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06 October 1997 AGE-NC Project No. 96-0264 Page 4 of 5 4.0. FINDINGS 4.1. SURFACE SOIL SAMPLING Detectable concentrations of hydrocarbons were not present in the surface soil samples collected from the storm water runoff collection pond. 4.2. HYDROCARBON-IMPACTED SOIL .and TPH-g wer detected at concentrations _ au"50 parl_,per million (ppm, reported as milligrams per kilogram), respectively, in soil collected from probe boring 3 at a depth of 5 feet bsg(B3-5). Lower concentrations of toluene, ethylbenzene, and xylene were also detected in the same sample. Detectable concentrations of TPH-d, TPH-g or BTE&X were not present in the soil samples collected from boring 3 at a depth of 10 feet bsg. TPH-d was detected at a concentration of 1.6 ppm in the sample collected from boring 2 at a depth of 10 feet bsg, located at the discharge end the clarifier. Tetrachloroethylene(PCE) was detected at a concentration of 94 parts per billion (ppb, rept micrograms per kilogram) in the soil sample from boring 3 at 5 feet bsg (113-m. PCE was also le from boring 6 depth of 5 feet bsg(136-5) at a concentration of 45-0b. No other soil samples analyzed contained detectable concentrations of petroleum hydrocarbons or chlorinated hydrocarbons. Analytical results from the soil samples are summarized in Table 1 - Analytical Results of Soil Samples. The laboratory report (MAI Laboratory ID numbers 79955 through 79962 and 80081 and 79963 through 79968), chain-of-custody and QA/QC report are included in Appendix A. 5.0. SUMMARY AND CONCLUSIONS The following conclusions were drawn from the results of this investigation: • Ground water at the site was not encountered in the soil borings advanced to depths of approximately 10 feet bsg on the site. • Hydrocarbon-impacted soil was encountered near the receiving end of the three-stage clarifier. Soil was impacted at a depth of five feet bsg, near the bottom of the clarifier.