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UST Closure Report 0
<br /> Sharpe Defense Distribution Region West
<br /> Lathrop,California Page 3
<br /> The table below summarizes information about the eight USTs removed from the site. All tanks
<br /> were of single-wall, steel construction and installed in 1970.
<br /> Sharpe Tank Capacity Diameter Length Last Contents
<br /> ID No. No. (gallons) (feet) (feet)
<br /> 189821 25270 20,000 10.5 32 Diesel fuel
<br /> 189822 25271 20,000 10.5 32 Unleaded gas
<br /> 189823 25272 20,000 10.5 32 Unleaded gas
<br /> 189824 25273 20,000 10.5 32 Unleaded gas
<br /> 189825 25274 12,000 10.5 19 Diesel fuel
<br /> 189826 25275 12,000 10.5 19 Unleaded gas
<br /> 189827 25276 12,000 10.5 19 Diesel fuel
<br /> 189964 25277 550 4.0 6 Waste water collected
<br /> from other tanks
<br /> The as-built diagrams of the USTs supplied by USACE and observations made by CAL INC
<br /> during UST excavation indicate the tanks were set about 3 feet apart in a 83-foot long by 32 or
<br /> 19-foot wide area. Each tank was mounted on two concrete saddles that were 2 feet high. The
<br /> saddles were part of a series of seven underlying, 1.25 foot-thick, concrete slabs joined with
<br /> dowels. Two, 3/8 inch thick by 2-inch wide steel straps held the tanks on the saddles. The tanks
<br /> were covered with about a 2.5-foot thickness of fill.
<br /> 2.1 Lithology of Sediments in Pre-UST Installation Test Hole
<br /> The USACE drilled a 20-foot deep test hole about 11 feet south of UST No. 26, on October 19,
<br /> 1965, or about five years prior to installation of the USTs (Liquid Fuel Facility Site Plan and
<br /> Details by the USACE, 1959). The hole was drilled with a 30 inch-diameter (bucket) auger. The
<br /> summary log of the lithologies intersected in the test hole indicates the following succession:
<br /> Depth Below Lithology
<br /> Grade (feet)
<br /> 0 - 0.5 Silty sand, brown, damp, dense,probably fill.
<br /> 0.5 -4.5 Silty sand, gray, damp, sand fine grained, possible fill.
<br /> 4.5 -5.5 Sand,brown,moist, fine grained.
<br /> 5.5 -6.2 Clayey sand,buff,moist, moderately cemented.
<br /> 6.2-7.5 Silty sand, tan, moist.
<br /> 7.5 -9.0 Sandy clay, tight, gray,wet.
<br /> 9.0- 10.0 Silty sand, tan, moist.
<br /> 10.0- 11.5 Clayey sand,wet, cemented.
<br /> 11.5 - 13.5 Silty sand, gray,moist.
<br /> 13.5 - 14.5 Sandy clay, gray, moist.
<br /> ® 16.5 Water table
<br /> 16.5 - 20.0 Clayey sand, tan, saturated, water coming in fast.
<br /> N:\PROJECTS\3546\Reports\3546 UST Closure Report Draft.doc March 24,1999
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