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' Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC.' <br /> 1 <br /> Mr.Rick Jaime <br /> ' California Department of Corrections and Rehabilitation <br /> 7650 S.Newcastle Road/P.O.Box 213004 R 3 2008 <br /> ' Stockton,CA 95213-9004 ENVIRONMENT <br /> April 1,2008 <br /> pER!N,ITI, VICESTH <br /> ' Dear Mr.Jaime: <br /> Summary of Northern California Youth Center Sampling Results <br /> ' March 2008 <br /> On March 13, 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 /> Well #4 (reported to be the primary water supply well for the facility) yielded a tetrachloroethene <br /> ' concentration well below the MCL. The March 2008 tetrachloroethene concentration at Well #4 was <br /> reported at 1.5 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 March <br /> 2008 tetrachloroethene concentration at Well #1 was reported at 4.2 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 March 2008 tetrachloroethene <br /> tconcentration at Well#2 was reported at 5.7 ug/l compared to an MCL of 5 ug/l. <br /> The indoor faucet sample yielded a tetrachloroethene concentration of 1.4 ug/1. <br /> ' Quality assurance samples collected during the March 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 March 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 March 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 />