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Global Presence <br /> HERST & ASSOCIATES, INC.® Personal Attention <br /> 1 ��jo <br /> Mr.Rick Jaime ,jUN `3 209 <br /> ' California Department of Corrections and Rehabilitation �� yEA11kt <br /> 7650 S.Newcastle Road/P.O.Box 213004 <br /> Stockton,CA 95213-9004 PE���,�+SERV�cES <br /> June 29 2009 <br /> Dear Mr.Jaime: <br /> Mesults Summary of Northern California Youth Correctional Center Samp <br /> tMay 2009 <br /> On May 27, 2009, sampling was performed at the Northern California Youth Correctional Center <br /> ' (NCYCC) to provide supplemental information regarding volatile organic compound (VOC) <br /> concentrations at Well#1,Well#2,Well#4,and the indoor faucet location(Table 1) included in other <br /> recent sampling events. Sampling was performed by Herst & Associates, Inc. VOC analyses were <br /> ' performed by BC Laboratories,Inc. <br /> Well #4 (reported to be the primary water supply well for the facility) yielded a tetrachloroethene <br /> ' concentration well below the federal Maximum Contaminant Limits (MCLS). The May 2009 <br /> tetrachloroethene concentration at Well #4 was reported at 1.4 µg/1 compared to an MCL of 5 µg/1. <br /> Trichloroethene was not detected at Well#4 in May 2009. <br /> tWell #1 (now reported to be a supplemental water supply well that operates about 20% of the year <br /> during peak demand periods) exhibited a tetrachloroethene concentration below the MCL. The May <br /> 2009 tetrachloroethene concentration at Well #1 was reported at 4.4 µg/1 compared to an MCL of 5 <br /> µg/1. Trichloroethene was detected at 0.71 µg/1 compared to an MCL of 5 µg/l. <br /> Well#2 (now reported to be utilized only during short term emergencies, should they occur) exhibited <br /> ' a tetrachloroethene concentration above the MCL. The May 2009 tetrachloroethene concentration at <br /> Well #2 was reported at 5.8 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at 1.3 <br /> µg/1 compared to an MCL of 5 µg/1. <br /> In May 2009,the indoor faucet sample yielded a tetrachloroethene concentration of 1.4 µg/1 compared <br /> to an MCL of 5 µg/1,and trichloroethene was not detected at the indoor faucet. <br /> ' Quality assurance samples collected during the May 2009 sampling event included a field blank at <br /> Well#2,a field blank at the indoor faucet,a trip blank,and duplicate samples at Well#1 and the indoor <br /> ' faucet. The field blank sample at Well #2 was collected to provide an indication of VOCs present in <br /> the ambient outdoor air or the laboratory analytical process. The field blank sample at the indoor faucet <br /> location was collected to provide an indication of VOCs present in the ambient indoor air or the <br /> laboratory analytical process. The trip blank sample was collected to provide an indication of any <br /> ' 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 /> ' 4630 South Highway 94—North Outer Road Telephone(636)939-9111 <br /> St.Charles,Missouri 63304 Fax(636)939-9757 <br /> 1 <br />