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' Mr Tim Cuellar (AGE) <br /> Rain Water Car Wash <br /> July 24, 2000 <br /> Page 2 <br /> C MMENT <br /> ' The data from these analyses indicate a high and nonlimiting level of bionutrients which are <br /> presently available to support microbial metabolic activity The levels are high enough <br /> ' (especially with respect to nitrate and potassium) to exert modest growth inhibition due to <br /> nutrient-induced biotoxicity, however, such growth inhibition is not acutely pronounced The <br /> data indicate that there are both general and MTBE-selective microbial subpopuiations in these <br /> soils, suggesting that a moderate degree of natural MTBE bfoattenuation is occurring at <br /> present It is recommended that bionutrient levels and microbial population dynamics be <br /> monitored on a quarterly basis (minimum) to ensure maintenance of adequate <br /> ' microenvironmental conditions to support continued b+oattenuation over time <br /> Should you have any questions concerning these results, please do not hesitate to contact me <br /> ' AKK em <br />