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❑ GT ENVIRONMENTAL LABORATORY <br /> ❑� ANALYTICAL d CONSULTING SERVICES <br /> Dkision ct Oil Recovery Systems, Inc. <br /> P. O. Box 541, Greenville,NH 03048 <br /> Tel: (603) 878-2500 <br /> 10/6/86 <br /> Report No. 20-2894--7 Robert J uncal <br /> Submitted to: <br /> Groundwater Technology <br /> 4080 Pike Lane <br /> Concord , CA. 94520 <br /> Sample Identification: <br /> The attached report covers water samples #31564-31569 taken by E. <br /> M. using 40mL septum—capped glass vials at Site #20-2894 , <br /> Stockton California. <br /> Method: pollutants <br /> Analysis was per <br /> for purgeable aromatic priority p <br /> and xylenes by purge and trap gas chromatography with <br /> photoion3zation and flame ionization detection as per EPA Method <br /> 602, Quantification was performed on a very polar column which <br /> fractionates aliphatics (up to C12) away from volatile aromatics. <br /> re referenced in GTL Method Code 110. <br /> Chromatographic conditions a <br /> Hexane and orthoxylene are used as calibration standressectivelye <br /> aliphatic hydrocarbons and miscellaneous aromatics, p <br /> Minimum Detection Limit (MDL) at 5 times background is 0.5 ppb <br /> for all parameters. The level for reliable quantitation for the <br /> summed groups such as aliphatics is 20 ppb. Samples diluted in <br /> order to maintain the calibrated range are so indicated by a <br /> footnote giving the factor by which the HDL is raised. <br /> Sampling and sample handling and preservation are specified by <br /> this thod 602. Any irregularities <br /> laboratory to be as per EPA Me <br /> are referenced as notes to the analytical report. <br /> Results: <br /> Results are reported in ppb (ug/1) <br /> Prepared by: S.E.B. <br /> Bob Edwards Analyst <br /> Marmger <br /> c <br />