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Site Conditions <br /> response to requests from the PHS/EHD are also <br /> included in Table 1 Concentrations of TPHg and <br /> BTEX constituents have not been detected above <br /> normal reporting limits to any of these samplings <br /> At the request of PHS/EHD, during the July 1999 <br /> sampling of the Lopez well,the samples were also <br /> analyzed for the five fuel oxygenates and 1,2- <br /> DCA None of these analytes were detected above <br /> normal reporting limits <br /> SOIL ANALYTICAL DATA <br /> Considerable soil analytical data has been <br /> collected since site investigations began in 1987 <br /> 1 Plate 4 is a plan view of the Site showing soil <br /> sample TPHg concentration data As shown on <br /> the plate,the lateral extent of the TPHg soil plume <br /> has been assessed Plate 6 is a cross-sectional <br /> i view of the Site along the line A-A' (shown on the <br /> Site Plan(Plate 3)) With the data from additional <br /> samples collected during the SSI, assessment of <br /> the vertical extent of impacted soil is complete <br /> As shown in Plates 4 and 6, TPHg-impacted soil <br /> first occurs below a depth of 5 feet bgs on the <br /> western wall of the former UST excavation The <br /> two highest TPHg soiI concentrations encountered <br /> (1,800 and 2,700 mg/kg)are present in boring SB- <br /> I at depths of 9 4 and 14 feet bgs, respectively, <br /> between the forklift shop and the former UST <br /> excavation The maximum depth of TPHg- <br /> impacted soil lies beneath the former UST <br /> 1 excavation and extends to depth of less than 25 5 <br /> feet bgs The soil plume extends west of the <br /> former UST excavation approximately 26 feet <br /> beneath the forklift shop and approximately 10 <br /> feet east of the UST excavation <br /> Also shown on Plate 4 are selected data from the <br /> Lopez site Just north of the Site As shown,the <br /> soil plume on the Lopez site is separate and <br /> distinct from that on the Site <br /> L\300001387371WP138737NI9 Harding Lawson Associates B <br />