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—ys _ amu¢- ,yr-. -$ � X "7 Y�' ���•�XT � �rn ���'f � � � yir.�i �.1 :� <br /> 4,0 RESULTS OF INVESTIGATION <br /> 4.1 Sails <br /> Photoionization detector readings (PID) (Table 3) were taken at <br /> five foot intervals during the drilling of MW1, MW2, MW3, SBI, <br /> and S32 indicates organic vapors in the soils of MW3 MW2, SB1, and <br /> SB2. These readings, with the exception of MW3, generally indi- <br /> leum <br /> ucarbons are <br /> cate the highest levels of <br /> approximately 15 fete and othe water er present <br /> table at 25 27feet. <br /> Soils encountered were generally silt with sand to 35 feet below <br /> grade with a layer of clay between the surface fill and 5 feet. <br /> Lean clay was found from 36-38 feet below grade to the bottom of , <br /> the borings at approximately 46 feet. <br /> a Discoloration was noted in the soils found at the capillary <br /> and <br /> fringe (approximately 25 feet below grade) of wells MW3, , <br /> MW7. <br /> Moderate hydrocarbon odor was noted from 15 to 30 feet below <br /> grade in MW1 and MW2. Stronger odors were noted from 10 feet to <br /> 45 feet below grade in MW3 and from 15 to 20 feet in MW6. No <br /> odor was noted during the drilling of MW4, MW5, and MW7. In soil <br /> borings SB1 and SB2 moderate product odors were noted from 15 to <br /> 21.5 feet below grade. <br /> During the drilling of monitor wells one through seven (MW1, MW2, <br /> MW3, MW4, MW5, MW6, and MW7) and soil borings one and two (SBI, <br /> SB2) samples were collected for analysis at 15 and 20 feet <br /> (approximately) below grade. Samples were analyzed for BTEX and <br /> TPHG using 8015/8020 methodologies. Samples from the initial <br /> wells WW1, MW2, and MW3) were also analyzed for oil and grease <br /> using EPA 503D and E methodologies. Because oil and grease <br /> constituents were not detected, the soil samples collected <br /> during <br /> ithe <br /> s o e <br /> re not ed <br /> Laboratory analysis datais containedz <br /> foroland greasein <br /> Appendix III. <br /> Soil contamination apparently extends laterally from Tank Pit A <br /> toward MW2, and from Tank Pit B toward MW6 and MW7. No hydrocar- <br /> bon constituents were detected in the soils of monitoring wells <br /> MW4 and MW5. The highest levels of hydrocarbon constituents in <br /> soil were found in MW3 which is the only well exhibiting free <br /> product. <br /> 4,2 Groundwater <br /> Groundwater from MWl and MW2 was analyzed for BTEX, TPHG and oil <br /> and grease. Groundwater from monitor well MW3 was not sampled <br /> due to the presence of free product in the well. Samples col- <br /> ----- -- --lected_from_wells-_MW4, MW5, MW6, and MW7 were analyzed for BTEX <br /> and TPHG. <br /> 4 <br /> _ ,: r <br />