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Site Background Information Former Ocampo Property
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<br /> addendum prepared by AGE for the site in 1999, to advance four soil borings and install three
<br /> tground water monitoring wells The revised addendum was approved by the San Joaquin County
<br /> Environmental Health Department (EHD)by correspondence dated 19 May 1999
<br /> On 17 October 2002, three soil probe borings (B1 through B3)were advanced at the site as part of
<br /> site assessment activities A total of three soil samples were submitted to McCampbell Analytical,
<br /> Inc(MAI),a State of California Department of Health Services(DHS)-certified analytical laboratory,
<br /> for analysis Petroleum hydrocarbons and volatile organic compounds were not detected in any of
<br /> the samples analyzed Laboratory results of selected soil samples detected barium and chromium in
<br /> soil samples collected from borings B1,B2, and B3 at maximum concentrations of 120 milligrams
<br /> per kilogram(mg/kg)(B2-10)and 27 mg/kg(B 1-1 0),respectively Lead was detected in soil samples
<br /> collected from borings B 1 and B2 at a maximum concentration of 6 7 mg/kg(B 1-10) Arsenic was
<br /> detected in soil samples collected from borings B 1 and B3 at a maximum concentration of 3 4 mg/kg
<br /> (B3-10)
<br /> ' On 17 October 2002, soil boring B4 was advanced at the site and the data was held for future
<br /> reporting On 17 and 18 February 2004, B5 and B6 were advanced for the collection and analysis
<br /> of soil and`grab' groundwater samples The probe borings B4,B5,and B6 were advanced to depths
<br /> ' of 47 feet, 54 feet, and 57 feet bsg, respectively
<br /> TPH-g was detected in all soil samples collected from B5 and one sample from B4 Concentrations
<br /> ' ranged from 2 2 milligrams per kilogram (mg/kg) in sample B4-35 to 16,000 mg/kg in sample
<br /> B5-33 The most significant concentrations of hydrocarbons in soil in boring B5, located at the
<br /> ' former UST area,were at depths greater than 30 feet bsg and concentrations are elevated in samples
<br /> to the total depth of the boring TPH-d was detected in the samples collected from B5, at
<br /> concentrations ranging from 640 mg/kg to 11,000 mg/kg However,the MAI laboratory report notes
<br /> the diesel concentrations are typical of aged or `weathered' gasoline patterns One or more BTEX
<br /> compounds were detected in the following soil samples,B4-35,B6-45,B6-55,and all samples from
<br /> B5,at the following maximum concentrations 50 mg/kg benzene(B5-33), 1,800 mg/kg toluene(B5-
<br /> 18), 2,100 mg/kg ethylbenzene (B5-18) and 3,690 mg/kg total xylenes (B5-18) 1,2-DCA was
<br /> detected in the soil sample B5-13 at a concentration of 1 9 mg/kg
<br /> TPH-g was detected in all three ground water samples at the following concentrations 1,200
<br /> micrograms per liter(µg/l)(B4), 460,000,000 µg/l (B5)and 12,000 µg/1 (B6) TPH-d was detected
<br /> in the samples from B4 and B5 at concentrations of 160 µgll and 14,000,000 µg/l, respectively
<br /> ' BTEX compounds were detected in all three ground water samples analyzed The sample from B5
<br /> had the highest concentrations at 680,000 µg/1 benzene, 1,500,000 µg/1 toluene, 420,000 ggll
<br /> ethylbenzene and 3,280,000 µg/l total xylenes MTBE and lead were detected in the ground water
<br /> ' sample from B4 at 4 6 µg/1 and 480 pg/l, respectively
<br /> Advanced GeoEnvironmental,Inc
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