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12 <br /> 10 <br /> 8 i --- <br /> I I I I I I I I I I I <br /> I <br /> I I I I I I I I I <br /> I I I I I I I I I <br /> J I I I I I I I <br /> =L I I I I I I I <br /> C I I I I I I I I <br /> 0 <br /> 6 - ---I — -4----- —————-4------4------4------I------I--- — <br /> I I I I I I <br /> i I I I I I I <br /> O I I I I I <br /> v I I I I I I I I <br /> C I I I I I I I I <br /> O I I I I I I I <br /> U I I I I I I I l <br /> I I I I I I I l <br /> 4 I I I I I I <br /> I I I I I <br /> I I I I I <br /> I I I I I <br /> I I I I I <br /> I I I I I I I I <br /> I I I I I I I I I <br /> I I I I I I I I I I <br /> 2 -----I-- - -4----- <br /> I <br /> I I I I I I I <br /> I I I I I I I I I I <br /> I I I I I I I I <br /> I I O I I I I I I <br /> I I I I I I I I I <br /> - - - - - - - - - - - - - - - - - - -I - - - - - -I— - - — - - - - - - - -- - - - - •- - - - - - - - - -- - - - - - <br /> I I I I I I I I O O <br /> 0 I I I I I I <br /> 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 <br /> Date <br /> Notes: <br /> Where a primary and duplicate sample were collected,the higher of the primary and duplicate <br /> result is displayed. Carbon Tetrachloride Concentration Trends <br /> Open symbols represent non-detected results. Middle Zone Wells <br /> Non-detect results that were reported to the method detection limit(between November 2005 O MW-10 MW-12 O MW14 <br /> and March 2014;between May 2020 and March 2025)are presented at the method detection - February 2005-March 2025 <br /> limit;non-detect results that were reported to the laboratory reporting limit(between February 26700 South Banta Road <br /> and August 2005;between September 2014 and March 2019)are presented at the reporting Tracy California <br /> limit. <br /> pg/L:microgram per liter — — — — MCL(0.5 µg/L) D <br /> MCL: maximum contaminant level Gevsyntec Figure <br /> Cnnsultants <br /> WR3313A May 2025 13 <br /> in racy rgect2 25-03_ iennial ig 2-14- -1 istoric _imesenes.xsx <br />