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Stacv Rivera fEH From: Calalang, Pauline [CSI] [PaulineCalalang@chevron.com] Sent: Friday, June 06, 2014 11:16 AM To: Stacy Rivera [EH]; Garrett Backus [EH] Subject: FW: Chevron 307709 -10858 Trinity Parkway, Stockton Attachments: Trinityl0858-042114-UST.pdf; 307709.RTC-SR.pdf; Trinity UDC Investigation.doc; 307709 work orders. 4-25-13.pdf; photo 1.JPG; photo 2.JPG; S3.retest. 5-16-14.pdf; photo 1.JPG; photo 2.jpg; photo 3.jpg; 307709MC2_21_14.pdf; 307709 retest.S3.pdf; 307709ventsump.doc; 307709 vent sump.jpeg LJ LJ LJ LJ Trinity10858-04211307709.RTC-SR.pd Trinity UDC 307709 work photo 1.]PG (1 MB)photo 2.JPG (1 MB) S3. retest. 5-16-14. 4-UST.pdf (2.., f (242 KB) Investigation.doc ...)rders.4-25-13.pdf.. pdf (193 KB)... photo 1.JPG (632 photo 2.jpg (896 photo 3.jpg (850 307709MC2_21_14 307709 307709ventsump.d 307709 vent KB) KB) KB) pdf (585 KB) retest.S3.pdf (4 MB) oc (227 KB) ump.jpeg (196 KB). Dear Stacy: This email is in response to the attached inspection report issued on April 21,2014 to Chevron Station # 307709 located at 10858 Trinity Parkway in Stockton. Below is our response regarding the items noted in the attached inspection report. #303 & 406 the liquid level in the annular space of UDCs 5/6 and 9/10, as measured from the inside top of the UDC to the level of liquid in the reservoir was low and not capable of monitoring the complete annular space. The UDC annular space liquid sensors and the vent sump annular space liquid sensor were not located at the top of the annular space to detect a drop in annular space liquid at the earliest opportunity. ii The liquid level in the annular space and the annular space liquid sensors of the UDC's and the vent sump were adjusted to the proper level. Please see attached photos. ii Wayne Perry is scheduled to raise the brine reservoirs so that the top of the sensor is in line with the breather port. #404. Water was found in the 87, 91 and diesel sumps and UDC sumps % and 11/12. The designated reports for May, June, July and November 2013 and February 2014 note liquid repeatedly found in the UDCs. Secondary containment shall be constructed to prevent any water intrusion into the system by precipitation, infiltration, or surface runoff. u The trace amounts of water found in the 87, 91 & diesel sumps appear to be the result of condensation. Condensation found in the 87, 91 and diesel sumps were removed during the inspection. la On 5/20/14 Chevron contractor (Wayne Perry) returned to the station to inspect the 87, 91 and diesel sumps for liquid, at that time, all sumps were found dry. u To keep track on the condensation, the Designated Operator will continue to perform a visual inspection and will address issues if deficiencies found. u Wayne Perry replaced the leaking meters in the UDC '/, and 11/12 which caused liquid in the UDCs. U Wayne Perry performed vacuum test for interstitial space on UDC X and 11/12, both 1