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9VAC25-151-340. Sector AA - Fabricated metal products.

A. Discharges covered under this section. The requirements listed under this section apply to stormwater discharges associated with industrial activity from the fabricated metals industry listed below, except for electrical related industries: fabricated metal products, except machinery and transportation equipment (SIC Code 34); and jewelry, silverware, and plated ware (SIC Code 391).

B. Stormwater pollution prevention plan requirements. In addition to the requirements of Part III, the SWPPP shall include, at a minimum, the following items.

1. Site description.

a. Site Map. The site map shall identify where any of the following may be exposed to precipitation or surface runoff: raw metal storage areas; finished metal storage areas; scrap disposal collection sites; equipment storage areas; retention and detention basins; temporary or permanent diversion dikes or berms; right-of-way or perimeter diversion devices; sediment traps or barriers; processing areas including outside painting areas; wood preparation; recycling; and raw material storage.

b. Spills and Leaks. When listing significant spills and leaks, the permittee shall pay attention to the following materials, at a minimum: chromium, toluene, pickle liquor, sulfuric acid, zinc and other water priority chemicals and hazardous chemicals and wastes.

c. Summary of potential pollutant sources. The plan shall include a description of the potential pollutant sources from the following activities: loading and unloading operations for paints, chemicals and raw materials; outdoor storage activities for raw materials, paints, empty containers, corn cob, chemicals, scrap metals; outdoor manufacturing or processing activities such as grinding, cutting, degreasing, buffing, brazing, etc.; and on-site waste disposal practices for spent solvents, sludge, pickling baths, shavings, ingots pieces, refuse and waste piles.

2. Stormwater controls.

a. Good housekeeping.

(1) Raw steel handling storage. The permittee shall describe and implement measures for managing or recovering scrap metals, fines, and iron dust, including measures for containing materials within storage handling areas.

(2) Paints and painting equipment. The permittee shall describe and implement measures to prevent or minimize exposure of paint and painting equipment from exposure to stormwater.

b. Spill prevention and response procedures. The permittee shall ensure that the necessary equipment to implement a cleanup is available to personnel. The following areas shall be addressed:

(1) Metal fabricating areas. The permittee shall describe and implement measures for maintaining clean, dry, orderly conditions in these areas. Use of dry clean-up techniques shall be considered in the plan.

(2) Storage areas for raw metal. The permittee shall describe and implement measures to keep these areas free of conditions that could cause, or impede appropriate timely response to, spills or leakage of materials. The following measures (or their equivalents) shall be considered: storage areas maintained such that there is easy access in the event of a spill; stored materials labeled to aid in identifying spill contents.

(3) Metal working fluid storage areas. The permittee shall describe and implement measures for storage of metal working fluids.

(4) Cleaners and rinse water. The permittee shall describe and implement measures to control and clean up spills of solvents and other liquid cleaners; control sand buildup and disbursement from sand-blasting operations; and prevent exposure of recyclable wastes. Environmentally benign cleaners shall be substituted when possible.

(5) Lubricating oil and hydraulic fluid operations. The permittee shall describe and implement measures to minimize the potential for stormwater contamination from lubricating oil and hydraulic fluid operations. The permittee shall consider using devices or monitoring equipment or other devices to detect and control leaks and overflows. The installation of perimeter controls such as dikes, curbs, grass filter strips, or other equivalent measures shall also be considered.

(6) Chemical storage areas. The permittee shall describe and implement proper storage methods that prevent stormwater contamination and accidental spillage. The plan shall include a program to inspect containers, and identify proper disposal methods.

c. Inspections. Metal fabricators shall at a minimum include the following areas for inspection: raw metal storage areas; finished product storage areas; material and chemical storage areas; recycling areas; loading and unloading areas; equipment storage areas; paint areas; and vehicle fueling and maintenance areas.

d. Comprehensive site compliance evaluation. The site compliance evaluation shall also include inspections of: areas associated with the storage of raw metals; storage of spent solvents and chemicals; outdoor paint areas; and roof drainage. Potential pollutants include chromium, zinc, lubricating oil, solvents, aluminum, oil and grease, methyl ethyl ketone, steel and other related materials.

C. Benchmark monitoring and reporting requirements. Metal fabricating facilities are required to monitor their stormwater discharges for the pollutants of concern listed in Table 340.

Table 340
Sector AA Benchmark Monitoring Requirements

Pollutants of Concern

Benchmark Concentration

Fabricated Metal Products Except Coating (SIC 3411-3471, 3482-3499, 3911-3915)

Total Recoverable Aluminum

750 g/L

Total Recoverable Iron

1.0 mg/L

Total Recoverable Zinc

120 g/L

Total Recoverable Copper

18 μg/L

Fabricated Metal Coating and Engraving (SIC 3479)

Total Recoverable Zinc

120 g/L

Statutory Authority

62.1-44.15 of the Code of Virginia; 402 of the federal Clean Water Act; 40 CFR Parts 122, 123, and 124.

Historical Notes

Derived from Virginia Register Volume 15, Issue 9, eff. June 30, 1999; amended, Virginia Register Volume 20, Issue 16, eff. July 1, 2004; Volume 25, Issue 19, eff. June 24, 2009; Volume 30, Issue 11, eff. July 1, 2014.


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