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' Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC.® <br /> 1 <br /> ' Mr.Rick Jaime <br /> California Department of Corrections and Rehabilitation <br /> 7650 S.Newcastle Road/P.O.Box 213004 <br /> Stockton,CA 95213-9004 <br /> FEB 2 7 2009 <br /> February 25,2009 ENVIF;«r'v,� Ej;j IE_nt <br /> Dear Mr.Jaime: -SERVICES <br /> Summary of Northern California Youth Correctional Center Sampling Results <br /> January 2009 <br /> On January 20, 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 Limit (MCL). The January 2009 <br /> tetrachloroethene concentration at Well #4 was reported at 1.7 µg/1 compared to an MCL of 5 µg/1. <br /> Trichloroethene has been non-detect in Well#4 for two consecutive events. <br /> ' Well #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 above to the MCL. The <br /> January 2009 tetrachloroethane concentration at Well#1 was reported at 5.6µg/1 compared to an MCL <br /> of 5 µg/1. <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 January 2009 tetrachloroethene concentration <br /> at Well#2 was reported at 6.9µg/1 compared to an MCL of 5 µg/1. <br /> The indoor faucet sample yielded a tetrachloroethene concentration of 1.3 µg/1 compared to an MCL of <br /> 5 µg/1. Trichloroethene in the indoor faucet has been non-detect for two consecutive events. <br /> Quality assurance samples collected during the January 2009 sampling event included a field blank at <br /> Well#4,a field blank at the indoor faucet,a trip blank,and duplicate samples at Well#4 and the indoor <br /> faucet. The field blank sample at Well #4 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 />