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' Global Presence <br /> Personal Attention <br /> HERST & ASSOCIATES, INC <br /> Mr.Rick Jaime i L,��s J VED <br /> ' California Department of Corrections and Rehabilitation <br /> 7650 S.Newcastle Road/P.O.Box 213004 AUG d 6 c u i u <br /> Stockton,CA 95213-9004 ENVIRONMENT HEALTH <br /> PERMIT/ScRVICES <br /> August 24,2010 <br /> ' Dear Mr.Jaime: <br /> ' Summary of Northern California Youth Correctional Center Sampling Results <br /> July 2010 <br /> On July 15, 2010, 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) exhibited a tetrachloroethene <br /> concentration below the Maximum Contaminant Limit (MCL). The July 2010 tetrachloroethene <br /> concentration at Well #4 was reported at 1.6 µg/1 compared to an MCL of 5 µg/1. The July 2010 <br /> ' trichloroethene concentration at Well #4 was reported at 0.38 µg/1 (estimated value) compared to an <br /> MCL of 5 µg/1. <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 above the MCL. The July <br /> 2010 tetrachloroethene concentration at Well #1 was reported at 6.8 µg/1 compared to an MCL of 5 <br /> µg/1. Trichloroethene was detected at Well#1 during this event at a concentration of 1.2µg/1 compared <br /> to an MCL of 5 µg/1. <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 July 2010 tetrachloroethene concentration at <br /> Well#2 was reported at 8.0 gg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at 1.7 <br /> µg/1 compared to an MCL of 5 gg/l. <br /> ' During the July 2010 sampling event, the indoor faucet sample location had a tetrachloroethene <br /> concentration of 1.6 gg/1 compared to an MCL of 5 gg/1, and a trichloroethene concentration of 0.21 <br /> ' gg/l(estimated value)compared to an MCL of 5 µg/1. <br /> Quality assurance samples collected during the July 2010 sampling event included a field blank at Well <br /> #2, a field blank at the indoor faucet, a trip blank, and duplicate samples at Well #4 and the indoor <br /> ' faucet. The field blank sample at Well #2 was collected to provide an indication of VOCs present in <br /> the ambient outdoor air or the laboratory analytical process. The field blank sample at the indoor faucet <br /> location was collected to provide an indication of VOCs present in the ambient indoor air or the <br /> ' 4631 North St.Peters Parkway Telephone(636)939-9111 <br /> St.Charles,Missouri 63304 Fax(636)939-9757 <br />