00388PROVIDED, HOWEVER, That if the public sewer utility's require-
ments are leis, restrictive, subsections (1) and (2) of this
section shall apply.
WAC 248-96-070 ON -SITE SYSTE14 MANAGEMENT. (1) When sub-
divisions or multiple housing units are designed to have gross
densities that exceed 3.5 housing units or 12 people/acre or
disposal
waste flows of 1,200 gallons/acre/day, on -site sewage
systems shall not be permitted unless the perpetual maintenance
and management of the sewage disposal systems are under the
identified
responsibility of an approved management system'as
in subsections (2) and (3) of this section.
(2) Proposed on -site sewage disposal systems to be located
within the boundary of an operating public sewer utility shall
be approved by the sewer utility prior to the issuance of a
permit. If the proposed°system serves a density greater than
that identified in subsection (1) of this section, the mainten-
ance of the sewage disposal system shall be the responsibility
shall be provided as approved
of the sewer utility or dry sewers
by the department of ecology and applicable public sewer utility
having jurisdiction in accordance with an approved sewage drainage
basin plan.
(3) sewage disposal systems serving housing densities
and/or flows exceeding that identified in subsection (1) of this
section and not located within.the boundary of an operating
public sewer utility, shall have an approved perpetual mainten-
ance and management system as established under the guidelines
developed by the secretary, the department of ecology., and the
local government responsible for public utilities. The guide-
lines shall take into account the comprehensive land -use plan
for the jurisdictional area and size of development.
(4) Within six months after the effective date of these
regulations, the secretary shall develop guidelines describing
an approved on -site waste management system.
WAC 248-96-075 LARGER SYSTEMS. Guidelines governing the
review, approval procedure and authority for larger systems
shall be.developed jointly between the department of social.and
health services, the local health departments, the department
of ecology, and municipal sewer utilities. However, until such
guidelines are established, the following rule shall apply:
In all cases where the maximum design flow of any on -site
disposal system is greater than 14,500 gallons per day, prior
to instituting construction of the system, a copy of the con-
struction plan shall be submitted to the secretary, who shall
review the proposed system to determine that its use will be
consistent with protection of the public health. No health
officer shall issue a permit for such a system until it has
been approved by the secretary.
WAC 248-96-080 PERMIT. (1) No person shall install a
4 H new on -site sewage disposal system, nor perform major altera-
tions, extensions or relocations of an existing system without
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