Washington Administrative Code › Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508) › Chapter 173-240 - Submission of plans and reports for construction of wastewater facilities › INDUSTRIAL WASTEWATER FACILITIES › Section 173-240-130 - Engineering report

Current through Register Vol. 24-14, July 15, 2024
(1) The
				engineering report for an industrial wastewater facility must be sufficiently
				complete so that plans and specifications can be developed from it without
				substantial changes. Two copies of the report must be submitted to the
				department for approval.
(2) The
				engineering report shall include the following information together with any
				other relevant data as requested by the department:
(a) Type of industry or business;
(b) The kind and quantity of finished
				product;
(c) The quantity and
				quality of water used by the industry and a description of how it is consumed
				or disposed of, including:
(i) The quantity
				and quality of all process wastewater and method of disposal;
(ii) The quantity of domestic wastewater and
				how it is disposed of;
(iii) The
				quantity and quality of noncontact cooling water (including air conditioning)
				and how it is disposed of; and
(iv)
				The quantity of water consumed or lost to evaporation.
(d) The amount and kind of chemicals used in
				the treatment process, if any;
(e)
				The basic design data and sizing calculations of the treatment units;
(f) A discussion of the suitability of the
				proposed site for the facility;
(g)
				A description of the treatment process and operation, including a flow
				diagram;
(h) All necessary maps and
				layout sketches;
(i) Provisions for
				bypass, if any;
(j) Physical
				provision for oil and hazardous material spill control or accidental discharge
				prevention or both;
(k) Results to
				be expected from the treatment process including the predicted wastewater
				characteristics, as shown in the waste discharge permit, where
				applicable;
(l) A description of
				the receiving water, location of the point of discharge, applicable water
				quality standards, and how water quality standards will be met outside of any
				applicable dilution zone;
(m)
				Detailed outfall analysis;
(n) The
				relationship to existing treatment facilities, if any;
(o) Where discharge is to a municipal
				sewerage system, a discussion of that system's ability to transport and treat
				the proposed industrial waste discharge without exceeding the municipality's
				allocated industrial capacity. Also, a discussion on the effects of the
				proposed industrial discharge on the use or disposal of municipal
				sludge;
(p) Where discharge is
				through land application, including seepage lagoons, irrigation, and subsurface
				disposal, a geohydrologic evaluation of factors such as:
(i) Depth to groundwater and groundwater
				movement during different times of the year;
(ii) Water balance analysis of the proposed
				discharge area;
(iii) Overall
				effects of the proposed facility upon the groundwater in conjunction with any
				other land application facilities that may be present;
(q) A statement expressing sound engineering
				justification through the use of pilot plant data, results from other similar
				installations, or scientific evidence from the literature, or both, that the
				effluent from the proposed facility will meet applicable permit effluent
				limitations or pretreatment standards or both;
(r) A discussion of the method of final
				sludge disposal selected and any alternatives considered with reasons for
				rejection;
(s) A statement
				regarding who will own, operate, and maintain the system after
				construction;
(t) A statement
				regarding compliance with any state or local water quality management plan or
				any plan adopted under the Federal Water Pollution Control Act as
				amended;
(u) Provisions for any
				committed future plans;
(v) A
				discussion of the various alternatives evaluated, if any, and reasons they are
				unacceptable;
(w) A timetable for
				final design and construction;
(x)
				A statement regarding compliance with the State Environmental Policy Act (SEPA)
				and the National Environmental Policy Act (NEPA), if applicable;
(y) Additional items to be included in an
				engineering report for a solid waste leachate treatment system are:
(i) A vicinity map and also a site map that
				shows topography, location of utilities, and location of the leachate
				collection network, treatment systems, and disposal;
(ii) Discussion of the solid waste site,
				working areas, soil profile, rainfall data, and groundwater movement and
				usage;
(iii) A statement of the
				capital costs and the annual operation and maintenance costs;
(iv) A description of all sources of water
				supply within two thousand feet of the proposed disposal site. Particular
				attention should be given to showing impact on usable or potentially usable
				aquifers.