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4.1 Tank Removal <br /> Triangle, Inc., of Sacramento, California{Tnangle) began the excavations to remove the single- <br /> wall USTs on August 18, 1993. The pavement overlying the old tanks was cut and removed, <br /> and the fill material in the tank cavity was excavated to the tops of the USTs. The pea gravel <br /> ' surrounding the fiberglass UST and the sand surrounding the steel USTs were removed from the <br /> cavity and stockpiled on-site <br /> ' On the morning of August 19, 1993, dry Triangle laced d ice in the four USTs to reduce the <br /> g P <br />' possibility of combustion during removal and transportation. Fuel vapors in the tanks were <br /> monitored for the presence of explosive conditions by Mr. Bruce DeAlberts of Triangle Vapor <br /> levels were determined to be within acceptable limits for removal by Ms Letitia Briggs of the <br /> San Joaquin County Public Health Services-Environmental Health Division (PHS-EHD) <br /> Triangle removed each UST by attaching chains to the top of the tank and lifting it with an <br /> excavator. After removal, each tank was inspected by Ms Briggs and Roux All tanks <br /> appeared to be in good condition. The four USTs were loaded onto Service Transport Lines <br />' trucks and transported from the Site to Triangle's yard in Sacramento, California for cleaning <br /> The UL numbers for the removed tanks are included on Figure 2. <br />' 42 Soil Sampling Below Removed Tanks <br />' Soil sampling in the former UST cavity was done on August 20, 1993. Eight soil samples were <br /> collected from the bottom of the excavation at a depth of 16 ft. bgs Two samples were <br /> collected below each of the removed USTs (Figure 3) <br />' Soil from the bottom of the excavations was brought up to the surface in the bucket of the <br /> excavator All soil samples were then collected in 2-inch (in.) diameter by 4-in long, clean <br /> stainless steel tubes Six to twelve inches of soil were scraped away from the surface A <br /> stainless steel tube was driven with a rubber mallet into the newly exposed soil surface and filled <br />' ROUX ASSOCIATE%INC. ® 3 Doc #A158W01I7 <br />