See the definition of Preliminary Engineering Report in Section
003. Preliminary engineering
reports are required for all new water systems or material modifications to
existing water systems that require plan and specification review and approval
pursuant to Subsection
504.03. The preliminary
engineering report shall be in conformance with the approved facility plan or
shall describe any modifications to the facility plan. Preliminary engineering
reports must be completed for all major water system projects including, but
not limited to, source, pump station, pressure control, storage, and treatment
projects. Preliminary engineering reports are not required for simple water
main extensions that are approved in accordance with Subsections
502.01.a. or 502.01.b.
(3-24-22)
01.
Submittal to
Reviewing Authority. Preliminary engineering reports shall be submitted
to the Department for review and must be approved by the Department prior to
the submission of plans and specifications. The Department may allow well
construction plans and specifications to be submitted concurrently with a
preliminary engineering report for these projects. (3-24-22)
02.
Seal Required. Preliminary
engineering reports 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. The Department will accept the seal and signature of an Idaho
licensed professional geologist on preliminary reports for well source, spring
source, or infiltration gallery site reports, and for well construction.
(3-24-22)
03.
Preliminary
Engineering Report Contents. The preliminary engineering report must
include sufficient detail to demonstrate that the proposed project meets
applicable criteria. The items included in Subsections
503.03.a. through 503.03.e.,
and all applicable issues and items specifically required in Sections
500 through
552, shall be addressed in detail.
As required, a preliminary engineering report shall also identify and evaluate
drinking water related problems, assemble basic information, present criteria
and assumptions, examine alternative solutions with preliminary layouts and
cost estimates, offer a conclusion with a proposed project, and outline
official actions and procedures to implement the project. If specific items in
Subsections 503.03.a. through 503.03.e.
are not applicable to a particular design, then the designer shall state this
in the preliminary engineering report and state the reason why it is not
applicable. Items adequately addressed in the facility plan under which the
project is being designed may be addressed by reference for purposes of the
preliminary engineering report. (3-24-22)
a.
All preliminary engineering reports shall include items in Subsection
503.03.a. and the applicable
items from Subsections
503.03.b. through 503.03.e.
(3-24-22)
i. General information. The
preliminary engineering report general information shall include, but is not
limited to: (3-24-22)
(1) Project
description. A detailed description of the proposed project;
(3-24-22)
(2) Site selection. A
general description of the location of the project and justification of the
site selection; (3-24-22)
(3)
Access and utilities. A general discussion of adequacy of local roadways and
availability of power or other utilities; (3-24-22)
(4) Surrounding land use. A general
discussion of surrounding land use, including any potential sources of
contamination; and (3-24-22)
(5)
Security. A general discussion of planned security features such as fencing,
lighting, alarm systems, etc. (3-24-22)
ii. Coordination with facility plan. The
preliminary engineering report shall discuss or reference items provided in the
Department-approved facility plan. These items include, but are not limited to:
(3-24-22)
(1) Existing System. A general
description of the existing system and how the project fits into the overall
system and facility plan; (3-24-22)
(2) Size. The estimated system size based on
number of persons, number of connections, or number of EDUs served or impacted
by the project; (3-24-22)
(3) Water
Quantity. Design data for domestic, irrigation, fire fighting, commercial and
industrial water uses, including peak hour, maximum day, and average day
demands; (3-24-22)
(4) Storage. How
the project will affect various storage requirements. See definition of
Components of Finished Water Storage in Section
003; (3-24-22)
(5) Operating Pressure. Pressure ranges for
all flow conditions prescribed by these rules; (3-24-22)
(6) Hydraulic Analysis. A computer analysis
of the hydraulics of the distribution system if requested by the Department;
any analysis of an existing distribution system shall be properly calibrated.
