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<br /> I h Subject Interim Report on Subswrface'Investigation Work at Cheapen #37 15 ?�
<br /> East Grant_ Line-Road,"Tracy, California
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<br /> i - .Dear Mr. Johnson
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<br /> Parker Environmental Services rs'pleased to_,prW6 this rnterrnt letter.'report ;
<br /> concerning the subsurface nvestigahon'twork completed at'�Cheapert #37 as i
<br /> outlined'`by,our work plan'dated'De�ember,4, 1992:'All works desc4bed in}the work^
<br /> 4
<br /> r
<br /> plan has beencomp leted and is described in this.report: `
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<br /> The purposed the work into determuie the vertical-and.lateral extent
<br />#: containing petroleum hydrocarbons. This investigation;only evaluatedon site soil
<br /> and water.conditions
<br /> The scope of work for this project liricIuded conducting.seven`soil bon gs;..collecting
<br /> soil and water'samples from:each boring, and'preparing a subsurface investigation
<br /> report.
<br /> I. Introduction'and Site History -
<br /> The project site is located_ on the north side of East Grant Line Road, approximately 1
<br /> miles south of Interstate 205. -Two 10,000-gallon gasoline tanks were removed from
<br /> the property on March 3,..1988 b California.Petroleum-E ux merit Com an
<br /> Groundwater was,7 feet,below ade surface (BGS). The-tank excavation was de-
<br /> gr .
<br /> watered and sampled prior to the ni 6v tank installation.,'Soil samples showed•a high
<br /> concentration of 30;ppm�TPH-g and the water sample showed 1.5-ppm TPH-g.'' . .
<br /> Three groundwater,monitoring wells were installed by lCeinfelde'r.in April, 1988,
<br /> ;� and a fourth well in May, 1988. Groundwater flow was to the north with a slope of
<br /> Recycled Paper
<br /> 4185 Rialto Court • Pittsburg, CA 94565 • FAX (510) 439-2566 • Phone(510) 439-1024
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