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1 <br /> CLEARWATER <br /> G R O U P, I ISI C <br /> the site In the northwestern � e g ortnon of the site the gradient appears to flatten to <br /> P <br /> approximately 0 3% Water level data are included on Table 2, and Figure 3 presents <br /> the groundwater contour map o03 <br /> 3.5 Groundwater Sample Analytical, Results <br /> Analysis of TPHg and BTEX in groundwater samples indicate that no hydrocarbons <br /> ' were detected in samples from monitoring wells MW-3, MW-4, and MW-6 TPHg <br /> concentrations in the remaining three wells ranged from 110 parts per billion (ppb) <br /> to 49,000 ppb, benzene concentrations ranged from 56 ppb to 470 ppb The highest <br /> I concentrations were detected in the groundwater sample from MW-2 The sample <br /> from MW-2 was also analyzed for MTBE, but none was detected <br /> ' Table 2 includes the results of groundwater analyses for the third quarter sampling <br /> event, and Figure 4 presents the distribution of dissolved hydrocarbons in <br /> groundwater <br /> 3.6 Results of Soil Vapor Extraction and Air Sparge Pilot Test <br /> ' <br /> Soil Vapor Extraction Pilot Test <br /> I I I <br /> IVacuums were measured it the SVE wells, located approximately 35 feet apart, and <br /> in monitoring wells MW-4, MW-5, and MW-6 (located 39 to 118 feet from the SVE <br /> ' wells). Table 3 summarizes the laboratory data obtained from the analyses of air <br /> samples Appendices E and F contain the field data sheets and laboratory reports`of <br /> air analyses, respectively. <br /> r , <br /> ' ! 5 <br /> Vacuums were applied to each SVE well in steps of 10, 30, and 50-60 inches of water <br /> (itches) for approximately one hour per step Air flow at 10 and 30 inches vacuum <br /> was approximately 3 ACFM and 6-8 ACFM, respectively Significant vacuums were <br /> not induced m monitoring wells or the other SVE well during step tests conducted <br /> ,at, applied vacuums of 10,and 30 inches of water The following is a summary of the <br /> 4 l I''results of SVE tests in VW-1 and VW-2 at vacuums of 50-60 Inches: I <br /> I";'VW-1 (at!601 itches vacuum): II <br /> ll I. I as IW1loAEslight vacuum' (0'35'nnches) w , cated'351feefianvay Ir <br /> I I II"I I I l <br /> ' I i',diol PAR/3Q/P1LOT,,,I II <br /> ISI ! 1 i I+ ,I E III,I l!I <br /> I�f t f`k`{ I� 1 I <br /> I! I Illll I�'I 1 Ifll l I� Il I Il 'Il fill fll �I�� , r <br /> I'I I li I I 11 !1 r i I I I I Il I I <br /> I"'Ir1I1Fill l4 n', I I IE I I�pI"I I�I I 'VIII +II'I I�al��l rr a 111 III iIIIII I'I' I III I• llhlll!�II Ill III `��IIF l II I II <br /> Tit IL1+41;jE <br /> ��, <br /> a 1 <br />