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reae •_� r - , 4 � � <br /> . Afn <br /> N C <br /> JAN 101992111 <br /> January 6, 190,_ NVIRONMENTAL HEALTH <br /> PeRm If/9ERWICES <br /> Mr Marc Schaunhoff <br /> San Joaquin County <br /> Air Pollution Control District <br /> P O Box 2009 <br /> 2321 W Washington Street, Suite I <br /> Stockton, California 95201 <br /> Subject Soil Biological Remediation, 6540 E Jahant Road, Acampo, California <br /> Dear Mr Schaunhoff, <br /> Pursuant to our previous discussions regarding the Volatile Organic Compound (VOC) emissions <br /> Tek Inc <br /> s conducted a <br /> from the subject remedial program, <br /> in order to demonstrate agreater t )han90aperce t emission containment tical VOC <br /> emission survaf <br /> The mathematical evaluation was based on the information contained in the enclosed technical <br /> article prepared by Paul C Johnson, Marvin B Hertz and Dallas L Byers of Shell Development, <br /> • Westhollow Research Center, Houston, Texas (Attachment 1) This article entitled `Estimates for <br /> Hydrocarbon Vapor Emissions Resulting from Service Station Remediations and Buried Gasoline - <br /> Contaminated Soils" provides detailed methodology for estimating the VOC emissions based on <br /> known site parameters and scientific principles The article also demonstrated that actual laboratory <br /> experimental results confirm the calculated emission rates Therefore, TreaTek feels that the <br /> Information obtainedcualbs to conditions s and can, therefore, demonstrate thethe estimated VOC emission rates n the expected lect VOC emission <br /> will <br /> emiss on <br /> closely parallel a <br /> containment percentage <br /> By incorporating the known site conditions (i e , temperature, density, compound concentrations, <br /> he <br /> tions <br /> in the attached <br /> Tek was <br /> etc) for calculate the estimated VOCJahant Road Site into emissionsfrom the soils dfor a desired duration All car <br /> able to ca calculations <br /> are enclosed in Attachment 2 <br /> For the purpose of this evaluation,TreaTek calculated the one-hour VOC emission rate The weekly <br /> rate for an uncovered pile was then estimated as was the four hour emission rate which is the <br /> approximate duration for which the stockpiled soils would be uncovered during an individual week <br /> In order to compensate for VOC emissions via potential gaps in the plastic covering the soils, a 100 <br /> percent contingency rate was used for the four hour VOC emission rate <br /> By comparing the uncovered weekly VOC emission rate with the covered VOC emissions rate, it can <br /> be demonstrated that the project's soil stockpile VOC emission containment is approximately 95 2% <br /> This containment percentage is well above the 90% containment mandated by your agency Special <br /> mention should be made that these calculations are based on the initial compound concentrations <br /> which will be rapidly reduced through the biological degradation process <br />