| (i) description of infiltration allowances and test
procedures in the specifications governing design of new sanitary
sewer lines; and
(ii) description of control program to reduce infiltration/inflow
occurring in the existing sewer system;
(H) soil conditions, such as quicksand, that will not
support collection system development, and measures to be taken to
overcome the anticipated difficulties.
(2) Treatment plant:
(A) the final decisions as to the method of treatment;
(B) types of units proposed and their capacities, considering
the criteria contained herein including:
(i) detention times, surface loadings, weir loadings,
and flow diagram; and
(ii) other pertinent information regarding the design
of the plant, including hydraulic profiles for wastewater and sludge
which includes a plot of the hydraulic gradient at peak flow conditions
for all gravity lines;
(C) the anticipated operation mode of the plant, the
degree of treatment expected and any special characteristics of the
plant; and
(D) the safety features included such as stairways,
railing, lighting, insulation mats, and walkway mats.
(3) Sludge management system:
(A) the final decisions as to the method(s) of managing
sludge, including final disposal;
(B) contingency alternatives; and
(C) the type and size of sludge treatment units to
provide the quality of sludge for the selected sludge management method.
(d) Final plans and technical specifications.
(1) Construction drawings and technical specifications
will not be considered for review unless they bear the signed and
dated seal of the registered professional engineer responsible for
the design on each sheet of the plans and on the title page of the
technical specifications. These shall be the plans and specifications
to be used by the contractor for bidding and construction.
(2) Plans and profiles for sanitary sewers, insofar
as practical, shall be prepared using one of the following scales.
Attached Graphic
(3) The size, grade, and type of pipe material shall
be shown. Alternate materials may be identified in the bid document.
(4) The location and structural features of the sewers,
including manholes to be installed, shall be shown on plans and profiles.
The details of the appurtenances shall be provided.
(5) The plans and technical specifications for lift
stations shall fully describe all pumps, valves, pumping control mechanisms,
safety and ventilation equipment, access operator points, hatches,
and hoisting equipment for installing and removing equipment.
(6) The plans and technical specifications for the
wastewater treatment plant shall include construction details for
all units of the plant as well as equipment and material specifications
and installation procedures. The location and details of inlet and
outlet structures, valving, and piping arrangements that allow alternate
modes of operation during periods of stress such as mechanical failure,
structural repair, or any other activity which requires the removal
of one or more treatment elements from service, shall be included.
The plans shall include a hydraulic profile of the treatment facilities
at both design and peak flows. The plans shall also show provisions
for future expansion of the plant, should such be contemplated. Details
of complex piping should be clarified by the inclusion of an isometric
flow diagram as a part of the plans.
(e) Other requirements.
(1) Completion. Upon completion of construction, the
design engineer or other engineer appointed by the owner shall notify
the commission of completion and attest to the fact that the completed
work is substantially in accordance with the plans, technical specifications,
and change orders approved by the commission. If substantial changes
have been made to the original plans, record drawings documenting
such changes shall be submitted to the commission.
(2) Inspection. During construction, the project may
be visited by a representative of the commission during normal working
hours to establish general compliance with the plans and technical
specifications approved by the commission.
(3) Operation and maintenance manual. Prior to completion
of construction of a new wastewater treatment plant or plant expansion,
an operation and maintenance manual covering the recommended operating
procedures and maintenance practices for the entire facility shall
be furnished to the sewerage system owner by the design engineer.
The design engineer shall submit a letter to the commission certifying
that this action has been performed and shall furnish a copy of the
operation and maintenance manual to the commission upon request.
(4) Sludge management implementation plan. The design
engineer shall prepare an implementation plan for the selected sludge
management method. The plan shall identify regulatory requirements
of state and federal agencies. The plan shall also include requirements
for selected contingency alternatives.
(5) Authorization to discharge. For treatment plant
projects, the owner is required to secure proper authorization from
the commission prior to initiation of construction. No discharge shall
be authorized without a discharge permit. In no case shall bypassing
of partially treated wastewater be authorized during construction
without an order for such discharge from the commission. Also see §317.4(a)(3)
of this title (relating to Wastewater Treatment Facilities).
(f) Variance. A variance from the design criteria herein
may be granted by the commission if the variance would not result
in an unreasonable risk to treatment plant performance, public health,
or the waters in the state. Requests for variances must be submitted
in writing by the design engineer and must, for each affected item,
include a detailed engineering justification.
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