San Joaquin Council of Governments (SJCOG), on behalf of the City of Lathrop, is providing a DRAFT PM2.5 and PM10 Hot-spot Conformity Assessment for public review/comment and for interagency consultation. The project is the Interstate 5/Louise Avenue Interchange Improvement Project (FTIP ID SJ07-2005) and is located in San Joaquin County. The San Joaquin Valley Air Basin is in non-attainment for PM2.5 and maintenance for PM10. All related materials are available for public review/comment on the SJCOG website: https://www.sjcog.org/281/Air-Quality.
The proposed project consists of improving the existing compact diamond (Type L-1) interchange at I-5/Louise Avenue by constructing a diverging diamond interchange (DDI) to accommodate the traffic associated with growth planned in the City of Lathrop’s General Plan by. Additionally, the project would include the following major project elements, widen the existing I-5 on- and off-ramps, reconstruct the undercrossing underneath the existing freeway bridge, construct I-5 ramp metering, construct two new auxiliary lanes (less than one mile in length), provide new traffic signals, construct Class II bicycle lanes along Louise Avenue and new sidewalks along Louise Avenue.
As part of the environmental review, it is requested that the Interagency Consultation Partners concur that the project is not a “Project of Air Quality Concern” (POAQC) and will not result in new violations of Federal PM2.5 and PM10 air quality standards. The NEPA document for this project is CE (23 USC 326); therefore, Caltrans and EPA concurrences are requested.
Public comments can be submitted to Phimmasone@sjcog.org through October 13, 2025.
An interagency conference call and public meeting has been scheduled for October 15, 2025, at 1pm (PT).
Contact Person:
Ty Phimmasone, Senior Regional Planner
555 E. Weber Avenue
Stockton, CA 95202