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' Global Presence Personal Attention HERST & ASSOCIATES, INC RECEIVED ' Mr.Rick Jaime MAR 31 2011 California Department of Corrections and Rehabilitation 7650 S.Newcastle Road/P.O.Box 213004 ENVIRONMENTAL HEALTH ' Stockton,CA 95213-9004 PERMIT/SERVICES March 29,2011 ' Dear Mr.Jaime: ' Summary of Northern California Youth Correctional Center Sampling Results February 2011 ' On February 17, 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. Well#3 was previously used only to meet short term requirements. Wells#1, #2, #3, and#4 no longer supply water to the NCYCC. In preparation to decommission Well #1 and Well #2, these wells had been removed from service physically and electrically prior to the February 2011 sampling event (information provided by the NCYCC). Therefore, samples were not able to be obtained at Well#1 and Well #2 during the February 2011 sampling event. 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 February 17,2011 sampling event,the NCYCC was ' being supplied solely by the new city waterline system. Well#4 will be retained for future use as a non-potable source for irrigation (information provided by the NCYCC). Tetrachloroethene and trichloroethene were not detected at Well#4. In preparation to decommission Well #1, this well had been removed from service physically and electrically prior to the February 2011 sampling event (information provided by the NCYCC). Therefore,a sample was not able to be obtained at Well#1 during the February 2011 sampling event. ' hi preparation to decommission Well #2, this well had been removed from service physically and electrically prior to the February 2011 sampling event (information provided by the NCYCC). Therefore,a sample was not able to be obtained at Well#2 during the February 2011 sampling event. ' Two common municipal water supply disinfectant bi-products, chloroform and bromodichloromethane, were detected at the indoor faucet sample location during the February 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 trihalomethanes at the indoor faucet in February 2011 is in compliance with the drinking water 4631 North St.Peters Parkway Telephone(636)939-9111 St.Charles, Missouri 63304 Fax(636)939-9757 1