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1 Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC.® <br /> 1 <br /> � <br /> 1 Mr.Rick Jaime EDODD <br /> California Department of Corrections and Rehabilitation SEP 3 0 2009 <br /> 7650 S.Newcastle Road/P.O.Box 213004 <br /> Stockton,CA 95213-9004 ENVIRONMENT HEALTH <br /> 1 September 29,2009 PERMIT/SERUICES <br /> 1 Dear Mr.Jaime: <br /> Summary of Northern California Youth Correctional Center Sampling Results <br /> 1 August 2009 <br /> On August 12, 2009, sampling was performed at the Northern California Youth Correctional Center <br /> 1 (NCYCC) to provide supplemental information regarding volatile organic compound (VOC) <br /> concentrations at Well#1,Well#2,Well#4, and the indoor faucet location(Table 1) included in other <br /> recent sampling events. Sampling was performed by Herst & Associates, Inc. VOC analyses were <br /> 1 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 federal Maximum Contaminant Limits (MCLS). The August 2009 <br /> 1 tetrachloroethene concentration at Well #4 was reported at 1.8 µg/1 compared to an MCL of 5 9g/1. <br /> Trichloroethene has not been detected at Well#4 for the past four(4)consecutive events. <br /> 1 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 August <br /> 2009 tetrachloroethene concentration at Well #1 was reported at 3.0 µg/1 compared to an MCL of 5 <br /> 1 µg/1. Trichloroethene was not detected at Well#1 this event. <br /> Well#2(now reported to be utilized only during short term emergencies, should they occur) exhibited <br /> 1 a tetrachloroethene concentration above the MCL. The August 2009 tetrachloroethene concentration at <br /> Well#2 was reported at 6.7 µg/1 compared to an MCL of 5 pg/l. Trichloroethene was detected at 1.7 <br /> µg/1 compared to an MCL of 5 µg/1. <br /> 1 In August 2009, the indoor faucet sample yielded a tetrachloroethene concentration of 1.7 µg/1 <br /> compared to an MCL of 5 µg/1, and trichloroethene was not detected at the indoor faucet for the fourth <br /> consecutive event. <br /> 1 Quality assurance samples collected during the August 2009 sampling event included a field blank at <br /> Well#4,a field blank at the indoor faucet,a trip blank,and duplicate samples at Well#4 and the indoor <br /> 1 faucet. The field blank sample at Well#4 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 /> 1 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 /> 1 <br />