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Additional Site Assessment Report and Human Health Risk Screening Evaluation <br />www.arcadis.com <br /> ii <br />Acronyms and Abbreviations <br />µg/m3 microgram per cubic meter <br />Arcadis Arcadis U.S., Inc. <br />ASTM ASTM International <br />bgs below ground surface <br />BTEX benzene, toluene, ethylbenzene, and total xylenes <br />Cal/EPA California Environmental Protection Agency <br />CEMC Chevron Environmental Management Company <br />COPC Constituent of Potential Concern <br />CVRWQCB Central Valley Regional Water Quality Control Board <br />DTSC Department of Toxic Substances Control <br />DWR California Department of Water Resources <br />ESL environmental screening level <br />HHRE human health risk screening evaluation <br />HI hazard index <br />IDW investigation-derived waste <br />Leidos Leidos Engineering, LLC <br />LTCP Low-Threat Underground Storage Tank Case Closure Policy <br />mg/kg milligram per kilogram <br />mL milliliter <br />OVP Old Valley Pipeline <br />PID photo ionization detector <br />QC quality control <br />Report Additional Site Assessment Report and Human Health Risk Screening Evaluation <br />ROW right of way <br />SAIC Science Applications International Corporation <br />SFBRWQCB San Franciso Bay Regional Water Quality Control Board <br />Site former Tidewater Associated Oil Company/Old Valley Pipeline right of way, near the <br />Surland Homes residential development, located Lowell Road in Tracy, California <br />SWRCB State Water Resources Control Board <br />TAOC Tidewater Associated Oil Company