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r� <br /> Knowles Gas station <br /> 202/799-5027.02 <br /> July 21, 1988 <br /> GROUNDWATER SAMPLING <br /> " <br /> prior to sampling, the monitoring wells were purged using <br /> hand bailing methods until stabilization of pH and conductivity <br /> ` j..� occurred. The stabilization of pH and conductivity indicates the <br /> w. presence of representative formation water within the well <br /> •i casing. Groundwater generated during the purging process was <br /> S stored on-site in DOT-approved containers for disposal at a later <br /> date. <br /> Subsequent to the purging process, groundwater samples were <br /> l <br /> - obtained from each monitoring well. The groundwater samples were <br /> collected using an: EPA approve <br /> Teflon sampler sampler and placed in 40 <br /> milliliter (ml) glass vials, 500 ml plastic bottles, and l litar <br /> (1) glass amber botC'les for laboratory analysis. The 40 ml glass <br /> L vials were capped with TeflonTM septum caps. in a manner such that <br /> _ no air:was trapped inside. In addition, the plastic bottles were <br /> pre-treated with nitric acid. The samples were labeled, <br /> preserved; and delivered with the appropriate Chain-of-Custody <br /> forms to GTEL for analysis. The groundwater samples were <br /> analyzed for the aforementioned parameters. <br /> SITE CONDITIONS <br /> r � <br /> HMROGEOLOGY <br /> �J1 <br /> The Knowles Gas Station is located in the San Joaquin <br /> Valley., which is within the Great Valley province of California.. <br /> ice? The Great Valley Province is bounded by the foothills of the <br /> i <br /> Sierra__Nevada_to _the east and the Coast Ranges on the wast• <br /> - ---- - T - <br /> � u - <br />