▁site ▁in ▁L ans ing ▁Char ter ▁Township ▁near ▁L ans ing , ▁Michigan . ▁▁ ▁Prior ▁to ▁ 1 9 6 4 , ▁a ▁dry ▁clean ing ▁business ▁was ▁located ▁at ▁the ▁site , ▁and ▁stored ▁dry ▁clean ing ▁fluid ▁there ▁in ▁an ▁under ground ▁storage ▁tank , ▁which ▁was ▁removed ▁in ▁the ▁ 1 9 5 0 s . ▁Elect ro pl ating ▁operations ▁involving ▁the ▁use ▁of ▁chrome ▁and ▁various ▁met als ▁began ▁in ▁ 1 9 6 4 , ▁following ▁a ▁change ▁in ▁ownership . ▁Prior ▁to ▁ 1 9 8 0 , ▁these ▁operations ▁cont amin ated ▁the ▁soil ▁and ▁ground water ▁at ▁the ▁site , ▁most ▁not ably ▁with ▁chrom ium , ▁along ▁with ▁co pper , ▁nick el , ▁and ▁z inc ▁( in ▁both ▁soil ▁and ▁ground water ) ▁and ▁ar sen ic ▁( in ▁the ▁soil ▁alone ). ▁In ▁July ▁ 1 9 8 0 , ▁green - color ed ▁chrom ium - t aint ed ▁water ▁was ▁found ▁to ▁be ▁le aking ▁into ▁the ▁bas ement ▁of ▁a ▁residence ▁near ▁the ▁site . ▁ ▁Following ▁investig ations ▁at ▁the ▁site ▁from ▁ 1 9 8 0 ▁to ▁ 1 9 9 3 , ▁an ▁initial ▁clean up ▁was ▁completed ▁in ▁ 1 9 9 4 . ▁The ▁clean up ▁began ▁upon ▁completion ▁of ▁a ▁rem ed ial ▁investigation ▁report ▁in ▁March ▁ 1 9 9 3 ▁and ▁was ▁substantial ly ▁complete ▁by ▁September ▁ 1 9 9 4 , ▁an ▁exped ited ▁time