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! Global Presence <br /> HERST & ASSOCIATES, INC.® <br /> PTIEC ED <br /> ! <br /> MAY 31 <br /> .2011 <br /> ! Mr.Rick Jaime ENVIRONMENTAL HETM <br /> California Department of Corrections and Rehabilitation PERMIT/SERVIC <br /> 7650 S.Newcastle Road/P.O.Box 213004 <br /> ! Stockton,CA 95213-9004 <br /> May 27,2011 <br /> ! Dear Mr.Jaime: <br /> ! Summary of Northern California Youth Correctional Center Sampling Results <br /> April 2011 <br /> ! On April 21, 2011, sampling was performed at the Northern California Youth Correctional Center <br /> (NCYCC) to provide supplemental information regarding volatile organic compound (VOC) <br /> concentrations at the indoor faucet location (Table 1) included in other recent sampling events. <br /> ! Sampling was performed by Herst&Associates, hlc. VOC analyses were performed by TestAmerica, <br /> Inc. <br /> ' Forward, Inc. has completed a project to provide a 12 inch, looped, city waterline system to the <br /> NCYCC facility. The new city waterline system began supplying city water to the NCYCC on <br /> Tuesday, January 18, 2011. Therefore, during the April 21, 2011 sampling event, the NCYCC was <br /> ! being supplied solely by the new city waterline system. <br /> Three common municipal water supply disinfectant bi-products (bromodichloromethane, <br /> ! chlorodibromomethane,and chloroform)were detected at the indoor faucet sample location during the <br /> April 2011 sampling event. Bromodichloromethane, chlorodibromomethane, and chloroform are <br /> trihalomethanes. Trihalomethanes are commonly produced as part of the chlorination process utilized <br /> by municipal water supplies. The drinking water standard for trihalomethanes is 80 parts per billion <br /> ! (µg/1). The concentration of trihalomethanes at the indoor faucet in April 2011 (84.6µg/1)exceeded the <br /> drinking water standard. <br /> ! Quality assurance samples collected during the April 2011 sampling event included a field blank at the <br /> indoor faucet, a trip blank, and a duplicate sample at the indoor faucet. 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 sample was <br /> collected to provide an indication of sampling and laboratory testing reproducibility. <br /> ' The April 2011 field blank at the indoor faucet yielded one detection: acetone (4.9 µg/L, estimated <br /> value). No VOCs were detected in the trip blank. Duplicate sample results for the April 2011 sampling <br /> ! event were similar to the original sample results,indicating good reproducibility. <br /> ! <br /> 4631 North St.Peters Parkway Telephone(636)939-9111 <br /> St.Charles,Missouri 63304 Fax(636)939-9757 <br />