| (E) Treatment plant site information and the siting
analysis. The location of the plant, the area included in the plant
site, dedicated buffer zone, and a description of the surrounding
area including a map or a sketch of the area. Particular reference
should be made as to the plant's proximity to present and future housing
developments, industrial sites, prevailing winds, highways and/or
public thoroughfares, water plants, water supply wells, parks, schools,
recreational areas, and shopping centers. If the effluent is to be
discharged to the waters of the state, the immediate receiving stream,
canal, major water course, etc., shall be designated. The siting analysis
shall include:
(i) flood hazard analysis. Provide the 100-year flood
plain elevation. Proposed treatment units which are to be located
within the 100-year flood plain will not be approved for construction
unless protective measures satisfactory to the commission (such as
levees or elevation of the treatment units) are included in the project
design;
(ii) buffer zone analysis. Demonstrate that the location
of each proposed treatment unit is consistent with the buffer zone
criteria specified in Chapter 309 of this title (relating to Domestic
Wastewater Effluent Limitation and Plant Siting).
(5) Sludge management. The preliminary engineering
report shall include a discussion of the method of sludge disposal
to be utilized. The report shall assess the following factors:
(A) estimated quantity of sludge that must be handled
which includes future sludge loads based on flow projections;
(B) quality and sludge treatment requirements for ultimate
disposal;
(C) sludge storage requirements for each alternative
considering normal operating requirements and contingencies;
(D) transportation of sludge;
(E) land use and land availability; and
(F) reliability of the various alternatives, contingencies,
and mitigation plans to ensure reliable capacity and operational flexibility.
(6) Control of bypassing. Information and data shall
be submitted to describe features (auxiliary power, standby and duplicate
units, holding tanks, storm water clarifiers, etc.) and operational
arrangements (flexibility of piping and valves to control flow through
the plant, reliability of power sources, etc.) to prevent unauthorized
discharges of untreated or partially treated wastewater. An outline
of control measures to prevent unauthorized discharges of untreated
or partially treated wastewater during construction (see subsection
(e)(5) of this section) is to be included.
(c) Final engineering design report. The final engineering
design report shall be submitted with the final plans and technical
specifications. The report shall include calculations and any other
engineering information pertaining to the plant design as may be necessary
in the review of the plans and specifications by the commission. The
report must include how the design of the collection system and treatment
plant will handle the potential loss of graywater as defined in TWC, §26.0311.
This report shall bear the signed and dated seal of the registered
professional engineer responsible for the design. Information should
be included to describe any changes that have been made since a preliminary
engineering report was submitted, along with additional information
as follows.
(1) Collection system (if applicable):
(A) minimum and maximum grades proposed for each size
and type of pipe;
(B) lift stations (also refer to §317.3 of this
title (relating to Lift Stations)):
(i) the operating characteristics of the stations at
minimum, maximum, and design flows (both present and future);
(ii) safety considerations, such as ventilation, entrances,
working areas, and prevention of explosions; and
(iii) means of preventing overflow of raw sewage;
(C) capability of existing trunk and interceptor sewers
and lift stations to handle the peak flow under anticipated conditions
and capability of existing treatment facilities to receive and adequately
treat the anticipated peak flows;
(D) type of pipe proposed and its anticipated performance
under the conditions imposed by the particular wastewater quality
and loading conditions;
(E) the manhole spacing proposed;
(F) areas not served by the present proposed project,
and the projected means of providing service to these areas, including
special provisions incorporated in the present plans for future expansion;
(G) amount of infiltration/inflow existing and anticipated,
its hydraulic effect on the proposed and existing system, and an
abatement plan if applicable, including a:
(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.
Cont'd... |
