Louisiana Parishes

Effective Redesignation Date: 10/17/95 (60 FR 43020, 8/18/95)

Maintenance Plan - Key Features

• 1990 base year; 1990 attainment year
• ambient air monitoring sites will remain active at their present locations during the maintenance period. These data will be quality assured and submitted to AIRS on a monthly basis.
• LDEQ will submit a revised plan during year 8 of the maintenance period to provide for maintenance of the ozone NAAQS for the next 10 years

Contingency Plan Triggers

• First trigger: a second exceedance of the ozone NAAQS within any consecutive 3 year period
• Second trigger: third exceedance of the ozone NAAQS during any consecutive 3 year period

Contingency Measures

• First trigger: LDEQ will promulgate a rule change to implement VOC offsets in the applicable parish
• Second trigger: LDEQ will promulgate a rule revision to place new CTG or ACT rules (where applicable) in the affected parish

Schedule

- First trigger

• rule change to implement VOC offsets submitted to EPA within 9 months

- Second trigger

• offset rule implementation immediately upon verification of a third exceedance
• new CTG or ACT rules submitted to EPA within 9 months
• implementation of CTG or ACT rules immediately upon verification of violation of ozone NAAQS

For further information:

Tom Diggs

Planning Section (6T-AP), Air Programs Branch
U.S. EPA, Region VI
1445 Ross Avenue
Dallas, TX 75202-2733

Telephone: (214) 665-7214; Email: diggs.tom@epa.gov

A violation has occurred in: Lafourche County, Louisiana

A fourth exceedance occurred on 8/27/95. The data were quality assured after this date.

Actions

• Chevron permit was revised to get 695 tons per year additional reductions by installing a vapor recovery unit in December 1995.
• Flash gas emissions have been categorized as emissions applicable to waste gas disposal regulations.
• Area has claimed that the violation was due to overwhelming transport; however, Region VI staff have stated that thus far claims of transport are not founded or adequate.
• In a letter to Louisiana, Region VI has suggested that a more valid determination would be to perform some type of UAM modeling to indicate transport and that the State reevaluate emission control measures, i.e., look at sources not covered by new CTG RACT rules and VOC offsets.

Proposed correction date: (62 FR 38237, 7/17/97)

EPA proposes to correct the designation of LaFourche Parish, Louisiana to an incomplete data/nonattainment area for ozone, because LaFourche Parish violated the ozone standard prior to the effective date of the original action to redesignate from nonattainment to attainment.

Final Correction Date: 1/5/98 (62 FR 64284), 12/5/97) Back to Nonattainment