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i Ii Site Background Information Lopez Property Page 2 of 2 of removal Soil samples were collected and analyzed for gasoline, diesel, kerosene, motor oil, 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 betwcen the EHD observations and the laboratory analytical results IPREVIOUS SITE ASSESSMENT ACTIVITIES An Unauthorized Release Report(UAR) was issued by the EHD in March 1994 to facilitate further 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 Iost, and the site was resampled on 20 June 1996 at a depth of 16 feet bsg, the analytical results indicated non-detect 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 transfer,a discrepancy was discovered between site 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 ground water samples Laboratory analysis of the soil samples detected total petroleum hydrocarbons quantified as gasoline (TPH-g) and BTEX compounds at maximum concentrations of 1000 mg/kg TPH-g, 13 mg/kg benzene, 330 mg/kg toluene, 180 mg/kg ethylbenzene, andmg/kg total xylenes Laboratory analysis of the ground water sample reported 2,560,000 micrograms pgr liter (µg/1) TPH-g, 1,300 µg/1 benzene, 30,000 gg/1 I toluene, 37,000 ltg/l ethylbenzene and W,000 µg/1 total xylenes MTBE was not detected in the analyzed soil and ground water samples v�1 /.1 s Advanced GeoEnvironmentai,Inc