Maximum clear openings should be 1 inches (45 mm). 42.232 Safety Landings For built-in-place pump stations, a stairway to the dry well shall be provided with rest landings at vertical intervals not to exceed 12 feet (3.7 m). . Heat exchangers should have a heating capacity of 130 percent of the calculated peak heating requirement to account for the occurrence of sludge tube fouling. 58.432 Bench Tops Bench tops should be constructed of materials resistant to attacks from normally used laboratory reagents. . The laboratory shall have sufficient size, bench space, equipment, and supplies to perform all self-monitoring analytical work required by discharge permits, and to perform the process control tests necessary for good management of each treatment process included in the design. The bench should be sloped no less than inch per foot (40 mm/m) (4 percent). .
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57.26 Protective Clothing and Equipment The following items of protective clothing or equipment shall be available and utilized for all operations or procedures where their use will minimize injury hazard to personnel:. . 58.342 Sinks A laboratory grade sink and drain trap shall be provided. See Standard Methods for the looking for sex workers Examination of Water and Wastewater. 61.15 Electrical Equipment and Control Systems.151 Timing Devices All mechanical units which are operated by timing devices shall be provided with auxiliary controls which will set the cleaning mechanism in operation at a preset high water elevation. . In addition, temperature, alkalinity, pH, and reactor dissolved oxygen shall be considered when designing for nitrification. Domestic waste treatment design shall be on the basis of at least.17 pounds (0.08 kg) of BOD5 per capita per day and.20 pounds (0.09 kg) of suspended solids per capita per day, unless information is submitted to justify alternate designs. Dimensions The dimensions of each independent mixed liquor aeration tank or return sludge reaeration tank shall be such as to maintain effective mixing and utilization of air. . Gratings over appropriate areas of treatment units where access for maintenance is required;. . Not over 24 feet (7.3 m) center to center on grades 35 percent and up to 50 percent; and. . Screens and valves shall be provided on the chemical feed pump suction lines. The hydraulic properties of the system shall be designed to simulate plug flow conditions under the full operating flow range. .
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