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Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC.0 <br /> 1ED <br /> Mr.Rick Jaime <br /> California Department of Corrections and Rehabilitation <br /> 7650 S.Newcastle Road/P.O.Box 213004 7 2008 <br /> Stockton,CA 95213-9004HCr,,!'q <br /> E N V R� ' ]H <br /> January 14,2008 <br /> P DRIP T S CE R V 1 C3 EE S <br /> Dear Mr.Jaime: <br /> Summary of Northern California Youth Center Sampling Results <br /> November 2007 <br /> On November 19, 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 November 2007 sampling event. A summary of <br /> detected VOCs is provided in the attached table. <br /> Pursuant to Directive #3 within Citation No. 03-10-07C-004 issued by the Department of Health <br /> Services Stockton Office,repairs to Well#1 at the NCYC have been completed.During the November <br /> 2007 sampling event, NCYC personnel activated the pump within Well #1 and the well was <br /> subsequently sampled for VOCs in a similar fashion to Well #2 and Well #4. While on-site, NCYC <br /> personnel informed Herst & Associates, Inc. personnel that Well #1 has replaced Well #2 as the <br /> system's lag supply well to Well#4. <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 /> November 2007 tetrachloroethene concentration at Well #1 was reported at 3.2 ug/l 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 November 2007 tetrachloroethene concentration at Well #4 <br /> was reported at 1.3 ug/l. <br /> Quality assurance samples collected during the November 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 #2 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 /> 4630 South Highway 94—North Outer Road Telephone(636)939-9111 <br /> St.Charles,Missouri 63304 Fax(636)939-9757 <br />