Laserfiche WebLink
Global Presence <br /> Personal Attention <br /> ERST & ASSOCIATES, INC.0 <br /> Mr.Rick Jaime <br /> California Department of Corrections and Rehabilitation <br /> 7650 S.Newcastle Road/P.O. Box 213004 <br /> Stockton,CA 95213-9004 <br /> ENVIR,'J <br /> October 8,2008 RV I' <br /> Dear Mr.Jaime: <br /> Summary of Northern California Youth Correctional Center Sampling Results <br /> September 2008 <br /> On September 9, 2008, 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 a tetrachloroethene <br /> concentration well below the federal Maximum Contaminant Limit (MCL). The September 2008 <br /> tetrachloroethene concentration at Well#4 was reported at 1.8 ug/l compared to an MCL of 5 ug/L. <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 /> September 2008 tetrachloroethene concentration at Well #1 was reported at 2.0 ug/l compared to an <br /> MCL of 5 ug/l. <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 September 2008 tetrachloroethene <br /> concentration at Well#2 was reported at 7.3 ug/l compared to an MCL of 5 ug/l. <br /> The indoor faucet sample yielded a tetrachloroethene concentration of 1.8 ug/l. <br /> Quality assurance samples collected during the September 2008 sampling event included a field blank <br /> at Well #1, a field blank at the indoor faucet, a trip blank, and duplicate samples at Well #4 and the <br /> indoor faucet. The field blank sample at Well #2 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 /> The September 2008 field blank samples yielded no detectable concentrations of VOCs. Two VOCs <br /> (brornoform at 2.5 ug/l and dibromochloromethane at 1.1 ug/1) were detected in the trip blank sample <br /> associated with the sampling event. Bromofonn was detected in similar concentrations to the trip blank <br /> 4630 South Highway 94—North Outer Road Telephone(636)939-9111 <br /> St.Charles, Missouri 63304 Fax(636)939-9757 <br />