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• <br />supply and is not included in the more stringent RAC I designation. RAC [I levels have <br />been determined appropriate by the State of Colorado with regard to a separate storage tank <br />closure at the SWPC site. For [he proposes of the AST-system closure, the use of RAC Il <br />guidelines is appropriate. <br />Cleanup guidelines for RAC [I soil aze 50 mg/kg for BTEX and 250 mg/kg far TEPH. <br />Cleanup levels for groundwater are defined by the State of Colorado in ~ CCR 1002-8. The <br />standards define cleanup levels for benzene, toluene, ethylbenzene, and total xylenes at <br />0.005, 1.0, 0.680, and l0 mg/L, respectively. Cleanup levels have not been established for <br />TEPH concentrations in groundwater. <br />.3.2 Soi! Sample Annlylien! Results <br />Laboratory results for soil samples submitted for analysis indicate the presence of TEPH in <br />concentrations ranging from 61 milligrams per kilogram (mg/kg) for sample SH-1:2.5 to <br />2,900 mg/I:g for sample BH-10:1-3. "The presence of TEPH was not indicated above the <br />laboratory detection limit of 20 mglkg in soil samples BH-11:]-] and BH-12:1-3. <br />Analytical results for the soil samples indicate the presence of low concentrations of toluene <br />in sample SH-2:2.5, ethylbcnzene in samples SH-1:2.5 and SFI-22.5; and xylene in samples <br />SEI-1:2.5, Sl [-2:2.5, and BH-16:1-3. No BTEX constituents were indicated at <br />concentrations above the laboratory detection limit in the remaining five soil samples. <br />Benzene was not indicated above the laboratory detection limit of 0.005 mg/kg in any of the <br />soil samples analyzed. A copy of the laboratory soil sample analytical report is attached as <br />Appendix C. Analytical results for the soil samples arc summarized below in Table 2. <br />TABLE 2 <br />SUMMARY OF SOIL SAMPLE ANALYTICAL RESULTS <br />Sample TEPH Benzene Toluene Ethylbenzene Xylene <br />SFI-1:2.5 61 <0.002 U <0.002 U 0.0021 0.0041 <br />SH-2:2.5 690 < O.OOI U 0.010 0.076 0.27 <br />BH-]0:1-3 2,900 <0.002 U <0.002 U 0.030 0.052 <br />BH-11:1-2 <20 U <0.002 U <0.002 U <0.002 U <0.002 U <br />BH-12: l -3 < 20 U < 0.002 U < 0.002 U < 0.002 U < 0.002 U <br />BH- l 3:1-3 180 < 0.002 U < 0.002 U < 0.002 U < 0.002 U <br />BH-14:1-2 380 < 0.002 U < 0.002 U < 0.002 U < 0.002 U <br />BH-16:1-3 420 < 0.002 U < 0.002 U < 0.002 U 0.051 <br />RAC II Limit 250 50 Total BTTX <br />Notes: Reported values in me/kg <br />U = analyte undetected <br />3.3 GrorrndtvnterSampleAnalylrcalResulls <br />Laboratory results for groundwater samples submitted for analysis indicate the presence of <br />TEPH in concentrations ranging from 2.0 milligrams per liter (mg/L,) for samples SH-1 and <br />ERM-ROCKY MOUNTAIN, INL'. <br />P:\I OOOIS WPC\9610I9ViEPORT.nOC Printed on Recycled Paper <br />6 <br />