FIELD DOCUMENTS_CASE 1 - Laserfiche WebLink

Home Browse Search

V r �- 1.0 Introduction IT Corporation has prepared this report on behalf of Pacific Gas and Electric Company (Company) to document excavation, sampling and disposal of soil containing total petroleum hydrocarbons (TPH) encountered during upgrading of product delivery lines and dispensers at the Company's Stockton Service Center, 4040 West Lane, Stockton, California(Figure 1). `' i.t Background The storage and dispensing system for unleaded gasoline and diesel storage tanks, manufactured by Buffalo Hide m, are each 10,000 gallons in capacity. They are both constructed of double- wall steel, and their exterior surfaces are coated with a protective barrier of fiberglass- impregnated plastic resin. A piping sump is mounted on top of each tank. Each of the piping sumps houses a submersible turbine pump that delivers fuel under pressure through underground piping to island-mounted dispensers. The primary fuel piping is 2-inch nominal diameter, and the secondary containment piping is 3-inch nominal diameter. The diesel product piping measures approximately 70 feet in length. The gasoline product piping measures approximately V 110 feet in length. The diesel tank, piping, island, and dispenser are located in the southern part of the dispensing area (Figure 2). The gasoline tank, piping, island, and dispenser are located to the north. The islands are separated by approximately 45 feet. The original fiberglass piping sumps were manufactured by Buffalo Hide. The original piping was Red ThreadT'" double-wall fiberglass manufactured by A. O. Smith. 1.2 Previous Work V The former product delivery lines were removed under a closure plan approved by San Joaquin County Public Health Services,Environmental Health Division. During the upgrade, the original V fiberglass piping sumps were replaced with new fiberglass sumps manufactured by Phil-TiteTM. Although the original piping appeared to be intact, except for a leak found in the primary diesel line, it was replaced in its entirety. The replacement piping is A. O. Smith Red Thread RTM. On November 20, 2000, Twining Laboratories, Inc. (Twining) collected seven soil samples from V the area around the product dispensers and delivery lines and one composite sample from the soil stockpile. The Twining report is included as Appendix A. Twining analyzed the soil samples V for total petroleum hydrocarbons as gasoline and diesel (TPHG and TPHD, respectively)using gas chromatography/flame ionization detection, benzene, toluene, ethylbenzene, and total xylenes (BTEX) and methyl tert butyl ether(MTBE) using U.S. Environmental Protection SacDP-\\SACRFPACOMMOMracDA2ooi\PRAPJ81821924.1..d. —q 411JVr 1 V