If a proponent indicates the proposal has previously complied with environmental review procedures, then documentation of this review must be provided. For those proposals modified since the draft or final EIS was issued or not explicitly covered in the prior environmental review, an environmental checklist must be submitted that references earlier environmental documents where appropriate. Alternatively, a copy of, or reference to, the prior environmental document with a cover letter identifying any changes or revisions may be submitted. In the latter case, a new environmental checklist may be required, and in either case, other additional information may be required at the option of the environmental coordinator. The environmental coordinator shall determine whether a new threshold determination is required and whether existing environmental documents are adequate for the current proposal using the criteria of WAC 197-11-600. (Ord. 3404 § 15, 1984.)