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1 <br /> Mr Tim Cuellar <br />' Pacific Pride - Westlane <br /> June 22, 2000 <br />' Page 2 <br />' COMMENT <br /> I The data from these analyses reveal that the sample contains moderately high concentrations <br /> of both general (heterotrophic) and selective (MTBE-specific) microorganisms These results <br /> suggest a lengthy exposure of the microbial population to the target contaminants, and/or the <br />' presence of a comparatively low concentration of alternative (competitive) carbon substrates <br /> The results are also consistent with physicochemical health of the soil, with all parameters <br /> indicated as being within the acceptable range for microbial health and biodegradative <br />' metabolism <br /> The combined results support the belief that natural bioattenuation is occurring in the soils <br />' represented by the tested sample, such activity will likely continue unless and until one or <br /> more of the following conditions occur <br />' a Bionutrient Exhaustion <br /> b PhysicocheMLcal Upset (e g change to pH, biotoxins introduced) <br /> c Carbon Exhaustion <br />' It is suggested that periodic sampling and microbiological/physicochemical analyses be <br /> performed on a quarterly (minimum) basis to ensure subsurface conditions remain compatible <br />' with ongoing biodegradative activity against the target compound <br /> Should you have any questions concerning these results, please do not hesitate to contact me <br /> AKK em <br /> I <br /> �I <br />