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Global Presence ! Personal Attention HE RST & ASSOCIATES, INC ! Mr.Rick Jaime ' California Department of Corrections and Rehabilitation 7650 S.Newcastle Road/P.O.Box 213004 MAR 3 1 2010 Stockton,CA 95213-9004 ! March 30,2010 E�PERMI� HEALTHENT PERMIT/SERVICES ! Dear Mr.Jaime: Summary of Northern California Youth Correctional Center Sampling Results ! February 2010 On February 3, 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 BC Laboratories,Inc. ! Well #4 (reported to be the primary water supply well for the facility) yielded tetrachloroethene and trichloroethene concentrations well below the federal Maximum Contaminant Limits(MCLS)of 5 µg/1. ! The February 2010 tetrachloroethene concentration at Well#4 was reported at 2.2 µg/1 compared to an MCL of 5 µg/1. The trichloroethene concentration at Well#4 was reported at 0.56 µg/1 compared to an MCL of 5 µg/1 during this event. ! Well #1 (now reported to be a supplemental water supply well that operates about 20% of the year during peak demand periods) exhibited a tetrachloroethene concentration above the MCL. The ! February 2010 tetrachloroethene concentration at Well #1 was reported at 7.5 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at Well#1 during this event at a concentration of 1.3 µg/1 compared to an MCL of 5 µg/1. ! Well#2 (now reported to be utilized only during short term emergencies, should they occur) exhibited a tetrachloroethene concentration above the MCL. The February 2010 tetrachloroethene concentration at Well#2 was reported at 7.8 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at 1.8 ! µg/1 compared to an MCL of 5 µg/1. In February 2010,tetrachloroethene was detected at a concentration of 1.4µg/1 compared to an MCL of ! 5 µg/l,and trichloroethene was detected at an estimated concentration of 0.24 µg/1 at the indoor faucet sample location. ! Quality assurance samples collected during the February 2010 sampling event included a field blank at Well#4,a field blank at the indoor faucet,a trip blank,and duplicate samples at Well#4 and the indoor faucet. The field blank sample at Well #4 was collected to provide an indication of VOCs present in ! the ambient outdoor air or the laboratory analytical process. The field blank sample at the indoor faucet location was collected to provide an indication of VOCs present in the ambient indoor air or the laboratory analytical process. The trip blank sample was collected to provide an indication of any ! 4630 South Highway 94—North Outer Road Telephone(636)939-9111 St.Charles,Missouri 63304 Fax(636)939-9757 !