The type and sophistication of analysis shall be dependent on the type of
system; (3-24-22)
(7) Sources of
Water. A general discussion of the adequacy, quality and availability of source
of water. A water system that is to be served by a separate non-potable
irrigation system must provide documentation to demonstrate the actual
availability of water in sufficient quantity to ensure that the irrigation
system will not compete with or in any way diminish the source of water for the
potable water system; (3-24-22)
(8)
Sewage. Describe the sewage collection system and sewage treatment works, with
special reference to their relationship to existing or proposed water works
structures which may affect the operation of the water supply system, or which
may affect the quality of the supply; (3-24-22)
(9) Treatment wastes. Assesses and
characterize all anticipated waste discharges generated by the project and any
activities that could impact the water supply. The location of each waste
handling area or discharge point shall be shown on a scale map;
(3-24-22)
(10) Financing methods.
Provide brief discussion of financing options investigated or planned; and
(3-24-22)
(11) Flooding. Discuss
mechanisms for protection of the system from flooding.
(3-24-22)
iii. Code
provisions. The preliminary engineering report shall include a summary of
applicable codes and standards that apply to the proposed project.
(3-24-22)
iv. Cost estimate. The
preliminary engineering report shall provide, as applicable, estimated
construction costs for public works projects or projects funded through public
monies. (3-24-22)
v. Construction
schedule. The preliminary engineering report shall include the proposed
construction schedule. (3-24-22)
vi. Potential sources of contamination.
Identify sources of contamination and describe how the drinking water sources
will be protected. (3-24-22)
vii.
Soils and ground water levels. Generally discuss soil, ground water conditions,
and potential building foundation problems, including a description of:
(3-24-22)
(1) The character of the soil
through which water mains are to be laid; (3-24-22)
(2) Characteristics of the soil, water table,
and geological substrate that may affect the design and construction of the
foundations of proposed structures; and (3-24-22)
(3) The approximate elevation of ground water
in relation to subsurface structures. (3-24-22)
b. Drinking water wells and spring
construction projects. In addition to items listed in Subsection
503.03.a., a preliminary
engineering report for source water construction projects shall include all
items listed in Subsection
503.03.b., applicable items in
Sections 510 through
514, and Sections
500 to
552 should be evaluated for their
relevance to the project. (3-24-22)
i.
Anticipated geology and hydrogeology. Include geological data and existing well
logs. (3-24-22)
ii. Drilling
methodology. Describe the anticipated drilling method and well construction.
(3-24-22)
iii. Water quality.
Anticipated potability and water quality including monitoring results required
for new sources by these rules. (3-24-22)
iv. Water rights. Provide the appropriate
documentation for the water rights for the drinking water source.
(3-24-22)
v. Dimensions of the well
lot and location of source. Include geographical coordinates of the source
location. (3-24-22)
vi. Evaluation
of surface water influence. For all new ground water sources, including but not
limited to wells, springs, and infiltration galleries, systems shall supply
information as required by the Department to determine if these sources are
under the direct influence of surface water. (3-24-22)
vii. Provide a site evaluation report as
required by Section 510 for wells
and 514 for springs. (3-24-22)
c. Well and pump house construction projects.
In addition to items listed in Subsection
503.03.a., preliminary
engineering reports for well and pump house construction projects shall include
all items listed in Subsection
503.03.c., applicable items in
Sections 511,
541,
547, and Sections
500 to
552 should be evaluated for their
relevance to the project. (3-24-22)
i. Well
house. Include information on the anticipated construction and well house
equipment such as heating, ventilation, interior lighting, and drain(s).
(3-24-22)
ii. Water Level. Provide
a brief description of the means for measuring the water level in the well.
(3-24-22)
iii. Well pump. Include
information on the proposed or planned pump, including the pump curve.
(3-24-22)
iv. Controls. Describe
the equipment and controls for the well and pump house. This includes but is
not limited to system control and data acquisition, variable frequency drive,
and other manual or automated controls within the well house.
(3-24-22)
v. Piping and
appurtenances including but not limited to sample taps, discharge piping, flow
meters, check valves, and pressure gauges. Describe the receiving system for
the pump to waste volume of water including an evaluation of the capacity of
the receiving system and, if applicable, provide documentation that the system
owner will accept the estimated volume of water and any limitations the owner
places upon that acceptance. (3-24-22)
vi. Well vent. Describe the well vent if
applicable. (3-24-22)
vii. Casings
and well caps. Describe the anticipated casing and well cap type and materials.
