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CASE NARRATIVE <br /> CLIENT: CKY ENVIRONMENTAL SERVICES <br /> PROJECT: TRACY AUXILIARY AIRFIELD #8814 <br /> SDG: 95H 152 <br /> EPA 5030/M8015 - GASOLINE <br /> Nine soil samples were received on 08/30/95 to be analyzed for gasoline by <br /> 5030/M801 5 analysis in accordance with SW846 and Leaking Undergound Fuel Tank <br /> (LOFT) Field Manual, SWRCB, Dept. of Health Service, CA (1988). <br /> 1 . Holding Time <br /> Analytical holding time was met. <br /> 2. Surrogate Recovery <br /> All surrogate recoveries were within QC limits except sample H152-09 which <br /> had slightly lower recovery. The result was similar to that obtained from BTEX <br /> in which both surrogate recoveries in original and reanalysis were low. These <br /> data, taken together, strongly suggest matrix effect. Furthermore, since <br /> LCS/LCSD and MS/MSD were in control, no corrective action. <br /> 3. Matrix Spike/Matrix Spike Duplicate <br /> All recoveries and BPDs were within QC limits. <br /> 4. Lab Control Sample/Lab Control Sample Duplicate <br /> Recoveries were within QC limits. <br /> 5. Method Blank <br /> Method Blank was free of contamination. <br /> 6. Calibration <br /> Initial was five-point and continuing calibration were carried out at 10-sample <br /> interval. All QC requirements were met. <br /> 7. Sample Analysis <br /> Sample analyses were done within QC requirements. 01114 <br /> CXY INC.. ANALYTICAL UNBORATOR IES. 630 Naoie Ave.,Torrance.Waiif.90503 Tei.(310) 618-�SSc+ l=ax:13 10)613-08' <br />