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I - <br /> CHRQMALAB, INC. Submission#: 2000-03-0366 <br /> Environmental Services(SDB) Date: March 28, 2000 <br /> To: CH2M Hill-Oakland <br /> Attn.: Keith Sheets j <br /> CASE NARRATIVE <br /> h <br /> General and Sample Comments <br /> We(ChromaLab, Inc.)received 3 Water samples, on Mar 20 2000 2:5013M. <br /> GasIBTEX <br /> Recoveries for Lab Control Standard and Duplicate were outside our standard limits for <br /> Benzene,Toluene, and Ethyl Benzene. Also,continuing calibration verification sample(CCV) <br /> showed similar characteristics. Sample could not be re-analyzed due to limited sample. 1 <br /> Results for these three compounds are estimated. Estimated results are supported by similar <br /> data from GC/MS analysis run on the samples. . <br /> Test results for Gasoline and xylenes are within standard limits, and are not estimated. <br /> Analysis Comments and Flags by QC Batch <br /> Gas BTEX Water QC Batch#:2000103125.01-05 } <br /> Method Blank Lab#:2000103125.01-05-004 <br /> Btex concentrations are estimated ND due to a failing purgable CCV <br /> Laboratory Control Spike Lab#:2000103125.01-05-005 <br /> Btex concentrations are estimated due to ccv failing <br /> Laboratory Control Spike Duplicate Lab#:2000103125.01-05-006 <br /> Btex concentrations are estimated due to ccv failing <br /> CPT-14(110`) Lab#:2000-03-0366-001 <br /> Analysis Comment ! . <br /> c-The concentrations reported for Benzene,Toluene, and Ethyl Benzene are estimated due { <br /> to low batch spike recoveries. Insufficient sample to reanalyze. <br /> CPT-14(94) Lab#:2000-03-0366-002 <br /> c-The concentrations reported for Benzene,Toluene,and Ethyl Benzene are estimated due <br /> to low batch spike recoveries. Insufficient sample to reanalyze. <br /> Compound Flag(s) <br /> 9 Hydrocarbon reported in the gasoline range does not match our gasoline standard. <br /> II <br /> { <br /> 1220 Quarry Lane`Pleasanton,CA 945664756 <br /> Telephone:(925)484-1919'Facsimile:(925)484-1096 <br /> Printed on:03/28/2000 17:18 Page 2 Of 2 <br />