On December 2, 2015 the United States Environmental Protection Agency (USEPA) proposed to approve San Joaquin Valley Unified Air Pollution Control District's (SJVAPCD) November 14, 2013 version of Rule 4702 Internal Combustion Engines as part of the California State Implementation Plan (SIP).  An earlier version of this Rule was approved into the California SIP on January 10, 2008.  SJVAPCD Rule 4702 applies to internal combustion (IC) engines and establishes limits on emissions of nitrogen oxides (NOx), carbon monoxide (CO), volatile organic compounds (VOC), and sulfur oxides (SOx) from IC engines.

The proposed changes to Rule 4702 include clarifying the applicability of the rule, establishing lower NOx limits for certain engines, and adding a fee compliance option.  Specifically, the proposed changes clarify that Rule 4702 Section 5.2 requirements for IC engines rated greater than 50 brake horsepower (bhp) apply to both stationary and non-stationary engines.  The proposed changes also establish a NOx emission limit of 65 ppmv for spark-ignited lean burn non-agricultural operation (non-AO) IC engines fueled with waste gas, as seen in Table 2 of the rule.  Additionally, the proposed changes add an option to pay an annual fee in lieu of complying with the NOx emission limit for non-AO spark-ignited engines.

The proposed revisions to the SJVAPCD Rule 4702 portion of the California SIP were submitted to the USEPA on May 13, 2014.  Although the November 14, 2013 version of Rule 4702 has already been adopted by SJVAPCD, the inclusion of this version of the rule in the California SIP would make it federally enforceable.  Comments regarding USEPA’s approval of the rule must be received by the USEPA no later than January 4, 2016.