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' Global Presence Personal Attention HERST & ASSOCIATES, INC RECEIVED 1 Mr.Rick Jaime JAN 31 2011 California Department of Corrections and Rehabilitation 7650 S.Newcastle Road/P.O.Box 213004 ENVIRONMENTAL HEALTH ' Stockton,CA 95213-9004 PERMIT/SERVICES January 28,2011 ' Dear Mr.Jaime: ' Summary of Northern California Youth Correctional Center Sampling Results December 2010 On December 28,2010, 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. ' During the December 28, 2010 sampling event, the NCYCC was being supplied by on-site water supply wells as described in the following paragraphs. Forward Landfill has since completed a project to provide a 12 inch, looped, city waterline system to the NCYCC facility. This system began ' supplying city water on Tuesday, January 18, 2011. Well #3 and Well#2 were taken off line during fourth quarter 2010; the remaining two NCYCC wells (Well#4 and Well #1) were taken off line this past week. Well#4 (reported to be the primary water supply well for the facility prior to January 18, 2011, when the city waterline system began supplying water to the NCYCC) exhibited a tetrachloroethene concentration below the Maximum Contaminant Limit(MCL). The December 2010 tetrachloroethene ' concentration at Well#4 was reported at 2.0 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was not detected at Well #4 during this event. Well #4 was operational during the December 2010 sampling event but has been taken off line this past week and no longer supplies water to the NCYCC. ' Well#1 (reported to be a supplemental water supply well that operated about 20% of the year during peak demand periods prior to January 18, 2011,when the city waterline system began supplying water to the NCYCC) exhibited a tetrachloroethene concentration above the MCL. The December 2010 tetrachloroethene concentration at Well #1 was reported at 8.1 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at Well#1 during this event at a concentration of 1.7 µg/1 compared to an ' MCL of 5 µg/1. Well#1 was operational during the December 2010 sampling event but has been taken off line this past week and no longer supplies water to the NCYCC. Well#2(reported to be utilized only during short term emergencies prior to January 18,2011,when the ' city waterline system began supplying water to the NCYCC) exhibited a tetrachloroethene concentration above the MCL. The December 2010 tetrachloroethene concentration at Well #2 was ' 4631 North St. Peters Parkway Telephone(636)939-9111 St.Charles, Missouri 63304 Fax(636)939-9757