### 14457 Federal Register / Vol. 78, No. 44 / Wednesday, March 6, 2013 / Rules and Regulations

[FR Doc. 2013–05112 Filed 3–5–13; 8:45 am]

**BILLING CODE 6560–50–P**

**ENVIRONMENTAL PROTECTION AGENCY** 

**40 CFR Parts 60 and 63**

**[EPA–HQ–OAR–2008–0708, FRL–9756–4]**

**RIN 2060–AQ58**

**National Emission Standards for Hazardous Air Pollutants for**  **Reciprocating Internal Combustion Engines; New Source Performance**  **Standards for Stationary Internal Combustion Engines** 

Correction

In rule document 2013–01288, appearing on pages 6674–6724 in the issue of Wednesday, January 30, 2013, make the following corrections:

**§ 63.6655 [Corrected]**

■ 1. On page 6708, the heading in Table 2c to Subpart ZZZZ of Part 63 is corrected read as follows:

Table 2c to Subpart ZZZZ of Part 63. Requirements for Existing Compression Ignition Stationary RICE Located at a Major Source of HAP Emissions and Existing Spark Ignition Stationary RICE

≤ 500 HP Located at a Major Source of HAP Emissions

■ 2. On page 6708, in the first column of Table 2c to Subpart ZZZZ of Part 63, the entry reading ‘‘4. Non-Emergency, non-black start CI stationary RICE
300>HP ≤ 500.’’ is corrected to read ‘‘4. Non-Emergency, non-black start CI stationary RICE 300<HP ≤ 500.’’

■ 3. On page 6709, the heading in Table 2c to Subpart ZZZZ of Part 63 is corrected read as follows:

Table 2c to Subpart ZZZZ of Part 63. Requirements for Existing Compression Ignition Stationary RICE Located at a Major Source of HAP Emissions and Existing Spark Ignition Stationary RICE

≤ 500 HP Located at a Major Source of HAP Emissions—Continued

[FR Doc. C1–2013–01288 Filed 3–5–13; 8:45 am]

**BILLING CODE 1505–01–D ENVIRONMENTAL PROTECTION**  **AGENCY**

**40 CFR Part 136**

**[EPA–HQ–OW–2010–0192; FRL–9787–7]**

**Guidelines Establishing Test Procedures for the Analysis of**  **Pollutants Under the Clean Water Act; Analysis and Sampling Procedures;**  **Notice**

**AGENCY :**  Environmental Protection Agency (EPA).

**ACTION :**  Notice of final decision.

**SUMMARY :**  EPA discussed, but did not propose, a new method, ASTM D7575, for oil and grease in the 2010 proposed Methods Update Rule (MUR). Oil and grease is a method-defined parameter. That is, the nature and amount of material determined by the method is defined in terms of the method. EPA subsequently published a Notice of Data Availability (NODA) on this method that provided new data and requested comment on whether and how EPA should approve the method in Part 136 as an alternative oil and grease method. This document provides EPA’s final decision on its reconsideration of this method.

**DATES :**  March 6, 2013.

**FOR FURTHER INFORMATION CONTACT :**  Jan Matuszko, Office of Science and Technology, Office of Water (4303–T), Environmental Protection Agency, 1200 Pennsylvania Avenue NW.; Washington, DC 20460; telephone number: 202–566– 1035; fax number: 202–566–1053; email address: matuszko.jan@epa.gov.

**SUPPLEMENTARY INFORMATION :**  I. Background A. CWA Analytical Methods and Limited Use Alternate Test Procedures (ATP) Program

EPA establishes test procedures (also referred to as analytical methods) codified in 40 CFR Part 136 under its authority in section 304(h) of the CWA to promulgate guidelines establishing test procedures for the analysis of pollutants. EPA’s regulations provide that, when EPA has promulgated a test procedure for analysis of a specific pollutant in 40 CFR Part 136, an NPDES permittee must use an approved test procedure for the specific pollutant when measuring the pollutant for an application submitted to EPA or to a State with an approved NPDES program and for reports required to be submitted by dischargers under the NPDES program. See 40 CFR § 136.1(a). This approach simplifies the permitting process for hundreds of thousands of NPDES and indirect discharging permittees and permitting authorities. In the absence of an approved test procedure for a specific pollutant (or when an approved test procedure does not work in a specific matrix, e.g., because of a matrix interference), generally, a permit applicant may use any suitable method but must provide the permitting authority a description of the method for evaluation of its suitability. See 40 CFR 122.21(g)(7). However, 40 CFR Part 136 also recognizes that new technologies and approaches are constantly being developed, including methods for pollutants for which EPA already has an approved test procedure. As such, Part 136.5 allows for use of an alternate method for a specific pollutant or parameter in a regulated CWA matrix that is different from the approved test procedure (i.e., limited use approval). Requests for such uses, along with supporting data, are made to the applicable Regional Alternate Test Procedure (ATP) Coordinator for consideration and approval.

B. Oil and Grease

Unlike many parameters, oil and grease is not a unique chemical entity, but is a mixture of chemical species that varies from source to source. Common substances that may contribute to oil and grease include petroleum based compounds such as fuels, motor oil, lubricating oil, soaps, waxes, and hydraulic oil and vegetable based compounds such as cooking oil and other fats. Oil and grease is defined by the method used to measure it (i.e., it is a method-defined analyte). The CWA defines oil and grease as a conventional parameter and hundreds of thousands of NPDES permits and indirect discharging permits contain oil and grease numerical limits. Currently, Part 136 lists two analytical methodologies for the measurement of oil and grease in such discharge permits. Permittees have been using EPA Method 1664A to measure compliance with such discharge limits. Method 1664A is a liquid/liquid extraction (LLE), gravimetric procedure that employs normal hexane (n -hexane) as the extraction solvent that is applicable for measuring oil and grease in concentrations from 5 mg/L to 1,000 mg/L. This method also allows the use of solid-phase extraction (SPE) provided that the results obtained by SPE are equivalent to the results obtained by LLE. C. Method-Defined Analytes

The measurement results obtained for a method-defined analyte are both