ARCHIVED REPORTS_2010_8 - Laserfiche WebLink

Home Browse Search

' Global Presence Personal Attention HERST & ASSOCIATES, INC E ' Mr.Rick Jaime D California Department of Corrections and Rehabilitation FEB 2 S 2010 Stockton,CA 95213-9004 50 S.Newcastle P.0.Box 213004 E FF�oN�'EN T NFALTH ' ?IT/SERVICES February 24,2010 ' Dear Mr.Jaime: Summary of Northern California Youth Correctional Center Sampling Results ' January 2010 On January 20, 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 January 2010 tetrachloroethene concentration at Well #4 was reported at 1.7 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at an estimated concentration of 0.41 µg/1 at Well #4 ' 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 January ' 2010 tetrachloroethene concentration at Well #1 was reported at 5.7 µg/1 compared to an MCL of 5 µg/1. Trichloroethene was detected at Well#1 during this event at a concentration of 1.0µg/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 January 2010 tetrachloroethene concentration ' at Well#2 was reported at 6.2 µg/1 compared to an MCL of 5 µg/l. Trichloroethene was detected at 1.4 µg/1 compared to an MCL of 5 µg/1. ' In January 2010,tetrachloroethene was detected at a concentration of 1.3 µg/1 compared to an MCL of 5 µg/1,and trichloroethene was detected at an estimated concentration of 0.17 µg/1 at the indoor faucet sample location. Quality assurance samples collected during the January 2010 sampling event included a field blank at Well#1,a field blank at the indoor faucet,a trip blank,and duplicate samples at Well#1 and the indoor faucet. The field blank sample at Well #1 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