Mich. Admin. Code R. 29.2155 - Assessing site at closure or change in service

Rule 55. Section 280.72 is amended by to read as follows:

Section 280.72.

(a) Before permanent closure or a change in service is completed, owners and operators shall measure for the presence of a release where contamination is most likely to be present at the UST site. In selecting sample types, sample locations and measurement methods, owners and operators shall consider the method of closure, the nature of the stored substance, the type of backfill, the depth to ground water, and other factors appropriate for identifying the presence of a release. The requirements of this section are satisfied if 1 of the external release detection methods allowed in section 280.43(e) and (f) is operating in accordance with the requirements in section 280.43 at the time of closure, and indicates no release has occurred.

(b) If contaminated soils, contaminated groundwater, or visible NAPL as a liquid or vapor is discovered, under subsections (a) or (c) of this section or in any other manner, then the owners and operators shall report a confirmed release in accordance with section 280.61 and begin corrective action in accordance with subpart F of these rules and part 213 of 1994 PA 451, MCL 324.21301a to 324.21334.

(c) Visible or olfactory evidence of a regulated substance in the UST excavation constitutes a confirmed release. Positive indication from field screening instruments constitutes a suspected release.

(d) Upon closure or a change in service of an UST, the owners and operators shall perform a site assessment in compliance with either of the following provisions:

(1) Two soil borings must be taken as close as practical to the tank, but not more than 5 feet from the tank. One boring must be taken at each end of the tank, but not more than 2 feet below the bottom of the tank and the boring must be taken at the bottom of each end of the tank.

(2) Upon removal of an UST, the owners and operators shall perform a site assessment in compliance with either of the following provisions:

(i) One discrete sample must be taken from the excavation floor underneath the fill pipe area for each tank removed and 1 discrete sample must be taken from the excavation floor underneath the opposite end of the tank.

(ii) One water sample must be taken if the entire floor of the excavation is covered with water or a 1-for-1 water-for-soil sample must be taken if the excavation is partially covered with water.

(e) Additional sample or samples must be taken when deemed necessary by the department or the person who performs the site assessment.

(f) A site assessment for piping must be performed after emptying and purging the piping run or after the removal of piping. The site assessment shall consist of 1 discrete sample for every 30 feet of the underground piping run, starting at the dispenser location or the furthest point from the tank and moving towards the tank.

(g) Samples must be analyzed using the following testing methods:

(1) An appropriate method listed in the United States environmental protection agency standard entitled "Test Methods For Evaluating Solid Waste; Physical/Chemical Methods," SW-846 document.

(2) Other testing methods determined by the department to be equally effective in assessing the level of contamination.

(h) Copies of site assessment results must be submitted to the department within 45 days of the sampling date, together with the site assessment report form provided by the department. The owner and operator shall complete the information specified on the form and shall provide a site map that indicates the location of tanks and piping and that identifies the depth and location of the samples taken. The site assessment report shall also include a copy of the laboratory report that indicates the test methods used in the analyses and the chain of custody of the samples.

Notes

Mich. Admin. Code R. 29.2155

1998-2000 AACS; 2018 MR 21, Eff. 11/14/2018