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Libbev Owens Ford Co. <br /> Product Recovery System Installation <br /> June 33. 1997 <br /> Page-9- <br /> phosphate detergent and hydrocarbon-free water, and double-rinsing with hydrocarbon-free water. The <br /> purge water discharged from the wells during development will be placed in 55-gallon drums, sealed, <br /> labeled, and left on site to await disposal pending results of laboratory analysis. . <br /> 4.4 Well Collar Survey <br /> A survey will be conducted by a licensed professional surveyor to determine the location and <br /> relative elevation of the well collars following the installation of the monitor wells and product <br /> recovery wells. The well collars will be surveyed with a vertical accuracy of 0.01 foot and horizontal <br /> accuracy of 1.0 foot. The measuring point for water-level measurements will be marked on each well <br /> collar. The groundwater gradient will be estimated using the survey information and the depth to <br /> water measurement in each well. <br /> 4.5 Groundwater Samplin.- <br /> Groundwater samples will be collected at least 24 hours following development of the monitor <br /> wells. Prior to sample collection, the static water level in each well will be measured to the nearest <br /> 0.01-foot with a battery-operated water-level meter. A disposable bailer will be lowered into each <br /> well to check for floating product, petroleum odors and/or sheen. <br /> The monitor wells will be purged using a clean submersible pump or bailer until the <br /> temperature, electrical conductivity and pH of the water has stabilized. At least 3 casing volumes of <br /> _water will be purged from each monitor well. The purged water from each well will be containerized <br /> in a 55-gallon drum and left on site pending analytical results. <br /> Each well will be allowed to recover to at least 80% of its pre-purge water level before <br /> sampling. The groundwater samples will be collected with clean, disposable bailers. Each water <br /> sample will be gently poured from the bailer to two (2) 40-m1 glass, volatile organic analyses (VOA) <br /> vials, and two (2) I-liter, amber glass bottles. Each container will be labeled for sample identification <br /> and placed in a cooler chilled with Blue Ice. Upon completion of the fieldwork, the water samples <br /> will be delivered under chain-of-custody procedures to GeoAnalytical Laboratories, Inc.. in Modesto, <br /> California. <br /> N� <br /> • CONDOR <br />