What constitutes substantial evidence in a motion to overturn a decision by the California Department of Environment?

**624 "Substantial evidence is defined as 'enough relevant information and reasonable inferences from this information that a fair argument can be made to support a conclusion, even though other conclusions might also be reached.' [Citations.]" ( Association of Irritated Residents v. County of Madera (2003) 107 Cal.App.4th 1383, 1391, 133 Cal.Rptr.2d 718.) The court indulges all reasonable inferences from the evidence that would support the agency's determinations. ( Western States, supra, 9 Cal.4th at p. 571, 38 Cal.Rptr.2d 139, 888 P.2d 1268.) " 'A court may not set aside an agency's [decision] on the ground that an opposite conclusion would have been equally or more reasonable. [Citation.] A court's task is not to weigh conflicting evidence and determine who has the better argument.... We have neither the resources nor scientific expertise to engage in such analysis, even if the statutorily prescribed standard of review permitted us to do so.' " ( Id. at pp. 573-574, 38 Cal.Rptr.2d 139, 888 P.2d 1268.)