COMPLIANCE INFO 1985 - 2004 - Laserfiche WebLink

Home Browse Search

Shell Facility 4315 E. Waterloo Rd. 92 PRODUCT PIPING REPLACEMENT Stockton, CA 16 March 2001 HISTORY On or about February 10, 2001, the Veeder-Root TLS -350 went into L2 Fuel Alarm (Positive Shutdown) for the Shell Station @ 4315 Waterloo Rd Stockton. Approximately 5 gallons of product was found in the pre- mium turbine sump. Station currently has DW tanks and lines with full containment for the turbines and dispensers. With this equipment, there were no concerns of product release. Product was properly removed and the station was placed in close observation. Three days later, product was again found in the same lo- cation. This time, it was observed dripping out of the secondary piping inside the sump. Premium product line was immediately taken out of service and a permit application was submitted to San Joaquin County PHS-EHD to investigate the possible problem. Line was tested with inert gas (Nitrogen) and the pressure held. Under EHD observation, additional long-term and repetitive pressure tests were performed and the pressure continued to hold. On February 16, 2001, EHD allowed the line to be operational again with the condition that the premium turbine sump was observed on a daily basis for 30 days. Daily observations were performed for about 3 weeks without any trace of product in the premium turbine sump. On March 8, 2001, approximately 2 ounces of product was found dripping out of the secondary and into the contained turbine sump. Product was taken out of service at the dispensers, EHD was informed, and additional pressure tests were performed. Pressure held again. Sump was observed for 2 more days and found increased amounts of product each day. LC Services was instructed to purge the line and investi- gate the problem. On March 14, 2001, LC Services began exploratory excavations at underground fitting locations. Investiga- tion was started at the midpoint of the line, and continued upstream or downstream depending on what was found. No residue was initially found, so the downstream path towards the sump was followed. Some residue was found in the section from the first elbow to the penetration into sump. Because pressure held through all the pressure tests, the residue was the best indicator of location. WORK PLAN Replace premium line from the turbine sump to the second 90 degree elbow and repair secondary piping in the other two excavations. New pipe will match existing (AO Smith). REMEDY Due to pressure holding, the residue inside the secondary pipe by the sump area provided the best indicator of the problem. All exposed sections upstream towards the initial excavated point were dry and no trace of residue. This indicates that the line sections upstream are tight. A conservative section of the line will be replaced to ease any concerns. The plan is to begin piping replacement on March 19, 2001. Excavations 0-