| (a) An owner shall submit an engineering report within
30 days of the date of the executive director's written request.
(b) The engineering report must include the signed
and dated seal of the engineer responsible for the engineering report.
(c) The engineering report must include all pertinent
calculations, analyses, graphs, formulas, constants, tables, geologic
information, hydraulic information, hydrological information, historical
data, manufacturer's recommendations, technical assumptions, and any
other information needed to demonstrate that the design of the project
complies with this chapter.
(d) If a variance is requested, the engineering report
must include a justification for the variance and all pertinent supporting
calculations, analyses, graphs, formulas, constants, tables, geologic
information, hydraulic information, hydrological information, historical
data, manufacturer's recommendations, technical assumptions, and any
other information needed to justify the variance request.
(e) If the executive director requests additional information
for the engineering report, an owner shall submit the requested information
prepared, signed, and sealed by an engineer, within 30 days after
the date of a written request.
(f) The engineering report for a collection system
project must include the following:
(1) a map showing the current service area, the proposed
service area, and any area proposed for future expansion;
(2) the topographical features of the current, the
proposed, and any future service areas;
(3) a description of how the design flow was determined;
(4) the minimum and maximum grades for each size and
type of pipe;
(5) calculations of expected minimum and maximum velocities
in the collection system for each size and type of pipe;
(6) the proposed project's effect on the existing collection
system's capacity;
(7) the existing and anticipated inflow and infiltration,
the hydraulic effect of the inflow and infiltration on the proposed
and existing systems, inflow and infiltration flow rate monitoring,
and inflow and infiltration abatement measures;
(8) a description of the ability of the existing and
proposed trunk and interceptor collection systems and lift stations
to handle the peak flow;
(9) the capability of the associated wastewater treatment
facility to receive and treat the anticipated peak flow;
(10) an engineering analysis demonstrating compliance
with structural design, minimization of odor-causing conditions, and
pipe design requirements of this chapter;
(11) a description of the areas not initially served
by the project, and the projected means of providing service to these
areas, including special provisions incorporated into the present
plans for future expansion;
(12) the calculations and pump curves showing the operating
characteristics of all collection system lift stations at minimum,
maximum, and design flows during both present and future conditions;
and
(13) the safety considerations incorporated into a
project design, including ventilation, entrances, working areas, explosion
prevention, and methods for rerouting a portion of the collection
system during repair work.
(g) The engineering report for a wastewater treatment
facility project must include the quantity and characteristics of
the influent, wastewater treatment facility siting information, a
sludge management plan, methods to control bypassing, calculations
and supporting information.
(1) Influent Characteristics. The engineering report
must include quantity and characteristics of any existing wastewater
influent, any proposed changes to the influent quantity and characteristics,
and any anticipated changes to the influent quantity and characteristics.
If adequate records are not available, analyses must be made of the
existing conditions, and the results included in the engineering report.
(2) Wastewater Treatment Facility Siting Information.
The engineering report must include:
(A) a general location map for the proposed wastewater
treatment facility;
(B) a description of the area surrounding the wastewater
treatment facility that includes prevailing winds, water treatment
facilities, water supply wells, surface water intakes, housing developments,
industrial sites, highways, streets, parks, schools, recreational
areas, shopping centers, and any other information required by the
executive director;
(C) a map of the wastewater treatment facility site,
including the site boundary, buffer zones, and the 100-year floodplain,
with supporting documentation of compliance with the buffer zone criteria
and the 100-year floodplain restrictions specified in §309.13
of this title (relating to Unsuitable Site Characteristics) that is
clearly legible; and
(D) a map of the discharge route or land application
unit that is clearly legible.
(3) Sludge Management Plan. The engineering report
must include a sludge management plan that provides information regarding:
(A) the estimated quantity and quality of sludge that
will be generated, including future sludge loads based on flow projections;
(B) the sludge treatment requirements for final disposal,
and the sludge storage requirements for each alternative;
(C) a method of sludge transport, use, storage, and
disposal; and
(D) the alternatives, contingencies, and mitigation
plans that ensure reliable capacity and operational flexibility.
(4) Methods to Control Bypassing. The engineering report
must include:
(A) information and data describing features to prevent
bypassing such as auxiliary power, standby and duplicate units, holding
tanks, stormwater clarifiers, or flow equalization basins; and
(B) operational arrangements such as the ability of
pipes and valves to control flow through the treatment units and reliability
of power sources to prevent unauthorized discharges of untreated or
partially treated wastewater.
(5) Calculations and Supporting Information. The engineering
report must include:
(A) the types of units proposed and their capacities;
(B) the detention times, surface loadings, and weir
loadings pertinent to each wastewater treatment unit;
(C) a plot of the hydraulic gradient at peak flow conditions
for all gravity lines;
(D) the anticipated operation mode of the wastewater
treatment facility;
(E) organic and volumetric loadings pertinent to each
treatment unit; and
(F) aeration demands and how those demands will be
supplied.
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