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ti R Chevron D ;+� �Iwj i i° i;,� ll Chevron Corporation 576 Standard Avenue, Richmond, CA 94802-0627 June 23, 1988 ENVIkw+'t'.JAL Nc_ALTH EERMITlSERVICES Tracy Bioventing Emission Data Mr . Lakhmir Grewel Director, San Joaquin Air Pollution Control District 1601 East Hazelton Avenue Stockton, California 95201 Dear Mr . Grewel: Chevron has been conducting a bioventing field test in the Alden Park area of Tracy since May 24, 1988 . As part of this test, we are drawing air through soil that contains a heavy oil. The air is treated with activated carbon to remove nonmethane hydrocar- bons that evaporate from the oil and is then discharged to the atmosphere. In your letter authorizing the air discharge, you requested that we report hydrocarbon emissions and test results on a monthly basis. This letter is the first such report. We have measured 0.01 vol % of nonmethane hydrocarbons present in the air vented from the well at a flow rate of less than 3 ft3/minute (CFM) . This translates to less than 0.095, lb/day of nonmethane hydrocarbon vented from the well. The vented air is then combined with atmospheric air and treated with activated carbon to reduce further below 0.095 lb/day (this is about the expected detection limit for the exhaust air) . The hydrocarbon level of 0.01% in the well is as expected. The flow rate has been relatively low to date as we start the test at a low vacuum in the well. We plan to increase the vacuum to achieve higher flow rates and will report the results next month. We had estimated 0.1-1.5 lb/day of nonmethane hydrocarbon would be emitted during the test. Actual emissions are below these estimates. If you have any questions on the emission informa- tion, please contact me at ( 415) 620-3171 . Sincerely yours, L C— D. L. Ely DLE:dt cc: Mr . D. Carls Mr . D. L. Brent