REMOVAL_1995 - Laserfiche WebLink

Home Browse Search

0 • • A4.3 Task 3 - Removal and Disposal of Piping and Contents There are approximately 100 linear feet of underground fuel lines beneath the asphalt pavement. These pipes will be located using an electronic locating equipment. Following exposure, the exposed piping will be gravity drained into the tank by lifting the piping section farthest from the tank first and draining any liquids in the farthest section to sections of piping closer to the tank. Draining will proceed by lifting sections of the piping closer and closer to the tank. The drained pipeline liquids will be removed from the tanks by a vacuum truck. The piping will then be flushed with water from a high pressure washer and drained in the same manner as described above. The piping will then be disassembled at the joints. Welded pipe will be cold-cut using an air-operated pneumatic saw. Cutting will be performed after the piping has been flushed and inerted. Water will be sprayed over the area of pipe being cut to prevent heat buildup and sparking. Upon removal, the piping and soil beneath the piping will be inspected for signs of leakage. The inspection will be documented in the field logbook and in photographs. The COR will be notified if at any time during piping removal a leak is identified. If visual inspection of the piping indicates that the integrity of the piping may be • suspect, the flushing will take place in a 30 foot by 10 foot bermed area. The flushing area, located within the exclusion zone, will be lined with 20 mil plastic sheathing. The atmosphere in the pipe will be monitored for combustible vapors using an explosimeter, which is calibrated against methane. The explosimeter probe will be inserted into the ends of the piping without touching the walls of the piping. The piping will be flushed until the flammable vapor concentration is less than 10% of the lower explosion limit (LEL). The piping will then be transported to Erickson's facility in Richmond, California, where it will be cleaned and cut up for scrap. A4.4 Task 4 - Removal and Disposal of Tank and Contents The UST will be inspected for the presence of residual diesel fuel that was once stored in the tank. If present, a sample of the tank contents may be collected from the tank to provide information for proper handling and disposal of the liquid. A vacuum truck will be used to pump liquid and residues from the UST. The vacuum truck electrical ground will be bonded to the tank as well as to a ground-rod. Procedures associated with content removal are provided in the QC Program of the GMP under Sections B4.3.3 (Exposing Tank And Piping, Gravity Draining Piping), 84.3.4 (Sampling, Removal, and Disposal of Tank Contents), and 84.3.5 (Gravity Draining Tanks). The San Joaquin County Department of Public Health will be • given 48 hours notice before pulling the tank. A-3