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CASE NARRATIVE <br /> CLIENT: CKY ENVIRONMENTAL SERVICES <br /> !PROJECT: TRACY AUXILIARY AIRFIELD #8814 <br /> SDG: 95H152 <br /> EPA METHOD 8020 <br /> BTEX <br /> Nine (9) soil samples were received on 08/30/95 to be analyzed for Aromatic volatile <br /> organics (BTEX) by GC in accordance with DSEPA SW846. <br /> 1 . Holding Time <br /> Analytical holding time was met. <br /> 2. Surrogate Recovery <br /> All surrogate recoveries were within QC limits except for samples H1 52-08 & <br /> H152-09. These two samples were reanalyzed and surrogate recoveries were <br /> still below QC limits. Matrix effect was suspected. Chromatograms of these <br /> analyses were enclosed. <br /> 3. Matrix Spike/Matrix Spike Duplicate <br /> All recoveries and RPD were within QC limits. <br /> 4. Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> All recoveries were within QC limits. <br /> 5. Method Blank <br /> Method blank was free of contamination. <br /> 6. Calibration <br /> Initial calibration was at five point. Daily calibration was carried out at the <br /> beginning of the analytical sequence, then at 10 sample intel^val and at the end <br /> of the analysis. All QC requirements were met. <br /> 7. Sample Analysis <br /> All sample analyses were done within QC requirements with -the above <br /> mentioned exception. Q <br /> `T CKY INC., ANALYTICAL LABORATORIES. 630 Maple Ave..Torrance.Calif.90503 Tel.(310)618-8889 Far:(310)618-0818 <br />