In the event of a hazardous material release into or on any land, water or air within the city, responsibility for scene management shall be the most appropriate agency or responsible party as set forth in this chapter. The costs incurred by the city in cleaning up (mitigating) the effects of such a release shall be reimbursed by the person, firm or corporation found to be the responsible party for causing said release. Costs subject to reimbursement shall not include those of the city for emergency response. (Prior code § 4511)