567—135.14(455B) Action levels. The following corrective action levels apply to petroleum-regulated substances as regulated by this chapter. These action levels shall be used to determine if further corrective action under rules 567—135.6(455B) through 567—135.12(455B) or rule 567—135.15(455B) is required as the result of tank closure sampling under subrule 135.15(3) or other analytical results submitted to the department. The contaminant concentrations must be determined by laboratory analysis as stated in rule 567—135.16(455B). Final cleanup determination is not limited to these contaminants. The contamination corrective action levels are:

 	Soil (mg/kg)	Groundwater (ug/L)	
Benzene	0.54	5	
Toluene	3.2	1,000	
Ethylbenzene	15	700	
Xylenes	52	10,000	
Total Extractable
Hydrocarbons—Diesel	3,800	1,200	
Total Extractable Hydrocarbons—Waste Oil	 	400	
[ARC 9011B, IAB 8/25/10, effective 9/29/10; ARC 5625C, IAB 5/19/21, effective 6/23/21]