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_ MEMORANDUM <br /> Date: January 14, 1993 <br /> To: Melody L. Allen, Projact Manager <br /> -- From: RobeR Salisbury,Staff Chemist <br /> Subject: Data Validation Review <br /> TPH 418.1 M Soil Data <br /> City of&vecett Ptoposed Notth-Esst View Park, Q3352-021-005 <br /> TLe data vdidation review of 5 soil semples collected on Dacember 4 through 7, 1992 has baen completed. <br /> - The samplas wero analymd for WW petmlwm hydrocarbons (1'PFn i�ervier than diesel by D&M Lbontories <br /> (DdcM) located in Petelum�, Glifomia. 1Le awlyses wero performed using method W7'PH 418.1 Modifad in <br /> �ccoedance with Appeadi�c L of the Guidance far Remedia6on of Relasas From Undwground SWraga Tanks <br /> _ (WashingWn DquRmeat of Hcology, April, 1992). Summaries of the sample dab and I�bontory QC data wore <br /> provided by D&M. 'Ihe following samples aro as5ociated wiW labontory case ucaber (or accession number) <br /> 923530: <br /> " Samole Number D&M Number <br /> T:-1-1 30624 <br /> TP-2-1 30626 <br /> TP-3-1 30628 <br /> HA-5 30639 <br /> HA-6 30640 <br /> The following comments refer to D3cM's performance in meeting the quality control specifications <br /> � described in Appendix L of 16e Was6ingtor. DOE document "Guidance for Remediation of Releaces From <br /> Undergrouad Storage Tanks," April, 1992. <br /> 1. Holding Time - Acceptable <br /> 2. Blanks- Acceptable <br /> ✓ 3. Lborz!ory Duplicate Analysis <br /> „r Sampla TP-3-1 w�as usad for duplicate analysis. The relative percent difference (RPD)was 243%. Tf�e <br /> method does aot specify quality control limits for duplicate sample analysis, therefore the sample data were not <br /> , qualified based on the results of the duplicate analysis. <br /> "' 4. Sampla Results Verification <br /> Tha lab reportod that total recoverable petroleum hydrocarbons were not detected above the instcument <br /> .� detection limits(50 mg/kg)in samples HA-5 and HA-6. Results of the WTPH HCID analysis,however, indicatul <br /> that petroleum hydracnrbo�s in the motor oil range were detected in HA-5 and HA-6 at a concentration equal to <br /> or exceeding?.00 rog/kg. Based ou the results Crom the TPH-HC[D analysis, the detection limits for samples HA-5 <br /> and HA�were flagged UJ. <br /> 5. Reported Detection Linuts-Acceptable <br />