R2003-93 AUTHORIZING EXECUTION OF AGREEMENT

Home Browse Search

Decatur,City of,Mound School Bodine Project#114675 Phase II Subsurface Investigation Report August 29 2003 containers. Sample containers were immediately sealed, labeled and placed into a cooler containing blue ice. Sample identification number correspond directly with the boring locations indicated on Figure 1. On July 28, 2003,the samples were relinquished to PDC Laboratories, Inc. courier under the Chain of Custody. Samples arrived at the laboratory and were logged into the laboratory system on August 28, 2003. Pursuant to the Service Agreement,the laboratory conducted the analysis of the samples for BTEX and PAHs. Bodine received the laboratory report, with the original Chain of Custody on August 13, 2003, see Attachment B. 3.3 Data Review: Bodine completed a review of the data for samples B3,B5, B6, B8, B9 and B11. All samples for BTEX and PAH compounds were reported by the laboratory as not detected at the laboratory reporting limit. The laboratory report, Attachment B, indicates reporting limits and concentrations for both dry weight and wet weight measurements. According to regulatory guidelines, sample results reported as dry weight are to be used to compare to the IEPA TACO Soil Remediation Objectives (SROs). Bodine has included a Table 1 summarizing the laboratory reported concentrations. The laboratory reported qualifications in samples identified as B3, B8 and B9. Qualifications for Benzene reported concentrations below the reporting limit were indicated to have surrogate recoveries which failed to meet the required acceptance criteria in the initial analysis. The samples were re-extracted beyond the maa�imum allowable holding time and re-analyzed. The surrogate recovery for the second analysis was also outside the required acceptance criteria. The results should be interpreted as estimated concentrations. However,the estimated concentrations should be biased high and the actual concentration would be lower than the reported value. Sample B3 was also qualified with a R value for the Indeno(1,2,3-cd)pyrene compound. This qualification indicates the analyte failed to meet the required acceptance criteria for relative percent difference (RPD)between the Matrix Spike and Matrix Spike Duplicate (MS/MSD). The reported sample concentration should be considered usable at the reported value. The correlation between the laboratory's internal standards does not affect the quality of the reported data and may be a direct result of matrix effects. 3.4 Findings & Conclusions: Based upon review of the laboratory reported concentrations for BTEX and PAH analysis, Bodine finds that all locations indicate concentrations below the laboratory reporting limits and below the IEPA TACO Tier 1 SROs. The laboratory reported concentrations do not indicate a release has occurred. 4 BUnINE�NVIRONMENTAI SERVICES, INC.