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9�. ���? '� .,#, K�'„'� �� .+ rex y � � s ^� r � - a•. �� ,�r � -a <br /> r 111 <br /> t <br /> located using the addresses given in the well records. Some of the wells noted are probably <br /> r inactive, and other wells may exist in the vicinity but do not appear in the records. <br /> 5.0 PREVIOUS WORK <br /> A limited environmental investigation was conducted by Applied GeoSystems from June 6 <br /> through 8, 1990,near the existing underground storage tanks and in the proposed new tank <br /> i <br /> - cavity. The purpose of this investigation was to evaluate the extent of gasoline hydroc<rbons ! <br /> prior to planned tank replacement. The scope included drilling five soil borings and soil <br /> R; t <br /> sampling and analysis. Locations of the soil borings are shown on Figure 2. The results of <br /> laboratory analyses of soil samples collected during the drilling are presented on Table 2. <br /> Applied GeoSystems Limited Environmental Investigation report dated July 16, 1990 is <br /> included in this Work Plan as Appendix A. <br /> PM <br /> .,, <br /> 1 In the area near the existing underground storage tanks,hydrocarbons were detected to 45 <br /> feet in boring B-1, 20 feet in boring B-2, and 10 feet in boring B-3. Laboratory.results of <br /> w samples collected from these intervals indicate total petroleum hydrocarbons as gasoline <br /> r <br /> (TPHg) from 49 to 1,900 parts per million (ppm). Concentrations of benzene, toluene, <br /> ethyibenzene, and total xylene isomers (BTEX) ranged from below detection limits to 150 <br /> ppm. In the area of the propose-1 nev tank cavity, hydrocarbons were only detected in the <br /> samples collected from 15 and 20 feet below grade from borings B-4 and B-5 (42 to 810 <br /> ppm of TPHg). <br /> _. 4 Doc #AR06767;V I.I <br />