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WORK PLAN FOR MODIFICATIONS TO BIOREMEDIATION <br /> OF SOIL AND GROUND WATER <br /> Geweke Land Development and Marketing <br /> 16 South Cherokee Lane, Lodi, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Geweke Land Development and Marketing (GLDM),Advanced <br /> GeoEnvironmental, Inc. (AGE)has prepared this Work Plan addressing the on-going bioremediaiton <br /> project at 16 South Cherokee Lane in Lodi, California. The Work Plan includes procedures for <br /> installation of one additional ground water monitoring well, addition of nutrients to the subsurface <br /> and modifications to the existing monitoring plan. A plans of the site are illustrated in Attachment <br /> A. <br /> The Work Plan is prepared in response to a meeting with the Central Valley Regional Water Quality <br /> Control Board (CVRWQCB) on 27 October 1995 and a letter dated 28 November 1995. <br /> 2.0. BACKGROUND <br /> 2.1. IN-SITU REMEDIATION OF SOIL AND GROUND WATER <br /> A pilot study for in-situ bioremediation of soil and ground water at the site was initiated in February <br /> 1994. The duration of the pilot study was approximately two months. Full-scale remediation of the <br /> subject site has been on-going since August 1994. Both soil and ground water were treated by the <br /> addition of hydrocarbon-degrading bacteria to the subsurface. Soil, ground water and vapor <br /> monitoring has been performed at the site since August 1994. The pilot study, full-scale remediation <br /> and monitoring were initiated by Geological Audit Services, Inc. (GAS). <br /> AGE was retained in April 1995 to continue monitoring and evaluate the progress of the soil and <br /> ground water remediation. Results of monitoring activities and a summary of bioremediation <br /> progress are reported four times each year in Quarterly Reports. <br /> 2.2. REMEDIATION PROGRESS <br /> In the Final Remediation Plan prepared by GAS, the estimated remediation period for treatment of <br /> the impacted soil was one to two years; the estimated treatment period for ground water was six <br /> months to one year. Based upon the initiation of full-scale inoculation in August 1995, remediation <br /> of impacted soil has proceeded on or ahead of projected time-lines. However, the progress of ground <br /> water remediation has been slower than projected. <br /> Included in Attachment A is a figure showing benzene concentrations in ground water prior to <br />