North America Crude Oil Marketing - May 2010 Summary California Bulletins 10-CA83 to 10-CA102, with Monthly Averages

Chevron has changed its posted prices as shown below: Effective 7:00 AM on the above listed effective date, subject to change without notice, Chevron will pay the following prices per barrel for crude oil and condensate delivered for its account into the custody of its authorized carrier or receiving agent. Prices are subject to deduction for transportation and other charges where applicable. Prices for oil apply to quantities measured by approved automatic custody transfer facilities or 100% tank table with customary adjustment of volume and gravity for temperature and full deduction for sediment and water.

* Prices are subject to a Gravity Adjustment Scale

California	API	CA83 05/03	CA84 05/04	CA85 05/05	CA86 05/06	CA87 05/07	CA88 05/10	CA89 05/11	CA90 05/12	CA91 05/13	CA92 05/14	CA93 05/17
Buena Vista Hills		83.75	80.30	77.55	74.65	72.65	74.35	73.90	73.20	71.95	69.15	67.85
Coalinga		78.90	75.45	72.70	69.80	67.80	69.50	69.05	68.35	67.10	64.30	62.80
Huntington Beach		77.85	74.40	71.65	68.75	66.75	68.45	68.00	67.30	66.05	63.25	61.80
Kettleman Hills		86.90	83.45	80.70	77.80	75.80	77.50	77.05	76.35	75.10	72.30	71.15
Lost Hills		85.30	81.85	79.10	76.20	74.20	75.90	75.45	74.75	73.50	70.70	69.50
McKittrick		78.20	74.75	72.00	69.10	67.10	68.80	68.35	67.65	66.40	63.60	62.05
Midway Sunset		78.20	74.75	72.00	69.10	67.10	68.80	68.35	67.65	66.40	63.60	62.05
Seal Beach		82.20	78.75	76.00	73.10	71.10	72.80	72.35	71.65	70.40	67.60	66.35

California	API	CA94 05/18	CA95 05/19	CA96 05/20	CA97 05/21	CA98 05/24	CA99 05/25	CA100 05/26	CA101 05/27	CA102 05/28		Mthly Avg
Buena Vista Hills		67.20	67.65	65.80	67.85	68.00	66.55	69.30	72.35	71.75		72.1839
Coalinga		62.15	62.60	60.75	62.80	62.95	61.50	64.25	67.30	66.70		67.2371
Huntington Beach		61.15	61.60	59.75	61.80	61.95	60.50	63.25	66.30	65.70		66.2113
Kettleman Hills		70.50	70.95	69.10	71.15	71.30	69.85	72.60	75.65	75.05		75.4065
Lost Hills		68.85	69.30	67.45	69.50	69.65	68.20	70.95	74.00	73.40		73.7823
McKittrick		61.40	61.85	60.00	62.05	62.20	60.75	63.50	66.55	65.95		66.5129
Midway Sunset		61.40	61.85	60.00	62.05	62.20	60.75	63.50	66.55	65.95		66.5129
Seal Beach		65.70	66.15	64.30	66.35	66.50	65.05	67.80	70.85	70.25		70.6581

Note: Prices in $/bbl

Measurement The prices are based upon computation of quantities by mutually acceptable automatic measuring equipment in accordance with the latest ASTM Standards and API Manual of Petroleum Measurement Standards (MPMS) generally accepted in the petroleum industry with deductions for full sediment, water and other impurities.