Laserfiche WebLink
'June 9, 1987 <br /> ELEVEn <br /> ■o <br /> Laurie Cotulla <br /> San Joaquin County j <br /> Environmental Health Dept. Y3' <br /> P.O. Box 2009 1 <br /> Stockton, CA 95201 E _ <br /> i'JVi�: :, ..�:,•;"6AL HN�1 o";LTH <br /> RE: 7-Eleven Store FERIAII-/SERVICES <br /> 2243-20632 <br /> 4627 DaVinci Drive <br /> Stockton, CA <br /> Dear Laurie: <br /> Enclosed for your review are tank test results for 1987 at <br /> the above mentioned location. <br /> Originally, on March 12 all tanks and product lines were <br /> precision tested. The west tank (unleaded) and its product <br /> line failed. All tanks and piping had passed precision <br /> testing in 1986. <br /> On March 16, I was personally on location to reinspect the <br /> nolead product line. Repairs were made to the turbine <br /> pumping unit; seals and 0-rings were replaced. Any leakage <br /> occurring as a result of defective seals and 0-rings would <br /> have caused gasoline to leak back into the tank. The loss <br /> rate by making this repair improved from -.023 GPH to -.011. <br /> On April 7, the tank top of the unleaded tank was excavated <br /> and the tank retested. The 4" bung, which reduces to 2" for <br /> vent line use, was found to be leaking. The 4" turbine riser <br /> pipe was also found to be leaking. The 4" reducer bushing <br /> and the 4" turbine riser were removed, cleaned, and re- <br /> assembled. No further problems were found during the test <br /> and the tank passed at +.025 GPH. A pipe coupling was <br /> tightened on the product line and the line tested at -.004 <br /> GPH. <br /> The vapor recovery line also received a 50 PSI hydrostatic <br /> precision test because a Red Jacket vapor recovery system is <br /> in use at this location. The vapor recovery line passed with <br /> no needed repairs. <br /> I do not believe any real loss of product occurred from the <br /> product line. Petro-Tite testing indicates that any loss <br /> over -.010 may be a leak; our loss was -.011. It was <br /> observed on tests which occurred on March 12 and 16 that the <br /> product line pressure would drop and hold steady at 30 PSI. <br /> Turbine running pressure is 22 PSI. <br /> 7-Eleven Food Stores/ Division 2299 <br /> 5820 Stoneridge Mall Road /Suite 310/ P.O. Box 404/ Pleasanton,CA 94566 / Phone (415) 463-2711 <br /> ftsio ry of <br /> oiviTHE SOUTHLAND <br /> � CORPORATION <br />