25 Pa. Code § 236.537 - Nonacknowledgment
A generator or broker who has not received acknowledgment of receipt of the waste shipment from the next broker or the regional facility operator within 15 days of delivery shall immediately investigate why the shipment has not been received by the person so designated on the manifest. If the generator or broker is unable to locate the shipment, he shall prepare a report on the investigation conducted and shall file the report with the Department within 2 weeks after completion of the investigation.
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