SITE INFORMATION AND CORRESPONDENCE

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REVISED MONITORING AND REPORTING PROGRAM NO. 93-701 - 3 - GEWEKE LAND DEVELOPMENT AND MARKETING SAN JOAQUIN COUNTY SOIL SAMPLING Quarterly, one soil boring will be drilled near EW1 and three soil borings will be drilled in the concentrated inoculated area, which may also be described as the area bounded by the air blower system (See attached Figure 1). A minimum of four borings will be drilled each quarter. The initial round of borings will be approximately three feet from the inoculation points. Upon evidence of activity of the inoculated bacteria, the following round of soil borings will be drilled an additional three feet from the previous round of borings. Borings will be drilled with a hollow-stem auger drill rig. Drilling will consist of continuous coring with continuous detailed logs of the geological strata. Coring will extend to the surface of the water table. Soil samples will be collected for analysis beginning at the upper edge of the contaminated zone, at all changes in lithology, at the top of the capillary fringe, and just above the surface of the water table. Cone penetrometer technology may be used to replace soil borings where applicable. The Board shall be notified five days in advance of any drilling. With prior notification of the Board and adequate justification, selected samples, rather than all, may be approved for submittal to the laboratory for analyses. After several rounds of monitoring have been reviewed, the sampling schedule may be modified, at the discretion of the Board. Table 4: Sampling for Biological Activity in Soil Type of Sampling Sample Analytical Constituents Units Sample Freouency Location Method Purgeable Aromatic Organics mg/kg Driven Tube Quarterly Described Above EPA Method 8020 TPH as Gasoline mg/kg Driven Tube Quarterly Described Above LUFT Method GCFID Bacterial Composition Genera Driven Tube Quarterly Described Above Various Methods Bacterial Numbers cells/mg Driven Tube Quarterly Described Above Various Methods Nitrate mg/kg Driven Tube Quarterly Described Above TCLP/EPA 300 Nitrite mg/kg Driven Tube Quarterly Described Above TCLP/EPA 300 Phosphate mg/kg Driven Tube Quarterly Described Above TCLP/EPA 300 pH ---- Driven Tube Quarterly Described Above ---- REPORTING Existing monitoring locations are shown in Figure 1. Prior to construction, plans and specifications for soil borings, ground water monitoring, injection, and extraction wells, and air/vapor monitoring, injection, and extraction wells/points shall be submitted to Board staff for review and approval. Once appropriate permitting requirements have been met, the Board shall be notified five days prior to implementation of supplementary remedial activities, including addition of distilled water to soil to improve bacterial mobility, discharge of treated ground water to the surface or subsurface, and addition of nutrients, such as nitrogen and phosphorus, to the subsurface.