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- MEMORANDUM <br /> _ Date: M�roh 12, 1993 <br /> To: Melody L. 111ea, Projeot Mmager <br /> — From: RobeR Salisbury, Staff Chemist <br /> Subject: Data Validation Reviaw <br /> - TPH-D Soil Data <br /> City of Everett Propoaed North-East View Park, 03352-021-005 <br /> '1Le data validation review of 2 soil sunples collacted on Febnury 2, 1993 has baeu completed. T6e <br /> samples wero analyud for Wul peholeum hydrourboos(TPI-n in the diesel nnge by DBcM Laboratories(D&M) <br /> located in Petalums,Gdifomia. 'Ihe analysis wu perfo�med using mUhod WTPH-D in acco�dance with Appendix <br /> L of the Guidance for Remediation of Rdeases From Underground SWnge Tanks (W�shington Departmeat of <br /> - Ecology, April, 1992). Summaria of the sample data aod laboratory QC da4 wem provided by DBeM. 'P�e <br /> following samples are associated with labonWry ase numbor(or accessiun number)930258: <br /> Sample Number D&M Number <br /> TP-3A-1 34786 <br /> TP-3A-2 34787 <br /> T6e following commeats rofer to D3eM's perforn�ance in meCting the quality control spacifications <br /> described in Appwdix L of the Washington DOE document "Guidance for RemediaUon of Releases From <br /> . Underground Storage Tanks,' Aprtl, 1992. <br /> - l. HolJing Time- Acceptable <br /> ' 2. Blanks - Accopteble <br /> 3. Surtogate Recovery - Acceptrble <br /> � 4. 7�botatory Duplicate Analysis <br /> _, Sample TP-3A-2 was used for the duplicate sample analysis. The relative percent difference (RPD)wes <br /> 24.0%. T6e method does not specify quality control limits fcr duplicate sample analysis, Iherefore tha ssmple <br /> •-' results wero not qualified based on results of the duplicate analysis. <br /> 5. Reportad Detection Limits-Acceptable <br /> 6. Type of Data Validation Review- Summary <br /> 7. Overall Assessment of Data <br /> The usefulness of the data is besai on the Ecology guidence document listed above. Upon consideretion <br /> of the information presented above, the data are acceptabla except where flagged with data qualifiers which modify <br /> the usetulness of the individual values. <br /> i � <br /> � <br /> I — <br /> i <br /> i <br />