Occidental Petroleum 2009 Annual Report Download - page 113

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EXHIBIT 99.1
[Ryder Scott Company Letterhead]
January 29, 2010
The Board of Directors
Occidental Petroleum Corporation:
Ryder Scott Company compared Occidental’s methods and procedures for estimating oil and gas reserves to generally accepted industry standards and
reviewed certain pertinent facts interpreted and assumptions made by the engineering and geological staff of Occidental Petroleum Corporation for estimating
the proved reserves volumes, preparing the economic evaluations and determining the reserves classifications in accordance with United States Securities and
Exchange Commission (SEC) regulatory standards as of December 31, 2009. Ryder Scott reviewed the specific application of such methods and procedures
for selected oil and gas properties considered to be a valid representation of Occidental’s total reserves portfolio. The specific properties reviewed represent
approximately 20 percent of Occidental’s proved oil and gas reserves as of December 31, 2009. Since being engaged in 2003, Ryder Scott reviewed the specific
application of Occidental’s reserve estimation methods and procedures for approximately 71 percent of Occidental’s proved oil and gas reserves.
Based on our reviews, including the data, technical processes and interpretations presented by Occidental, it is our opinion that the overall procedures and
methodologies utilized in determining the proved reserves for the reviewed properties as estimated by Occidental are reasonable and consistent with generally
accepted industry standards and comply with current SEC standards. Ryder Scott has not been engaged to render an opinion as to the reasonableness of
reserves quantities reported by Occidental.
Very truly yours,
RYDER SCOTT COMPANY, L.P.
TBPE Firm Registration No. F-1580
/s/ John E. Hodgin
John E. Hodgin, P.G., P.E.
TBPE License No. 97667
President