▁in ▁D aven port , ▁as ▁the ▁levels ▁of ▁Ch rom ium ▁VI ▁measured ▁eight ▁times ▁the ▁air ▁district ' s ▁acceptable ▁level ▁at ▁Pacific ▁Element ary ▁School ▁and ▁ 1 0 ▁times ▁at ▁the ▁D aven port ▁Fire ▁Department . ▁Both ▁are ▁located ▁less ▁than ▁a ▁half - mile ▁from ▁CE ME X . ▁Ch rom ium ▁VI ▁may ▁have ▁been ▁unw itting ly ▁produced ▁at ▁the ▁CE ME X ▁plant ▁in ▁D aven port ▁for ▁the ▁last ▁seven ▁years . ▁According ▁to ▁Ed ▁K end ig , ▁the ▁executive ▁director ▁of ▁the ▁Mon ter ey ▁Bay ▁Un ified ▁Air ▁Pol l ution ▁Control ▁District , ▁it ' s ▁" high ly ▁possible " ▁that ▁Ch rom ium ▁VI ▁continues ▁to ▁be ▁produced ▁across ▁the ▁country ▁as ▁an ▁accident al , ▁previously ▁unknown ▁by product ▁of ▁the ▁c ement - making ▁process . ▁ ▁In ▁ 2 0 0 7 , ▁the ▁E PA ▁file d ▁a ▁compla int ▁against ▁CE ME X ▁for ▁viol ating ▁federal ▁air ▁reg ulations ▁at ▁its ▁Victor ville ▁plant , ▁and ▁in ▁ 2 0 0 6 , ▁CE ME X ▁was ▁c ited ▁for ▁viol ations ▁at ▁plants ▁in ▁Santa ▁Barbara ▁and ▁Michigan . ▁ ▁Environment al ists ▁and ▁scient ists ▁are ▁concerned ▁for ▁the ▁Mon ter ey ▁Bay ▁coast line ▁where ▁C em ex ▁has ▁a ▁sand ▁min ing ▁operation ▁in ▁the ▁city ▁of ▁Marina , ▁California . ▁The ▁California ▁Coast al ▁Commission ▁in ▁March ▁ 2 0 1 6 ▁issued ▁a ▁Ce ase