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0 0 Regenesis internet site at http://www.regenesis.com). At the McMullin site we propose to inject ORC manufactured by Regenesis® both in the saturated zone and in the unsaturated zone to enhance aerobic biodegradation of the petroleum hydrocarbons and achieve source reduction (See Figure 2 for a conceptual layout of the remedy). Regenesis® ORC is composed of magnesium peroxide (MgO2). When M902 reacts with water, oxygen is released and the M902 converts to a Mg(OH)2 (i.e., milk of magnesia) cement. The released oxygen is used by existing aerobic petroleum degrading bacteria to biodegrade the petroleum hydrocarbons present in the subsurface. Regenesis® claims that their ORC product is not toxic and is environmentally safe (See Technical Bulletins and MSDS in Appendix Q. PURPOSE The purpose of this workplan is to provide a methodology for applying an ORC injection strategy to this site, and for monitoring the effectiveness of the technology at degrading petroleum hydrocarbons in the unsaturated and saturated zones. The workplan includes a description of the proposed ORC remediation system (including the location of the ORC injection points), a monitoring plan, a description of the proposed project report format, and an implementation schedule. Field methods proposed are detailed in Appendix A. A Health and Safety Plan prepared for the field work proposed in this workplan is included in Appendix B. BACKGROUND Three previous site investigations have been performed at the McMullin Gas Dehydrator Station (Figure 3). The earliest site investigation was performed in November 1992 and consisted of drilling and sampling nine soil borings (MC -B 1 through MC -B9) within and adjacent to the gas dehydrator station facility (PG&E 1993). Soil samples were collected and analyzed for petroleum hydrocarbons and BTEX compounds; groundwater samples were not collected. In April 1997, four additional soil borings (19-B1 through 19-B4) were advanced and sampled within the boundaries of the site and soil and groundwater samples were collected from each borehole (HLA 1997). The borings were drilled adjacent to equipment where there was a potential for chemical releases. The purpose of the April 1997 assessment was to determine if soil and/or groundwater was impacted at the site. The most recent site investigation, performed in November and December of 1997, included drilling and sampling 8 soil borings within the site and on adjacent properties (B-6 through B-13), and installing four groundwater piezometers (PZ -1 through PZ4) and four groundwater monitoring wells (MW -1 through MW -4) (CH2M Hill, personal 402 331-98 63.doc 1-3