After a tip came in from San Joaquin County that big-box retailer Costco was improperly storing, handling, and disposing of hazardous wastes, 29 California District Attorneys banded together to find out more. Here in the East Bay, inspectors rifled through landfill-bound detritus from five Alameda County Costco stores. Elsewhere in the state, another three trash inspections took place. The searches confirmed the DA’s suspicions: Costco was illegally dumping a variety of hazardous waste materials including pharmaceuticals, in-house cleaning products, and tire repair cement.
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