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SummerHill Apartment Communities 10391.000.000 <br /> Rollins Road-Carolan Avenue, Burlingame November 19, 2014, Revised January 14, 2015 <br /> 5.4 BTEX <br /> Similar to TPH as gasoline, BTEX concentrations around the former UST area will be compared <br /> to the RWQCB's ESL1 for residential soils of benzene (0.044 mg/kg), toluene (2.9 mg/kg), <br /> ethyl-benzene (3.3 mg/kg), and xylenes (2.3 mg/kg). Any soil encountered during <br /> demolition/construction exhibiting BTEX concentrations exceeding ESLs will be excavated and <br /> property disposed. <br /> Table 5.4-1 <br /> Remedial Action Objectives(RAOs) <br /> COPC Basis fori i Level Soil Cleanup Level <br /> TPH-Diesel Residential ESL 100 mg/kg <br /> TPH-Motor Oil Residential ESL 100 mg/kg <br /> TPH-Gasoline Residential ESL 100 mg/kg <br /> Benzene Residential ESL 0.044 mg/kg <br /> Toluene Residential ESL 2.9 mg/kg <br /> Ethylbenzene Residential ESL 3.3 mg/kg <br /> Xylenes Residential ESL 2.3 mg/kg <br /> 6.0 DEMOLITION AND EXCAVATION ACTIVITIES <br /> ENGEO will provide full-time observation services during demolition and grading activities. <br /> Soils encountered across the entire Property will be observed for discoloration/staining or <br /> olfactory evidence of contaminant impacts, with particular attention given to the location of <br /> identified soil impacts. In the event unforeseen environmental conditions, such as those listed <br /> above, are encountered during demolition and pre-grading work, the Site Soil Management Plan <br /> will be implemented. <br /> 7.0 POST-DEMOLITION SOIL CHARACTERIZATION <br /> The current building layout across the Site has limited the soil sampling coverage of the near <br /> surface soil particularly in the area of the planned excavation for the underground parking <br /> structure. Additional sampling and laboratory testing is recommended in the area beneath the <br /> existing structures after building demolition to characterize the soil for excavation, removal, <br /> off-site transport and disposal. It appears that most of the soil at the Site may be characterized for <br /> Class III disposal, while the soil with elevated TPH can be excavated separately for Class II <br /> disposal. <br /> ' SFRWQCB ESLs,2013: Summary Table A—Shallow Soils, Groundwater is Current of Potential Drinking Water <br /> Source, <br /> -5- E&GEO <br /> Expect Excellence <br />