Illinois Administrative Code

Section 370.1130 Low Rate Intermittent or Periodically Dosed Sand Filters a) Applicability 1) Intermittent sand filters may be used to polish secondary effluents. The process removes residual suspended solids and soluble biochemical oxygen demand and converts ammonia to nitrate. …

Section 370.115 Incoporations by Reference a) The following materials are incorporated by reference: 1) "Glossary: Water and Wastewater Control Engineering", Joint Editorial Board of the American Public Health Association, American Society of Civil Engineers, American Wasteworks …

Section 370.1200 Phosphorus Removal by Chemical Treatment a) General 1) Method Addition of lime or the salts of aluminum or iron may be used for the chemical removal of soluble phosphorus. The phosphorus reacts with the calcium, aluminum or iron ions to form insoluble compounds. …

Section 370.1210 Ammonia Control a) General Ammonia control can be accomplished by physical, chemical, biological and ion-exchange techniques. These criteria contain design standards for a limited number of biological types and configurations of ammonia control systems. Other typ…

Section 370.200 General The criteria in this Subpart B are intended to be the technical basis for the preparation of the engineering reports and plans and specifications for waste collection and treatment works. For project planning requirements, applicable State and Federal guid…

Section 370.210 Engineering Report a) General 1) The engineering report assembles basic information; presents design criteria and assumptions; examines alternate projects including preliminary layouts and cost estimates; describes financing methods, user charges and operation and…

Section 370.211 Design Flows The following flows shall be identified in the basis of design for sewers, lift stations, sewage treatment plants, treatment units and other wastewater handling facilities. a) Design Average Flow The design average flow is the average of the daily vol…

Section 370.220 Detailed Engineering Plan Drawings Format a) General Detail plans shall contain as necessary, the following: 1) Plan views. 2) Elevations. 3) Sections and supplementary views which, together with the specifications and general layouts, facilitate construction of t…

Section 370.230 Specifications to Accompany Detailed Engineering Plan Drawings a) Complete technical specifications for the construction of sewers, sewage pumping stations, sewage treatment plants, and all appurtenances, shall accompany the plans. b) The specifications accompanyi…

Section 370.240 Revisions to Approved Plans and Specifications a) Any deviations from approved plans or specifications for structural configuration, appurtenances or manufactured equipment, affecting capacity, flow, operation of units or operational safety, and for substitution o…

Section 370.250 Operation During Construction Specifications shall contain a time schedule describing the plant and collection system operational modes during construction. Where units essential to effluent quality are involved, temporary measures, such as wet hauling, sludge sto…

Section 370.260 Engineers Seal Plans and specifications, prepared by an Illinois Registered Professional Engineer when required by Section 14 of the Illinois Professional Engineering Act [225 ILCS 325/14], fully describing the design, nature, function and interrelationship of eac…

Section 370.300 General Considerations a) Type of Sewers The Agency will approve plans for new sewer systems and extensions only when designed as the separate sanitary type in which precipitation runoff and ground water from foundation drains are excluded. The Agency will not app…

Section 370.310 Design Basis a) Per Capita Flow 1) New Sewers for Undeveloped Areas New sewer systems to serve currently undeveloped areas shall be designed on the basis of a design average flow of not less than 100 gallons per capita per day which is assumed to cover normal infi…

Section 370.320 Details of Design and Construction a) Minimum Size No public gravity sewer conveying raw sewage shall be less than 8 inches in diameter. b) Depth Sewers shall be sufficiently deep to prevent freezing. Sewers should be sufficiently deep to serve basements except wh…

Section 370.330 Manholes a) Location Except as noted in Section 370.123(d)(2), manholes shall be installed at the end of each line; at all changes in grade, size or alignment; at all sewer intersections; and at distances not greater than 400 feet for sewers 15 inches or less, and…

Section 370.340 Sewers in Relation to Streams a) Location of Sewers on Streams 1) Cover Depth A) The top of all sewers entering or crossing streams shall be at a sufficient depth below the natural bottom of the stream bed to protect the sewer line. In general the following cover …

Section 370.350 Protection of Water Supplies a) Water Supply Interconnections There shall be no physical connections between a public or private potable water supply system and a sewer, or appurtenance thereto, which would permit the passage of any sewage or polluted water into t…

Section 370.400 General a) Flooding Sewage pumping station structures and electrical and mechanical equipment shall be protected from physical damage by the 100 year flood. Sewage pumping stations should remain fully operational and accessible during the 25 year flood. Regulation…

Section 370.410 Design The following items should be given consideration in the design of sewage pumping stations: a) Type Sewage pumping stations in general use fall into three types: wet well/dry well, submersible, and suction lift. b) Structures 1) Separation Dry wells, includ…

Section 370.420 Suction-Lift Pump Stations a) Pump Priming and Lift Requirements Suction lift pumps shall be of the self-priming or vacuum-priming type and shall meet the applicable requirements of Section 370.132. Suction lift pump stations using dynamic suction lifts exceeding …

Section 370.430 Submersible Pump Stations - Special Considerations Submersible pump stations shall meet the applicable requirements under Section 370.132, except as modified in this Section. a) Construction Submersible pumps and motors shall be designed specifically for raw sewag…

Section 370.440 Alarm Systems Alarm systems shall be provided for pumping stations. The alarm shall be activated in cases of power failure, pump failure, unauthorized entry, or any cause of pump station malfunction. Pumping station alarms shall be telemetered to a municipal facil…

Section 370.450 Emergency Operation a) Objective The objective of emergency operation is to prevent the discharge of raw or partially treated sewage to any waters and to protect public health by preventing back-up of sewage and subsequent discharge to basements, streets, and othe…

Section 370.460 Instructions and Equipment Sewage pumping stations and portable equipment shall be supplied with a complete set of operational instructions, including emergency procedures, maintenance schedules, tools and such spare parts as may be necessary.

