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Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC: <br /> Mr.Rick Jaime IE C F� V IE'_' <br /> ' California Department of Corrections and Rehabilitation 5 E P 3 0 Z010 <br /> 7650 S.Newcastle Road/P.O.Box 213004 ENVIRONMENT HEALTH <br /> tStockton,CA 95213-9004 PERMIT/SERVICES <br /> September 29,2010 <br /> Dear Mr.Jaime: <br /> ' Summary of Northern California Youth Correctional Center Sampling Results <br /> August 2010 <br /> ' On August 16, 2010, sampling was performed at the Northern California Youth Correctional Center <br /> (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 /> performed by TestAmerica,Inc. <br /> Well #4 (reported to be the primary water supply well for the facility) exhibited a tetrachloroethene <br /> concentration below the Maximum Contaminant Limit (MCL). The August 2010 tetrachloroethene <br /> concentration at Well#4 was reported at 1.7 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was <br /> not detected at Well#4 during the August 2010 event. <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 above the MCL. The August <br /> ' 2010 tetrachloroethene concentration at Well #1 was reported at 5.4 µg/1 compared to an MCL of 5 <br /> µg/1. Trichloroethene was detected at Well #1 during this event at a concentration of 0.85 µg/1 <br /> (estimated value)compared to an MCL of 5 µg/1. <br /> ' Well #2 (now reported to be utilized only during short term emergencies, should they occur) exhibited <br /> a tetrachloroethene concentration above the MCL. The August 2010 tetrachloroethene concentration at <br /> t Well#2 was reported at 7.7 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at 1.7 <br /> µg/1 compared to an MCL of 5 µg/1. <br /> ' During the August 2010 sampling event, the indoor faucet sample location had a tetrachloroethene <br /> concentration of 1.5 µg/1 compared to an MCL of 5 µg/1, and trichloroethene was not detected during <br /> this event. <br /> ' Quality assurance samples collected during the August 2010 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 /> 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 /> laboratory analytical process. The trip blank sample was collected to provide an indication of any <br /> t4631 North St.Peters Parkway Telephone(636)939-9111 <br /> St.Charles, Missouri 63304 Fax(636)939-9757 <br />