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a...:�°��-srrss�x�+g�r�rt!r-�� �LSw'y3Fi� • I i r..i 5.2 Laboratory Analysis - Soil Laboratory analysis of soil samples collected from the end of the middle diesel tank after rewest still -excavation of sails concentrations of trace levels of TEX ( <,018 ppm) . Low recorded in the 2.0 and ine 5 0 hydrocarbons sam<1es. ppm) were foot excavation sample recorded 30,6 A The 6.0 wall sample and the 16.0 floor sample pdid Tnot rcordbut e 2.0 TPHD above the 10,0 ppm detection limit. Laboratory for these samples are summarized in Table 1, test results The laboratory analysis the 15.0 20.0 25.0 and 30.0 samples from the well boring tWl did not record the presence Of above method detectil)n limits. The TPHD ions ranged from <1.0 ppm (at concentrations.ft) to 4.1 ppm (at 30.0 ft). Chlorinated hydrocarbons and semivolitile organics (including PCB's) were not detected in the samples Metals concentrations ranged from <0.5 ppm tested. ppm r. (Zn) , „aboratory test (Cd) to Sresults for these samples are summarized in Tables 2 and 3. Laboratory analysis of samples from the angle sail boring ASBI did not record the presence of BTEX, TPHD, chlorinated hydrocarbons (8010) or semi volatile organics (8270 constituents above method detection limits. The 17.5 foot sample recorded 40 ppm of oil and grease but the 25.5 foot samples were below ppm methal detection 10.0 and the 20 limit, The metals Cd Cr Pb and Zn recorded concentrations ranging from <0.5 to 54,8 ppm, Laboratory test results for these samples are summariZLd in Tables 2 and 3. 5.3 Laboratory Analysis - Groundwater The laboratory analysis of two groundwater samples collected from well MW1 did not record the presence of BTEX above the 0. 7 ppb method detection limit. The concentration of TPHD, V chlorinated hydrocarbons (8010) and semi volatile organics (8270) constituents were all below method detection limits. Metals concentrations ranged from <I.0 (Zn). The TPH-D concentration was recordedmat(Cd) to 271 ppm - b and 59 ppb in the two samplings. The laboratory directorpindicated that these, concentrations represented a single constituent, as opposed to a range of diesel hydrocarbon constituents, based on the chromatogragh. These levels were reported as diesel hydrocarbons because the constituents peak occurred within the diesel hydrocarbon range. Concentrations of test results for these sampling are summarized in Table 4. ;ro 6.0 CUNCLUSIONS The removal of the three 10000 gallon diesel tanks and associated product lines has eliminated the primary source of subsurface hydrocarbon contamination in this area. The 6