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ss' i <br /> P': 12: 21 a o <br /> Port of Stockton <br /> General Offices: P.O. Box 2089, Stockton, CA 95201-2089 <br /> (209) 946-02461 FAX (209) 465-7244 or(209) 466-5986 <br /> August 26, 1998 <br /> Transmitted Via Facsimile 209-464-0138 <br /> Ms. Carol Ox, REHS <br /> Environmental Health Specialist <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE: Analysis of Oxygenates on Soil and Groundwater Samples, Initial Subsurface <br /> Investigations for Petroleum Hydrocarbons, Port of Stockton <br /> Dear Ms. Oz: <br /> This letter is a follow-up to your telephone conversation with our environmental <br /> consultant, Mr. Philip Ross of Boyajian & Ross, Inc., on August 20, 1998, regarding the <br /> subject analyses. Mr. Ross had called to inquire whether the oxygenate TBA was an essential <br /> analyte for the EPA 8260 scan, as the analytical laboratory had informed him that they were <br /> having some difficulty with calibrating for TBA and might have to send the sample to another <br /> laboratory for that particular analyte. The main concern was that sending out the sample might <br /> exceed the holding time for the TBA analysis. You indicated that San Joaquin County Public <br /> Health Services/Environmental Health Division (SJCPHS/EHD) had seen TBA at several sites <br /> in the county, and that you would like to see it run_ The following day, the laboratory called <br /> Mr. Ross and said that they had resolved their calibration difficulties and that all EPA 8260 <br /> analyses would include TBA. <br /> During your conversation with Mr. Ross, he mentioned the fact that the EPA 8260 <br /> analyses were only being run on those samples that showed a positive result for MTBE <br /> utilizing EPA method 8020. At that time, you indicated that you require all samples <br /> associated with potential gasoline impact to be analyzed for oxygenates by EPA 8260. As <br /> Mr. Ross noted, Section 3.2 of the approved work plans for the Port of Stockton sites <br /> explicitly stated "Samples will be analyzed for BTEX, TPHg, and MTBE using EPA methods <br /> 802018015.... If MTBE is detected in a sample using EPA method 8020, that sample will be <br /> run for oxygenates utilizing EPA method 8260." You indicated to him that approval of the <br /> work plans with that statement was an oversight, and that the SJCPHS/EHD requires EPA <br /> GENERAL OFFICE: 2201 W. WASHINGTON ST., STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA <br />