Laserfiche WebLink
1 <br /> 10 Site Background Information Lopez Property <br /> Page 2 of 2 <br /> 1 <br /> of removal Soil samples were collected and analyzed for gasoline, diesel, kerosene, motor oil, <br />' benzene, toluene, ethylbenzene, xylene (BTEX) and lead, but a chain of custody was never <br /> submitted Although the analytical results showed non-detect for all analytes,the EHD did not close <br /> this case because of the missing chain of custody form and the discrepancy between the EHD <br /> observations and the laboratory analytical results <br /> PREVIOUS SITE ASSESSMENT ACTIVITIES <br /> An Unauthorized Release Report(UAR)was issued by the EHD in March 1994 to facilitate further <br />' site assessment On 04 June 1996,one soil boring was advanced through the former tank excavation <br /> to a depth of 15 feet bsg However,the EHD was notified that the sample had been lost,and the site <br /> was resampled on 20 June 1996 at a depth of 16 feet bsg, the analytical results indicated non-detect <br /> for gasoline,BTEX and the fuel oxygenate MTBE The laboratory quality assurance procedures were <br /> questioned by the EHD and resolved in December 1996 The property was given a "no further <br />' action" letter and"closed"by the EHD in May 1997 <br /> During a Phase I investigation for potential property transfer,a discrepancy was discovered between <br />' site maps prepared by EHD and a former consultant for the property owner On 20 August 2003, <br /> AGE attempted to relocate the UST excavation Field personnel located what appeared to be brackets <br /> used to secure the former UST vent pipe to a building Based on this discovery and EHD inspection <br />' maps,a soil probe boring was advanced to a total depth of 30 feet bsg adjacent to the suspected vent <br /> pipe location to collect soil and ground water samples Laboratory analysis of the soil samples <br /> detected total petroleum hydrocarbons quantified as gasoline (TPH-g) and BTEX compounds at <br />' maximum concentrations of 10,600 mg/kg TPH-g, 13 mg/kg benzene, 330 mg/kg toluene, <br /> 180 mg/kg ethylbenzene, and 650 mg/kg total xylenes Laboratory analysis of the ground water <br /> sample reported 2,560,000 micrograms per liter (µg/l) TPH-g, 1,300 µg/1 benzene, 30,000 µg11 <br /> t toluene, 37,000 µg/1 ethylbenzene and 217,000 µg/1 total xylenes MTBE was not detected in the <br /> analyzed soil and ground water samples <br /> 1 r <br /> 1 � <br /> 1 ' <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />