Thornton will engage one or more Consultants to provide on an on-call, as-needed basis, comprehensive environmental consulting Services across a variety of disciplines including, but not limited to, general environmental compliance consulting, industrial hygiene, natural resources, cultural resources, materials abatement, contaminant remediation, and pre-construction/development Services, and to provide remediation, abatement, and or demolition Services, either through use of in-house forces or engagement of subcontractors. These Services may be required for routine scheduled projects or on an expedited or emergency basis. Consultant shall perform the Services in accordance with a specific Task Assignment Scope of Services (SOS) authorized by Thornton by issuance of a Purchase Order. Refer to the attached Exhibit 2 Agreement for Professional Consulting Services (On Call), Exhibit A Consultant’s General Scope of Services for more detailed information on the Services which may be required. Thornton intends to award to multiple firms to assure all areas of expertise are covered.