1. A remedial investigation work plan shall provide for the investigation and characterization of the nature and extent of the contamination within the boundaries of the brownfield site; provided, however, a participant shall also be required to fully investigate and characterize the nature and extent of contamination emanating from such site; and a volunteer must perform a qualitative exposure assessment pursuant to subdivision two of section 27-1415 of this title regarding contamination emanating from such site. Such work plan shall require that the applicant cause a final report to be prepared and submitted to the department that identifies the investigation activities completed pursuant to such work plan. Such final report, at a minimum, shall:

1. (a) Fully characterize the nature and extent of contamination at the brownfield site; a participant shall also fully characterize the nature and extent of contamination that has emanated from the brownfield site; and a volunteer shall describe the findings of the off-site exposure assessments;
2. (b) State whether the completed investigation has demonstrated that conditions at the brownfield site (1) require remediation in order to meet the remedial requirements of this title; or (2) meet the requirements of this title without necessity for remediation;
3. (c) Within twenty days of the completion of the final report the department shall make a final determination regarding whether the site poses a significant threat based on criteria promulgated pursuant to title thirteen of this article; and
4. (d) For it to be determined that the requirements of this title have been met without the necessity for remediation, an alternatives analysis pursuant to section 27-1413 of this title must support such determination for all sites which do not meet the requirements in Track 1 for unrestricted use and the department must have made a final determination that the site does not pose a significant threat.

4. The commissioner shall use all best efforts to expeditiously approve, modify, or reject a proposed work plan within forty-five days from its receipt or within fifteen days of the close of the comment period, whichever is later.

1. (a) If the commissioner rejects a proposed work plan, the commissioner shall notify the applicant and specify the reasons for rejecting same.
2. (b) If the commissioner approves or modifies such proposed work plan, the commissioner shall notify the applicant, in writing, that the proposed work plan has been approved or modified. If the commissioner requires a modification, the applicant may agree to modify such proposed work plan or withdraw it from consideration.