You are the engineer for farmer Anderson who is planning on a residential housing development in his former apple orchard in Massachusetts . Soil samples analyzed for arsenic show following results :

sample concentration in soil
sample 1 ..................... 52.7 mg/kg
sample 2 ..................... 11.3 mg /kg
sample 3 ....................... 4.9 mg /kg

what do you advice your client based on this information ...
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