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California Analytical Laboratory <br /> h <br /> ill . <br /> March 18, 1991 <br /> - <br /> - Alex Richards W- Ensec <br /> Kleinfelder, Inc. <br /> 9795 Business Park Drive iP <br /> Suite D <br /> Sacramento, CA 95827 � . <br /> Dear Alex: <br /> r <br /> Per our conversation concerning Enseco-Cal Lal projects 50084 and <br /> 54246, the following was determined: f <br /> 1. Lower the EPA Method 8020 reporting limit 13 for benzene, toluene, t <br /> ethyl benzene, and xylenes. <br /> Project 50084 - results for these compounds were reported as part <br /> of EPA Method 8240 with reporting limits 'at 5 ppb. <br /> Project 54246 - the reporting limits werel dropped by a factor of <br /> two (2) , amended datasheets are being prepared and will follow <br /> shortly. <br /> 2. Identification of unknown hydrocarbons fol sample 35868 - the <br /> amount of hydrocarbon was close to the reporting limit and <br /> determination based on patterning was notpossible. Results were <br /> based on diesel due to the carbon ranges present. { <br /> i <br /> 3. Oil and Grease solubility -- the percent solubility is unknown, the <br /> method indicates that the determination of a specific substance is <br /> not measured, but rather a group of substances with similar <br /> physical characteristics is determined quantitatively on the basis <br /> of their common solubility in trichlorotrifluoroethane. It should <br /> be noted that the method is not applicable to measurement of low- <br /> boiling fractions that volatilize at temperatures below 70°C. <br /> If you have any questions or if I can be of further assistance, please <br /> do not hesitate to call me. <br /> l� <br /> Sincerely, <br /> 'I <br /> Karen A. Verrue <br /> Program Administrator <br /> ll e <br /> Enseco Incorporated <br /> 2544 Industrial Boulevard <br /> West Sacramento,California 195691 <br /> 916/372-1393 Fax: 916/372-1059 <br /> V <br />