SIC Codes
| INDUSTRIAL ACTIVITIES | SIC CODE |
| Metal Mining |
10xx |
| Coal Mining |
12xx |
| Oil and Gas Extraction |
13xx |
| Mining and Quarrying of Nonmetallic Minerals, except Fuels (except facilities in SIC Codes 1411, 1422, 1423, 1429, 1442, 1446, 1445, 1459, and 1499; these facilities are covered under the Sand and Gravel General Permit |
14xx |
| Food and Kindred Products |
20xx |
| Tobacco Products |
21xx |
| Textile Mill Products |
22xx |
| Apparel and Other Finished Products Made from Fabrics and Similar Material |
23xx |
| Lumber and Wood Products |
24xx |
| Furniture and Fixtures |
25xx |
| Paper and Allied Products |
26xx |
| Printing, Publishing, and Allied Products |
27xx |
| Chemicals and Allied Products |
28xx |
| Petroleum Refining and Related Industries (Except facilities in SIC 2951; these facilities are covered under the Sand and Gravel General Permit) |
29xx |
| Rubber and Miscellaneous Products |
30xx |
| Leather and Leather Products |
31xx |
| Stone, Clay, Glass, and Concrete Products (Except facilities in SIC 3272-3273; these facilities are covered under the Sand and Gravel General Permit |
32xx |
| Primary Metal Industries |
33xx |
| Fabricated Metal Products |
34xx |
| Industrial and Commercial Machinery and Computer Equipment |
35xx |
| Electronic and Other Electrical Equipment and Components |
36xx |
| Transportation Equipment |
37xx |
| Measuring, Analyzing, and Controlling Instruments; Photographic, Medical, and Optical Goods; Watches and Clocks |
38xx |
| Miscellaneous Manufacturing Industries |
39xx |
| Farm Product Storage |
4221 |
| Refrigerated Storage |
4222 |
| General Storage |
4225 |
| Recycling facilities involved in the recycling of materials, including but not limited to, metal scrap yards, battery reclaimers, salvage yards, auto recyclers, and automobile junkyards |
5015 & 5093 |
| Steam Electric Power Generation |
N/A |
| Active landfills, including but not limited to, wood waste and inert landfills, transfer stations, open dumps, compost facilities, and land application sites, except as described in S1.C.6 or C.7 of the permit application |
4953 |
| Hazardous waste treatment, storage, and disposal (TSD) facilities, and recycling facilities regulated under Chapter 173-303 WAC |
N/A |
| Treatment works treating domestic sewage, or any other sewage sludge, or wastewater treatment device or system, used in storage, recycling, and reclamation or municipal or domestic sewage (including land dedicated to the disposal of sewage sludge that located within the confines of the facility) with the design flow capacity of 1 million gallons per day (MGD) or more, or required to have a pretreatment program under 40 CFR §403 |
4952 |
| Transportation facilities which have vehicle maintenance activity, equipment cleaning operations, or airport deicing operations: Railroad Transportation Local and Suburban Transit and Interurban Highway Passenger Transportation Motor Freight Transportation (except SIC 4221-25) United States Postal Service Water Transportation Air Transportation Petroleum Bulk Stations and Terminals | 40xx
41xx |