Laserfiche WebLink
' Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC <br /> Mr.Rick Jaime ma-swlto <br /> ' California Department of Corrections and Rehabilitation <br /> 7650 S.Newcastle Road/P.O.Box 213004 <br /> ' <br /> Stockton,CA 95213-9004 ENVIRUIv(vit=Nl-HEALTH <br /> January 27,2010 PERMIT/SERVICiES <br /> Dear Mr.Jaime: <br /> Summary of Northern California Youth Correctional Center Sampling Results <br /> ' December 2009 <br /> On December 17,2009, sampling was performed at the Northern California Youth Correctional Center <br /> (NCYCC) to provide supplemental information regarding volatile organic compound (VOC) <br /> concentrations at Well#1,Well#2,Well#4, and the indoor faucet location(Table 1)included in other <br /> recent sampling events. Sampling was performed by Herst & Associates, Inc. VOC analyses were <br /> ' performed by BC Laboratories,Inc. <br /> Well #4 (reported to be the primary water supply well for the facility) yielded tetrachloroethene and <br /> trichloroethene concentrations well below the federal Maximum Contaminant Limits(MCLS)of 5 µg/1. <br /> ' Tetrachloroethene and trichloroethene were not detected at Well#4 during the December 2009 event. <br /> Well #1 (now reported to be a supplemental water supply well that operates about 20% of the year <br /> during peak demand periods) exhibited a tetrachloroethene concentration below the MCL. The <br /> December 2009 tetrachloroethene concentration at Well #1 was reported at 1.8 µg/1 compared to an <br /> MCL of 5 µg/1. Trichloroethene was not detected at Well#1 during this event. <br /> ' Well#2 (now reported to be utilized only during short term emergencies, should they occur) exhibited <br /> a tetrachloroethene concentration above the MCL. The December 2009 tetrachloroethene <br /> concentration at Well#2 was reported at 7.3 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was <br /> detected at 1.5 µg/1 compared to an MCL of 5 µg/1. <br /> In December 2009,tetrachloroethene and trichloroethene were not detected at the indoor faucet sample <br /> location for the second consecutive event. <br /> Quality assurance samples collected during the December 2009 sampling event included a field blank <br /> t at Well #1, a field blank at the indoor faucet, a trip blank, and duplicate samples at Well #2 and the <br /> indoor faucet. The field blank sample at Well #1 was collected to provide an indication of VOCs <br /> present in the ambient outdoor air or the laboratory analytical process. 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 samples were <br /> collected to provide an indication of sampling and laboratory testing reproducibility. <br /> 4630 South Highway 94—North Outer Road Telephone(636)939-9111 <br /> St.Charles, Missouri 63304 Fax(636)939-9757 <br />