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' Global Presence <br /> HERST & ASSOCIATES, INC Personal Attention <br /> ' Mr.Rick Jaime JAN 2 8 2009 <br /> California Department of Corrections and Rehabilitation ENVI R O N M E N T HEALTH <br /> 7650 S.Newcastle Road/P.O.Box 213004 PERMIT <br /> ' Stockton,CA 95213-9004 <br /> January 26,2009 <br /> ' Dear Mr.Jaime: <br /> ' Summary of Northern California Youth Correctional Center Sampling Results <br /> December 2008 <br /> On December 9, 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,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 December 2008 <br /> tetrachloroethene concentration at Well#4 was reported at 1.7 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 tetrachloroethene concentration equal to the MCL. The <br /> December 2008 tetrachloroethene concentration at Well #1 was reported at 5.0 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 December 2008 tetrachloroethene <br /> ' concentration at Well#2 was reported at 6.6 ug/1 compared to an MCL of 5 ug/1. <br /> The indoor faucet sample yielded a tetrachloroethene concentration of 1.3 ug/1 compared to an MCL of <br /> 5 ug/l. <br /> Quality assurance samples collected during the December 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 #2 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 />