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} <br /> I <br /> complete suite of background water quality analyses will also be conducted for arsenic, mercury, <br /> fluoride, chloride, silver, sulfate, aluminum, copper, iron, manganese, zinc, and total dissolved <br /> solids. The samples will be collected after purging the wells of approximately 10 casing volumes <br /> of water. <br /> Using the data gathered from the ground water chemistry analysis, an evaluation of the potential <br /> effectiveness of adding oxygen to ground water to enhance the biodegradation of remaining <br /> adsorbed-phase hydrocarbons present below the water table will be conducted. Potential side <br /> effects of oxygen addition due to chemical factors, such as high dissolved iron or other metals <br /> with high chemical oxygen demand, will be considered. If oxygen appears to be a limiting factor <br /> in microbial population growth, dissolved-oxygen concentrations may be increased using an ORC. <br /> E One of the compounds being considered is manufactured by Regenesis Bioremediation Products, <br /> t located in Corona del Mar, California. This product is currently being used to enhance <br /> biodegradation of hydrocarbons at several locations in California by various environmental <br /> remediation firms. Appendix B contains a summary sheet provided by the manufacturer outlining <br /> the product and its function in detail. <br /> A status report on the feasibility of enhanced biodegradation as a remedial measure at the site <br /> will be issued to the County in the supplementary site assessment report. This report will contain <br /> pertinent ground water chemistry data and a summary of the likely effectiveness of insitu <br /> enhanced bioremediation in remediation of remaining adsorbed-phase and dissolved-phase <br /> hydrocarbons at the site. <br /> 4.7 SUPPLEMENTARY SITE ASSESSMENT REPORT <br /> A report on the supplementary site assessment activities and enhanced biodegradation feasibility <br /> evaluation will include boring logs, laboratory analysis results, well construction details, <br /> findings, and conclusions. Ground water monitoring and sampling reports will be issued on a <br /> quarterly basis and will contain official laboratory reports, chain of custody documentation and <br /> copies of the field purge data sheets. <br /> 5.0 WORK SCHEDULE <br /> Planned activities will be performed according to the following estimated completion schedule: <br /> • Expected agency approval of work plan by: December 15, 1994 <br /> • Drill borings/wells by: January 15, 1995 (pending permission for private property access). <br /> • Conduct baseline and background water quality sampling for enhanced biodegradation <br /> feasibility by: January 31, 1995 <br /> • Submit supplementary site assessment and enhanced biodegradation feasibility report by: <br /> March 15, 1995 <br /> • 6 <br />