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171-90 <br /> w FIELD INVESTIGATION <br /> The field Investigaticn consisted of drilling, logging, and sampling three (3) testhole <br /> i <br /> borings. The three borings were drilled on January 21, 1991, and were positioned to <br /> rte+ <br /> determine the presence and extent of petroleum constituents In the soll and groundwater <br /> PA associated with three (3) 10,000 gallon underground gasoline fuel tanks and dispensers <br /> I (FIGURE 3). <br /> ' ka <br /> ES <br /> Monitoring Well MW1 was drilled in the approximately 30 feet north of the removed <br /> h� <br /> s underground fuel tanks cluster, and Is the up t—uwnl well at the site. Monitoring well <br /> MW2 was drilled approximately 43 feet norihwesterly of the former fuel tanks location. <br /> 1 ` Monitoring Well MW3 was drilled In the vicinity of the southeast corner of the site near <br /> !' the former fuel tanks. <br /> �.i <br /> Monitoring Well MW1 through MW3 were drilled to a depth of 25 feet below the ground <br /> surface. Soil samples were collected at 5 foot intervals starting at 5 feel below the <br /> j ground surface. Sampling was terminated at a depth of 21.5 feel below the ground <br /> r surface <br /> The HNU 101 Photolonizatlon Meter registered measurable levels of Total Petroleum <br /> Hydrocarbons In Monitoring ..:Ils MW1 and MW3 (APPENDIX A). The highest level <br /> << of paircleum constituents measured by the HNU 101 Phololonization Meter was 40 ppm <br /> in Monitoring Well MW1. Generally, the levels Increased with depth in the soil above <br /> the water table. Strong to moderate petroleum odors were detected in all of the <br /> , 3 <br /> monlioring wells, generally Increasing with depth. <br /> 7 <br />