, ▁cal if or ni um - 2 5 2 , ▁the ▁heav iest ▁is ot ope ▁produced ▁at ▁SR P , ▁was ▁separated ▁as ▁a ▁by product ▁of ▁the ▁cur ium ▁program . ▁Begin ning ▁in ▁ 1 9 6 9 , ▁cal if or ni um - 2 5 2 ▁was ▁made ▁in ▁a ▁separate ▁production ▁program . ▁ ▁Pal om ares ▁Following ▁the ▁ 1 9 6 6 ▁Pal om ares ▁B - 5 2 ▁crash , ▁the ▁Sav ann ah ▁River ▁Site ▁received ▁cont amin ated ▁soil ▁from ▁the ▁environmental ▁clean ▁up ▁and ▁rem ed iation . ▁So il ▁with ▁radiation ▁cont am ination ▁levels ▁above ▁ 1 . 2 ▁MB q / m 2 ▁was ▁placed ▁in ▁ 2 5 0 - lit re ▁( 6 6 ▁U . S . ▁gall on ) ▁drums ▁and ▁sh ipped ▁to ▁the ▁Sav ann ah ▁River ▁Plant ▁for ▁bur ial . ▁A ▁total ▁of ▁ 2 . 2 ▁hect ares ▁( 5 . 4 ▁acres ) ▁was ▁de cont amin ated ▁by ▁this ▁technique , ▁producing ▁ 6 , 0 0 0 ▁bar rel s . ▁ 1 7 ▁hect ares ▁( 4 2 ▁acres ) ▁of ▁land ▁with ▁lower ▁levels ▁of ▁cont am ination ▁was ▁mixed ▁to ▁a ▁depth ▁of ▁ 3 0 ▁cent im eters ▁( 1 2   in ) ▁by ▁h arrow ing ▁and ▁p low ing . ▁On ▁rock y ▁s lop es ▁with ▁cont am ination ▁above ▁ 1 2 0 ▁kB q /