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t Global Presence HERST & ASSOCIATES, INC Personal Attention RECEIVED ' Mr.Rick Jaime APR 2 9 2011 California Department of Corrections and Rehabilitation 7650 S.Newcastle Road/P.O.Box 213004 ENVIRONMENTAL HEALTH Stockton,CA 95213-9004 PERMIT/SERVICES ' April 28,2011 ' Dear Mr.Jaime: ' Summary of Northern California Youth Correctional Center Sampling Results March 2011 t On March 31, 2011, sampling was performed at the Northern California Youth Correctional Center (NCYCC) to provide supplemental information regarding volatile organic compound (VOC) concentrations at Well#1,Well#2,Well#4,and the indoor faucet location(Table 1) included in other recent sampling events. Sampling was performed by Herst & Associates, Inc. VOC analyses were performed by TestAmerica,Inc. ' Forward, Inc. has completed a project to provide a 12 inch, looped, city waterline system to the NCYCC facility. The new city waterline system began supplying city water to the NCYCC on Tuesday, January 18, 2011. Therefore, during the March 31, 2011 sampling event, the NCYCC was being supplied solely by the new city waterline system. In preparation to decommission Well#1,Well ' #2, and Well#4,these wells have been removed from service prior to the March 2011 sampling event (information provided by the NCYCC). Therefore, samples were not able to be obtained at Well #1, Well#2,and Well#4 during the March 2011 sampling event. ' Two common municipal water supply disinfectant bi-products, chloroform and bromodichloromethane, were detected at the indoor faucet sample location during the March 2011 ' sampling event. Chloroform and bromodichloromethane are trihalomethanes. Trihalomethanes are commonly produced as part of the chlorination process utilized by municipal water supplies. The drinking water standard for trihalomethanes is 80 parts per billion (µg/1). The concentration of t trihalomethanes at the indoor faucet in March 2011 is in compliance with the drinking water standard. During the March 2011 sampling event, the indoor faucet was supplied by the city waterline system and not by NCYCC water supply wells. ' Quality assurance samples collected during the March 2011 sampling event included a field blank at the indoor faucet, a trip blank, and a duplicate sample at the indoor faucet. The field blank sample at the indoor faucet location was collected to provide an indication of VOCs present in the ambient indoor t air or the laboratory analytical process. The trip blank sample was collected to provide an indication of any VOCs associated with shipment or the laboratory analytical process. The duplicate sample was collected to provide an indication of sampling and laboratory testing reproducibility. 4631 North St.Peters Parkway Telephone(636)939-9111 St.Charles, Missouri 63304 Fax(636)939-9757