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' Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC. <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 /> 7 <br /> June 10,2008 <br /> Dear Mr.Jaime: <br /> Summary of Northern California Youth Center Sampling Results <br /> ' May 2008 <br /> On May 7,2008,sampling was performed at the Northern California Youth Center(NCYC)to provide <br /> ' supplemental information regarding volatile organic compound(VOC)concentrations at Well#1,Well <br /> #2, Well #4, and the indoor faucet location included in other recent sampling events. Sampling was <br /> performed by Herst&Associates,Inc. VOC analyses were 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 MCL. The May 2008 tetrachloroethene concentration at Well #4 was <br /> reported at 1.6 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 below the MCL. The May <br /> ' 2008 tetrachloroethene concentration at Well #1 was reported at 3.8 ug/1 compared to an MCL of 5 <br /> ug/1. <br /> Well#2(now reported to be utilized only during short term emergencies, should they occur)exhibited <br /> a tetrachloroethene concentration slightly above the MCL. The May 2008 tetrachloroethene <br /> concentration at Well#2 was reported at 5.6 ug/1 compared to an MCL of 5 ug/l. <br /> ' The indoor faucet sample yielded a tetrachloroethene concentration of 1.6 ug/1. <br /> ' Quality assurance samples collected during the May 2008 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#4 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 /> The May 2008 field blank samples yielded no detectable concentrations of VOCs. All VOCs were <br /> ' reported as non-detect in the trip blank sample. Duplicate sample results for the May 2008 sampling <br /> event were similar to the original sample results,indicating good reproducibility. <br /> 4630 South Highway 94—North Outer Road Telephone(636)939-9111 <br /> St.Charles, Missouri 63304 Fax(636)939-9757 <br />