Table 1 to § 63.342 -Summary of Operation and Maintenance Practices
Control technique | Operation and maintenance practices | Frequency |
Composite mesh-pad (CMP) system | 1. Visually inspect device to ensure there is proper drainage, no chronic acid buildup on the pads, and no evidence of chemical attack on the structural integrity of the device | 1. 1/quarter. |
2. Visually inspect back portion of the mesh pad closest to the fan to ensure there is no breakthrough of chromic acid mist | 2. 1/quarter. | |
3. Visually inspect ductwork from tank to the control device to ensure there are no leaks | 3. 1/quarter. | |
4. Perform washdown of the composite mesh-pads in accordance with manufacturers recommendations | 4. Per manufacturer. | |
Packed-bed scrubber (PSB) | 1. Visually inspect device to ensure there is proper drainage, no chromic acid buildup on the packed beds, and no evidence of chemical attack on the structural integrity of the device | 1. 1/quarter. |
2. Visually inspect back portion of the chevron blade mist eliminator to ensure that it is dry and there is no breakthrough of chromic acid mist | 2. 1/quarter. | |
3. Same as number 3 above | 3. 1/quarter. | |
4. Add fresh makeup water to the top of the packed beda b | 4. Whenever makeup is added. | |
PBS/CMP system | 1. Same as for CMP system | 1. 1/quarter. |
2. Same as for CMP system | 2. 1/quarter. | |
3. Same as for CMP system | 3. 1/quarter. | |
4. Same as for CMP system | 4. Per manufacturer. | |
Fiber-bed mist eliminatorc | 1. Visually inspect fiber-bed unit and prefiltering device to ensure there is proper drainage, no chromic acid buildup in the units, and no evidence of chemical attack on the structural integrity of the devices | 1. 1/quarter. |
2. Visually inspect ductwork from tank or tanks to the control device to ensure there are no leaks | 2. 1/quarter. | |
3. Perform washdown of fiber elements in accordance with manufacturers recommendations | 3. Per manufacturer. | |
Air pollution control device (APCD) not listed in rule | To be proposed by the source for approval by the Administrator | To be proposed by the source for approval by the Administrator. |
Monitoring Equipment | ||
Pitot tube | Backflush with water, or remove from the duct and rinse with fresh water. Replace in the duct and rotate 180 degrees to ensure that the same zero reading is obtained. Check pitot tube ends for damage. Replace pitot tube if cracked or fatigued | 1/quarter. |
Stalagmometer | Follow manufacturers recommendations |
a If greater than 50 percent of the scrubber water is drained (e.g., for maintenance purposes), makeup water may be added to the scrubber basin.
b For horizontal-flow scrubbers, top is defined as the section of the unit directly above the packing media such that the makeup water would flow perpendicular to the air flow through the packing. For vertical-flow units, the top is defined as the area downstream of the packing material such that the makeup water would flow countercurrent to the air flow through the unit.
c Work practice standards for the control device installed upstream of the fiber-bed mist eliminator to prevent plugging do not apply as long as the work practice standards for the fiber-bed unit are followed.
Table 2 to § 63.342 -Housekeeping Practices
For | You must: | At this minimum frequency |
1. Any substance used in an affected chromium electroplating or chromium anodizing tank that contains hexavalent chromium | (a) Store the substance in a closed container in an enclosed storage area or building; AND (b) Use a closed container when transporting the substance from the enclosed storage area | At all times, except when transferring the substance to and from the container. Whenever transporting substance, except when transferring the substance to and from the container. |
2. Each affected tank, to minimize spills of bath solution that result from dragout. Note: this measure does not require the return of contaminated bath solution to the tank. This requirement applies only as the parts are removed from the tank. Once away from the tank area, any spilled solution must be handled in accordance with Item 4 of these housekeeping measures | (a) Install drip trays that collect and return to the tank any bath solution that drips or drains from parts as the parts are removed from the tank; OR (b) Contain and return to the tank any bath solution that drains or drips from parts as the parts are removed from the tank; OR (c) Collect and treat in an onsite wastewater treatment plant any bath solution that drains or drips from parts as the parts are removed from the tank | Prior to operating the tank. Whenever removing parts from an affected tank. Whenever removing parts from an affected tank. |
3. Each spraying operation for removing excess chromic acid from parts removed from, and occurring over, an affected tank | Install a splash guard to minimize overspray during spraying operations and to ensure that any hexavalent chromium laden liquid captured by the splash guard is returned to the affected chromium electroplating or anodizing tank | Prior to any such spraying operation. |
4. Each operation that involves the handling or use of any substance used in an affected chromium electroplating or chromium anodizing tank that contains hexavalent chromium | Begin clean up, or otherwise contain, all spills of the substance. Note: substances that fall or flow into drip trays, pans, sumps, or other containment areas are not considered spills | Within 1 hour of the spill. |
5. Surfaces within the enclosed storage area, open floor area, walkways around affected tanks contaminated with hexavalent chromium from an affected chromium electroplating or chromium anodizing tank | (a) Clean the surfaces using one or more of the following methods: HEPA vacuuming; Hand-wiping with a damp cloth; Wet mopping; Hose down or rinse with potable water that is collected in a wastewater collection system; Other cleaning method approved by the permitting authority; OR (b) Apply a non-toxic chemical dust suppressant to the surfaces | At least once every 7 days if one or more chromium electroplating or chromium anodizing tanks were used, or at least after every 40 hours of operating time of one or more affection chromium electroplating or chromium anodizing tank, whichever is later. According to manufacturer's recommendations. |
6. All buffing, grinding, or polishing operations that are located in the same room as chromium electroplating or chromium anodizing operations | Separate the operation from any affected electroplating or anodizing operation by installing a physical barrier; the barrier may take the form of plastic strip curtains | Prior to beginning the buffing, grinding, or polishing operation. |
7. All chromium or chromium-containing wastes generated from housekeeping activities | Store, dispose, recover, or recycle the wastes using practices that do not lead to fugitive dust and in accordance with hazardous waste requirements | At all times. |
40 C.F.R. §63.342