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SAN aOAQUIN Environmental Health Department COUNTY— Greatness#rows here. Underground Storage Tank Program Inspection Report Facility Name: Facility Address: Date: CHEVRON STATION #94275" 12905 W BENJAMIN HOLT DR STOCKTON December 15 2025 10 2638(c), 2638(d) 2030074-Annual Monitoring System Certification Form to the CUPA within 30 days of completion of the test OBSERVATION: According to work orders and test results found on site, a monitoring system certification for the S1 (87 product) sensor replacement was performed on 9/10/25. A test report has not been submitted to the EHD or the California Environmental Reporting System (CERS). REGULATION GUIDANCE: A copy of the test report must be submitted within 30 days of the test. CORRECTIVE ACTION: Immediately provide this report to the EHD. This is a (Minor)Violation. 28 2638(a), 26410) 2030043- Leak detection equipment properly installed, calibrated, operated, and maintained (TCR 9d) OBSERVATION: 1) The panel programming (labeling)for vacuum sensors does not match the labeling on the "vacuum smart sensor table" provided with the monitoring site plan, nor the set up of the sensors on site. Each vent line was observed being monitored by its own smart sensor. The panel has S19 labeled as "all vents". The vent sump is not identified. The individual vent piping for the three products is not listed on any other sensors. According to the "vacuum smart sensor table" S19 is "supreme vent line-vent sump". 2)All vent lines were observed being monitored by separate vacuum sensors in their individual STP sumps. They were also observed manifolded together by a fitting inside the vent sump, indicating each vent line is connected to three separate vacuum sensors. The Veeder-Root vacuum sensor manual indicates "one each is required" of secondary piping vacuum monitoring kits for piping monitoring. REGULATION GUIDANCE: All monitoring equipment shall be installed, calibrated, operated, and maintained in accordance with manufacturer's instructions, and certified for operability, proper operating condition, and proper calibration. CORRECTIVE ACTION: Immediately contact a properly licensed and certified contractor to ensure vacuum zones are properly monitored, under permit and inspection by EHD if necessary. Ensure that all leak detection equipment is properly programmed and maintained at all times. This is a Repeat (Class 2)Violation. 35 25290.1(e) 2030065- Interstitial space of the UST is under constant VPH monitoring (TCR 9d) OBSERVATION: 1) The S4 (87 STP sump)vacuum sensor failed when tested. 2) The S1 (87 product)vacuum sensor was in no vacuum alarm from 8/14/25 until 9/10/25, and was incapable of detecting a leak during this time. According to the work order and test result on site, the sensor was replaced on 9/10/25, clearing the alarm. REGULATION GUIDANCE: The interstitial space of the UST shall be maintained, as designed, under constant vacuum or pressure such that a breach in the primary or secondary containment is detected before the hazardous substance is released into the environment. CORRECTIVE ACTION: The S4 sensor was replaced and retested during the inspection. Ensure all sensors are maintained functional and capable of detecting a breach in the primary or secondary containment before the hazardous substance is released to the environment. This is a Repeat (Class 2)Violation. EHD-CUPA Inspection Report IS03 Page 5 of 7 FA0003712 PR0231952 4588104 1/28/2026 CP22-U aST FULL g 1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209 464-0138 1 www.sjgov.org/EHD