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I <br /> 1 Mr. Renaldo Crooks 3 May 28, 1986 <br /> Well Comoletion Details <br /> The final completion details for the monitoring well are shown in Figure <br /> 2. Please note that the screen and casing assembly were installed to a <br /> depth of 25 feet rather than to 45 feet as was originally intended. The <br /> saturated gray sand exhibited "quick conditions" and backfilled the hole <br /> so quickly that only 25 feet of casing could be installed. Several <br /> attempts were made to install the casing to greater depth. The only <br /> alternative would have been to keep the hollow stem full of water while <br /> the casing was installed and the auger removed. However, charging the <br /> well with a volume of water could have distorted the results of the water <br /> quality analyses. <br /> After the well was completed, the well was bailed to remove the sediment <br /> that entered the screen during installation. The well was bailed dry <br /> four times on April 8, 9, and again on the 11th prior to collecting the <br /> water samples. All three times that the well was purged, the water <br /> exhibited a very strong gasoline odor. <br /> Ground Water Sampling <br /> One ground water sample was collected for laboratory analysis on April <br /> 11, 1986. The well was first bailed dry four times, and then allowed to <br /> recover for about one-half hour before collecting the sample. To prevent <br /> introduction of contaminants from other sources, the bailer was steam <br /> cleaned prior to purging and sample collection. A portion of the sample <br /> water was placed in a graduated cylinder to check for free floating <br /> product. A 0.10-inch-thick layer of free floating product was identified <br /> on the surface of the water. The sample vials for laboratory analysis <br /> were acquired, preserved, and transported in accordance with EPA Manual <br /> SW 846. <br /> Results of Laboratory Analysis <br /> One sample each of soil and water were submitted to the laboratory for <br /> analysis. The samples of soil and water were analyzed for five <br /> constituents indicative of gasoline contamination. The method of <br /> analysis for benzene, toluene, xylene, total hydrocarbons, other volatile <br /> hydrocarbons, and ethylene dybromide (anti-knock additive) was EPA Method <br /> 8020 outlined in the EPA Manual SW 846. The EPA method used for lead was <br /> 7421, outlined in the EPA Manual SW 846. The results of the analyses are <br /> listed in Table 1. <br /> I <br /> I <br /> CanonteEngineers <br />