Section 370.470 Force Mains a) Velocity and Diameter At design pumping rates, a cleansing velocity of at least 2 feet per second should be maintained. Lower velocities may be permitted for very small installations. The minimum force main diameter for raw sewage shall be 4 inches …

Section 370.500 Plant Location a) General The following items shall be considered when selecting a plant site: 1) Proximity to residential areas. 2) Direction of prevailing winds. 3) Necessary routing to provide accessibility by all weather roads. 4) Area available for expansion.…

Section 370.510 Quality of Effluent The required degree of wastewater treatment shall be established by reference to applicable effluent and water quality standards contained in 35 Ill. Adm. Code Subtitle C, Chapter I unless more stringent limitations have been established. (Sour…

Section 370.520 Design a) Type of Treatment 1) As a minimum, the following items shall be considered in the selection of the type of treatment: A) Present and future effluent requirements. B) Location and local topography of the plant site. C) The effects of industrial wastes lik…

Section 370.530 Plant Details a) Installation of Mechanical Equipment The specifications shall be so written that the installation and initial operation of major items of mechanical equipment will be inspected and approved by a representative of the manufacturer. b) Bypasses Prop…

Section 370.540 Plant Outfalls a) Discharge Impact Control The outfall sewer shall be designed to discharge to the receiving stream in a manner acceptable to the Agency. Consideration should be given in each case to the following: 1) Preference for free fall or submerged discharg…

Section 370.550 Essential Facilities a) Emergency Power or Pumping Facilities 1) All plants shall be provided with an alternate source of electric power or pumping capability to allow continuity of operation during power failures. Methods of providing power or pumping capability …

Section 370.560 Safety a) Adequate provision shall be made to effectively protect the operator and visitors from hazards. The following shall be provided to fulfill the particular needs of each plant: 1) Enclosure of the plant site with a fence designed to discourage the entrance…

Section 370.570 Laboratory a) All treatment works shall include a laboratory for making the necessary analytical determinations and operating control tests, except for those plants utilizing only processes not requiring laboratory testing for plant control and satisfactory off-si…

Section 370.600 General Considerations a) Safety Safety Features Relative to Location 1) Railings and Gratings A) Manually cleaned channels shall be protected by guard railings and deck gratings, with adequate provisions for removal or opening to facilitate raking. B) Mechanicall…

Section 370.610 Screening Devices a) Bar Racks and Screens 1) Where Required Screening of raw sewage shall be provided at all mechanical treatment works. For lift station applications, see Subpart D. 2) Design and Installation A) Manually Cleaned Screens Clear openings for manual…

Section 370.620 Grit Removal Facilities a) Where Required Grit removal facilities should be provided for all sewage treatment plants and are required for plants receiving sewage from combined sewers or from sewer systems receiving substantial amounts of grit. If a plant serving a…

Section 370.630 Pre-Aeration Pre-aeration of sewage to reduce septicity may be required in special cases. (Source: Added at 21 Ill. Reg. 12444, effective August 28, 1997) SUBPART G: SETTLING

Section 370.700 General Considerations a) Number of Units Multiple units capable of independent operation are desirable and shall be provided in all plants where design average flows exceed 100,000 gallons per day. Plants not having multiple units shall include other provisions t…

Section 370.710 Design Considerations a) Dimensions The minimum length of flow from inlet to outlet should be 10 feet unless special provisions are made to prevent short circuiting. The sidewater depth for primary clarifiers shall be as shallow as practicable, but not less than 7…

Section 370.720 Sludge and Scum Removal a) Scum Removal Full surface mechanical scum collection and removal facilities, including baffling, shall be provided for all settling tanks, except for Imhoff tanks. The unusual characteristics of scum which may adversely affect pumping, p…

Section 370.730 Protection and Service Facilities a) Operator Protection All settling tanks shall be equipped to enhance safety for operators. Such features shall appropriately include machinery covers, life lines, stairways, walkways, handrails and slip-resistant surfaces. If si…

Section 370.740 Imhoff Tanks a) General Imhoff tanks may be used for the sedimentation of settleable solids and for the unheated anaerobic digestion of these solids. b) Settling Compartment Design 1) Settling Rate Surface settling rate shall not exceed 1000 gallons per day per sq…

Section 370.750 Septic Tank - Tile System a) General Septic tank tile systems shall be used only for domestic or similar organic waste, where soil conditions are suitable and sewers tributary to treatment works are not available. b) Design Standards Specific design information is…

Section 370.800 General Facilities for processing sludge shall be provided at all mechanical sewage treatment plants. Handling equipment shall be capable of processing sludge to a form suitable for ultimate disposal.

Section 370.810 Process Selection The selection of sludge handling unit processes should be based upon at least the following considerations: a) Local land use. b) System energy requirements. c) Cost effectiveness of sludge thickening and dewatering. d) Equipment complexity and s…

Section 370.820 Sludge Thickening a) Sludge thickeners to reduce the volume of sludge should be considered. The design of thickeners (gravity tank, gravity belt, dissolved-air flotation, centrifuge, and others) should take into account the type and concentration of sludge, the sl…