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Global Presence <br /> ):::,6,RST & ASSOCIATES, INC.® Personal Attention <br /> `0 1r <br /> Mr.Rick Jaime o <br /> r <br /> California Department of Corrections and Rehabilitation <br /> 7650 S.Newcastle Road/P.O.Box 213004 tHEA TH <br /> Stockton,CA 95213-9004 pp j"("jE'i�VI C ES <br /> December 23,2008 <br /> ' Dear Mr.Jaime: <br /> Summary of Northern California Youth Correctional Center Sampling Results <br /> ' November 2008 <br /> On November 13,2008,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,hic. <br /> tWell #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 November 2008 <br /> ' tetrachloroethene concentration at Well#4 was reported at 2.0 ug/l compared to an MCL of 5 ug/l. <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 tetrachloroethane concentration below the MCL. The <br /> November 2008 tetrachloroethene concentration at Well #1 was reported at 4.9 ug/1 compared to an <br /> MCL of 5 ug/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 October 2008 tetrachloroethene concentration <br /> ' at Well#2 was reported at 8.6 ug/1 compared to an MCL of 5 ug/l. <br /> The indoor faucet sample yielded a tetrachloroethene concentration of 1.8 ug/1 compared to an MCL of <br /> 5 ug/l. <br /> Quality assurance samples collected during the November 2008 sampling event included a field blank <br /> at Well #4, a field blank at the indoor faucet, a trip blank, and duplicate samples at Well #4 and the <br /> ' indoor faucet. The field blank sample at Well #4 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 /> ' 4630 South Highway 94—North Outer Road Telephone(636)939-9111 <br /> St.Charles, Missouri 63304 Fax(636)939-9757 <br />