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1 Global Presence <br /> HERST & ASSOCIATES, INC Personal Attention <br /> 1 <br /> Mr.Rick Jaime NOV, 3 0 2009 <br /> 1 California Department of Corrections and Rehabilitation ENOWNT HEALTH <br /> 7650 S.Newcastle Road/P.O.Box 213004 PERMITISERVICES <br /> Stockton,CA 95213-9004 <br /> 1 November 25,2009 <br /> 1 Dear Mr.Jaime: <br /> Summary of Northern California Youth Correctional Center Sampling Results <br /> 1 October 2009 <br /> On October 1, 2009, sampling was performed at the Northern California Youth Correctional Center <br /> 1 (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 /> 1 performed by BC Laboratories,Inc. <br /> Well #4 (reported to be the primary water supply well for the facility) yielded a tetrachloroethene <br /> 1 concentration well below the federal Maximum Contaminant Limits (MCLS). The October 2009 <br /> tetrachloroethene concentration at Well #4 was reported at 1.7 µg/1 compared to an MCL of 5 µg/1. <br /> Trichloroethene was detected at Well#4 at a concentration of 0.36(estimated value) µg/1 compared to <br /> an MCL of 5 gg/l. <br /> 1 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 below the MCL. The <br /> 1 October 2009 tetrachloroethene concentration at Well#1 was reported at 4.5 µg/1 compared to an MCL <br /> of 5 gg/l. Trichloroethene was detected at Well#1 at a concentration of 0.70 gg/1 compared to an MCL <br /> of 5 gg/l. <br /> 1 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 2009 tetrachloroethene concentration <br /> 1 at Well#2 was reported at 6.1 gg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at 1.3 <br /> gg/1 compared to an MCL of 5 µg/1. <br /> 1 In October 2009, the indoor faucet sample yielded a tetrachloroethene concentration of 1.5 µg/1, well <br /> below the MCL of 5 gg/l. Trichloroethene was detected at a concentration of 0.33 (estimated value) <br /> gg/1 compared to an MCL of 5 µg/1. <br /> 1 Quality assurance samples collected during the October 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 /> 1 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 /> 1 4630 South Highway 94—North Outer Road Telephone(636)939-9111 <br /> St.Charles,Missouri 63304 Fax(636)939-9757 <br /> 1 <br />