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. Site Background Information,;
<br /> 'WELDON CHURCH.PROPERTY
<br /> Iv aCalifornia- - 104 West Beverly.Place,Tracy, C • , - . '
<br /> UNDERGROUND STORAGE TANK REMOVAL-
<br /> '
<br /> I The;UST system was removed in 1988. Ground water was encountered in the tank excavation during
<br /> removal. Subsequently,one soil and one grab.water sample were collected frorn the;tank excavation
<br /> in August 1988.
<br /> Both samples were analyzed, for total.petroleum hydrocarbons quantified as gasoline (TPH-g),
<br /> stoddard'solvents,paint thinner, diesel,kerosene, motor oil(TPH-ss, TPH-thinner, TPH-d;TPH-k'
<br /> and TPH'mo)and volatile aromatics(benzene,toluene and total xylene).TPH-g;toluene and xylenes
<br /> were detected in the soil sample at concentrations of 560 milligrams per kilogram(mg/kg),21 mg/kg
<br /> rand 79 mg/kg,respectively.TPH-g,benzene;toluene and xylenes were detected'in the water-sarriple
<br /> at concentrations•of,L17,000.micrograms per liter(pig/.I), 10,100,µg/l, 11,300µg/1 aria 9,330 gg/l, "
<br /> respectively:
<br /> IEXCAVATION OF UNDERGROUND STORAGE'TANK AREA
<br /> The former UST,area was. excavated on 24-August 1995 to remove impacted soil. Excavation
<br /> procedures were supervised by a representative of-AGE. Soil was excavated to a depth of 12 feet
<br /> below surfacegrade'(bsg). Approximately'1.00 cubic yards of impacted soil were removed from the `
<br /> former UST area.
<br /> TPH-g was detected in the soil sample collected'at a depth of 8.feet bsg from-the sidewall of the „
<br /> excavation at concentrations as high as 5,800 mg/kg`and benzene was detected in the samples at a'
<br /> maximum.concentrations of54 mg/kg. Petroleum'hydrocarbons were not detected in soil samples,
<br /> collected from the floor of the excavation at a depth of 12.feet bsg:'TPH-g was detected in stockpile ,
<br /> soil samples at a concentration of 440 mg/kg and volatile aromatic compounds -,benzene, toluene,
<br /> = ethylbenzene,and total xylenes(BTEX)were detected at concentrations of 1.1 mg/kg; 12 mg/kg,8.1
<br /> 'mg/kg and.40,mg/kg,respectively..The excavated soil-was stockpiled adjacent,to the excavation on
<br /> plastic sheeting. ;
<br /> On 09,October 1996, approximately 100 cubic.yards of,stockpiled sail were,transported to Forward
<br /> Incorporated, a Class :H,.landfill located Jh:Manteca, California. Soil was loaded into transport ' ;
<br /> vehicles by Stokley Construction of Tracy,.C alifomia and hauled to Forward by Bob Evaris Trucking
<br /> of Manteca,California."The disposal of.the'soils was summarized in the Quarter_Iy'Report prepared .
<br /> by AGE,'dated 21 November 1996. ;
<br /> SITE ASSESSMENT ACTIVITIES
<br /> Six soil probe borings were advanced at the site ori 20 December.1996. Soil and water samples'were' '
<br /> Advanced GeoEnvironmentat,ine-_
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