SITE INFORMATION AND CORRESPONDENCE

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Chevron • • Chevron Corporation J� 576 Standard Avenue, Riornond, CA 94802-0627 February 8, 1988 Mr . Seyed Sadredin San Joaquin Air Pollution Control District P.O. Box 2009 Stockton, California 95201 Dear Mr. Sadredin: We plan to run a three-month test at Alden Park in Tracy. We hope to stimulate natural biodegradation of the oil at this site using soil venting as shown in Attachment 1. We believe air quality threshold limits will not be exceeded by our short test. We request your written concurrence and approval to proceed. If this test is successful, emission data collected will be used to apply for an air permit for a full scale, long-term system. Following is a discussion of anticipated test conditions and our planned air emission monitoring program. For more details please refer to the references previously sent to your colleagues, David R. Carls and Laura Cotulla. We have estimated that there will be approximately 5 lb/day of nonmethane hydrocarbon in the gas removed from the soil prior to treatment (see Process Flow Diagram, Attachment 2) . This gas will be treated with activated carbon to control emissions between 0 .1 and 1. 5 lb/day of nonmethane hydrocarbon. These estimates will be confirmed by the test . We are confident the carbon will effectively remove nonmethane hydrocarbon. We will sample both the treated gas and the gas within the carbon bed periodically to monitor concentrations and avoid breakthrough. We will run an analysis of the vented gas for hydrocarbon speciation and calculate emissions in lb/day. The carbon will be replaced as needed. The field test is tentatively scheduled to begin the first week in April . If we exceed expected emissions during the test we will notify you promptly. We will report the actual emission data to you after the test is completed. qi �2 FEB 11 19K ENVIROMENTAL HEALTH FERMIT/SERVICES