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UST REMOVAL WORKPLAN US POSTAL SERVICE - STOCKTON BRANCH _ APRIL, 1998 Underground Tank Removal _ The tanks will be removed in accordance with the tank removal and sampling protocol included in Attachment A and as described below. — • GHH will obtain the necessary permits from PHS/EHD, AQMD, PWD, OSHA, and FD. A Site Health and Safety Plan included in Attachment B will be maintained on-site. • Prior to excavation of the tank area, the UST will be pumped of residual product and triple rinsed by Ramos Environmental Services(RES). All residual product and rinseate will be transported to an appropriate disposal facility under a hazardous waste manifest prepared by RES or an approved sub-contractor. • The top and sides of the UST with associated piping will be exposed and visually inspected for abnormalities. The product piping will then be removed and disposed of with the UST. • Approximately 20-pounds of dry ice per 1,000-gallon capacity will be placed into each tank a minimum of two hours prior to the removal of the tank from the excavation. All regular openings in each tank will be sealed with plugs or caps. One plug will have a 1/8- inch vent hole for purging of the tank. During this time the tanks will be monitored with a _ percent lower explosion limit (LEL) meter and an oxygen meter. Once the percent LEL is below 10 percent and the oxygen level is below 5 percent, the tanks will be removed from the excavation with approval from the FD and PHS/EHD inspectors. The exterior of each tank will be cleaned and visually inspected for signs of leakage. • Once inspection is completed the tank will be placed on a trailer and transported to West — Coast Equipment Company(WCE), an approved hauler, under a non-hazardous /hazardous manifest. If WCE is unable to respond tanks will be delivered to Triangle Steel Inc. located in Sacramento. A certificate of destruction will be obtained and included in the tank removal report prepared by URS/Griner. • Upon completion of the tank removal and under direction of PHS/EHD the minimum — number of soil samples required by the Tri-Regional Guidelines will be collected form approximately 2-feet below the bottom of each end of the excavated tanks and along side walls. One soil sample will be collected for every 20 linear feet of product piping; one soil sample will also be collected from under each fuel dispenser; and eight samples per 50 cubic yards (cy) of spoils will be collected from the soil stockpiles and composited into two samples at the laboratory. Soil sampling will be completed by personnel from URS Greiner. Additional soil samples may be collected as directed by the PHS/EHD inspector. 2