Texas Natural Resource Conservation Commission recent permit limits for onshore natural gas plant sulfur recovery units (SRU) (08/96) Units rated between zero and ten long tons per day (LTPD) of sulfur Permit No. Permit Company Location Gas Process TACB PSD Issued Name County Rate MMSCFD 1. 9289 601 06/20/83 Shell Yoakum Varies 2. 9649 683 04/04/86 Arco Yoakum 65 3. 9824A 749 07/14/86 Belvan Crockett 25 4. 9956 --- 04/30/86 Mosbacher Anderson 3.5 5. 15202 --- 04/06/84 Tejas Upshur 50 6. 15550 --- 06/29/84 Whiting Yoakum 3.9 7. 16842 --- 09/11/86 Amoco Hockley 8. 17520 --- 12/23/86 Parker Karnes 15 9. 18279 733 01/06/95 GPM Gas Moore 0.74 10. 18870 --- 06/24/91 Chevron Ward 63.2 11. 24450 --- 08/10/94 Goldston Upshur 65 12. Std. Ex. Exxon Duval 62 Sulfur SRU Percent Tail Gas LTPD Type Recovery Cleanup 1. 4 3 Claus 94 None 2. 1.8 3 Claus 90-95 None 3. 8 3 Claus 96.0 None 4. 2.3 LoCat 99.9+ None 5. 1.4 LoCat 99.97 None 6. 0.18 LoCat 99.97 None 7. 10 LoCat 99.9 None 8. 7 Claus 96.0 None 9. 6 3 Claus 96.0 CBA 10. 4.3 LoCat 95.2- None 99.7 11. 8 2 Stage 98.5 None Claus/CBA 12. 0.1 LoCat 99.0 None Units rated between ten and twenty LTPD of sulfur Permit No. Permit Company Location Gas Process TACB PSD Issued Name County Rate MMSCFD 1. 1306 --- 06/24/94 West. Gas Ward 150 2. 1325A --- 10/23/90 Lone Star Ward 103 3. 5269A 626 05/23/94 Delhi Freestone 201 4. 8914 450 12/31/81 Pogo Hemphill 18.5 5. 9206 482 04/12/83 Liqu. En. Hutchinson 40 6. 16754 682 11/03/92 Amoco Yoakum 100 7. 20418 787 05/05/93 Maxus En. Moore 80 8. 21869 --- 07/28/93 OXY USA Dawson 20.1 9. 31352 856 06/24/96 Rockland Freestone 80 Sulfur SRU Percent Tail Gas LTPD Type Recovery Cleanup 1. 18.2 3 Claus 95.0 None 2. 20 3 Claus 95 None 3. 18 2 Claus & 97.9 None SuperClaus 4. 10 3 Claus 96 None 5. 14 3 Claus 96 None 6. 16.9 LoCat 98.5 None 7. 13.8 3 Claus 98.5 SuperClaus 8. 14 3 Claus 96.0 None 9. 15 3 Claus 98.5 SuperClaus Units rated between twenty and fifty LTPD of sulfur Permit No. Permit Company Location Gas Process TACB PSD Issued Name County) Rate MMSCFD 1. 2351A --- 09/20/91 Tonkawa Gas Pecos 120 2. 7725 --- 05/28/93 Amoco Andrews 30 3. 18406 --- 09/18/91 Amoco Hockley 62 Sulfur SRU Percent Tail Gas LT/D Type Recovery Cleanup 1. 27.5 3 Claus 92.5 None 2. 26 CBA 98.5 None 3. 34 2 Claus 93.5 None Units rated greater than fifty LTPD of sulfur Permit No. Permit Company Location Gas Process TACB PSD Issued Name County Rate MMSCFD 1. 2211A --- 10/21/93 GPM Andrews 4.7 2. 6051 55 02/27/78 Trident Henderson 70 3. 8929 436 06/24/82 Marathon Pecos 40 4. 8986 --- 04/15/82 Delhi Camp 54 5. 8988 470 01/24/83 Delhi Freestone 16 6. 9235 485 10/06/83 Amerada Gaines 180 7. 9304 --- 06/24/83 Darenco Cass 3.7 Sulfur SRU Percent Tail Gas LTPD Type Recovery Cleanup 1. 60 Claus 95.0 None 2. 800 3 Claus 99.7 SCOT 3. 60 MCRC 96-98.5 None 4. 100 Claus 99.7 SCOT 5. 180 Claus 99.8 SCOT 6. 80 CBA 98.5 None 7. 127 3 Claus 99.7+ Stretford Notes CBA - Cold Bed Adsorption MCRC - Mineral and Chemical Resource Company MMSCFD - million standard cubic feet per day SCOT - Shell Claus Offgas Treater