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Limited Site Investigation <br /> Corral Hollow sho in center,Tracy,California <br /> Discussion <br /> The analytical results were compared with San Francisco Bay Regional Water Quality Control Board <br /> (SFBRWQCB) Environmental Screening Levels(ESLs)and with EPA Region 9 Regional Screening <br /> Levels (RSLs). For comparison purposes,the following screening levels were used: <br /> commercial/industrial ESLs for shallow soil where groundwater is a current or potential source of <br /> drinking water, RSLs for industrial soil,and RSLs for protection of groundwater.The screening levels <br /> are listed at the bottom of Table 1.The analytical results were all below the screening criteria with <br /> the exception of benzo(a)pyrene in sample SB-7-1-1.5 detected at a concentration of 5.5 ug/kg, <br /> which exceeded the risk-based RSL for protection of groundwater(3.5 ug/kg). <br /> Based on the analytical results and background documents provided to Terraphase, no additional <br /> assessment is warranted at this time. <br /> If you have any questions or comments, please feel free to contact William Carson by phone(510- <br /> 388-8745)or e-mail(will iam.carson@terraphase.com). <br /> For Terraphase Engineering Inc. <br /> William Carson, PE (C60735) Lauren Vigliotti, PG(No 8775) <br /> Principal Engineer Professional Geologist <br /> Attachments: Table 1—Analytical Results <br /> Figure 1—Site Location Map <br /> Figure 2—Sample Location Map <br /> Laboratory Reports <br /> Terraphase Engineering Inc. Page 4 of 5 <br />