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September 4, 1997 <br /> Page 4 <br /> • PID measurements indicated detectable concentrations ranging from approximately <br /> • 10 feet bgs to 35 feet bgs, with concentrations decreasing from 25 feet bgs to 35 feet <br /> bgs The maximum concentration detected was 1,830 ppm at approximately 25 feet <br /> bgs PID measurements on samples at and below a depth of 40 feet bgs were <br /> nondetectable <br /> • TPH-g reported in soil samples collected from Boring B-7 ranged from 1,700 ppm <br /> at approximately 26 feet bgs to nondetectable levels at approximately 46 feet bgs <br /> Analytical soil results reported nondetectable levels of benzene throughout the total <br /> depth explored, consistent with the results of pit samples collected previously Lead <br /> was detected in one soil sample collected at approximately 26 feet bgs at 5 2 ppm <br /> Soil analytical data is presented on Table I <br /> • Analytical groundwater "grab" sample results reported TPH-g at 32,000 parts per <br /> billion Benzene and lead were reported at nondetectable levels Groundwater <br /> analytical data is presented on Table 2 <br /> CONCLUSIONS <br /> • The vertical extent of petroleum hydrocarbons to soil appears to be defined in the <br /> vicinity of Boring B-7 to nondect levels at approximately 46 feet bgs, however, <br /> groundwater analytical results indicate that site groundwater has been impacted by <br /> gasoline hydrocarbons The lack of benzene to both soil and groundwater"grab" <br /> samples suggest that the hydrocarbons detected are weathered <br /> If there ate any questions regarding the contents of this report, please call us at <br /> (916) 859-2350 <br /> Sincerer <br /> i , Environmental Group, Inc <br /> Dennis M Tones <br /> Staff Geologist <br /> `' { GREG A <br /> ( BARClAY <br /> Gregarc.lay t e � <br /> P101ec.t GLolog►st \,� <br /> F C <br /> R(j 6260 0 <br /> Q2011,I) [W'I WRI'RI <br />