HUNTINGTON BEACH, Calif.—A pipeline operated by a California-based firm has been identified as the source of an oil sheen spotted off Bolsa Chica State Beach that appeared to be heading north toward the Long Beach area. “A responsible party has been identified as DCOR LLC,” the California Department of Fish and Wildlife’s Spill Prevention & Response tweeted Dec. 25. “The sheen was observed in vicinity of their pipeline, [Pipeline 0919], which runs from Platform Eva.” DCOR is an oil and gas producer based in Oxnard. All platform and pipeline operations in the vicinity of the DCOR pipeline have ceased, and officials are watching for “any indications of additional discharge of oil,” state officials said. It remained a priority to identify and isolate the source of the sheen, the agency continued. “Divers will go down [on Dec. 28] to inspect the line once inclement weather improves. In the meantime, crews continue to monitor for add’l sheen & the line has …