01.
Facility
Plans Required. All new municipal wastewater treatment or disposal
facilities, and all existing municipal wastewater treatment or disposal
facilities undergoing material modification or expansion, are required to have
a current facility plan that shall address all applicable issues specifically
required in Sections 410 and
420 through
599 of these rules including, but
not limited to, hydraulic capacity, treatment capacity, project financing, and
operation and maintenance considerations. The facility plan shall address these
issues sufficiently to determine the effects of the project on the overall
wastewater infrastructure. Material modification or expansion that requires a
facility plan includes upgraded, or rehabilitated municipal wastewater
treatment or disposal facilities and major collection, interceptor sewer, pump
station projects, and septage transfer station projects. Facility plans must
address the entire potential service area of the project. A facility plan may
be completed for collection systems only. If such a collection system facility
plan is prepared, and flows increase in excess of the design capacity of
downstream collection and treatment facilities, the impact of the flow shall be
addressed in the facility plan. (3-31-22)
a.
Department-reviewed simple wastewater main extension projects. A facility plan
is not required if the Department is provided documentation supporting the
ability of the wastewater system to provide service for the simple wastewater
main extension without adding wastewater pumping stations or treatment capacity
to the system and without overloading the existing collection system.
Documentation may be in the form of: (3-31-22)
i. Hydraulic modeling; (3-31-22)
ii. Usage data and flow calculations;
(3-31-22)
iii. Declining balance
reports that demonstrate the system has the capacity to supply the service area
of the system served by the extension; or (3-31-22)
iv. Other documentation acceptable to the
Department. (3-31-22)
b.
QLPE-Reviewed Simple Wastewater Main Extension Projects. A Department-approved
facility plan is not required to be in place prior to the QLPE approving simple
wastewater main extensions pursuant to Subsection
400.03.b., provided that the
system is in compliance with the facility and design standards in the area
served by the extension. If the Department has not approved a facility plan
which covers the proposed simple wastewater main extension, then the system
owner or the QLPE must include with the transmittal letter documentation
supporting the ability of the system owner to provide service for the simple
wastewater main extension without adding wastewater pumping stations or
treatment capacity to the system and without overloading the existing
collection system. The system owner shall provide this documentation to the
QLPE as necessary. Documentation may be in the form of: (3-31-22)
i. Hydraulic modeling; (3-31-22)
ii. Usage data and flow calculations;
(3-31-22)
iii. Declining balance
reports that demonstrate the system has the capacity to supply the service area
of the system served by the extension; or (3-31-22)
iv. Other documentation acceptable to the
Department. (3-31-22)
02.
Submittal to Department.
Facility plans shall be submitted to the Department for review and approval
prior to the submission of plans and specifications for a project related to
the facility plan. (3-31-22)
03.
Engineer's Seal Required. Facility plans submitted to the
Department shall bear the imprint of an Idaho licensed professional engineer's
seal that is both signed and dated by the engineer. (3-31-22)
04.
Facility Plan Contents. The
facility plan shall assemble basic information, present criteria and
assumptions, and examine alternative solutions with preliminary layouts and
cost estimates. The facility plan is intended to address system wide growth, to
identify system deficiencies, and to lay out a plan for system upgrades and
expansion. The minimum requirements for a facility plan are located in
Subsections 410.04.a. through 410.04.c. If
specific items are not applicable to a particular facility plan, then the
engineer shall state this in the facility plan and state the reason why it is
not applicable. (3-31-22)
a. New Wastewater
System Facility Plan. The facility plan for a new wastewater system must
include sufficient detail to support the requirements of Sections
410 through
520 and address the items listed in
Subsections 410.04.a.i. through
410.04.a.vii. of this rule. (3-31-22)
i.
Location. Provide a general description and location of the system including
service boundaries. (3-31-22)
ii.
Population. Provide the estimated design population of the system.
(3-31-22)
iii. Wastewater flows.
Provide design data for domestic, commercial, and industrial wastewater
generation, including average day, maximum day, maximum month, or peak hour
flows. (3-31-22)
iv. Collection.
Identify and describe any anticipated or proposed wastewater collection
systems. Include specific detail on any anticipated or proposed wastewater
pumping stations and on any anticipated or proposed wastewater interceptor or
trunk lines. (3-31-22)
v.
Treatment. Identify and describe any anticipated or proposed treatment works.
Provide specific detail on the type and level of treatment and the required
capacity of the treatment system. (3-31-22)
vi. Disposal. Identify and describe any
anticipated or proposed wastewater disposal system(s). Include specific
information on the location and method of disposal and information on any
existing disposal permits or estimated timelines to obtain anticipated required
permits. (3-31-22)
vii. Drinking
water. Describe the drinking water distribution system with reference to the
relationship to existing or proposed wastewater structures which may affect the
operation and location of the wastewater system. (3-31-22)
b. Existing Wastewater System Facility Plan.
The facility plan for an existing wastewater system must include sufficient
detail to support the requirements of Sections
410 through
520, address all items in
Subsections 410.04.a.i. through
410.04.a.vii., and address all items in Subsections
410.04.b.i. through
410.04.b.viii. (3-31-22)
i. Provide a
hydraulic analysis of the collection system if requested by the Department. Any
analysis of an existing collection system shall be properly calibrated. The
type and sophistication of the analysis shall be dependent on the type of the
system. (3-31-22)
ii. Identify and
evaluate problems or deficiencies related to the wastewater system.
(3-31-22)
iii. Identify the design
capacity of existing facilities and the current operating flows.
(3-31-22)
iv. Describe financing
options for projects identified in the facility plan. (3-31-22)
v. Set forth anticipated charges for users.
(3-31-22)
vi. Review organizational
and staffing requirements. (3-31-22)
vii. Offer a project(s) recommendation for
client consideration. (3-31-22)
viii. Outline official actions and procedures
to implement the project. (3-31-22)
c. Wastewater System Facility Plan Funded by
the State Revolving Fund. If the project is funded by the state revolving fund
or a state grant, the facility plan must meet the requirements of Subsections
410.04.a. and 410.04.b., and
other requirements that may also apply. See IDAPA 58.01.12 "Rules for
Administration of Water Pollution Control Loans," and IDAPA 58.01.04, "Rules
for Administration of Wastewater Treatment Facility Grants."
(3-31-22)
d. Facility Plan
Guidance. A checklist which can be used for guidance can be found on the DEQ
website at
http://www.deq.idaho.gov. This checklist
is for Department grant and loan projects, but may be used in part or in whole
as a guide to assist in the development of any facility plan.
(3-31-22)
