ARCHIVED REPORTS ADDITIONAL SOIL SAMPLING AND ANALYSES

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' k" KLEINFELDER ' The three excavations are identified as Shallow Excavation A (SE-A), Small Excavation B (SE- B) and Large Excavation C (LE-Q. See Plate 2 for locations. The primary contaminants were ' both purgeable and extractable hydrocarbons, but primarily extractable hydrocarbons. The following is brief summary of Kleinfelder's findings and recommendations from the initial report. Please refer to Kleinfelder's initial report for additional details. • No additional mitigation or sampling is recommended for Excavation SE-A ' . The majority of petroleum affected soil was removed from SE-B, however a portion of affected soil was left in place at the western boundary fence. Contaminated soil may be located offsite. 1 . The bulk of contaminated soil appears to have been removed from Excavation LE-C. However field observation and/or analytical soil sampling results indicate that contaminated ' soils still exist along the northern sidewall and part of the eastern sidewall. Kleinfelder recommends excavation and removal of this soil with subsequent confirmation soil sampling. ' • Groundwater flow and gradient was estimated towards the northeast at a gradient of 0.0028 ft./ft. ' • Groundwater sampling results were none detect for all requested analytes (See Section 5.1.4 of former report), with the exception of xylenes detected in a single water sample at a ' concentration of 0.75 µg/1. This groundwater sample was collected from a well located cross-gradient of SE-B and LE-C and downgradient of a former tank area operated previously by R&B Trucking Company. Groundwater sampling results appear to indicate ' that contaminated soil from SE-B and LE-C have not adversely affected groundwater. The following activities were conducted for the purpose of removing the remaining discolored ' soil from Excavation LEC and to collect and analyze confirmation soil samples. In addition contaminated stockpiled soil was to be removed and transported to a local landfill. While removing the stockpiled soil additional discolored soil with petroleum odor was noted in Area SE-D. This area was also excavated with collection and analyses of confirmations soil samples. The following details Kleinfelder's findings from this additional work. ' FIELD ACTIVITIES On August 14, 15 and 16 additional excavation activities were conducted by RAH Environmental of Loomis, California at the subject site. Mr. Phillip Marquez for Kleinfelder was present during this time. Approximately 1,400 yards of soil was excavated, 1,000 yards of soil from the former excavation LE-C and about 400 yards of soil from excavation SE-D. Kleinfelder collected a total ' of 14 soil samples, eight from sidewall samples from LE-C and six from sidewall and bottom samples from SE-D. LE-C is beneath and near the former R&B Trucking maintenance shop. Excavation SE-D was located south of LE-C and in proximity to a former excavation of six diesel underground storage tanks (USTs). Each of the soil samples was analyzed for purgeable and extractable petroleum constituents including benzene, toluene, ethylbenzene and xylenes (BTEX). ' 20-4341-1 LEO 1/2011 L635 Page 2 of 8 Copyright 2001 Kleinfelder,Inc. September 24,2001