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%... 1-. <br /> Regional Board Staff Recommendations 10 August 1990 <br /> Preliminary Site Investigation <br /> Based upon a Regional Board survey of Department of Health <br /> Services Certified Laboratories , the Practical Quantitation <br /> Reporting Limits are attainable by a majority of laboratories <br /> with the exception of diesel fuel in soils . The Diesel Practical <br /> Quantitation Reporting Limits, shown by the survey, are: <br /> Routine Modified Protocol <br /> s 10 ppm (42% ) s 10 ppm ( 10% ) <br /> s 5 ppm ( 19% ) s 5 ppm ( 21% ) <br /> s 1 ppm (35%) s 1 ppm ( 60% ) <br /> When the Practical Quantitation Reporting Limits are not <br /> achievable, an explanation of the problem is to be submitted on <br /> the laboratory data sheets <br /> 10 . SIGNED LABORATORY DATA SHEETS are to be submitted <br /> containing the laboratory' s assessment of the condition of <br /> the samples on receipt including temperature, suitable <br /> container type, air bubbles present/absent in VOA bottles, <br /> proper preservation, etc. The sheets must also include the <br /> dates sampled, submitted, prepared for analysis, and <br /> analyzed. <br /> 11 . PEAKS THAT DO NOT CONFORM to the standards must be reported <br /> by the laboratories, including any unknown complex mixtures <br /> that elute at times which vary from the standards . These <br /> mixtures may not compare to the standards and may not be <br /> readily identified; however, they are to be reported. At <br /> the discretion of the LIA or Regional Board the following <br /> information is to be contained in the laboratory report: <br /> • The relative retention time for the unknown peak(s ) <br /> relative to the reference peak in the standard; <br /> • Copies of the chromatogram(s ) ; <br /> • Type of column used; <br /> • Initial temperature; <br /> • Temperature program in °C/minute; and <br /> • Final temperature. <br /> 12 . REPORTING LIMITS FOR TPH are: gasoline standard s 20 <br /> carbons , diesel and jet fuel (kerosene) standard s 50 <br /> carbons . It is not necessary to continue the <br /> chromatography beyond the limit, standard, or EPA/DHS <br /> method protocol (whichever time is greater) . <br /> EPILOGUE <br /> ADDITIVES: Major oil companies are being encouraged or required <br /> by the federal government to reformulate gasoline as cleaner <br /> burning fuels to reduce air emissions . MTBE (Methyl-tertiary- <br /> butyl ether) , ETHANOL (ethyl alcohol ) , and other chemicals may be <br /> added to reformulated gasolines to increase the oxygen content in <br /> 19 <br />