Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 217 - DESIGN CRITERIA FOR DOMESTIC WASTEWATER SYSTEMS › Subchapter A - ADMINISTRATIVE REQUIREMENTS › Section 217.10 - Final Engineering Report

Current through Reg. 49, No. 28; July 12, 2024
(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.