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Future Activities Chromium-6 Analysis <br /> • UC review of Cr-6 carcinogenicity when • DHS'initial sampling: Cr-6 is much more <br /> ingested than 7%of total Cr(often 50-100%) <br /> • PHG for Cr-6 • Cr-6 is"unregulated"chemical requiring <br /> • Results of study required by SB 2127(San monitoring,effective Jan 2001 <br /> Fernando Basin) (Summary data are posted on the DHS <br /> • Proposed MCL for Cr-6 website) <br /> -Makes sense to regulate Cr.6,if it is the <br /> constituent of concern <br /> Total Chromium Detections Sampling Update, 4/2/01: <br /> (1984-2000) Cr-6 detections <br /> • Of 11,310 sources sampled for total • range from NO to 54.2 pg/L <br /> chromium from 1984-2000,detections were • reported in 20/28 counties <br /> reported for 1,138 sources,or about 105% • reported in 90/93 systems <br /> —1,067 ground water sources <br /> -71 surface water sources • reported in 376 or 578 sources(or 65 <br /> percent) <br /> Sampling Update 4/2/01: More Information about <br /> Cr-6, no. of sources, %of detects Chromium-6 <br /> • <1 pg/L 7 ( 1.90/0) <br /> 1-10 pg/L 285 (75.8%) • Drinking Water Program,DHS <br /> • 11-20 pg/L 55 (14.60/•) http://www dhs ca eov/os/ddwem/ <br /> • 21-30 pg/L 20 ( 5.4%) <br /> 3140 pg/L 7 ( 1.9%) • OEHRAhttp://www.oehha.ca.gov <br /> • 41-50 pg/L 1 ( 0.3%) <br /> >51 pg/L 1 ( 0.3%) <br /> 3 <br />