N.M. Code R. § 19.11.4.18 – Table 1 – Closure Criteria for Soils Beneath Drying Pads Associated with Closed-loop Systems

Depth below bottom of pit to ground water less than 10,000 mg/l TDS Constituent Method* Limit** ≤50 feet Chloride EPA 300.0 600 mg/kg 51-100 feet Chloride EPA 300.0 10,000 mg/kg >100 feet Chloride EPA 300.0 20,000 mg/kg

Depth below bottom of pit to ground water less than 10,000 mg/l TDS

Constituent

Method*

Limit**

≤50 feet

Chloride

EPA 300.0

600 mg/kg

51-100 feet

Chloride

EPA 300.0

10,000 mg/kg

>100 feet

Chloride

EPA 300.0

20,000 mg/kg

*Or other test methods approved by the division

**Numerical limits or natural background level, whichever is greater

[19.11.4.18 NMAC - N, 2/27/2018]