> Robert McClellon—San Joaquin County LEA <br /> Reuben Ramirez—Forward,Inc. <br /> Don Litchfield—Forward,Inc. <br /> ' Attachments: Table 1 —VOC Detection Tables per Location <br /> Laboratory Analytical Results <br /> 1 <br />