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San Joaquin County EHD-PHS Bioremediation Workplan June 26,1995 Page 2 Sample Results The results of samples taken on June 15, 1995 show that sample TK3-South had Highly elevated levels of Gasoline and Xylenes, 3,900 ppm and 540,000 ppb respectively with no presence of Benzene. The excavated material that was removed, sample SP-3 South, also showed highly elevated levels of Gasoline and Xylenes, 3,400 ppm and 410,000 ppb, respectively with no presence of Benzene. The other soil samples obtained from excavation showed very low levels of Gasoline or Xylenes, sample TK3-Center; Gasoline was non detect and Xylenes were 6.2 ppb, sample TK3-North; Gasoline was 8.3 ppm and Xylenes were 130 ppb. The elevated levels in TK3-North may be caused by the fill on the tank which was located on the north end of UST. (see appendix A) Overeacavation On June 28, 1995 Fisch Environmental implemented the work plan submitted to San Joaquin County (EHD-PHS). This work plan consisted of excavating to a depth of 27 feet. During the excavation Fisch Environmental screened samples using a(FID). The FID showed higher concentrations as the excavation proceeded deeper, at that time the over excavation was halted due to the extent of contamination. The excavation was sampled at that time, the results are presented in (appendix B). Proposed Bioremediation Process Fisch Environmental Construction's process consist of cultivated naturally occurring microbes and enzymes, nutrients and water(biosolution). The Fisch Environmental's process is capable of promoting and maintaining predominantly aerobic metabolism for the remediation of petroleum hydrocarbons. Water is used for a homogenous application and serves as the transport mechanism of the treatment. The process does not require exogenous oxygen supplementation to promote aerobic metabolism, therefore tilling or turning of the soil becomes unnecessary.