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J. H. KLEINFELDER & ASSOCOTES <br />•` <br />File No. W-2008-1 <br />November 14, 1985 <br />Page 2 <br />III. PURPOSE <br />The purpose of this investigation was to assess whether gasoline products have <br />impacted the local soil and/or ground water quality. To this end, one soil boring was <br />placed over the site of the removed storage tank and was completed as a monitoring <br />well. During drilling, a Kleinfelder geologist classified the subsurface soils; collected <br />the soil samples for subsequent analyses; screened samples in the field for semi -volatile <br />hydrocarbons with a portable photoionization detector (PID), and logged the bore hole. <br />IV. FIELD ACTIVITIES/OBSERVATIONS <br />A. Soil Borings. <br />The location of the soil boring and the monitoring well installed in the same <br />borehole is shown on Plate IL The borehole was drilled using a truck mounted <br />mobile B-45 drill rig equipped with 6 -inch hollow stem augers. The soils <br />encountered during drilling consisted predominately of interbeds of sand and silty <br />sand with some clayey sand. A description of the soils encountered is presented <br />on Plate IV, the copy of the Unified Soils Classification System (used to identify <br />the soil) is included as Plate III. Ground water was encountered 47 feet below <br />grade in clayey sand. All sampling equipment used during the investigation was <br />thoroughly cleaned prior to each use to minimize cross contamination. <br />B. Monitoring Well. <br />A groundwater monitoring well (MW -1) was installed in the borehole at the <br />completion of drilling and logging. The ground water well was completed with a <br />2 -inch inside diameter flush threaded PVC pipe, with well screen sections <br />perforated with 0.020 inch slots from 35 to 65 feet below the ground surface. <br />The annular space was backfilled with #2 Monterey sand to approximately one <br />�J <br />