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1 <br /> Mr. Renaldo Crooks 2 May 28, 1986 <br /> To eliminate the introduction of contamination from other sources, all <br /> t equipment for drilling and the well screen and casing were steam-cleaned <br /> prior to use. The brass tubes used for collecting the soil samples and <br /> glass vials for water samples were provided by Canonie's laboratory in <br /> ' Stockton and were cleaned and dried prior to use. <br /> Location <br /> ' The well , MW-1, was located approximately 30 feet north of the sidewalk <br /> paralleling Alameda Street and approximately 15 feet east of the <br /> sidewalk paralleling North Main Street. The location of the well is <br /> ' shown on Figure 1. This location was close to the center of the <br /> location of the three underground storage tanks which were removed in <br /> 1985. The location of the tanks was verified by personnel from Precision <br /> Industries, Inc. , the company responsible for removing the tanks. <br /> Drilling and Soil Sampling <br /> t The borehole was drilled with a 6-inch hollow stem auger to a depth of <br /> 45 feet. This depth was estimated to be 20 feet below the lowest water <br /> level recorded on the maps produced by the San Joaquin Flood Control <br /> ' District for the years 1979 through the spring of 1985. The existing <br /> depth to water was about 15.5 feet. <br /> ' Soil samples were collected between the depths of 13 and 17.5 feet. The <br /> samples were acquired, preserved, and transported in accordance with EPA <br /> Manual SW 846. The upper limit of the sampling was determined by the <br /> depth to the bottoms of the storage tanks and the lower limit by the <br /> ' depth to water. Samples were not collected above the depth of 13 feet, <br /> because they would represent only the fill material brought in to <br /> backfill the excavation. <br /> ' Two sets of samples were collected below the top of water in order to <br /> sample the soils immediately beneath the bottom of the tanks. However, <br /> due to difficulties with removing the sampler from the borehole, only one <br /> sample, from 14.5 to 16.0 feet, was retained and submitted to the <br /> laboratory for analysis. <br /> No field testing for evidence of hydrocarbon products was conducted on <br /> the soil samples at the time they were collected. Field testing was <br /> considered unnecessary because all samples exhibited a very strong <br /> ' gasoline odor that could be easily detected without the aid of <br /> instrumentation. <br /> CanonteEngineers <br />