Deviation from the procedures specified in this Ordinance shall be permitted if:
a.
immediate measures for the protection of the environment are necessary;
b.
the need for monitoring or remediation can be assessed, or the required measures determined, on the basis of existing information;
c.
a polluted site is modified by the construction or alteration of a building or installation;
d.
voluntary measures by those directly concerned have an equivalent effect to those specified in the Ordinance.