(3-24-22)
viii. Pitless adapters
and units. Describe the anticipated pitless adapter for the well.
(3-24-22)
ix. Soil and water
conditions. Describe the soil and ground water conditions that may affect the
design and construction of proposed structure(s). (3-24-22)
d. Reservoir and storage construction
projects. In addition to items listed in Subsection
503.03.a., preliminary
engineering reports for reservoir and storage construction projects shall
include all items listed in Subsection
503.03.d., applicable items in
Sections 544, and Sections
500 to
552 should be evaluated for their
relevance to the project. (3-24-22)
i. Sizing.
Describe the required storage capacity and the related components of finished
water storage. (3-24-22)
ii.
Overflow. Describe the anticipated overflow system for the water storage
project and where the overflow will discharge. (3-24-22)
iii. Vents. Describe the venting system used
for the water storage project if applicable. (3-24-22)
iv. Construction materials. Describe the
construction materials used for the storage project. (3-24-22)
v. Protection from freezing. Describe the
protection of storage facility features from freezing especially riser pipes,
overflows, and vents. (3-24-22)
vi.
Grading. Describe any site work or grading that may be necessary.
(3-24-22)
vii. Corrosion
prevention. Provide a discussion on methods to prevent corrosion such as
coatings, cathodic protection, corrosion resistant materials, and encasement.
(3-24-22)
viii. Disinfection.
Describe the methods to be used to disinfect the storage facility and the
testing to check for proper disinfection. (3-24-22)
e. Surface water and ground water under the
direct influence of surface water (GWUDI) treatment construction projects. In
addition to items listed in Subsection
503.03.a., preliminary
engineering reports for surface water treatment and GWUDI construction projects
shall include all items listed in Sections
503.03.e., applicable items in
Sections 515 through
540, and Sections
500 to
552 should be evaluated for their
relevance to the project. (3-24-22)
i. Intake
structures. Describe the intake structures that will be used.
(3-24-22)
ii. Off-stream raw water
storage. If applicable, describe the proposed off-stream raw water storage.
(3-24-22)
iii. Treatment methods.
Describe the treatment methods and potential alternatives including the removal
of pathogens, disinfection, enhanced disinfection, water quality monitoring,
and redundancy provisions. (3-24-22)
iv. Treatment Wastes. Characterize the
various wastes from the water treatment processes and, if applicable, their
volumes, constituents, and proposed treatment and disposal. If discharging to a
sanitary sewage system, verify that the system is capable of handling the flow
to the treatment works and that the treatment works is capable and willing to
accept the additional loading. (3-24-22)
v. Monitoring Results. Provide applicable raw
water monitoring results as required by these rules including anticipated
turbidity ranges, microbiological, physical, chemical, radiological, and other
parameters as determined by the Department. (3-24-22)
vi. Potential contamination. An assessment of
the degree of hazard to the supply by agricultural, industrial, recreational,
and residential activities in the watershed, and by accidental spillage of
materials that may be toxic, harmful or detrimental to treatment processes.
(3-24-22)
vii. Waste discharge.
Assess all waste discharges and activities that could impact the water supply.
The location of each waste discharge shall be shown on a scale map.
(3-24-22)
viii. Hydrological and
historical stream flow data. Provide any available records and data.
(3-24-22)
ix. Water rights and
water quantity. A copy of the appropriate permit(s) or application(s) from the
Idaho Department of Water Resources regarding authorization to appropriate
public waters of the state of Idaho in sufficient quantity to meet the design
requirements of the system. (3-24-22)
x. Turbidity. Anticipated turbidity range.
(3-24-22)
xi. Watershed. Assessment
of the degree of control the water system will be able to exercise over the
watershed. (3-24-22)
xii. Projected
future uses of impoundments or reservoirs within the watershed.
(3-24-22)
xiii. Water quality.
Submit source water sample data over a sufficient period of time to assess the
microbiological, physical, chemical and radiological characteristics of the
water. (3-24-22)
xiv. Stream
characteristics. Provide consideration of currents, wind and ice conditions,
and the effect of confluent streams. (3-24-22)