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Chevron p I�� \ I' <br /> Chevron Corporation O <br /> 576 Standard to Avenue, Richmond, CA 94802-0627 <br /> 7-13 <br /> July 25, 1988 <br /> ENVIRCnnEwTAL HEALTH <br /> V ERiv117/SERVICES <br /> Tracy Bioventing Emission Data <br /> Mr . Lakhmir Grewel <br /> Director, San Joaquin Air <br /> Pollution Control District <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> Dear Mr . Grewel : <br /> Chevron has been conducting a bioventing field test in the <br /> Alden Park area of Tracy since May 24, 1988 . We reported to you <br /> last month (June 23) that air emissions from the test are well <br /> below the estimated levels, in part due to the low flow rates we <br /> were operating the test at. This letter is our second monthly <br /> report to you on air emissions and test results. <br /> In this last month we were able to increase the operating flow <br /> rate for short periods of time. We intend to run at these flow <br /> rates for longer durations when given approval by the City of <br /> Tracy to remove water from the well (required to sustain the <br /> higher flows) . The short tests (only a few minutes long) were <br /> insufficient to measure either venting ' s effectiveness at the <br /> higher flow rates or sustained emission levels. <br /> At the lower flow rate of less than 3 ft3 per minute we have now <br /> measured up to 0 . 03 vol % of nonmethane hydrocarbons (NMHC) <br /> present in the air drawn from the well. This is slightly higher <br /> than the 0 . 01% measured the previous month, and translates to <br /> less than 0 . 29 lb/day NMHC. The air from the well is combined <br /> with atmospheric air and treated with activated carbon to reduce <br /> emissions to the atmosphere. Measured emissions of NMHC to the <br /> atmosphere are less than 1 ppm by volume, which is less than <br /> 0. 06 lb/day. <br /> We had estimated 0 . 1-1 . 5 lb/day of NMHC would be emitted during <br /> the test . Actual emissions are again below these estimates. If <br /> we are given approval for the water removal and longer-term tests <br /> at higher flow rates, we will report those results to you next <br /> month. Please contact me at ( 415) 620-3171 if you have any ques- <br /> tions on this emission information. <br /> Sincerely, <br /> D. L.'Ely <br /> cc: Mr . David R. Carls <br /> Mr . David L. Brent <br />