EPA alleges Respondent is or was the owner or operator within the meaning of Section 311(a)(6) of the Act, 33 U.S.C. Subsection 1321(a)(6), of a tanker truck that was carrying asphalt emulsion on Alpine Road in San Mateo County, California on September 30, 2019 when it overturned into a tributary of Alpine Creek. The tanker truck was damaged and released asphalt emulsion into the tributary of Alpine creek.