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19 <br /> Concentrations of benzene in water samples were 11,000 ug/L at the 50 foot depth, 21,000 <br /> ug/L at the 60 foot depth, and 1,200 ug/L at the 70 foot depth At two additional successive <br /> depths, 80 and 90 R bgs, samples were attempted but not yield enough water to collect a <br /> ' sample <br /> Results for water sampling conducted with the Simulprobe6 and analyzed m the on- <br /> site mobile laboratory are summarized in Table 5-1 and illustrated on Figure 5-2 Detailed <br /> mobile laboratory results, fixed-lab MTBE confirmation results, QA/QC records, and Chain of <br /> Custody records for the field water sampling results are included in Appendix G <br /> 5.5 PERMEABILITY TESTING <br /> Samples were collected to test the vertical permeability of the soils beneath the 70 foot <br /> depth level, from the depths(at 80 and 90 feet bgs) at which insufficient water was collected to <br /> yield samples for laboratory analysis Upon arrival at the laboratory, it was determined that the <br /> samples had been disturbed during transport, had large gaps present near the sidewalls of the <br /> ' sample rings, and were inappropriate for conducting permeability testing Based on the <br /> disturbed condition of the samples, permeability testing on the samples was not conducted A <br /> letter from the hydrologic testing laboratory manager regarding the condition of the samples is <br /> included in Appendix H <br /> 5.6 FIELD QA/QC RESULTS <br /> Equipment blank water samples s (sample numbers EB 1-50 and EB2-90) were <br /> ' nondetect for TPHg,MTBE,BTEX compounds <br /> 1 The duplicate water sample taken (sample number DTP-1) was a blind duplicate of <br /> sample number NPI-60 For all compounds, the concentration reported for the sample was <br /> greater than the concentration reported for the duplicate Concentrations of the compounds <br /> detected at the laboratory to the duplicate samples are shown in the table below(in ug/L) The <br /> 1 <br />