WAC 173-360-390   Site assessment at closure or change-in-service.  (1) Before permanent closure or a change-in-service is completed, except as specified in subsections (2), (3), and (4) of this section, owners and operators shall have a person registered by the department to perform site assessments, as specified in WAC 173-360-610, sample for the presence of a release. Such samples shall be taken, analyzed, and the results reported to the department or delegated agency in accordance with the department's guidance document for site assessments, or as otherwise directed by the department or delegated agency, where contamination is most likely to be present at the UST site.

     (2) The requirements of this section are satisfied if one of the external release detection methods allowed in WAC 173-360-345 (6)(f) and (g) is employed for the UST system being closed or undergoing a change-in-service, if the following conditions are met:

     (a) The external release detection method is operating, at the time of closure or change-in-service, in accordance with the requirements of WAC 173-360-345 (6)(f) or (g), as applicable; and

     (b) A report is provided to the department with sufficient information to clearly demonstrate that:

     (i) The external release detection method employed was appropriately designed, installed, and operated to adequately detect any releases from the UST system; and

     (ii) No release was detected from the UST system.

     (3) If the department determines that the conditions specified in subsection (2)(a) and (b) of this section have not been satisfactorily met, the department may require that a site assessment be performed for the site.

     (4) If contaminated soils, contaminated groundwater, or free product is discovered under subsection (1) of this section, or by any other manner, owners and operators shall report to the department or delegated agency in accordance with WAC 173-360-372 and take appropriate action in accordance with WAC 173-360-399.

     (5) Persons who perform site assessments shall certify that such site assessments comply with the requirements of this section by submitting the appropriate checklist to the department in accordance with WAC 173-360-630(12).



[Statutory Authority: Chapter 90.76 RCW. 91-22-020 (Order 91-26), § 173-360-390, filed 10/29/91, effective 11/29/91; 90-24-017, § 173-360-390, filed 11/28/90, effective 12/29/90.]