File Permit Number MO-G500000 Effective Date Mon, 05/23/2022 - 12:00 Expiration Date Sat, 05/22/2027 - 12:00 Description SIC #1442 and 1446 Process wastewater, mine/pit dewatering, and/or stormwater discharges associated with sand and gravel mining/dredging, processing, and stockpiles.