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' Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC <br /> JE <br /> ' Mr.Rick Jaime <br /> California Department of Corrections and Rehabilitation 1 7 2008 <br /> 7650 S.Newcastle Road/P.O.Box 213004 <br /> Stockton,CA 95213-9004 <br /> January 14,2008 <br /> Dear Mr.Jaime: <br /> Summary of Northern California Youth Center Sampling Results <br /> December 2007 <br /> On December 13, 2007, 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,there were no National Primary Drinking Water Standards-Maximum <br /> ' Contaminant Level (MCL) exceedances during the December 2007 sampling event. A summary of <br /> detected VOCs is provided in the attached table. <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 <br /> December 2007 tetrachloroethene concentration at Well #1 was reported at 3.8 ug/1 compared to an <br /> MCL of 5 ug/l. <br /> ' Well #4 (reported to be the primary water supply well for the facility) yielded a tetrachloroethene <br /> concentration well below the MCL. The December 2007 tetrachloroethene concentration at Well #4 <br /> ' was reported at 1.5 ug/1. <br /> Quality assurance samples collected during the December 2007 sampling event included a field blank <br /> ' at Well #2, 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 #2 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 /> The December 2007 field blank samples yielded no detectable concentrations of VOCs. All VOCs <br /> were reported as non-detect in the trip blank sample. Duplicate sample results for the December 2007 <br /> ' sampling event were similar to the original sample results,indicating good reproducibility. Bromoform <br /> is commonly associated with chlorinated water. Based on previous site evaluations, the facility <br /> ' 4630 South Highway 94—North Outer Road Telephone(636)939-9111 <br /> St.Charles,Missouri 63304 Fax(636)939-9757 <br /> 1 <br />