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2.0 GROUNDLTE h/i O IIIA'®WNG„FROC EIIDIRES <br /> On November 4, 1993, ]Environmental Science & Engineering, Inc. (ESE) staff, in the <br /> presence of Mr. Michael Infuma, of San Joaquin County Public Health Services <br /> Environmental Department (PHS-ED), measured water levels in wells SI-1, SI-2, SI-3 and <br /> UST-1 and purged and sampled well UST -1 (Figure 2). ESE first measured the static <br /> water level in the well using an electronic interface probe. Then, using a electric <br /> submersible pump, approximately 45 gallons of water were purged from the well. During <br /> the purging process, pH, temperature and conductivity were measured. The well purging <br /> was considered complete when a mu imum of three well volumes were evacuated, the final <br /> field measurements of pH, temperature and conditions were within 15 percent of the prior <br /> measurement, and the purged water was clear. The ground water sample was then collected <br /> from well UST-1 by lowering a new (precleaned) disposable polyethylene bailer in the well <br /> using new, disposable nylon cord. The filled bailer was retrieved, emptied, then filled again. <br /> The ground water from this bailer was then decanted into appropriate laboratory supplied <br /> glassware. The containers were filled such that no headspace was present in the samples <br /> in order to avoid volatilization of the sample. The filled sample containers were then <br /> labeled and placed in a cooler under ice for transport under chain of custody documentation <br /> to ES0s California certified laboratory in Peoria, Illinois ESE then documented the <br /> sampling procedures on the attached Well Sampling Field log (Attachment B). Purge water <br /> was stored in labeled drums and remains on site in a secure area of the site. <br /> A trip blank consisting of deionized water was provided by the ESE laboratory as a check <br /> on sample handling procedures. The tip blank accompanied the samples to the laboratory. <br /> I <br /> The ground water sample from UST-I and accompanying trip blank were analyzed at the <br /> laboratory for: <br /> F\69ZS4W\4QTRGwM RPT 3 Enm vnmenwl scene&Engmemog,Inc <br /> J <br />