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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 FES r UG$ <br /> ' Stockton,CA 95213-9004 <br /> ENv?4?0N11,11ENT HEALTH <br /> February 13,2008 PERMI I/tSERVICES <br /> ' Dear Mr.Jaime: <br /> Summary of Northern California Youth Center Sampling Results <br /> January 2008 <br /> On January 17, 2008, sampling was performed at the Northern California Youth Center (NCYC) to <br /> ' provide supplemental information regarding volatile organic compound(VOC)concentrations at Well <br /> #1, Well #2, Well #4, and the indoor faucet location included in other recent sampling events. <br /> Sampling was performed by Herst & Associates, Inc. VOC analyses were performed by BC <br /> Laboratories,Inc. <br /> Based on the analytical results, only one well at the NCYC exhibited a National Primary Drinking <br /> Water Standards-Maximum Contaminant Level(MCL)exceedance during the January 2008 sampling <br /> event. A summary of detected VOCs is provided in the attached table. <br /> ' Well #4 (reported to be the primary water supply well for the facility) yielded a tetrachloroethene <br /> concentration well below the MCL. The January 2008 tetrachloroethene concentration at Well#4 was <br /> reported at 1.4 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 January <br /> 2008 tetrachloroethene concentration at Well #1 was reported at 3.8 ug/1 compared to an MCL of 5 <br /> 119/1- <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 January 2008 tetrachloroethene <br /> concentration at Well#2 was reported at 5.4 ug/1 compared to an MCL of 5 ug/l. <br /> ' Quality assurance samples collected during the January 2008 sampling event included a field blank at <br /> Well#1,a field blank at the indoor faucet,a trip blank,and duplicate samples at Well#2 and the indoor <br /> faucet. The field blank sample at Well #1 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 />