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07 June 2004 <br /> AGE-NC Prod cot No 02-0926 <br /> ' Page 2ofI1 <br /> ' 2 2 UNDERGROUND STORAGE TANK REMOVAL <br /> It is AGE's understanding that a single 550-gallon underground storage tank (UST) was removed <br /> ' from the site by Kleinfelder&Associates on December 18, 1985 A soil sample collected from under <br /> the UST after removal Indicated that high concentrations of lead were present in the soil <br /> 23 PREVIOUS SITE INVESTIGATIONS <br /> ' A soil boring was advanced at the site on November 25, 1998 by Upgradient Environmental <br /> Consultants, petroleum hydrocarbons were detected in soil samples collected from the boring <br /> Analytical results of the samples are Included in Table 1 Due to the detection of contamination, a <br /> 1 <br /> workplan addendum was prepared byUpgradient Environmental Consultants and revised addendum <br /> prepared by AGE for the site in 1999, to advance four soil borings and install three ground water <br /> monitoring wells The revised addendum was approved by the San Joaquin County Environmental <br /> ' Health Department (EHD) by correspondence dated 19 May 1999 <br /> • On 17 October 2002, three soil probe borings(B 1 through B3)were advanced at the site as part of <br /> ' the site assessment A total of three soil samples were submitted to MAI for analysis as noted above <br /> Petroleum hydrocarbons and volatile organic compounds were not detected in any of the samples <br /> ' analyzed <br /> Laboratory results of selected soil samples detected barium and chromium in'soil samples collected <br /> from borings B1, B2 and B3 at maximum concentrations of 120 milligrams per kilogram(mg/kg) <br /> (132-10) and 27 mg/kg (B1-10), respectively Lead was detected in soil samples collected from <br /> borings B 1 and B2 at a maximum concentration of 6 7 mg/kg(B 1-10) Arsenic was detected in soil <br /> samples collected from borings Bl and B3 at a maximum concentration of 3 4 mg/kg (B3-10) <br /> Results are summarized in Table 1 <br /> 3.4. PROCEDURES <br /> ' Field work was performed as outlined in the Revised Work Plan Addendum dated 18 July 2002 and <br /> by the approval letter dated 23 July 2002 and in accordance with guidelines established by the <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of <br /> ' underground storage tank (UST) sites <br /> ' Advanced GeoEnvironmentO,Inc <br />