N.M. Admin. Code § 20.6.4.14

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

Section 20.6.4.14 - SAMPLING AND ANALYSIS

A. Sampling and analytical techniques shall conform with methods described in the following references unless otherwise specified by the commission pursuant to a petition to amend these standards:

(1) "Guidelines Establishing Test Procedures For The Analysis Of Pollutants Under The Clean Water Act," 40 CFR Part 136 or any test procedure approved or accepted by EPA using procedures provided in 40 CFR Parts 136.3(d), 136.4, and 136.5;

(2)Standard Methods For The Examination Of Water And Wastewater, latest edition, American public health association;

(3)Methods For Chemical Analysis Of Water And Waste, and other methods published by EPA office of research and development or office of water;

(4)Techniques Of Water Resource Investigations Of The U.S. Geological Survey;

(5)Annual Book Of ASTM Standards: volumes 11.01 and 11.02, water (I) and (II), latest edition, ASTM international;

(6)Federal Register, latest methods published for monitoring pursuant to Resource Conservation and Recovery Act regulations;

(7)National Handbook Of Recommended Methods For Water-Data Acquisition, latest edition, prepared cooperatively by agencies of the United States government under the sponsorship of the U.S. geological survey; or

(8)Federal Register, latest methods published for monitoring pursuant to the Safe Drinking Water Act regulations.

B.Bacteriological Surveys: The monthly geometric mean shall be used in assessing attainment of criteria when a minimum of five samples is collected in a 30-day period.

C.Sampling Procedures:

(1) Streams: Stream monitoring stations below discharges shall be located a sufficient distance downstream to ensure adequate vertical and lateral mixing.

(2) Lakes: Sampling stations in lakes shall be located at least 250 feet from a discharge.

(3) Lakes: Except for the restriction specified in Paragraph (2) of this subsection, lake sampling stations shall be located at any site where the attainment of a water quality criterion is to be assessed. Water quality measurements taken at intervals in the entire water column at a sampling station shall be averaged for the epilimnion, or in the absence of an epilimnion, for the upper one-third of the water column of the lake to determine attainment of criteria, except that attainment of criteria for toxic pollutants shall be assessed during periods of complete vertical mixing, e.g., during spring or fall turnover, or by taking depth-integrated composite samples of the water column.

D. Acute toxicity of effluent to aquatic life shall be determined using the procedures specified in U.S. environmental protection agency "Methods for Measuring The Acute Toxicity of Effluents and Receiving Waters To Freshwater and Marine Organisms" (5th Ed., 2002, EPA 821-R-02-012), or latest edition thereof if adopted by EPA at 40 CFR Part 136, which is incorporated herein by reference. Acute toxicities of substances shall be determined using at least two species tested in whole effluent and a series of effluent dilutions. Acute toxicity due to discharges shall not occur within the wastewater mixing zone in any surface water of the state with an existing or designated aquatic life use.

E. Chronic toxicity of effluent or ambient surface waters of the state to aquatic life shall be determined using the procedures specified in U.S. environmental protection agency "Short-Term Methods For Estimating The Chronic Toxicity Of Effluents And Receiving Waters To Freshwater Organisms" (4th Ed., 2002, EPA 821-R-02-013), or latest edition thereof if adopted by EPA at 40 CFR Part 136, which is incorporated herein by reference. Chronic toxicities of substances shall be determined using at least two species tested in ambient surface water or whole effluent and a series of effluent dilutions. Chronic toxicity due to discharges shall not occur at the critical low flow, or any flow greater than the critical low flow, in any surface water of the state with an existing or designated aquatic life use more than once every three years.

F. Emerging Contaminants Monitoring: The department may require monitoring, analysis and reporting of emerging contaminants as a condition of a federal permit under Section 401 of the federal Clean Water Act.

N.M. Admin. Code § 20.6.4.14

20.6.4.14 NMAC - Rp 20 NMAC 6.1.1106, 10-12-00; Rn, 20.6.4.13 NMAC, 05-23-05 & A, 05-23-05; A, 12-01-10, Amended by New Mexico Register, Volume XXXIII, Issue 07, April 5, 2022, eff. 4/23/2022