SITE INFORMATION AND CORRESPONDENCE

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I obtain these essential materials elsewhere. To preclude nutrient deficiencies, macro- and micro-nutrients will be � carefully monitored and supplied appropriately via a metering pump system. In addition to the above, two interesting processes can, and probably most often do , occur in the degradation of petroleum hydrocarbons . These are sparing and co- oxidation. Acetate, an intermediate product in hydrocarbon biodegradation, has been found to reduce the utilization of hexadecane . The basis for this sparing effect is not well defined, but it certainly occurs for other hydrocarbons , as well . Co-oxidation is a process in which compounds which , otherwise would not be degraded can be attacked by enzymes due to the abilities of: the individual microorganisms producing the enzymes to utilize other hydrocarbons within the petroleum mixture. The complexities of petroleum compounds provide an excellent chemical environment in which co-oxidation can occur , and many complex branched and cyclic hydrocarbons are. degraded as a result . It has been found, for instance, that the degradation of hydrocarbons within a gasoline mixture occur at a rate different from the degradation of individual compounds comprising the mixture . Phenomena such as these do not alter the metabolic pathways of degradation, but determine whether the enzymes necessary for metabolic attack on a particular hydrocarbon are active, . or even produced. Metabolic rates of system biomass will be monitored, as necessary , to ensure the system is sufficiently active to remediate contaminants in a timely manner . Following treatment , remediated water will be discharged to Lfhe sanitary sewer under the authority of a permit issued or this purpose. Fuel hydrocarbons sorbed onto, soil particles in the saturated zone will also be remediated using this technology through the dynamics of equilibrium stoichiometry. A schematic of the biareactor system proposed for the site will be submitted by June 1, 1994 . In order to provide contaminated water to the bioreactor system, EPM proposes to construct a 4-inch diameter groundwater extraction well approximately 10 feet north of the northwest corner of the on-site building. It is proposed that the well penetrate the water table 3 to 4 feet in order to target the LNAPL contaminants of concern at the site and avoid the extraction of large volumes of uncontaminated water from deeper, more permeable soils. The rate of water extraction is expected to be no less than 2 .5 gallons per minute. . . a rate sufficient to create a draw �' Page 10