Deadlines for the Township to take action on a preliminary or final plat, as specified in the Land Division Act and reiterated in this chapter, may be extended by mutual written consent of the proprietor and the Township. A waiver of the review deadlines may be required to permit concurrent processing of related review applications (i.e., PUD, HPUD or open space community). In the absence of written consent for such a waiver, denial of a plat shall be considered appropriate if the Township has not been given sufficient time within the deadline to evaluate the impact of a proposed plat on the public health, safety and welfare, pursuant to the regulations in this chapter.