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<br /> . Background Information
<br /> AGE-NC Project No 02-0950
<br /> Page 3 of 4
<br /> water samples collected from all three borings at maximum concentrations of 550µg/1(B3),23,000
<br /> µg/1 (B 1), 6,100 µg/1 (B 1), and 33,000 pg/1 (B 1), respectively 1,2-DCA was detected in ground
<br /> water samples collected from all three borings at a maximum concentration of 54µg/1 in sample B3
<br /> EDB was detected in ground water samples collected from all three borings at a maximum
<br /> concentration of 190 µg/l in sample B2 No additional target analytes were detected at or above
<br /> laboratory detection limits in the ground water samples analyzed
<br /> Four soil borings, MW-1, MW-2, MW-3, and B4 were advanced on 09, 10, and 16 October 2003
<br /> for the collection of soil samples and installation of three ground water monitoring wells (MW-1,
<br /> MW-2, and MW-3) B4 was properly abandoned with a grout slurry to EHD specifications Pilot
<br /> borings MW-1, MW-2, and MW-3 were completed as ground water monitoring wells of the same
<br /> I designations using 2-inch diameter PVC casing with 0 020-inch slotted screen installed from
<br /> approximately 14 feet to 34 feet bsg The filter pack (No 2/12 Lonestar sand) was installed from
<br /> approximately 12 feet to 34 feet bsg,and a nominal 2-foot bentonite chip plug was installed above
<br /> the filter pack and hydrated The wells were grouted to near the surface with portland cement, and
<br /> water-tight, traffic-rated well boxes were installed over the wells
<br /> A total of 13 soil samples were analyzed for TPH-g, TPH-d, BTEX, five fuel additives, lead
<br /> 10 scavengers,and total lead TPH-g was detected in soil samples collected from bonngs B4 and MW-2
<br /> at concentrations of 12 milligrams per kilogram (mg/kg) (B4-25) and 1 8 mg/kg (MW2-35)
<br /> Benzene, toluene, ethylbenzene, and total xylenes were detected in soil samples collected from
<br /> borings B4 and MW-2 at maximum concentrations of 0 044 mg/kg (MW2-35), 0 27 mg/kg
<br /> (MW2-35), 0 15 mg/kg(B4-25),and 0 35 mg/kg(MW2-35),respectively Total lead was detected
<br /> in all samples analyzed from borings MW-1 through MW-3 at concentrations ranging from 6 3 mg/kg
<br /> (MW2-35)to 15 mg/kg(MW 1-35), total lead was not detected above the laboratory detection level
<br />' or 5 0 mg/kg in the samples analyzed from B4 No additional analytes were detected at or above
<br /> laboratory reporting linuts
<br /> I One grab ground water sample (B4-H20) was taken from boring B4 at an approximate depth of
<br /> 53 feet bsg and was analyzed for TPH-g, TPH-d, BTEX, five fuel additives, and lead scavengers
<br /> TPH-g and TPH-d were detected at concentrations of 14,000 µg/1 and 11,000 µg/1, respectively
<br />' Benzene, toluene, ethylbenzene, and total xylenes were detected at concentrations of 11 gg/l,
<br /> 260 µg/1, 430 µg/1 and 2,650 µg/1, respectively The lead scavenger 1,2-DCA was detected in the
<br /> ground water sample at a concentration of 2 2 µg/1 No additional analytes were detected at or above
<br /> laboratory reporting lxmrts
<br /> SENSITIVE RECEPTOR SURVEY
<br /> . On 10 April 2004, an AGE representative reviewed well dnller's reports from the California
<br /> Advanced GeoEnviro==tal,Inc
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