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3 <br /> The developed section of the facility, consisting of approximately seven acres, is <br /> relatively flat-lying and almost entirely covered with asphalt or concrete As shown on <br /> Figure 2, the main plant building covers about two acres <br /> An approximately 1,000-foot-long stormwater drainage ditch extends westerly from <br />' <br /> the facility to an intermittent south-flowing drainage canal This canal empties into Duck <br />' Creek, which is located about 900 feet south of the plant <br /> 1.2 Previous Work <br /> The four USTs previously located at the Earth Grains facility have been removed <br /> Three of the USTs were owned and operated by Rainbo, one UST was operated by Earth <br /> Grains <br /> Rainbo's 10,000-gallon diesel-fuel tank and two 6,000-gallon gasoline tanks were <br /> located near the southwest corner of the bakery building Earth Grain's UST, a <br /> 20,000-gallon diesel-fuel tank, was located in the parking lot on the east side of the facility <br /> Rambo's gasoline tanks were removed in April 1987 The easternmost gasoline UST <br /> had previously been abandoned in place, prior to 1986, by removing remaining fuel product <br /> and filling the tank with sand The two diesel-fuel USTs were removed in September 1989 <br /> The westernmost gasoline UST failed a tank integrity test in December 1986, which <br /> suggested the potential for subsurface petroleum impact Approximately 450 cubic yards of <br /> soil was excavated during removal of the two USTs in 1987 Environmental Science and <br /> Engineering, Inc (ESE) estimated that 120 cubic yards of the excavated soil were impacted <br /> by gasoline This soil was disposed of offsite <br /> ' In July and September 1987, ESE installed three groundwater monitoring wells <br /> (MW-1 through MW-3) at the facility to assess potential gasoline impact to groundwater <br /> ' Monitoring Well MW-1 is a 4-inch diameter PVC well screened from 31 to 76 feet BGS <br /> Monitoring Wells MW-2 and MW-3 are 2-inch diameter PVC wells that are screened from <br /> ' about 22 to 55 feet BGS <br /> A groundwater sample collected in July 1987 from Monitoring Well MW-1 contained <br /> a total petroleum hydrocarbons (TP14) concentration of 78 milligrams per liter (mglL), and <br /> ' 04/94/121382/125997/STOCKREP REP/i <br />