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f <br /> { <br /> TABLE 4 <br /> C Crohn lw:iter Analytical Res1111s;Slinin ary <br /> :, I.. :.�:,Y.: '.,:„:4 I1,....I..S1.: . . .1 �'...-1... 1 'i:vi1s o:1 101, is l 1'' rllil <br /> J4`J f 779 S. Airpurt May, 5tucktull,,'(:uiilurtyia <br /> j Location ID Benzene Toluene Ethylbenzene Xylene TPH-D TPH-G <br /> ug/L PgIL µg/L jAglL mglL mglL <br /> 1114-Ow ND ND ND I'ND 0.88 ND <br /> HP2-GW ND 5.0 ND 12.6 1.3 ND <br /> MW-1 ND ND ND I,�ND ND <br /> MW-2 Nb ND ND i[ND ND_ <br /> MW-3 ND ND ND j;ND ND <br /> MW-5 (rinse ND ND ND `ND <br /> blank) <br /> i. <br /> ND = Not detected <br /> = Sample not analyzed for this parameter <br /> 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 1 , <br /> As shown in Table 3, low concentrations of TPH-D, ranging between 2.1 and 11.0 mg/Kg, were <br /> found in all soil samples taken from soil borings SB-1 and SB4 which bracket the area of the <br /> former spray oil tanks and the subsequent 1987 remedial excavation. As noted in Section 1.1 <br /> of this report, concentrations of up to 5,500 mg/Kg. were found in this area prior to completion <br /> of the remedial excavation. No BTEX compounds were quantified in soil samples taken during <br /> the remedial work nor were they found by this investigation. While the low TPH-D <br /> concentrations found in the soil boring samples extend to just above the current water table, no <br /> TPH-D concentrations (as summarized in Table 4) were found in!groundwater samples collected <br /> from the three monitor wells located to surround this areak <br /> Due to the total lack of BTEX concentrations in soil and (groundwater within this area and the <br /> demonstrated success of the 1987 remedial excavation in removing the vast majority of the <br /> extractable hydrocarbons (TPH-D) from the former tank area, WESTON recommends no further <br /> action be pursued for this area of the site. Furthermore, given the high cost that would be <br /> involved in pursuing the minimal TPH-D concentrations remaining in the soil at the fringe of <br /> the previously excavated area and the demonstrated lackll,'of groundwater impacts, WESTON <br /> recommends that -the site proceed into formal closure. <br /> jJ <br /> �i0t`Ill�l' fl:�tilllltl Ihtl> !tE� 'I'Itl} 1 tix alt�l�t! is soil l�ctrin`�g H1'-l nu further work is also <br /> Cl <br /> t,. recommended. Soil samples, collected from the boring at 8 and 12 feet below grade, did not <br /> show the presence of either TPH-D or TPH-G. The groundwater sample collected from the <br /> } boring via the Hydropunch tool also did not show any quantifiable concentrations of BTEX or <br /> TPH-G compounds. Although TPH-D was found at a very low concentration of 0.88 mg/L in <br /> the groundwater sample, this finding does not appear to be related to the historical use of <br /> t <br /> Tank 3. <br /> s <br /> r{( 3 <br />