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11 September 1996 AGE Project No. 95-0108 ' Page 7 of 10 tape.The samples were placed in a chilled.container and transported under chain-of-custody to MAI and were'analyzed for TPH-d and BTE&X in accordance with'EPA methods 8015 and 8020. TPH-d was detected in three of the four soil samples at concentration as high as 21,000 ppm:(TPH-d, ' ' OX4-2). Benzene was detected in one sample at 0.43 ppm..The maximum conclentration of toluene was.0.74 ppm,of ethylbenzene was 1.0 ppm, and of total xylenes was 29 ppm..Analytical results of the soil samples,are summarized in Table 4. The laboratory results (MAI Lab ID.52051 to.52024)1 . and chain-of-custody form are included in Appendix O. , . 3.1.0. BACKFILL.IhG OF EXCAVATION In the summer of 1995 the excavation was backfilled with clean dirt to depth of appyoxii,iately four' feet below surface grade. Plastic sheeting was placed above the clean soil to act as'a vapor and-water barrier. Hydrocarbon-impacted soil from the previously stockpiled soil was then.used•.to=f ll the ' upper four feet. The back-fill.material-wa§ compacted. 3.11. SOIL STOCKPILE SAMPLING, MAY 1996 - On 08 May 1996, a representative of AGE sampled the remaining 1,500 cubic yards of hydrocarbon- , ' impacted.soil for disposal. The soil sampling locations are depicted in Figure 2.- The sampling was conducted under the supervision of the PHS-EHD. Fifteen discrete soil samples were coNected from. the soil stockpile on the northern portion of the site. An additional five soil samples were collected ' from the backfilled soil within the upperfour feet of the former USTs over-excavation. The soil- ` filled leading sample sleeve in the sampler was preserved for laboratory analysis. Birth ends of.the lead sleeve were covered with Teflon sheets, capped and sealed with tape. The samples were stored in a chilled container and transported under chain-of -custody to MAI. Selected samples were` analyzed for TPH-d and BTE&X in accordance with EPA methods 8015in and 8020, respectively.. . '' n of TPH-d; with a maximum Of the 20 soil samples,- 1$ contained detectable concentrations . concentration of 530. ppm. Total xylenes were detected in three samples, with a maximum ' concentration of 0.013 ppm. Benzene, toluene and ethylbenzene were,not detected in ariy of the 20 , samples. Analytical results of the soil samples are summarized in Table 4. The Iaboratory results, (MAI Lab ID 64881 to 64900) and chain-of-custody,form are included in Appendix P.