0000891836-08-000215 SC 13D/A 2 20081014 20081014 EDWARD H. MCDERMOTT J. STUART RYAN JOHN H. SCULLY PHOEBE SNOW FOUNDATION, INC. SAN FRANCISCO PARTNERS II, L.P. SF ADVISORY PARTNERS, L.P. SPO ADVISORY CORP. SPO ADVISORY PARTNERS, L.P. SPO PARTNERS II CO-INVESTMENT PARTNERHSIP, L.P. SPO PARTNERS II, L.P. THE ELIZABETH R. & WILLIAM J. PATTERSON FOUNDATION WILLIAM E. OBERNDORF WILLIAM J. PATTERSON CALPINE CORP 0000916457 4911 770212977 DE 1231 SC 13D/A 34 005-48317 081122431 50 WEST SAN FERNANDO ST SAN JOSE CA 95113 4089955115 50 W SAN FERNANDO SUITE 500 SAN JOSE CA 95113 SPO ADVISORY CORP 0000919468 680247274 DE 1231 SC 13D/A 591 REDWOOD HIGHWAY SUITE 3215 MILL VALLEY CA 94941 4153836600 SF ADVISORY CORP 19990329 SC 13D/A 1 sc0115.txt SCHEDULE 13D, AMENDMENT NO. 4 EX-99.1 2 ex-a.txt EXHIBIT A