North America Crude Oil Marketing - December 2005 Summary East of the Rockies Bulletins 05-E234 to 05-E254, with Monthly Averages

Chevron has changed its posted prices as shown below: Effective 7:00 a.m. on the date(s) indicated, and subject to change without notice and subject to the terms and conditions of its division orders or other contracts, Chevron will pay the following prices ($/bbl) for oil at 40.0° API and above, except as noted below, delivered into pipelines for its account into the custody of its authorized carrier or receiving agent. The posted prices for crude oil transported by truck or barge will be the following prices less appropriate trucking or barge cost. The posted prices for crude oil received off shore will be the following prices less appropriate transportation and quality costs to get the crude on shore. Regarding technical issues of Chevron's most recent posted prices, call Christine Mathwig 832-854-5159. POSTINGS WILL BE DISCONTINUED AS OF 8/1/19

* Prices are subject to a Gravity Adjustment Scale

East of the Rockies	E234 12/01	E235 12/02	E236 12/05	E237 12/06	E238 12/07	E239 12/08	E240 12/09	E241 12/12	E242 12/13	E243 12/14	E244 12/15	Gvty Adj*
Altamont Yellow Wax	57.47	58.32	58.91	58.94	58.21	59.66	58.39	60.30	60.37	59.85	58.99	B
Bonito Sour (Onshore)	54.75	55.50	56.25	56.25	55.50	57.00	55.50	57.50	57.50	57.00	56.25	A
Deepwater Sour (Onshore) (30�)	50.75	51.50	52.25	52.25	51.50	53.00	51.75	53.50	53.50	53.00	52.25	F,G
East Texas	55.00	55.75	56.25	56.25	55.50	57.00	55.75	57.75	57.75	57.25	56.25	none
Eugene Island Sour (Onshore)	54.50	55.25	55.75	56.00	55.25	56.50	55.25	57.25	57.25	56.75	56.00	A
Heavy Louisiana Sweet (Onshore)	55.75	56.50	57.25	57.25	56.50	58.00	56.75	58.50	58.50	58.00	57.25	A
Light Louisiana Sweet (Onshore)	57.75	58.50	59.25	59.25	58.50	60.00	58.75	60.50	60.75	60.25	59.25	A
New Mexico Intermediate	57.72	58.57	59.16	59.19	58.46	59.91	58.64	60.55	60.62	60.10	59.24	none
New Mexico Sour (34�)	52.19	53.04	53.63	53.66	52.93	54.38	53.11	55.02	55.09	54.57	53.71	none
North Texas Sweet	55.25	56.00	56.50	56.50	55.75	57.25	56.00	58.00	58.00	57.50	56.50	none
Oklahoma Sour	52.19	53.04	53.63	53.66	52.93	54.38	53.11	55.02	55.09	54.57	53.71	none
Oklahoma Sweet	57.63	58.48	59.07	59.10	58.37	59.82	58.55	60.46	60.53	60.01	59.15	none
South Texas Light Sweet	53.25	54.00	54.50	54.50	53.75	55.25	54.00	56.00	56.00	55.50	54.50	none
Southwest Wyoming Sweet	59.52	60.37	60.96	60.99	60.26	61.71	60.44	62.35	62.42	61.90	61.04	E
Uinta Basin Black Wax	53.72	54.57	55.16	55.19	54.46	55.91	54.64	56.55	56.62	56.10	55.24	B
West Texas Intermediate	55.25	56.00	56.50	56.50	55.75	57.25	56.00	58.00	58.00	57.50	56.50	none
West Texas Sour (34�)	50.50	51.25	51.75	51.75	51.00	52.50	51.25	53.25	53.25	52.75	51.75	none
Western Colorado	59.26	60.11	60.70	60.73	60.00	61.45	60.18	62.09	62.16	61.64	60.78	B

East of the Rockies	E245 12/16	E246 12/19	E247 12/20	E248 12/21	E249 12/22	E250 12/23	E251 12/27	E252 12/28	E253 12/29	E254 12/30	Gvty Adj*	Mthly Avg
Altamont Yellow Wax	57.06	56.34	56.98	57.56	57.28	57.28	57.16	58.82	59.32	60.04		58.2797
Bonito Sour (Onshore)	54.25	53.50	54.25	54.75	54.50	54.50	54.50	56.00	56.50	57.25		55.4919
Deepwater Sour (Onshore) (30�)	50.25	49.50	50.25	50.75	50.50	50.50	50.50	52.00	52.50	53.25		51.5161
East Texas	54.50	53.75	54.50	55.00	54.75	54.50	54.50	56.25	56.75	57.50		55.6613
Eugene Island Sour (Onshore)	54.00	53.25	54.00	54.50	54.25	54.25	54.00	55.75	56.25	57.00		55.2177
Heavy Louisiana Sweet (Onshore)	55.25	54.50	55.25	55.75	55.50	55.50	55.50	57.00	57.50	58.25		56.5161
Light Louisiana Sweet (Onshore)	57.25	56.75	57.25	57.75	57.50	57.50	57.50	59.00	59.50	60.25		58.5403
New Mexico Intermediate	57.31	56.59	57.23	57.81	57.53	57.53	57.41	59.07	59.57	60.29		58.5297
New Mexico Sour (34�)	51.78	51.06	51.70	52.28	52.00	52.00	51.88	53.54	54.04	54.76		52.9997
North Texas Sweet	54.75	54.00	54.75	55.25	55.00	54.75	54.75	56.50	57.00	57.75		55.9113
Oklahoma Sour	51.78	51.06	51.70	52.28	52.00	52.00	51.88	53.54	54.04	54.76		52.9997
Oklahoma Sweet	57.22	56.50	57.14	57.72	57.44	57.44	57.32	58.98	59.48	60.20		58.4397
South Texas Light Sweet	52.75	52.00	52.75	53.25	53.00	52.75	52.75	54.50	55.00	55.75		53.9113
Southwest Wyoming Sweet	59.11	58.39	59.03	59.61	59.33	59.33	59.21	60.87	61.37	62.09		60.3297
Uinta Basin Black Wax	53.31	52.59	53.23	53.81	53.53	53.53	53.41	55.07	55.57	56.29		54.5297
West Texas Intermediate	54.75	54.00	54.75	55.25	55.00	54.75	54.75	56.50	57.00	57.75		55.9113
West Texas Sour (34�)	50.00	49.25	50.00	50.50	50.25	50.00	50.00	51.75	52.25	53.00		51.1613
Western Colorado	58.85	58.13	58.77	59.35	59.07	59.07	58.95	60.61	61.11	61.83		60.0697

Note: Prices in $/bbl

Measurement The prices are based upon computation of quantities by mutually acceptable automatic measuring equipment in accordance with provisions of API Standard 1101 or from 100% tank tables with corrections of volume and gravity for temperature to 60°F in accordance with ASTM D-1250 and supplements thereto, if any, and with deductions for full sediment, water and other impurities. Only merchantable oil acceptable to the receiving agency designated by Chevron and containing not more than 1% sediment and water will be accepted.