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• ARCADIS GERAGHTY&MILLER <br /> MTBE was not detected in soil samples, using the EPA Method 8020 above a <br /> P <br />' practical quantification limit(PQL)of 005 mg/kg at any depth sampled <br />' Detailed mobile laboratory results, fixed-lab MTBE confirmation results, QA/QC records, and <br /> Chain of Custody records for the field soil sampling results are included in Appendix F <br />' 5.4 FIELD GROUNDWATER CHEMICAL ANALYTIC RESULTS <br />' 5 4.1 Boring NP-1 <br />' Attempts were made to collect groundwater samples at 10 foot depth intervals <br /> between 30 and 110 feet bgs, inclusive, using the Simulprobe sampling device Samples were <br /> successfully collected at the depths of 32, 50, 60, 70, 80, 90, 100, and 110 ft bgs (Table 5-1, <br /> Figure 54) Insufficient quantities of water were collected, over the 30 minute collection time <br />' period, at sample depths of 40 and 119 ft bgs, due to lack of formation yield <br />' Concentrations of TPHg (EPA Method 8015) in water samples collected at discrete <br /> depths in NP-1 were greatest at 70 ft depth (73,000 ug/L) TPHg concentration in water <br />' collected at the 60 ft depth (71,000 ug/L) was similar to that at the 70 ft depth, and <br /> corresponds to the depth at which the highest concentration of TPHg in soil was detected <br />' TPHg concentrations in samples collected below the 70 ft bgs depth decreased sequentially <br />' with depth down to a concentration of 660 ug/L in the sample collected at the 90 ft depth The <br /> TPHg concentration in the collected samples increased to 700 ug/L at the 100 ft depth and <br />' further to 2,500 ug/L at the 110 ft depth <br />' BTEX compounds were detected (EPA Method 8020) in the water samples collected <br /> from all of the depths at which samples were attempted and the formation yielded sufficient <br /> water to conduct analysis The maximum concentration of benzene in groundwater was <br />' 24 <br />