PURPOSE: This rule describes the requirements of a site assessment, that is determining whether there has been a release from the underground storage tank system.
Editor’s Note: The secretary of state has determined that the publication of this rule in its entirety would be unduly cumbersome or expensive. The entire text of the material referenced has been filed with the secretary of state. This material may be found at the Office of the Secretary of State or at the headquarters of the agency and is available to any interested person at a cost established by state law.
- (1) Before permanent closure or a change in service is completed, owners and operators must measure for the presence of a release where contamination is most likely to be present at the underground storage tank (UST) site. In selecting sample types, sample locations and measurement methods, owners and operators must consider the method of closure, the nature of the stored substance, the type of backfill, the depth to groundwater and other factors appropriate for identifying the presence of a release. The requirements of this section are satisfied if vapor monitoring or groundwater monitoring in 10 CSR 20- 10.043(E) and (F) is operating at the time of closure and indicates no release has occurred.
- (2) If contaminated soils, contaminated groundwater or free product as a liquid or vapor is discovered under section (1) of this rule, or by any other manner, owners and operators must begin corrective action in 10 CSR 20-10.060—10 CSR 20-10.067.
- (3) Owners and operators shall follow a written procedure. To comply with this rule, the department’s UST Closure Guidance Document may be used as a written procedure. Other written procedures may be used with prior written approval of the department. AUTHORITY: sections 319.111, RSMo (Cum. Supp. 1989) and 644.026, RSMo (Cum. Supp. 1993).* Original rule filed April 2, 1990, effective Sept. 28, 1990. Amended: Filed Aug. 3, 1993, effective April 9, 1994. *Original authority: 319.107, RSMo (1989) and 644.026, RSMo (1972), amended 1973, 1987, 1993.