PURPOSE: This rule describes the steps for reporting leaks and spills.

1. (1) Owners and operators of underground storage tank (UST) systems must report to the department within twenty-four (24) hours and follow the procedures for release investigation and confirmation in 10 CSR 20-10.052 for any of the following conditions:

   1. (A) The discovery by owners and operators or others of released regulated substances at the UST site or in the surrounding area (such as the presence of free product or vapors in soils, basements, sewer and utility lines and nearby surface water);
   2. (B) Unusual operating conditions observed by owners and operators (such as the erratic behavior of product dispensing equipment, the sudden loss of product from the UST system or an unexplained presence of water in the tank), unless system equipment is found to be defective but not leaking and is immediately repaired or replaced; and

   3. (C) Monitoring results from a release detection method required under 10 CSR 20- 10.041 and 10 CSR 20-10.042 that indicate a release may have occurred unless—

      1. 1. The monitoring device is found to be

defective and is immediately repaired, recalibrated or replaced and additional monitoring does not confirm the initial result; and

1. 2. In the case of inventory control, a

second month of data does not confirm the initial result.

AUTHORITY: sections 319.107, RSMo Supp. 1989 and 644.026, RSMo Supp. 1993.* Original rule filed April 2, 1990, effective Sept. 28, 1990. *Original authority: 319.107, RSMo 1989 and 644.026, RSMo (1972), amended 1973, 1987, 1993.