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, <br /> r F <br /> 1 <br /> 21 April 2000 <br /> AGE-NC Project No 95-0144 <br /> Page 4 of 5 <br /> ' 313 ANALYTICAL RESULTS OF BIOLOGICAL ANALYSES <br /> Analysis of the samples collected from wells MW-21A and MW-21B indicate nutrient <br /> concentrations suitable for microbial activity and degradation of hydocarbons Hydrocarbon- <br /> degrading microbial activity was indicated for the sample collected from MW-21 B, screened below <br /> the clay layer at the site However,hydrocarbon-degraders were not obsen,ed to the sample collected <br /> �I from MW-21 A,screened in first ground water The laboratory report(A Keith Kaufman report dated <br /> February 25, 2000) and chain-of=custody form are included in Appendix C <br /> 4.0. SUMMARYICONCLUSIONS <br /> Based upon data collected from the site, AGE concludes <br /> * Ground water elevation;ncreased approximately 0 5 feet at the site since the previous ground <br /> water monitoring event Ground water remained above the screened interval in nine of the <br /> shallow wells sampled during the ,current quarter Ground water elevations in wells <br /> completed beneath the clay layer were lower than to wells completed within first ground <br /> water <br /> • <br /> Petroleum hydrocarbons were detected in seven of the fifteen wells sampled during the <br /> February 2000 monitoring event Overall, concentrations of hydrocarbons have generally <br /> remained stable or decreased at the site between November 1999 and February 2000 <br /> • The shift in hydrocarbon concentrations from MW-21 to MW-20, observed during the <br /> November 1999 sampling event reverted to the previous pattern during the February 2000 <br /> sampling event It is possible that the samples had been mislabeled or switched during the <br /> November 1999 sampling event <br /> • MTBE was detected in sample MW-21B at a concentration of 6 0 ppb MTBE was not <br /> detected in the remaining fourteen wells sampled during the February 2000 monitoring event <br /> • Nutrient concentrations detected in the samples collected from MW-21A and MW-21B <br /> appear to be suitable for microbiological degradation of hydrocarbons <br /> i <br /> Bioenumeration analyses indicate that microbial degradation of hydrocarbons in ground <br /> water below the clay layer is occurring However, degradation does not appear to be <br /> occurring in the uppermost ground water <br /> Adimeced GwEnt irenmcntal Inc <br /> , <br />