N.M. Admin. Code § 20.5.120.2010

Current through Register Vol. 35, No. 23, December 10, 2024

Section 20.5.120.2010 - SECONDARY INVESTIGATION

A. Owners and operators shall perform a secondary investigation in accordance with a timeline approved by the department or the timeline set forth in Subsection E of 20.5.120.2000 NMAC when the department makes at least one of the following determinations about the site:

(1) the extent and magnitude of contamination in all media has not been delimited by the preliminary investigation; or

(2) the release threatens public health, safety and welfare or the environment.

B. The secondary investigation shall determine the following:

(1) the horizontal and vertical extent and magnitude of soil contamination both on and off site;

(2) the horizontal extent and magnitude of dissolved phase groundwater contamination both on and off site;

(3) the vertical extent and magnitude of dissolved phase groundwater contamination, when site conditions warrant;

(4) characteristics, aerial extent, estimated volume and apparent thickness of NAPL in wells;

(5) the elevation of groundwater and surface water and the gradient, rate and direction of groundwater and surface water flow;

(6) the rate and direction of contaminant migration;

(7) the hydrologic properties of the contaminated portion of the aquifer including hydraulic conductivity, transmissivity and storativity; the department may require field verification of estimates made from literature;

(8) whether the aquifer is perched;

(9) whether the aquifer is confined or unconfined; and

(10) any other technical information requested by the department which is reasonably necessary to meet the requirements of this part.

N.M. Admin. Code § 20.5.120.2010

Adopted by New Mexico Register, Volume XXIX, Issue 14, July 24, 2018, eff. 7/24/2018