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I r I rSite Background Information Lopez Property • Page 2 of 2 rI of removal Soil samples were collected and analyzed for gasoline, diesel, kerosene, motor oil, r benzene, toluene, ethylbenzene, xylene (BTEX) and lead, but a chain of custody was never submitted Although the analytical results showed non-detect for all analytes,the EHD did not close this case because of the missing chain of custody form and the discrepancy between the EHD robservations and the laboratory analytical results rPREVIOUS SITE ASSESSMENT ACTIVITIES An Unauthorized Release Report(UAR)was issued by the EHD In March 1994 to facilitate further r site assessment On 04 June 1996,one soil boring was advanced through the former tank excavation to a depth of 15 feet bsg However,the EHD was notified that the sample had been lost, and the site was resampled on 20 June 1996 at a depth of 16 feet bsg,the analytical results Indicated non-detect r for gasoline, BTEX and the fuel oxygenate MTBE The laboratory quality assurance procedures were questioned by the EHD and resolved in December 1996 The property was given a"no further action" letter and "closed"by the EHD In May 1997 ' During a Phase I investigation for potential property Ytransfer,a discrepancy was discovered between rsite maps prepared by EHD and a former consultant for the property owner On 20 August 2003, • AGE attempted to relocate the UST excavation Field personnel located what appeared to be brackets used to secure the former UST vent pipe to a building Based on this discovery and EHD ' inspection maps, a soil probe boring was advanced to a total depth of 30 feet bsg adjacent to the suspected vent pipe location to collect soil and groundwater samples Laboratory analysis of the soil samples detected total petroleum hydrocarbons quantified as gasoline (TPH-g) and BTEX ' compounds at maximum concentration 10,600 mg/kg TPH-g, 13 mg/kg benzene, 330 mg/kg toluene, 180 mg/kg ethylbenzene, and mg/kg total xylenes Laboratory analysis of the ground water sample reported 2,560,000 microgrois per liter(µg/1)TPH-g, 1,300 pg/l benzene,30,000 pg/l toluene, 37,000 µg/1 ethylbenzene and ,000 µg/l total xylenes MTBE was not detected In the r analyzed soil and ground water samples 5 �V 11 l r r r • rAdvanced GeoEnvironmental,Inc r